TWI747703B - Charge and discharge control system and method thereof - Google Patents

Abstract

A charge and discharge control system and a charge and discharge control method are provided. The method mainly use a measurement module to measure the real-time grid frequency of a grid and the actual net output power of a power regulation system, and then use a grid frequency status determine module and a service performance measurement determine module further obtains a corresponding reference frequency band and a service performance measurement index, and uses a capacity interval determine module to judge the capacity interval corresponding to the capacity system of the capacity system, and then according to the reference frequency band, service performance index and capacity of charge and discharge response modes are defined by the power interval, so that the power conditioning system can be controlled according to the corresponding charge and discharge response mode, so that the power conditioning system controls the charge and discharge between the storage system and the grid according to the charge and discharge response mode .

Description

Charge and discharge control system and charge and discharge control method

The present invention relates to a charging and discharging control system and a control method, in particular to a charging and discharging control system and a control method for controlling the charging and discharging between a power storage system and a power grid.

In recent years, because traditional thermal power generation has caused a lot of pollution to the environment, and nuclear power generation has extremely high risks, in order to reduce the burden on the environment caused by power generation, more and more experts and scholars are committed to renewable energy. Development, in order to one day slowly replace the existing thermal or nuclear power generation.

Because the power supply of renewable energy is relatively unstable, the existing power sources are still thermal power or nuclear power generation, and then renewable energy is connected to the grid in the form of auxiliary; among them, the reason for the relatively unstable renewable energy is mainly due to regeneration Energy is dependent on natural phenomena. For example, solar energy mainly uses solar panels to convert the sun's rays into electricity. Therefore, when the weather is bad, its power generation capacity will also decline.

With the rise of environmental awareness, renewable energy sources provide more and more power to the grid, so solving the problem of unstable power supply becomes very important to maintain the quality of power supply. In the existing technology, the automatic frequency control (AFC) system is mainly used to maintain the power supply quality of the grid. When the grid frequency exceeds the standard grid frequency (60Hz), it means that the power supply of the grid exceeds the demand. At this time, AFC will control the battery energy storage system (Battery Energy Storage System, BESS) to absorb the excess power and store it in the battery; on the contrary, when the grid frequency is lower than the standard grid frequency, BESS should immediately save the stored power Provided to the grid.

As mentioned above, BESS should generally reserve enough capacity to absorb (battery charging) or supply (battery discharge) power on the grid in response to changes in grid frequency. Generally, its state of charge (SoC) should be maintained at 50% To 75% instead of 0% or 100%. It can be seen that controlling the output power of BESS to closely respond to changes in grid frequency is a simple and convenient method for AFC services, but frequent charging and discharging will seriously damage the battery life.

In view of the fact that in the existing technology, when the power generated by renewable energy is transmitted to the grid, it is easy to reduce the quality of the grid due to the unstable power supply capacity of the renewable energy. Therefore, in order to maintain the power supply quality of the grid, automatic frequency control is usually used. The system is used to control the charging between the grid and the battery energy storage system, but frequent charging and discharging can easily cause damage to the battery and reduce the service life; therefore, the main purpose of the present invention is to provide a charging and discharging control system that can be used in Maintain the quality of the power grid to a certain level, effectively reducing the number of battery charging and discharging, thereby extending the service life of the battery.

In order to solve the problems of the prior art, the necessary technical means adopted by the present invention is to provide a charging and discharging control system, which controls the charging and discharging between a power storage system and a power grid through a power regulation system. The charging and discharging control system includes a measurement Module and a grid frequency automatic control device.

The measurement module is electrically connected to the power grid and the power conditioning system to measure the real-time grid frequency of the power grid and the actual net output power of the power conditioning system. The power grid frequency automatic control device includes a power grid frequency state judgment module, a service performance judgment module, a power storage interval judgment module, and a core control unit.

The power grid frequency status judgment module is electrically connected to the measurement module and has a plurality of reference frequency bands. The reference frequency band includes at least a standard operating frequency band covering a standard power grid frequency, an emergency operating frequency band far away from the standard power grid frequency, and an The warning operating frequency band between the standard operating frequency band and the emergency operating frequency band, and the grid frequency status determination module is used to determine which of the real-time grid frequency falls within the reference frequency band.

The service performance judgment module is electrically connected to the measurement module. A comparison table of grid frequency and target output power is set up to calculate the corresponding real-time grid frequency based on the real-time grid frequency measured by the measurement module. One is used to make the real-time grid frequency approach the target output power of a standard grid frequency, and use the target output power and the actual net output power to calculate a service efficiency index.

The power storage interval judging module is electrically connected to the power storage system and has a plurality of power storage intervals. The power storage interval includes at least an ideal power storage interval covering an ideal power storage value, and a neighboring ideal power storage value and located in the ideal A high-operation flexible power storage interval outside the power storage interval, a low-operation flexible power storage interval far away from the ideal power storage value, and a medium-operation flexible power storage interval between the high-operation flexible power storage interval and the low-operation flexible power storage interval The electric quantity interval is used to determine which of the electric storage capacity of the electric storage system falls within the electric energy storage interval.

The core control unit is electrically connected to the power grid frequency status judgment module, the service efficiency judgment module, and the power storage interval judgment module. There is a grid frequency automatic control rule table. The grid frequency automatic control rule table is based on the reference frequency band and service The performance index and power storage interval respectively define a plurality of charge and discharge response modes. The charge and discharge response modes include a stable response mode, a predictive response mode, an instant response mode, a standby charge recovery response mode, and a standby discharge recovery response mode. The core control unit controls the charging and discharging between the power storage system and the grid in accordance with the regulation system of the power regulation system.

