CN109193891B - Improved hybrid energy storage system power distribution method for prolonging service life of PMSG battery - Google Patents
Improved hybrid energy storage system power distribution method for prolonging service life of PMSG battery Download PDFInfo
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- CN109193891B CN109193891B CN201811293330.9A CN201811293330A CN109193891B CN 109193891 B CN109193891 B CN 109193891B CN 201811293330 A CN201811293330 A CN 201811293330A CN 109193891 B CN109193891 B CN 109193891B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000003990 capacitor Substances 0.000 claims abstract description 91
- 238000007599 discharging Methods 0.000 claims abstract description 29
- 238000010248 power generation Methods 0.000 claims description 11
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 230000008859 change Effects 0.000 abstract description 4
- 230000004044 response Effects 0.000 abstract description 4
- 238000005457 optimization Methods 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000007796 conventional method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 239000002803 fossil fuel Substances 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000003915 air pollution Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006727 cell loss Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
- H02J7/1469—Regulation of the charging current or voltage otherwise than by variation of field
- H02J7/1492—Regulation of the charging current or voltage otherwise than by variation of field by means of controlling devices between the generator output and the battery
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
An improved hybrid energy storage system power allocation method to extend PMSG battery life, the method comprising: calculating the storage power of the hybrid energy storage system; distributing between the battery and the capacitor according to the calculated storage power of the hybrid energy storage system, and setting the rated voltage of the direct-current bus as the optimal control voltage of the capacitor; determining whether the hybrid energy storage system is in a charging or discharging state according to whether the voltage of the direct-current bus is higher than a rated value or lower than the rated value; the power allocation value does not need to be determined by any optimization algorithm, and the response time is reduced. And the optimal control voltage (OSCV) of the capacitor in the hybrid energy storage system is considered, and the hybrid energy storage system is preferentially enabled to reach the optimal control voltage of the capacitor. And power fluctuation caused by wind power change is quickly and effectively stabilized. And the charging and discharging times of the battery are reduced, the power loss of the battery is reduced, and the service life of the battery is prolonged.
Description
Technical Field
The invention relates to a power distribution control method of a hybrid energy storage system, in particular to an improved power distribution method of the hybrid energy storage system for prolonging the service life of a battery of a PMSG (permanent magnet synchronous wind generator) wind power generation system.
Background
As the number of the world population increases and the level of industrialization in each country increases, the amount of fossil fuel used is greatly increased. This not only results in a reduction in the reserves of fossil fuels, but also in an increase in the price of fossil fuels and serious air pollution. Therefore, with the increasing global demand for fuel and concern about environmental pollution, renewable energy is receiving more and more attention. In particular, due to the advantages of fast return on investment of wind generators and capacity up to several megawatts, wind energy has become the most widely used renewable energy source at present.
In the past, when the wind power generator is incorporated into a power grid with low capacity, the wind power generator has low influence on the power grid, and the change of the power of the wind power generator is not enough to influence the frequency of the power grid. However, as the number of wind power generators installed worldwide increases, the influence of power fluctuation on the power grid cannot be ignored any more. Especially when the power of the wind generating set fluctuates greatly, the frequency of the wind generating set which can affect the power grid changes. These variations will lead to instability of the power system. In order to avoid these instabilities, fluctuations in the wind turbine output power must be limited.
Some countries have already developed the requirement of grid-connected operation of wind power generation units to limit excessive fluctuation of output power of the wind power generation units. For example, in the wind turbine grid-connected operation regulations in japan and china, it is required that the fluctuation of the output power of the wind turbine should not exceed 2% and 7% of the rated power every 30 minutes. It is now common to suppress fluctuations in the output power of a wind turbine generator by two methods, the first of which is to make the wind turbine generator output a stable power by changing the angle of attack of the blades of the wind turbine generator and the speed of the wind turbine generator. A second approach is to use an energy storage element. In the method, the wind driven generator does not need to change the windward angle of the blades and the speed of the fan, and the fluctuation of the output power is stabilized through the energy storage element, so that the wind driven generator set is ensured to output stable power.
In the existing research, different energy storage elements are used for absorbing power fluctuation, a battery is used as the energy storage element, a capacitor is used as the energy storage element, a hybrid energy storage system comprising the battery and the capacitor is used, and simulation verifies that when the battery and the capacitor are used simultaneously, the dynamic characteristic is better, and the output power is smoother. When a battery and capacitor hybrid energy storage system is used, the fluctuating power to be compensated by the hybrid energy storage system needs to be distributed through a filter. High frequency power fluctuation needs to be compensated by a capacitor, and low frequency power fluctuation is compensated by a battery. If the power fluctuations to be compensated for by the battery and capacitor are not properly distributed, excessive use of the battery will result and the life of the battery will be shortened. In addition, the battery life is affected by the excessive peak current and the excessive variation range of the charge amount.
