CN109066790B - Wind power plant primary frequency modulation and AGC coordination control method based on station control - Google Patents

Abstract

The invention increases the droop frequency adjustment control strategy of the wind farm power in the active power control device of the wind farm that is centrally connected to the grid; After the set primary frequency modulation dead zone is exceeded, the primary frequency modulation power target value P _PFR of the energy management platform after the primary frequency modulation action is calculated according to the droop frequency regulation control strategy of the wind farm power, and the primary frequency modulation measurement and control system will calculate the new primary frequency modulation power target value P _PFR . The energy management platform is redistributed to each wind turbine, and the wind turbine adjusts their output according to the command, realizing the overall primary frequency regulation function of the wind farm, so that the primary frequency regulation of the wind farm and the AGC control of the wind farm can be coordinated.

Description

A Wind Farm Primary Frequency Modulation and AGC Coordinated Control Method Based on Station Control

technical field

The invention belongs to the technical field of wind power, and in particular relates to a wind farm primary frequency modulation and AGC coordinated control method based on station control.

Background technique

In recent years, new energy power generation represented by wind power has developed rapidly. By the end of 2017, my country's wind power and photovoltaic installed capacity had reached 210 million kilowatts, ranking first in the world, of which the proportion of new energy in the Northwest Power Grid reached 32.8%. The proportion of new energy in the total installed capacity of the grid is getting higher and higher. As the proportion of wind power and photovoltaics in the local power grid continues to increase, UHV DC transmission is gradually put into operation, the operation and structure of the power grid become more and more complex, and the power balance and frequency regulation of the power system are increasingly difficult. The increase in the proportion of new energy power generation is bound to reduce the installed proportion of conventional thermal and hydropower units. The proportion of primary frequency regulation capacity in the system is reduced, which has an impact on the frequency security of the power grid. Therefore, it is necessary to tap the frequency regulation capacity of new energy power stations. The wind farms participating in the primary frequency regulation of the power grid have carried out preliminary research and pilot projects in some regional power grids.

At present, wind farms are generally put into AGC (automatic power generation control) operation mode. According to the regional power grid conditions, there are two situations of AGC load-limited operation and unlimited load operation. Often under different AGC operation modes, the performance of primary frequency regulation is quite different. If the primary frequency regulation of the wind farm is not coordinated with the AGC, the performance of the primary frequency regulation may be affected, so it is necessary to coordinate the control of the wind farm AGC and the primary frequency regulation.

SUMMARY OF THE INVENTION

In order to solve the above problems, the present invention provides a wind farm primary frequency modulation and AGC coordinated control method based on site control, which solves the problem that primary frequency modulation and AGC cannot be coordinated.

In order to achieve the above object, the method for coordinated control of primary frequency modulation and AGC of a wind farm based on the field control of the present invention includes the coordination of the primary frequency modulation measurement and control system and the AGC of the wind farm, and the coordination of the primary frequency modulation measurement and control system and the energy management platform;

Among them, the coordination process between the primary frequency modulation measurement and control system and the wind farm AGC is: the primary frequency modulation measurement and control system sends the primary frequency modulation input and the primary frequency modulation action signal to the wind farm AGC, and the wind farm AGC sends the theoretical power of each energy management platform, AGC given The power and air volume management platform controls the actual power of the fan and sends it to the primary frequency modulation measurement and control system;

When the wind farm AGC receives a frequency modulation input and a frequency modulation action signal at the same time, it stops sending the AGC given power to the energy management platform, and the primary frequency modulation measurement and control system sends the primary frequency modulation power target value P _PFR to the energy management platform; a frequency modulation action returns After that, the primary frequency modulation measurement and control system sends the last received AGC given power to each energy management platform respectively, and then the wind farm AGC normally sends the AGC given power to the energy management platform.

The coordination process between the primary frequency modulation measurement and control system and the energy management platform is: during the frequency modulation period, the primary frequency modulation measurement and control system sends the frequency modulation input signal, the frequency modulation action signal and the primary frequency modulation power target value P _PFR of the energy management platform to each energy management platform. To FM action signal for FM.

Further, when the grid frequency deviation is within the range of the primary frequency modulation dead zone: the primary frequency modulation measurement and control system does not operate, and the AGC of the wind farm sends the AGC given power command to each energy platform; when the grid frequency deviation exceeds the primary frequency modulation dead zone: once The frequency modulation measurement and control system sends a frequency modulation action signal to the wind farm AGC and the energy management platform. The wind farm AGC stops sending the AGC given power to the energy platform, and the primary frequency modulation measurement and control system sends the energy management platform target power P _PFR to the energy management platform.