Among them, in the stable response mode, the predicted response mode and the immediate response mode, when the real-time grid frequency falls within a first zero power adjustment frequency band, a second power zero adjustment frequency band, and a third power zero adjustment frequency band, respectively, The actual net output power of the power storage system to the power grid is zero. The central frequencies of the first zero power adjustment frequency band, the second power zero adjustment frequency band and the third power zero adjustment frequency band are all standard grid frequencies, and the frequency of the first power zero adjustment frequency band The width is greater than the bandwidth of the second power zero adjustment frequency band, and the bandwidth of the second power zero adjustment frequency band is greater than the bandwidth of the third power zero adjustment frequency band.

In the standby charging recovery response mode, a standby charging recovery response bandwidth is defined under the condition that the service performance index meets the allowable range of a service performance index, and when the real-time grid frequency falls within the standby charging recovery response bandwidth, The actual net output power of the power storage system to the grid is less than zero. In the standby discharge recovery response mode, a standby discharge recovery response bandwidth is defined under the condition that the service performance index meets the allowable range of the service performance index, and in the real-time grid When the frequency falls within the standby discharge recovery response bandwidth, the actual net output power of the power storage system to the grid is greater than zero.

The present invention also provides a charging and discharging control method, which controls the charging and discharging between a power storage system and a power grid through a power regulation system. The charging and discharging control method includes the following steps (a) to (f):

Step (a) is to measure the real-time grid frequency of one of the power grids and the actual net output power of one of the power conditioning systems.

Step (b) is to determine which of the plurality of reference frequency bands the real-time power grid frequency falls into. The reference frequency band includes at least a standard operating frequency band covering a standard power grid frequency, an emergency operating frequency band far away from the standard power grid frequency, and an emergency operating frequency band located in the standard operating frequency band and Warning operation frequency band between emergency operation frequency bands.

Step (c) is based on the real-time grid frequency measured by the measurement module, calculate the corresponding one of the real-time grid frequency to make the real-time grid frequency approach the target output power of a standard grid frequency, and use the target output The power and the actual net output power calculate a service performance index.

Step (d) is to determine which of the plurality of power storage intervals the power storage of one of the power storage systems falls into. The power storage interval includes at least an ideal power storage region covering an ideal power storage value, a neighboring ideal power storage value and located in A highly operational flexible power storage interval outside the ideal power storage interval, a low-operation flexible power storage interval far away from the ideal power storage value, and a medium operating flexibility between the highly operational flexible power storage interval and the low-operation flexible power storage interval Power storage interval.

Step (e) is to establish a grid frequency automatic control rule table. The grid frequency automatic control rule table defines a plurality of charge and discharge reaction modes according to the reference frequency band, service efficiency index and power storage interval. The charge and discharge reaction mode includes a stable response. Mode, a predictive response mode, an immediate response mode, a standby charge recovery response mode, and a standby discharge recovery response mode.

Step (f) is to determine which of the real-time grid frequency, service performance index and power storage corresponds to the charging and discharging response mode, and controlling the power regulation system to adjust the charging and discharging between the power storage system and the grid accordingly.

Among them, in the stable response mode, the predicted response mode and the immediate response mode, when the real-time grid frequency falls within a first zero power adjustment frequency band, a second power zero adjustment frequency band, and a third power zero adjustment frequency band, respectively, The actual net output power of the storage system to the grid is zero.

The central frequencies of the first zero power adjustment frequency band, the second power zero adjustment frequency band, and the third power zero adjustment frequency band are all standard grid frequencies. The bandwidth of the first power zero adjustment frequency band is greater than that of the second power zero adjustment frequency band. And the bandwidth of the second power zero adjustment frequency band is greater than the bandwidth of the third power zero adjustment frequency band.

In the standby charging recovery response mode, a standby charging recovery response bandwidth is defined under the condition that the service performance index meets the allowable range of a service performance index, and when the real-time grid frequency falls within the standby charging recovery response bandwidth, The actual net output power of the power storage system to the grid is less than zero. In the standby discharge recovery response mode, a standby discharge recovery response bandwidth is defined under the condition that the service performance index meets the allowable range of the service performance index, and in the real-time grid When the frequency falls within the standby discharge recovery response bandwidth, the actual net output power of the power storage system to the grid is greater than zero.

As mentioned above, because the charging and discharging control system and the charging and discharging control method of the present invention use the measurement module to measure the real-time grid frequency of the power grid and the actual net output power of the power conditioning system, and then judge the module and service through the grid frequency status The performance judgment module further obtains the corresponding reference frequency band and service performance index, and uses the power storage interval judgment module to judge the power storage interval corresponding to the power storage of the power storage system, and then according to the reference frequency band, service performance index and power storage Multiple charge-discharge response modes are defined by interval, so that the power conditioning system can be controlled according to the corresponding charge-discharge response mode, so that the power conditioning system controls the charge and discharge between the storage system and the grid according to the charge-discharge response mode.

The specific embodiments adopted in the present invention will be further illustrated by the following embodiments and drawings.

Please refer to the first to second figures. The first figure shows the system block diagram of the charging and discharging control system provided by the preferred embodiment of the present invention; the second figure shows the automatic grid frequency provided by the preferred embodiment of the present invention. System block diagram of the control device.

As shown in the first to second figures, a charging and discharging control system 100 includes a measurement module 1 and an automatic control device 2 for grid frequency. Among them, the charging and discharging control system 100 controls the charging and discharging between a power storage system 300 and a power grid 400 through a power regulation system 200. In addition, the power grid 400 and the power storage system 300 are more electrically connected to a renewable energy source 500 so that the power generated by the renewable energy source 500 is provided to the power grid 400.

The measurement module 1 is electrically connected to the power grid 400 and the power conditioning system 200, and is used to measure the real-time grid frequency of the power grid 400 and the actual net output power of the power conditioning system 200. The first signal S1 and a second signal S2 carrying the actual net output power are transmitted.

The power grid frequency automatic control device 2 includes a power grid frequency status judgment module 21, a service performance judgment module 22, a power storage interval judgment module 23, a core control unit 24 and a power control module 25.