Many existing studies have explored for optimizing power distribution in hybrid energy storage systems, and the literature proposes to distribute power between batteries and capacitors through optimization algorithms. Further literature proposes to compensate by distributing power fluctuations to different kinds of capacitors and batteries by optimizing the control technique. However, the above method has problems of long response time, and the response may be split.
Disclosure of Invention
To overcome the above-mentioned prior art, an improved hybrid energy storage system power allocation method is provided that extends the life of the PMSG battery.
The object of the invention is achieved in the following way:
an improved hybrid energy storage system power allocation method to extend PMSG battery life, the method comprising:
a) calculating the storage power of the hybrid energy storage system;
comparing an actual voltage value on the direct current bus with a rated value, inputting a voltage difference value serving as an input value into a PI (proportional integral) controller, and outputting the storage power of the hybrid energy storage system by the PI controller;
b) distributing between the battery and the capacitor according to the calculated storage power of the hybrid energy storage system, and setting the rated voltage of the direct-current bus as the optimal control voltage of the capacitor; determining whether the hybrid energy storage system is in a charging or discharging state according to whether the voltage of the direct-current bus is higher than a rated value or lower than the rated value;
when the voltage of the direct-current bus is higher than a rated value, the hybrid energy storage system is in a charging state;
when the hybrid energy storage system is in a charging state and the capacitor voltage is lower than the optimal control voltage: the current i of the batterybattSet to 0, the electric energy is absorbed only by the capacitor, thereby reducing the charging time of the battery; once the voltage of the capacitor reaches the optimal control voltage, dividing the power fluctuation into high-frequency fluctuation and low-frequency fluctuation through a low-pass filter, storing the low-frequency power fluctuation difference by a battery, and storing the high-frequency power fluctuation difference by the capacitor; when the hybrid energy storage system is in a charging state and the voltage of the capacitor is higher than the optimal control voltage, dividing the power fluctuation into high-frequency fluctuation and low-frequency fluctuation through a low-pass filter, storing the power fluctuation difference of the low frequency by a battery, and storing the power fluctuation difference of the high frequency by the capacitor;
when the direct current bus voltage is lower than the rated value, the hybrid energy storage system is in a discharging state:
when the hybrid energy storage system is in a discharging state and the capacitor voltage is lower than the optimal control voltage: dividing power fluctuation into high-frequency fluctuation and low-frequency fluctuation through a low-pass filter, discharging and stabilizing a low-frequency power fluctuation difference value through a battery, and discharging and stabilizing a high-frequency power fluctuation difference value through a capacitor; when the hybrid energy storage system is in a discharging state and the capacitor voltage is higher than the optimal control voltage: the current i of the batterybattSet to 0 and then all power differences are first discharged by the capacitorThe voltage is stabilized, thereby reducing the discharge time of the battery; once the voltage of the capacitor reaches the optimal control voltage, the power fluctuation is divided into high-frequency fluctuation and low-frequency fluctuation through a low-pass filter, wherein the low-frequency power fluctuation difference is stabilized by battery discharge, and the high-frequency power fluctuation difference is stabilized by capacitor discharge.
The low-pass filter adopts a low-pass filter which is 10 times of the operating frequency (500Hz) of the power system.
The invention has the beneficial effects that: the power allocation value does not need to be determined by any optimization algorithm, and the response time is reduced. And the optimal control voltage (OSCV) of the capacitor in the hybrid energy storage system is considered, and the hybrid energy storage system is preferentially enabled to reach the optimal control voltage of the capacitor. And power fluctuation caused by wind power change is quickly and effectively stabilized. And the charging and discharging times of the battery are reduced, the power loss of the battery is reduced, and the service life of the battery is prolonged.