Further, when P _{theoretical power-} P _{actual power} ≥ P _rated *λ, it is judged to be limited load; at this time, the calculation formula of the target power P _PFR of each energy management platform is: P _PFR =P _AGC +△P _PFC ; when When P _{theoretical power} -P _{actual power} <P _rated *λ, it is judged to be unlimited load; the calculation formula of the target power P _PFR of each energy management platform at this time is: P _PFR =P _{actual power} +△P _PFC ;

In the above formula: P _{theoretical power} is the power that can be generated by the wind farm at the current wind speed; P _{actual power} is the actual power of the current wind farm; λ is the deviation coefficient between the power that can be generated by the wind farm at the current wind speed and the actual power of the current wind farm, Generally, 0.05 can be taken; P _AGC is the given value of the AGC power of the wind farm; ΔP _PFC is the primary frequency modulation adjustment amount of the wind farm, and λ is the deviation coefficient between the theoretical power and the actual power of the wind farm.

Further, the range of the primary frequency modulation dead zone is 0.05 Hz to 0.1 Hz.

Further, the energy management platform receives the frequency modulation action signal and performs frequency modulation in a fast adjustment mode.

Further, in the active power control device of the wind farm that is centrally connected for grid-connected operation, a droop frequency regulation control strategy for the power of the wind farm is added.

Compared with the prior art, the present invention has at least the following beneficial technical effects. The present invention mainly solves that the wind farm AGC active power control and the primary frequency modulation often cannot be coordinated and controlled, and the wind farm AGC and the primary frequency modulation are mutually blocked. The invention proposes to judge whether the wind farm is in a load-limited condition, and proposes different primary frequency regulation calculation methods for limited load and unlimited load, which ensures that the wind farm AGC and primary frequency regulation can function normally in actual operation, and ensures that the two function is functioning normally.

Description of drawings

Figure 1 is a schematic diagram of the wind farm primary frequency modulation and AGC coordinated control.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Referring to FIG. 1 , a method for coordinated control of primary frequency modulation and AGC of a wind farm based on site control includes:

1. Coordination of wind farm AGC and energy management platform

The AGC of the wind farm sends the given power of the AGC to each energy management platform, and the energy management platform feeds back the actual power of the fan to the AGC of the wind farm.

2. Coordination between primary frequency modulation measurement and control system and wind farm AGC

The primary frequency modulation measurement and control system communicates with the wind farm AGC. The primary frequency modulation measurement and control system sends the primary frequency modulation input and the primary frequency modulation action signal to the wind farm AGC. The wind farm AGC manages the theoretical power, AGC given power and air volume of each energy management platform. The actual power of the platform-controlled fan is sent to the primary frequency modulation measurement and control system.

When the wind farm AGC receives a frequency modulation input and a frequency modulation action signal at the same time, it stops sending the AGC given power to the energy management platform, and the primary frequency modulation measurement and control system sends the primary frequency modulation power target value P _PFR to the energy management platform. After the primary frequency modulation action is restored, the primary frequency modulation measurement and control system sends the last received AGC given power to each energy management platform, and then the wind farm AGC normally sends the AGC given power to the energy management platform. Among them, the one-time frequency modulation action reset means that the frequency returns to the dead zone range, and the first-time frequency modulation has exited.

3. Coordination between primary frequency modulation measurement and control system and energy management platform

During frequency regulation (when the wind farm AGC receives a frequency regulation input and a frequency regulation action signal, it stops sending the AGC given power to the energy management platform, and the primary frequency regulation measurement and control system sends a frequency regulation power target value PPFR to the energy management platform), a frequency regulation measurement and control The system sends the frequency modulation input signal, the frequency modulation action signal and the primary frequency modulation power target value P _PFR of the energy management platform to each energy management platform. The energy management platform receives the FM action signal and uses the fast adjustment mode to tune the frequency.

After a frequency regulation action, the determination method of the primary frequency regulation power target value P _PFR of the wind farm energy management platform is as follows:

1. When the grid frequency deviation is within the range of the primary frequency modulation dead zone:

When the primary frequency modulation measurement and control system does not act, the AGC of the wind farm normally sends the given power command of the AGC to each energy platform.

2. When the power grid frequency deviation exceeds the primary frequency modulation dead zone, the primary frequency modulation measurement and control system acts:

The primary frequency modulation measurement and control system sends a primary frequency modulation action signal to the wind farm AGC and the energy management platform, the wind farm AGC stops sending the AGC given power to the energy platform, and the primary frequency modulation measurement and control system sends the energy management platform target power P _PFR to the energy management platform. The following two situations:

(1) Under the limited load condition of the wind farm:

When P _{theoretical power -} P _{actual power} ≥ P _rated * λ, it is judged as limited load;

The target power of each energy management platform is: P _PFR =P _AGC +△P _PFC

(2) Unlimited load condition

When P _{theoretical power} - P _{actual power} < P _rated * λ, it is judged as unlimited load

The target power of each energy management platform is: P _PFR = P _{actual power} + △P _PFC

In the above formula: P _{theoretical power} is the power that can be generated by the wind farm at the current wind speed; generally it can be taken as 0.05; P _{actual power} is the actual power of the current wind farm; P _AGC is the given value of the _AGC power of the wind farm; The adjustment amount of the primary frequency modulation, λ is the deviation coefficient between the power that can be generated by the wind farm at the current wind speed and the actual power of the current wind farm, and λ generally takes 0.05.