The power grid frequency status judgment module 21 is electrically connected to the measurement module 1 to receive the first signal S1, and is provided with a plurality of reference frequency bands (as shown in Table 1 below). The reference frequency band includes a standard power grid frequency The standard operating frequency band, an emergency operating frequency band away from the standard power grid frequency, and a warning operating frequency band between the standard operating frequency band and the emergency operating frequency band, and the grid frequency status determining module 21 is used to determine that the real-time grid frequency falls within the reference frequency band Whichever one, a third signal S3 containing the judgment result of the reference frequency band is transmitted.

Table 1: Reference frequency band vs. frequency range. Reference frequency band Frequency (F) Standard operating frequency band 59.94Hz ≤ F ≤ 60.06Hz The first alert operating frequency band 59.78Hz ≤ F ＜ 59.94Hz Second alert operating frequency band 60.06Hz ＜ F ≤ 60.22Hz First Emergency Operation Band F ＜ 59.78Hz Second emergency operating band 60.22Hz ＜ F

As mentioned above, the standard power grid frequency in this embodiment is 60 Hz, and the standard operating frequency band is greater than or equal to 59.94 Hz and less than or equal to 60.06 Hz. The alert operating frequency band includes a first alert operating frequency band and a second alert operating frequency band. The guard operation frequency band is greater than or equal to 59.78 Hz and less than 59.94 Hz, the second guard operation frequency band is greater than or equal to 60.06 Hz and less than or equal to 60.22 Hz, the emergency operation frequency band includes a first emergency operation frequency band and a second emergency operation frequency band, the first emergency operation The frequency band is less than 59.78 Hz, and the second emergency operation frequency band is greater than 60.22 Hz.

The service performance judgment module 22 is electrically connected to the measurement module 1 to receive the second signal S2, and is provided with a grid frequency and target output power comparison table for real-time measurement based on the measurement module Grid frequency, a target output power corresponding to the real-time grid frequency is calculated. The target output power is used to make the real-time grid frequency approach the standard grid frequency, and the service efficiency judgment module 22 makes use of the target output power and the actual net output power. A service performance index is calculated, so as to transmit a fourth signal S4 containing the service performance index.

Table 2: Comparison table of grid frequency and target output power. Preset frequency Output power upper limit Lower limit of output power Preset frequency Output power upper limit Lower limit of output power 60Hz 9% -9% 60Hz 9% -9% 59.98Hz 9% -9% 60.02Hz 9% -9% 59.97Hz 10.7% -6.5% 60.03Hz 6.5% -10.7% 59.96Hz 12.4% -4% 60.04Hz 4% -12.4% 59.95Hz 14.1% -1.6% 60.05Hz 1.6% -14.1% 59.94Hz 15.8% 0.9% 60.06Hz -0.9% -15.8% 59.93Hz 17.5% 3.4% 60.07Hz -3.4% -17.5% 59.89Hz 24.3% 13.3% 60.11Hz -13.3% -24.3% 59.88Hz 26% 15.8% 60.12Hz -15.8% -26% 59.87Hz 27.7% 18.3% 60.13Hz -18.3% -27.7% 59.86Hz 29.3% 20.7% 60.14Hz -20.7% -29.3% 59.84Hz 32.7% 25.7% 60.16Hz -25.7% -32.7% 59.83Hz 34.4% 28.2% 60.17Hz -28.2% -34.4% 59.82Hz 36.1% 30.7% 60.18Hz -30.7% -36.1% 59.81Hz 37.8% 33.1% 60.19Hz -33.1% -37.8% 59.80Hz 39.5% 35.6% 60.20Hz -35.6% -39.5% 59.78Hz 42.9% 40.6% 60.22Hz -40.6% -42.9% 59.77Hz 44.6% 43.0% 60.23Hz -43.0% -44.6% 59.76Hz 46.3% 45.5% 60.24Hz -45.5% -46.3% 59.75Hz 48% 48% 60.25Hz -48% -48%

As shown in Table 2 above, the grid frequency and target output power comparison table includes a plurality of preset frequencies, a plurality of output power upper limits corresponding to the preset frequencies, and a plurality of output power lower limits corresponding to the preset frequencies; Among them, the preset frequency is increased or decreased based on the standard grid frequency. The upper limit of output power and the lower limit of output power refer to the upper limit of output power and the lower limit of output power at the corresponding preset frequency. The output power in between is the allowable output power.

The formula used by the service performance judgment module 22 to calculate the service performance index using the target output power and the actual net output power is: SPM= 100%-|TPP-RPP|. Among them, SPM (Service Performance Measurement) is the service performance index; TPP (Target Output Power in percentage) is the target output power, and RPP (Real Output Power in percentage) is the actual net output power.

In addition, the service performance indicators also include a short-term average of service performance indicators and a long-term average of service performance indicators. For example, the short-term average of service performance indicators is calculated in units of ten minutes to calculate the average target output power and the average actual net output power. For example, the long-term average value of the service performance index is calculated in the unit of one month to calculate the average value of the target output power and the average value of the actual net output power.

The power storage interval judging module 23 is electrically connected to the power storage system 300 and has a plurality of power storage intervals (as shown in Table 3 below). The power storage interval includes an ideal power storage interval covering an ideal power storage value, and A highly operational flexible power storage interval adjacent to the ideal power storage value and outside the ideal power storage interval, a low-operation flexible power storage interval far away from the ideal power storage value, and a highly operational flexible power storage interval and a low-operation flexible power storage interval The flexible power storage interval is moderately operated between the intervals to determine which of the power storage intervals of the power storage system falls, and a fifth signal S5 carrying the judgment result of the power storage interval is transmitted.