Drawings
FIG. 1 is a flow chart of a method of power distribution for a hybrid energy storage system modified to extend battery life of a PMSG wind turbine, in accordance with an embodiment of the present invention;
FIG. 2 is a simplified block diagram of a wind power generation system equipped with a permanent magnet wind generator and a battery and capacitor hybrid energy storage system;
FIG. 3 is a diagram illustrating a method for calculating the energy storage allocation of each component of the hybrid energy storage system;
fig. 4 is a flowchart of a battery charging and discharging control method for a hybrid energy storage system according to the present invention;
FIG. 5 is a graph showing the variation of wind speed;
FIG. 6 is a graph of the output power of a permanent magnet wind power generation system equipped with a hybrid energy storage system device;
FIG. 7 is a power curve of a hybrid energy storage system;
FIG. 8 is a graph comparing power curves of batteries in the method of the present patent and the conventional method;
FIG. 9 is a waveform of capacitor voltage;
fig. 10 is a graph comparing the power loss of the battery in the method of the present patent and the conventional method.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The invention provides an improved hybrid energy storage system power distribution method for prolonging the service life of a PMSG battery, which comprises a PMSG wind power generation system comprising a battery and capacitor hybrid energy storage system, as shown in figure 2, a permanent magnet wind power generator absorbs wind energy from wind power according to the rotating speed of blades and converts the wind energy into electric energy to be transmitted to a direct current bus. And then the electric energy is transmitted to the power grid through the converter. When the wind speed fluctuates, that is, the power of the permanent magnet wind driven generator fluctuates, the power fluctuation needs to be stabilized by a hybrid energy storage system consisting of a battery and a capacitor and connected to a direct current bus. The electric energy output to the power grid is kept stable so as to meet the grid-connected operation requirement of the power grid. The system can be composed of 2 parts, a permanent magnet wind driven generator part and a hybrid energy storage system part composed of a battery and a capacitor.
(1) The model of the permanent magnet wind power generator part is as follows:
wherein Pw is the electric power generated by the permanent magnet wind driven generator, Vw is the wind speed, and Tw is the electromagnetic torque of the permanent magnet wind driven generator. Cp is a wind power factor, lambda is the ratio of the speed of the tip end of the wind driven generator blade to the wind speed, beta is the windward angle of the blade, rho is the air density, and R is the equivalent resistance.
(2) The hybrid energy storage system model formed by the battery and the capacitor is as follows:
wherein U isdcIs a DC bus voltage, R0Is the no-load resistance, L, of the battery0Is no-load reactance, ibattIs the battery current. Is RCThe resistance of the capacitor, Uc, is the capacitor voltage.
Wherein the method comprises the following steps:
c) calculating the storage power of the hybrid energy storage system;
comparing an actual voltage value on the direct current bus with a rated value, inputting a voltage difference value serving as an input value into a PI (proportional integral) controller, and outputting the storage power of the hybrid energy storage system by the PI controller;
d) distributing between the battery and the capacitor according to the calculated storage power of the hybrid energy storage system, and setting the rated voltage of the direct-current bus as the optimal control voltage of the capacitor; determining whether the hybrid energy storage system is in a charging or discharging state according to whether the voltage of the direct-current bus is higher than a rated value or lower than the rated value;
when the voltage of the direct-current bus is higher than a rated value, the hybrid energy storage system is in a charging state;
when the hybrid energy storage system is in a charging state and the capacitor voltage is lower than the optimal control voltage: the current i of the batterybattThe setting is 0, the capacitor only absorbs electric energy, and the battery and the capacitor are prevented from being charged simultaneously, so that the charging time of the battery is reduced; once the voltage of the capacitor reaches the optimal control voltage, dividing the power fluctuation into high-frequency fluctuation and low-frequency fluctuation through a low-pass filter, storing the low-frequency power fluctuation difference by a battery, and storing the high-frequency power fluctuation difference by the capacitor; when the hybrid energy storage system is in a charging state and the voltage of the capacitor is higher than the optimal control voltage, dividing the power fluctuation into high-frequency fluctuation and low-frequency fluctuation through a low-pass filter, storing the power fluctuation difference of the low frequency by a battery, and storing the power fluctuation difference of the high frequency by the capacitor;
when the direct current bus voltage is lower than the rated value, the hybrid energy storage system is in a discharging state:
when the hybrid energy storage system is in a discharging state and the capacitor voltage is lower than the optimal control voltage: dividing power fluctuation into high-frequency fluctuation and low-frequency fluctuation through a low-pass filter, discharging and stabilizing a low-frequency power fluctuation difference value through a battery, and discharging and stabilizing a high-frequency power fluctuation difference value through a capacitor; when the hybrid energy storage system is in a discharging state and the capacitor voltage is higher than the optimal control voltage: the current i of the batterybattSet to 0 and then all power differences are first smoothed by the capacitor discharge, thereby reducing the discharge time of the battery; once the voltage of the capacitor reaches the optimal control voltage, the power fluctuation is divided into high-frequency fluctuation and low-frequency fluctuation through a low-pass filter, wherein the low-frequency power fluctuation difference is stabilized by battery discharge, and the high-frequency power fluctuation difference is stabilized by capacitor discharge.