The invention increases the droop frequency adjustment control strategy of the wind farm power in the active power control device of the wind farm that is centrally connected to the grid; After the set primary frequency modulation dead zone is exceeded, the primary frequency modulation power target value P _PFR of the energy management platform after the primary frequency modulation action is calculated according to the droop frequency regulation control strategy of the wind farm power, and the primary frequency modulation measurement and control system will calculate the new primary frequency modulation power target value P _PFR . The energy management platform is redistributed to each wind turbine, and the wind turbine adjusts their output according to the command, realizing the overall primary frequency regulation function of the wind farm, so that the primary frequency regulation of the wind farm and the AGC control of the wind farm can be coordinated.

The above content is only to illustrate the technical idea of the present invention, and cannot limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention all fall within the scope of the claims of the present invention. within the scope of protection.

Claims (6)

1. A wind power plant primary frequency modulation and AGC coordination control method based on station control is characterized by comprising coordination of a primary frequency modulation measurement and control system and a wind field AGC and coordination of the primary frequency modulation measurement and control system and an energy management platform;

the coordination process of the primary frequency modulation measurement and control system and the wind field AGC is as follows: the primary frequency modulation measurement and control system sends primary frequency modulation input and primary frequency modulation action signals to a wind field AGC, and the wind field AGC sends theoretical power, AGC given power and actual power of a wind volume management platform control fan of each energy management platform to the primary frequency modulation measurement and control system;

when the wind field AGC receives primary frequency modulation input and primary frequency modulation action signals at the same time, the transmission of AGC given power to the energy management platform is stopped, and a primary frequency modulation measurement and control system transmits a primary frequency modulation power target value P to the energy management platform_PFR(ii) a After the primary frequency modulation action is reset, the primary frequency modulation measurement and control system respectively sends the AGC given power received finally to each energy management platform, and then the wind field AGC sends the AGC given power to the energy management platforms;

the coordination process of the primary frequency modulation measurement and control system and the energy management platform is as follows: during the frequency modulation period, the primary frequency modulation measurement and control system transmits a frequency modulation input signal, a frequency modulation action signal and a primary frequency modulation power target value P of the energy management platform to each energy management platform_PFRAnd the energy management platform performs frequency modulation according to the received frequency modulation action signal.

2. The coordination control method for primary frequency modulation and AGC of the wind power plant based on the station control according to claim 1, characterized in that when the grid frequency deviation is within a primary frequency modulation dead zone range: the primary frequency modulation measurement and control system does not act, and an AGC given power instruction is sent to each energy platform by a wind field AGC; when the grid frequency deviation exceeds a primary frequency modulation dead zone: the primary frequency modulation measurement and control system sends a primary frequency modulation action signal to a wind field AGC and energy management platformThe wind field AGC stops sending AGC given power to the energy platform, and the primary frequency modulation measurement and control system sends energy management platform target power P to the energy management platform_PFR。

3. The wind power plant primary frequency modulation and AGC coordination control method based on station control according to claim 2, characterized in that when P is_{Theoretical power-}P_{Actual power}≥P_{Rated value}When lambda is set, judging the load limit; target power P of each energy management platform at the moment_PFRIs calculated by the formula P_PFR=P_AGC+△P_PFC；

When P is present_{Theoretical power}-P_{Actual power}＜P_{Rated value}When lambda is set, judging the load is unlimited; target power P of each energy management platform at the moment_PFRIs calculated by the formula P_PFR= P_{Actual power}+△P_PFC；

In the above formula: p_{Theoretical power}The power which can be generated by the wind power plant under the current wind speed; p_{Actual power}The actual power of the current wind power plant; lambda is the deviation coefficient of the power which can be generated by the wind power plant at the current wind speed and the actual power of the current wind power plant, and is taken as 0.05; p_AGCSetting a power set value for AGC of a wind power plant; delta P_PFCAnd adjusting the primary frequency modulation adjustment quantity for the wind power plant.

4. The wind power plant primary frequency modulation and AGC coordinated control method based on the station control according to claim 2, characterized in that a primary frequency modulation dead zone range is 0.05 Hz-0.1 Hz.

5. The wind power plant primary frequency modulation and AGC coordination control method based on station control according to claim 1, characterized in that the energy management platform receives a frequency modulation action signal and performs frequency modulation in a fast adjustment mode.

6. The coordination control method for the primary frequency modulation and AGC of the wind power plant based on the station control according to claim 1 is characterized in that a droop frequency adjustment control strategy for increasing the power of the wind power plant is adopted in an active power control device of the wind power plant which is centrally connected in grid-connected operation.

Images