Table 3: Comparison table of power storage interval and power. Power storage interval Power (SoC) Ideal power storage interval 60% ≤ SoC ≤ 80% Highly operational flexible power storage range 45% ≤ SoC ＜ 60%; 80% ＜ SoC ≤ 85% Moderate operation flexible power storage interval 30% ≤ SoC ＜ 45%; 85% ＜ SoC ≤ 90% Low operation flexible power storage interval SoC ＜ 30% or 90% ＜ SoC

The core control unit 24 is electrically connected to the grid frequency state judgment module 21, the service efficiency judgment module 22, and the power storage interval judgment module 23. There is a grid frequency automatic control rule table, and the grid frequency automatic control rule table is based on reference The frequency band, service performance index and power storage interval respectively define a plurality of charge and discharge response modes. The charge and discharge response modes include a stable response mode, a predictive response mode, an instant response mode, a standby charge recovery response mode, and a standby discharge recovery mode. Reaction mode. The power control module 25 is electrically connected to the core control unit 24 and the power conditioning system 200.

As mentioned above, the core control unit 24 will send a power output control command S6 to the power control module 25 according to one of the charge and discharge response modes, so as to drive the power control module 25 to control the power output of the power conditioning system 200. In turn, the power conditioning system 200 controls the charging and discharging between the power storage system 300 and the power grid 400 according to the output power corresponding to the charging and discharging response mode. Among them, the grid frequency automatic control rule table of this embodiment is shown in Table 4 below.

Table 4: The grid frequency automatic control rule table. Service performance index Reference frequency band SRD NOD HRD Power storage interval CH MASPM-10m＞95%, and MASPM-1M＞95% Stable reaction mode Stable reaction mode Predictive response mode MASPM-10m≦95%, or MASPM-1M≦95% Predictive response mode Predictive response mode Instant response mode CM MASPM-10m＞95%, and MASPM-1M＞95% Recovery response mode Stable reaction mode Predictive response mode MASPM-10m≦95%, or MASPM-1M≦95% Predictive response mode Predictive response mode Instant response mode CL MASPM-10m＞95%, and MASPM-1M＞95% Recovery response mode Stable reaction mode Predictive response mode MASPM-10m≦95%, or MASPM-1M≦95% Predictive response mode Predictive response mode Instant response mode CE MASPM-10m＞95%, and MASPM-1M＞95% Recovery response mode Recovery response mode Recovery response mode MASPM-10m≦95%, or MASPM-1M≦95% Recovery response mode Recovery response mode Recovery response mode

The above code CH is the ideal power storage interval, CM is the highly operating flexible power storage interval, CL is the moderate operating flexible power storage interval, CE is the low operating flexible power storage interval, SRD is the standard operating frequency band of the standard grid frequency, NOD It is a warning operation frequency band, HRD is an emergency operation frequency band, MASPM-10m is a short-term average of service performance indicators calculated in ten minutes, and MASPM-1M is a long-term average of service performance indicators calculated in units of one month ; Among them, in the service performance index, 95% of the benchmark value used for comparison is a service performance index allowable value, and then the allowable value of the service performance index is compared with the short-term average value of the service performance index or the long-term average value of the service performance index Define the allowable range of service performance indicators. In addition, the recovery response mode is a standby charge recovery response mode or a standby discharge recovery response mode, and the detailed distinction will be described later.

The detailed description of the multiple charge and discharge reaction modes defined based on the above grid frequency automatic control rule table is as follows.

The stable response mode also has a plurality of first low frequency bands with a grid frequency lower than the standard grid frequency and a plurality of first high frequency bands with a grid frequency higher than the standard grid frequency. Each first low frequency band is derived from the grid frequency and the target output power In the comparison table, the lowest of the output power upper limit values corresponding to the corresponding preset frequency is extracted as a first low-band buffer output power; each first high-band is from the grid frequency and the target output power comparison table The highest output power lower limit value corresponding to the corresponding preset frequency is captured as a first high-band buffer output power. The first low-band buffer output power and the first high-band buffer output power corresponding to the first low-frequency band and the first high-frequency band of the stable response mode of this embodiment are shown in Table 5 below.

Table 5: In the stable response mode, the first low-band buffer output power corresponding to the first low-frequency band, and the first high-band buffer output power corresponding to the first high-frequency band. The first low frequency band (Hz) The first low-band buffer output power The first high frequency band (Hz) The first high-band buffer output power 60.00-59.94 0% 60.00-60.06 0% 59.93-59.87 17.5% 60.07-60.13 -17.5% 59.86-59.82 29.3% 60.14-60.18 -29.3% 59.81-59.78 37.8% 60.19-60.22 -37.8% 59.77-59.75 45.5% 60.23-60.25 -45.5%

The predictive response mode has a plurality of second low frequency bands with a grid frequency lower than the standard grid frequency and a plurality of second high frequency bands with a grid frequency higher than the standard grid frequency. Each second low frequency band is compared with the target output power from the grid frequency The upper limit of the output power corresponding to the corresponding preset frequency is extracted in the table, the lowest of which is used as a second low-band buffer output power; each second high-band is extracted from the grid frequency and the target output power comparison table The highest output power lower limit value corresponding to the corresponding preset frequency is used as a second high-band buffer output power. The second low-band buffer output power and the second high-band buffer output power corresponding to the second low-frequency band and the second high-frequency band of the prediction response mode of this embodiment correspond to the following Table 6 below.

Table 6: In the predictive response mode, the second low-band buffer output power corresponding to the second low-frequency band, and the second high-band buffer output power corresponding to the second high-frequency band. The second low frequency band (Hz) The second low-band buffer output power The second high frequency band (Hz) The second high-band buffer output power 60.00-59.96 0% 60.00-60.04 0% 59.95-59.89 14.1% 60.05-60.11 -14.1% 59.88-59.84 26.0% 60.12-60.16 -26.0% 59.83-59.81 34.4% 60.17-60.19 -34.4% 59.80-59.78 39.5% 60.20-60.22 -39.5%

The real-time response mode has a plurality of real-time output power values based on the preset frequency, and the real-time output power values are respectively the average value of the corresponding output power upper limit and the output power lower limit. The real-time response mode of this embodiment corresponds to the real-time output power value set for each preset frequency as shown in Table 7 below.