FIG. 3 is a diagram illustrating a method for calculating the energy storage distribution of each component of the hybrid energy storage system, wherein V isdcrefFor DC bus voltage rating, VdcThe actual value of the direct current bus voltage is obtained. VcIs the voltage of the capacitor, LP filter is a low-pass filter, PHEEThe power difference, Pc, to be compensated for in the hybrid energy storage system is the storage power, P, allocated to the capacitorbattThe storage power allocated for the battery.
Fig. 4 is a flowchart of a method for controlling charging and discharging of a battery in a hybrid energy storage system according to the present invention.
The method provided by the patent firstly detects whether the hybrid energy storage system is in a charging state or a discharging state through the voltage of the direct-current bus. And on the basis, the electric energy is further distributed between the battery and the capacitor by considering whether the voltage of the capacitor is the optimal control voltage (OSCV). If the capacitor voltage is below the optimal control voltage (OSCV) and the DC bus voltage is above the rated value (the energy storage system is in a charged state). X (a control symbol indicating whether the battery can be charged and discharged) in the flowchart is set to 0. At this time, the battery current ibatt is limited to 0 by a PI controller current limiting link, and is stored only by a capacitor.
The other condition that X is 0 is that when the capacitor voltage is higher than the optimal control voltage (OSCV) and the direct current bus voltage is lower than the rated value (the energy storage system is in a discharging state), the battery current i is also limited through the current limiting link of the PI controllerbattLimited to 0 and only discharged by the capacitor.
In other cases, X is 1, i.e. when the battery is put into use, the battery and the capacitor are simultaneously active and according to the detected charging and discharging states of the energy storage system. The speed of power fluctuation is distinguished by a low-pass filter which is 10 times of the operating frequency (500Hz) of the power system, the power fluctuation difference value of low frequency is stored by a battery, and the power fluctuation difference value of high frequency is stored by a capacitor.
The above improved hybrid energy storage system power distribution method is verified by the following specific examples.
The control method is subjected to simulation verification through MATLAB software, and a simulation circuit is shown in fig. 2, wherein the rated power of the permanent magnet wind driven generator is 2MW, the rated wind speed is 12m/s, the battery capacity is 50Kwh, the no-load resistance of the battery is 0.2 omega, the no-load reactance of the battery is 0.1 omega, the capacitor capacity is 0.2F, and the rated voltage of the direct-current bus is 5 kV.
Fig. 5 shows a variation curve of wind speed. FIG. 6 is a graph of the output power of a permanent magnet wind power generation system equipped with a hybrid energy storage system device. As shown, when the wind speed fluctuates, i.e., the input power of the permanent magnet wind turbine fluctuates, the wind power generation system delivers relatively constant electromagnetic power to the grid. The difference between the input and output power is smoothed by the hybrid energy storage system established by this patent.
Fig. 7 shows a power curve of the hybrid energy storage system. Fig. 8 is a graph comparing the variation curves of the battery power in the method of the present patent and the conventional method. It can be seen that the power variation range of the battery is smaller than that of the traditional method by the method provided by the patent. This is because when the voltage of the capacitor is higher than the optimal control voltage (OSCV) and the energy storage system is discharging to the grid, the capacitor alone discharges the electrical energy to the grid, and the battery does not need to discharge to the grid, thereby reducing the discharge time of the battery. When the capacitor voltage is lower than the optimal control voltage (OSCV) and the energy storage system is drawing power from the grid, the battery no longer needs to be charged by the capacitor alone, thereby reducing the charging time of the battery.
As can be seen from fig. 8, compared with the conventional method, the method provided by the present invention reduces the charging and discharging time of the battery and the number of times of using the battery, thereby increasing the service life of the battery. As shown in fig. 8, between 22 th to 25 th seconds and 55 th to 57 th seconds, the battery is not required to be charged because the capacitor voltage is lower than the optimal control voltage and the energy storage system absorbs the electric energy from the power grid, and the battery is not required to be charged only by the capacitor, thereby reducing the charging times and time of the battery.
The capacitor voltage variation waveform is shown in fig. 9. It can be seen that the voltage across the capacitor in the method of the patent reaches the optimum control voltage (OSCV)5kV in advance than in the conventional method. The method provided by the patent considers the influence of the capacitor voltage, and enables the capacitor voltage to reach the optimal charging and discharging state faster than the traditional method. As in fig. 9, during the period from the 5 th second to the 15 th second, it can be seen that the voltage of the capacitor is faster approaching the ideal value in the method proposed by the present patent.
Fig. 10 shows the battery power loss under two methods. It is apparent that the loss of the battery in the method proposed in this patent is smaller than that in the conventional method. As can be seen in fig. 10, the average cell loss for the method proposed herein is reduced from 8.58 kw to less than 6.3 kw. The loss of electric energy is reduced by 28 percent, and the maximum charge-discharge current effective value of the battery is reduced by 15 percent. This means that the charging times and time of the battery are reduced, the loss of the battery is reduced, and the service life of the battery is effectively prolonged.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the overall concept of the present invention, and these should also be considered as the protection scope of the present invention.
Claims (2)
1. An improved hybrid energy storage system power allocation method for prolonging service life of a PMSG battery is characterized in that:
the wind power generation system comprises a PMSG wind power generation system comprising a battery and a capacitor hybrid energy storage system, wherein the wind power generation system consists of 2 parts, a permanent magnet wind power generator part and a hybrid energy storage system part comprising a battery and a capacitor;
(1) the model of the permanent magnet wind power generator part is as follows:
wherein P iswElectric power, V, generated for permanent magnet wind generatorswTw is the electromagnetic torque of the permanent magnet wind turbine, CpThe wind power factor is shown, lambda is the ratio of the tip speed of the blade of the wind driven generator to the wind speed, beta is the windward angle of the blade, rho is the air density, and R is the equivalent resistance;
(2) the hybrid energy storage system model formed by the battery and the capacitor is as follows:
wherein U isdcIs a DC bus voltage, R0Is the no-load resistance of the battery, L0Is no-load reactance, ibattIs the battery current, RCBeing a resistance of a capacitor, UcIs the capacitor voltage;
the method comprises the following steps:
calculating the storage power of the hybrid energy storage system;
comparing an actual voltage value on the direct current bus with a rated value, inputting a voltage difference value serving as an input value into a PI (proportional integral) controller, and outputting the storage power of the hybrid energy storage system by the PI controller;
according to the calculated storage power of the hybrid energy storage system, the distribution is carried out between the battery and the capacitor,
setting the rated voltage of the direct current bus as the optimal control voltage of the capacitor; determining whether the hybrid energy storage system is in a charging or discharging state according to whether the voltage of the direct-current bus is higher than a rated value or lower than the rated value;
when the voltage of the direct-current bus is higher than a rated value, the hybrid energy storage system is in a charging state;
when the hybrid energy storage system is in a charging state and the capacitor voltage is lower than the optimal control voltage: the current i of the batterybattSet to 0, the electric energy is absorbed only by the capacitor, thereby reducing the charging time of the battery; once the voltage of the capacitor reaches the optimum control voltage, the control voltage is passedThe low-pass filter divides the power fluctuation into high-frequency fluctuation and low-frequency fluctuation, the power fluctuation difference of the low frequency is stored by a battery, and the power fluctuation difference of the high frequency is stored by a capacitor; when the hybrid energy storage system is in a charging state and the voltage of the capacitor is higher than the optimal control voltage, dividing the power fluctuation into high-frequency fluctuation and low-frequency fluctuation through a low-pass filter, storing the power fluctuation difference of the low frequency by a battery, and storing the power fluctuation difference of the high frequency by the capacitor;
when the direct current bus voltage is lower than the rated value, the hybrid energy storage system is in a discharging state:
when the hybrid energy storage system is in a discharging state and the capacitor voltage is lower than the optimal control voltage: dividing power fluctuation into high-frequency fluctuation and low-frequency fluctuation through a low-pass filter, discharging and stabilizing a low-frequency power fluctuation difference value through a battery, and discharging and stabilizing a high-frequency power fluctuation difference value through a capacitor; when the hybrid energy storage system is in a discharging state and the capacitor voltage is higher than the optimal control voltage: the current i of the batterybattSet to 0 and then all power differences are first smoothed by the capacitor discharge, thereby reducing the discharge time of the battery; once the voltage of the capacitor reaches the optimal control voltage, the power fluctuation is divided into high-frequency fluctuation and low-frequency fluctuation through a low-pass filter, wherein the low-frequency power fluctuation difference is stabilized by battery discharge, and the high-frequency power fluctuation difference is stabilized by capacitor discharge.
2. The improved hybrid energy storage system power distribution method for extending PMSG battery life of claim 1, wherein: the low-pass filter adopts a low-pass filter which is 10 times of the operating frequency of the power system.
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