Table 7: In the real-time response mode, the preset frequency and the corresponding real-time output power value. Preset frequency Instant output power value Preset frequency Instant output power value 60Hz 0% 60Hz 0% 59.98Hz 0% 60.02Hz 0% 59.97Hz 2.1% 60.03Hz -2.1% 59.96Hz 4.2% 60.04Hz -4.2% 59.95Hz 6.3% 60.05Hz -6.3% 59.94Hz 8.3% 60.06Hz -8.3% 59.93Hz 10.4% 60.07Hz -10.4% 59.89Hz 18.8% 60.11Hz -18.8% 59.88Hz 20.9% 60.12Hz -20.9% 59.87Hz 23.0% 60.13Hz -23.0% 59.86Hz 25.0% 60.14Hz -25.0% 59.84Hz 29.2% 60.16Hz -29.2% 59.83Hz 31.3% 60.17Hz -31.3% 59.82Hz 33.4% 60.18Hz -33.4% 59.81Hz 35.5% 60.19Hz -35.5% 59.80Hz 37.6% 60.20Hz -37.6% 59.78Hz 41.7% 60.22Hz -41.7% 59.77Hz 44.6% 60.23Hz -44.6% 59.76Hz 46.3% 60.24Hz -46.3% 59.75Hz 48% 60.25Hz -48%

As mentioned above, the stable response mode has a first zero power adjustment frequency band (59.94 Hz to 60.06 Hz), the predicted response mode has a second power zero adjustment frequency band (59.96 Hz to 60.04 Hz), and the instant response mode has a third power zero adjustment frequency band (59.96 Hz to 60.04 Hz). The power zero adjustment frequency band (59.98 Hz to 60.02 Hz). When the instant grid frequency falls within the first power zero adjustment frequency band, the second power zero adjustment frequency band and the third power zero adjustment frequency band, the actual net effect of the power storage system 300 on the power grid 400 is The output power is zero.

Among them, the central frequency of the first zero power adjustment frequency band, the second power zero adjustment frequency band, and the third power zero adjustment frequency band are all standard grid frequencies (60 Hz), and the bandwidth of the first power zero adjustment frequency band is greater than that of the second power zero adjustment frequency band. The frequency width of the frequency band, and the frequency width of the second power zero adjustment frequency band is greater than the frequency width of the third power zero adjustment frequency band;

The standby charging recovery response mode sets a plurality of charging priority output power values according to the preset frequency. The standby charging recovery response mode of this embodiment corresponds to the charging priority output power value set for each preset frequency, as shown in Table 8 below.

Table 8: In the standby charging recovery response mode, the preset frequency and the corresponding charging priority output power value. Preset frequency Charge priority output power value Preset frequency Charge priority output power value 60Hz -9% 60Hz -9% 59.98Hz -9% 60.02Hz -9% 59.97Hz -9% 60.03Hz -9% 59.96Hz -4% 60.04Hz -15.8% 59.95Hz -4% 60.05Hz -15.8% 59.94Hz -4% 60.06Hz -15.8% 59.93Hz 0% 60.07Hz -17.5% 59.89Hz 0% 60.11Hz -24.3% 59.80Hz 0% 60.20Hz -39.5% 59.75Hz 0% 60.25Hz -48%

As mentioned above, in the standby charge recovery response mode, a standby charge recovery response bandwidth is defined under the condition that the service performance index meets the allowable range of the service performance index, and the frequency of the power grid falls below the standby charge recovery response bandwidth when the grid frequency is in real time. When the actual net output power of the power storage system to the grid is less than zero.

The standby discharge recovery response mode sets a plurality of discharge priority output power values according to the preset frequency. The standby discharge recovery response mode of this embodiment corresponds to the discharge priority output power value set for each preset frequency, as shown in Table 9 below.

Table 9: In the standby discharge recovery response mode, the preset frequency and the corresponding discharge priority output power value. Preset frequency Discharge priority output power value Preset frequency Discharge priority output power value 60Hz 9% 60Hz 9% 59.98Hz 9% 60.02Hz 9% 59.97Hz 9% 60.03Hz 9% 59.96Hz 15.8% 60.04Hz 4% 59.95Hz 15.8% 60.05Hz 4% 59.94Hz 15.8% 60.06Hz 4% 59.93Hz 17.5% 60.07Hz 0% 59.89Hz 24.3% 60.11Hz 0% 59.80Hz 39.5% 60.20Hz 0% 59.75Hz 48% 60.25Hz 0%

As mentioned above, in the standby discharge recovery response mode, a standby discharge recovery response bandwidth is defined under the condition that the service performance index meets the allowable range of the service performance index, and the real-time grid frequency falls within the standby discharge recovery response bandwidth When the actual net output power of the power storage system to the grid is greater than zero.

Please continue to refer to FIG. 3A and FIG. 3B. FIG. 3A and FIG. 3B show the flow chart of the charging and discharging control method provided by the preferred embodiment of the present invention.

As shown in Figures 1 to 3B, the charging and discharging control method of the present invention controls the charging and discharging between the power storage system 300 and the power grid 400 through the power regulation system 200. The charging and discharging control method includes the following steps.

First, step S101 is to measure the real-time grid frequency of the power grid 400 and the actual net output power of the power conditioning system 200.

Next, step S102 is to determine which of the plurality of reference frequency bands the real-time grid frequency falls within.

Then, step S103 is to calculate the target output power corresponding to the real-time grid frequency based on the real-time grid frequency measured by the measurement module 1, and calculate the service performance index by using the target output power and the actual net output power.

After that, step S104 is to determine which of the plurality of power storage intervals the power storage amount of the power storage system 300 falls within.

Next, step S105 is to establish a grid frequency automatic control rule table. The grid frequency automatic control rule table defines a plurality of charging and discharging reaction modes according to the reference frequency band, service efficiency index, and power storage interval.

Finally, step S106 is to determine which of the real-time grid frequency, service performance index, and power storage interval corresponds to the charging and discharging response mode, and controlling the power conditioning system 200 to adjust the charging and discharging between the power storage system 300 and the power grid 400 accordingly.

Wherein, in step S106, the power storage interval judging module 23 is used to first determine whether the power storage capacity of the power storage system 300 falls within the low-level operation flexible power storage interval, and if the power storage does not fall within the low-level operation flexible power storage interval, The grid frequency status judgment module 21 determines which of the real-time grid frequency falls within the reference frequency band. If the grid frequency state judgment module 21 judges that the real-time grid frequency falls within the standard operating frequency band, it will further determine whether the service performance index is greater than a service performance index allowable value through the service performance judgment module 22. If the service performance index is less than the allowable value of the service performance index, the power control module 25 sends a power output control command to the power conditioning system 200 according to the predicted response mode, so that the power conditioning system 200 controls the power storage system 300 and the grid according to the predicted response mode 400 charging and discharging.

However, if the aforementioned power storage interval judging module 23 determines that the power storage of the power storage system 300 falls within the low-level operation flexible power storage interval, it will further determine whether the power storage is less than 30%. This is because the low-level operation flexible power storage is The power range includes two ranges (SoC ＜ 30%, or 90% ＜ SoC); then, if the stored power is less than 30%, the power control module 25 will send a power output control command to the power regulation system according to the standby charging recovery response mode 200, so that the power conditioning system 200 controls the charging and discharging between the power storage system 300 and the power grid 400 according to the standby charging recovery response mode.

Conversely, when the power storage interval judging module 23 determines that the power storage of the power storage system 300 falls within the low-level operation flexible power storage interval, and further determines that the power storage is greater than 30%, the power control module 25 will resume according to the standby discharge The response mode sends a power output control command to the power conditioning system 200, so that the power conditioning system 200 controls the charging and discharging between the power storage system 300 and the grid 400 according to the standby discharge recovery response mode.

On the other hand, when the power storage interval judging module 23 initially judges that the power storage of the power storage system 300 does not fall within the low-level operation flexible power storage interval, and the grid frequency state judging module 21 judges that the real-time grid frequency falls within the alert operation In the frequency band, the service performance judgment module 22 determines whether the service performance index is greater than the allowable value of the service performance index; when the service performance index is greater than the allowable value of the service performance index, the power control module 25 sends out power according to the stable response mode Output control commands to the power conditioning system 200, so that the power conditioning system 200 controls the charging and discharging between the power storage system 300 and the grid 400 according to the stable response mode; on the contrary, if the service performance index is less than the service performance index allowable value, the power control module 25 The power output control command is sent to the power conditioning system 200 according to the predicted response mode, so that the power conditioning system 200 controls the charging and discharging between the power storage system 300 and the grid 400 according to the predicted response mode.

In summary, when the power storage interval judging module 23 starts, it determines that the power storage of the power storage system 300 does not fall within the low-level operation flexible power storage interval, and the grid frequency status judging module 21 judges that the real-time grid frequency falls within the emergency When operating the frequency band, the service performance determination module 22 will determine whether the service performance index is greater than the service performance index allowable value; when the service performance index is greater than the service performance index allowable value, the power control module 25 will send out according to the predictive response mode The power output control command is sent to the power conditioning system 200, so that the power conditioning system 200 controls the charging and discharging between the power storage system 300 and the grid 400 according to the predicted response mode; conversely, if the service performance index is less than the allowable value of the service performance index, the power control module 25 will send a power output control command to the power conditioning system 200 according to the immediate response mode, so that the power conditioning system 200 controls the charging and discharging between the power storage system 300 and the grid 400 according to the immediate response mode.

In summary, because the charging and discharging control system and the charging and discharging control method of the present invention use the measurement module to measure the real-time grid frequency of the power grid and the actual net output power of the power conditioning system, and then use the grid frequency status judgment module to determine the actual net output power of the power grid. The service performance judgment module further obtains the corresponding reference frequency band and service performance index, and uses the power storage interval judgment module to judge the power storage interval corresponding to the power storage system of the power storage system, and then according to the reference frequency band, service performance index and storage A number of charge and discharge response modes are defined by the power interval, so that the power conditioning system can be controlled according to the corresponding charge and discharge response mode, so that the power conditioning system controls the charge and discharge between the storage system and the grid according to the charge and discharge response mode .

Based on the above detailed description of the preferred embodiments, it is hoped that the characteristics and spirit of the present invention can be described more clearly, and the scope of the present invention is not limited by the preferred embodiments disclosed above. On the contrary, its purpose is to cover various changes and equivalent arrangements within the scope of the patent for which the present invention is intended.

100: charge and discharge control system 1: Measurement module 2: Grid frequency automatic control device 21: Grid frequency status judgment module 22: Service performance judgment module 23: Power storage interval judgment module 24: core control unit 25: Power control module 200: Power conditioning system 300: Power storage system 400: Grid 500: renewable energy S1: The first signal S2: second signal S3: The third signal S4: The fourth signal S5: The Fifth Signal S6: Power output control command

The first figure is a system block diagram showing the charging and discharging control system provided by the preferred embodiment of the present invention; The second figure shows the system block diagram of the grid frequency automatic control device provided by the preferred embodiment of the present invention; and The third diagram A and the third diagram B show the flow chart of the charging and discharging control method provided by the preferred embodiment of the present invention.

100: charge and discharge control system

1: Measurement module

2: Grid frequency automatic control device

21: Grid frequency status judgment module

22: Service performance judgment module

23: Power storage interval judgment module

24: core control unit

25: Power control module

200: Power conditioning system

300: Power storage system

S1: The first signal

S2: second signal

S3: The third signal

S4: The fourth signal

S5: The Fifth Signal

S6: Power output control command

Claims (17)

A charging and discharging control system controls the charging and discharging between a power storage system and a power grid through a power regulation system. The charging and discharging control system includes: A measurement module, which is electrically connected to the power grid and the power regulation system, for measuring a real-time grid frequency of the power grid and an actual net output power of the power regulation system; and An automatic control device for grid frequency, including: A power grid frequency status judgment module is electrically connected to the measurement module and is provided with a plurality of reference frequency bands. The reference frequency bands include at least a standard operating frequency band covering a standard power grid frequency and a frequency far away from the standard power grid frequency. An emergency operating frequency band and a warning operating frequency band between the standard operating frequency band and the emergency operating frequency band, and the grid frequency state determination module is used to determine which of the reference frequency bands the real-time grid frequency falls; A service performance judgment module is electrically connected to the measurement module. A comparison table of grid frequency and target output power is provided to calculate the real-time grid frequency measured by the measurement module. The one corresponding to the real-time grid frequency is used to make the real-time grid frequency approach the target output power of a standard grid frequency, and use the target output power and the actual net output power to calculate a service efficiency index; A power storage interval judging module is electrically connected to the power storage system and is provided with a plurality of power storage intervals. The power storage intervals include at least an ideal power storage interval covering an ideal power storage value, and a neighboring ideal power storage interval. A high-operation flexible power-storage interval that has a power storage value and is outside the ideal power-storage range, a low-operation-flexible power-storage region far away from the ideal power-storage value, and a high-operation-flexible power-storage region and the low-operation flexibility Moderately operated flexible power storage intervals between power storage intervals to determine which of the power storage intervals one of the power storage systems falls within; and A core control unit, which is electrically connected to the grid frequency state judgment module, the service efficiency judgment module, and the power storage interval judgment module, is provided with a grid frequency automatic control rule table, the grid frequency automatic control rule table According to the reference frequency bands, the service performance indicators, and the power storage intervals, a plurality of charge and discharge response modes are respectively defined. The charge and discharge response modes include a stable response mode, a predictive response mode, an instant response mode, and a In a standby charge recovery response mode and a standby discharge recovery response mode, the core control unit further drives the power regulation system to control the relationship between the power storage system and the grid according to the charge and discharge response modes according to one of the charge and discharge response modes.的charge and discharge; Wherein, in the stable response mode, the predicted response mode, and the instant response mode, the instant power grid frequency falls within a first power zero adjustment frequency band, a second power zero adjustment frequency band, and a third power zero adjustment frequency band, respectively When the frequency band is used, the actual net output power of the power storage system to the grid is zero, and the central frequencies of the first zero power adjustment frequency band, the second power zero adjustment frequency band, and the third power zero adjustment frequency band are all the standards Power grid frequency, the bandwidth of the first zero power adjustment frequency band is greater than the bandwidth of the second power zero adjustment frequency band, and the frequency width of the second power zero adjustment frequency band is greater than the frequency width of the third power zero adjustment frequency band, In the standby charge recovery response mode, a standby charge recovery response frequency bandwidth is defined under the condition that the service performance index meets the allowable range of a service performance index, and when the real-time grid frequency falls below the standby charge recovery response frequency When it is wide, the actual net output power of the power storage system to the grid is less than zero. In the standby discharge recovery response mode, a standby is defined under the condition that the service performance index meets the allowable range of the service performance index Discharge recovery response bandwidth, and when the instant power grid frequency falls within the standby discharge recovery response bandwidth, the actual net output power of the power storage system to the power grid is greater than zero. The charging and discharging control system according to claim 1, wherein the grid frequency and target output power comparison table includes a plurality of preset frequencies, a plurality of output power upper limits corresponding to the preset frequencies, and a plurality of corresponding The lower limit of the output power of the preset frequencies. The charging and discharging control system according to claim 2, wherein the stable response mode is further provided with a plurality of first low frequency bands whose grid frequency is lower than the standard grid frequency, and each of the first low frequency bands is derived from the grid frequency In the comparison table with the target output power, the lowest of the upper limit values of the output power corresponding to the preset frequencies is retrieved as a first low-band buffered output power. The charge and discharge control system according to claim 3, wherein the predictive response mode is further provided with a plurality of second low frequency bands whose grid frequency is lower than the standard grid frequency, and each of the second low frequency bands is derived from the grid frequency The lowest of the output power upper limit values corresponding to the preset frequencies extracted from the target output power comparison table is used as a second low-band buffered output power. The charging and discharging control system according to claim 2, wherein the stable response mode is further provided with a plurality of first high frequency bands whose grid frequency is higher than the standard grid frequency, and each of the first high frequency bands is derived from the grid frequency The highest of the lower limit values of the output power corresponding to the preset frequencies extracted from the target output power comparison table is used as a first high-band buffer output power. The charging and discharging control system according to claim 5, wherein the predictive response mode is further provided with a plurality of second high frequency bands whose grid frequency is higher than the standard grid frequency, and each of the second high frequency bands is derived from the grid frequency The highest of the output power lower limit values corresponding to the preset frequencies extracted from the target output power comparison table is used as a second high-band buffer output power. The charging and discharging control system according to claim 2, wherein the real-time response mode is provided with a plurality of real-time output power values according to the preset frequencies, and the real-time output power values are the corresponding output power upper limits respectively Value and the average value of the lower limit value of the output power. The charging and discharging control system according to claim 1, wherein the service performance indicator includes a short-term average value of service performance indicators and a long-term average value of service performance indicators. The charging and discharging control system according to claim 1, wherein the standard power grid frequency is 60 Hz, the standard operating frequency band is greater than or equal to 59.94 Hz and less than or equal to 60.06 Hz, and the alert operating frequency band includes a first alert operating frequency band and a first alert operating frequency band. Two alert operating frequency bands, the first alert operating frequency band is greater than or equal to 59.78 Hz and less than 59.94 Hz, the second alert operating frequency band is greater than 60.06 Hz and less than or equal to 60.22 Hz, and the emergency operating frequency band includes a first emergency operating frequency band and a first emergency operating frequency band. The second emergency operation frequency band, the first emergency operation frequency band is less than 59.78 Hz, and the second emergency operation frequency band is greater than 60.22 Hz. A charging and discharging control method is to control the charging and discharging between a power storage system and a power grid through a power regulation system. The charging and discharging control method includes the following steps: (a) Measure the real-time grid frequency of one of the power grids and the actual net output power of one of the power regulation systems; (b) Determine which of the plurality of reference frequency bands the real-time power grid frequency falls into. The reference frequency bands include at least a standard operating frequency band covering a standard power grid frequency, an emergency operating frequency band far away from the standard power grid frequency, and an emergency operating frequency band located in the standard The warning operation frequency band between the operation frequency band and the emergency operation frequency band; (c) According to the real-time grid frequency measured by the measurement module, calculate the target output power corresponding to the real-time grid frequency to make the real-time grid frequency approach a standard grid frequency, and use The target output power and the actual net output power are calculated to calculate a service performance index; (d) Determine which of the plurality of power storage intervals of one of the power storage systems falls in, the power storage intervals include at least an ideal power storage interval covering an ideal power storage value, and a neighboring ideal power storage value And is located outside the ideal power storage interval, a high operation flexible power storage interval, a low operation flexible power storage interval far away from the ideal power storage value, and a high operation flexible power storage interval and the low operation flexible power storage interval Intermittently operate the flexible power storage interval; (e) Establish a grid frequency automatic control rule table. The grid frequency automatic control rule table defines a plurality of charging and discharging response modes according to the reference frequency bands, the service performance index, and the power storage intervals. The response mode includes a stable response mode, a predictive response mode, an instant response mode, a standby charge recovery response mode, and a standby discharge recovery response mode; and F ； Wherein, in the stable response mode, the predicted response mode, and the instant response mode, the instant power grid frequency falls within a first power zero adjustment frequency band, a second power zero adjustment frequency band, and a third power zero adjustment frequency band, respectively Frequency band, the actual net output power of the power storage system to the power grid is zero, wherein the center frequencies of the first zero power adjustment frequency band, the second power zero adjustment frequency band, and the third power zero adjustment frequency band are all For the standard power grid frequency, the bandwidth of the first zero power adjustment frequency band is greater than the bandwidth of the second power zero adjustment frequency band, and the frequency width of the second power zero adjustment frequency band is greater than the frequency of the third power zero adjustment frequency band In the standby charge recovery response mode, a standby charge recovery response bandwidth is defined under the condition that the service performance index meets the allowable range of a service performance index, and the standby charge recovery response bandwidth is defined when the real-time grid frequency falls within the standby charge recovery When the response frequency is wide, the actual net output power of the power storage system to the grid is less than zero. In the standby discharge recovery response mode, the service performance indicator is defined under the condition that the service performance indicator meets the allowable range of the service performance indicator A standby discharge recovery response bandwidth, and when the instant power grid frequency falls within the standby discharge recovery response bandwidth, the actual net output power of the power storage system to the power grid is greater than zero. The charge and discharge control method according to claim 10, wherein step (f) further includes the following steps: (f1) Determine whether the stored power falls within the low-level operation flexible power storage interval; (f2) If the power storage does not fall within the low-level operation flexible power storage interval, determine which of the reference frequency bands the real-time grid frequency falls within; (f3) If the real-time grid frequency falls within the standard operating frequency band, determine whether the service performance index is greater than a service performance index allowable value; and (f4) If the service performance index is less than the allowable value of the service performance index, the power output control command is sent to the power conditioning system according to the predicted response mode, so that the power conditioning system controls the power storage according to the predicted response mode Charging and discharging between the system and the grid. The charge and discharge control method according to claim 11, wherein after step (f1), the following steps are further included: (f21) If the stored power falls within the low-level operation flexible power storage interval, determine whether the stored power is less than 30%; and (f211) If the stored power is less than 30%, send the power output control command to the power regulation system according to the standby charge recovery response mode, so that the power regulation system controls the power storage system according to the standby charge recovery response mode Charging and discharging with the grid. The charge and discharge control method according to claim 12, wherein after step (f21), the following steps are further included: (f212) If the stored power is greater than 30%, send the power output control command to the power conditioning system according to the standby discharge recovery response mode, so that the power conditioning system controls the power storage according to the standby discharge recovery response mode Charging and discharging between the system and the grid. The charge and discharge control method according to claim 10, wherein after step (f2), the following steps are further included: (f31) If the real-time grid frequency falls within the warning operating frequency band, determine whether the service performance index is greater than the allowable value of the service performance index; and (f311) If the service performance index is greater than the allowable value of the service performance index, the power output control command is sent to the power conditioning system according to the stable response mode, so that the power conditioning system controls the power storage according to the stable response mode Charging and discharging between the system and the grid. The charge and discharge control method according to claim 14, wherein after step (f31), the following steps are further included: (f312) If the service performance index is less than the allowable value of the service performance index, the power output control command is sent to the power conditioning system according to the predicted response mode, so that the power conditioning system controls the power storage according to the predicted response mode Charging and discharging between the system and the grid. The charge and discharge control method according to claim 10, wherein after step (f2), the following steps are further included: (f32) If the real-time grid frequency falls within the emergency operation frequency band, determine whether the service performance index is greater than the allowable value of the service performance index; and (f321) If the service performance index is greater than the allowable value of the service performance index, the power output control command is sent to the power conditioning system according to the predicted response mode, so that the power conditioning system controls the power storage according to the predicted response mode Charging and discharging between the system and the grid. The charge and discharge control method according to claim 16, wherein after step (f32), the following steps are further included: (f322) If the service performance index is less than the allowable value of the service performance index, the power output control command is sent to the power regulation system according to the real-time response mode, so that the power regulation system controls the power storage according to the real-time response mode Charging and discharging between the system and the grid.

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