Distribution and storage wind power plant wind turbine generator and energy storage coordinated frequency modulation control method and related device
By real-time monitoring of grid frequency changes, combined with the operating status of wind turbines and energy storage systems, and adopting energy storage priority or wind turbine priority frequency control strategies, the problem of insufficient frequency regulation capacity of the new energy system is solved, rapid frequency regulation of wind farms and economical operation of energy storage are achieved, and the safety and stability of the power system are improved.
Patent Information
- Application Number
- CN202510872388.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-26
- Publication Date
- 2025-09-26
AI Technical Summary
As the penetration rate of new energy sources increases, the inertia and primary frequency regulation capacity of traditional synchronous power sources decrease, affecting the safety and stability of the power system. The independent frequency regulation cost of existing energy storage systems is high, and the frequency regulation capabilities of wind turbines are not fully utilized.
By real-time monitoring of grid frequency changes, combined with the operating status of wind turbines and energy storage systems, adopting energy storage priority or wind turbine priority frequency control strategies, and reasonably setting frequency regulation priorities, rapid frequency regulation and economical operation of wind farms can be achieved.
Improve the operational safety of wind turbines in wind farms, ensure the stability of the power system, achieve economical operation of energy storage, and reduce the operational risks of wind farms.
Smart Images
Figure CN120710033A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the field of power system operation control, and specifically relates to a method for controlling the coordinated frequency regulation of wind turbines and energy storage in a wind farm with energy storage, and related devices. Background Art
[0002] my country is experiencing rapid growth in renewable energy generation, including wind and solar power. By the end of 2024, the total installed capacity of grid-connected wind power will reach 530 million kilowatts. Wind power has become the second largest power source in over ten provinces, and the power system is transitioning to a new power system dominated by renewable energy. New energy power generation equipment, connected to the grid through power electronics, lacks inherent inertia and exhibits low interference rejection, weak damping, and weak support. With the increasing penetration of renewable energy, the current power system exhibits "double highs" (a high proportion of renewable energy and a high proportion of power electronics). The inertia and primary frequency regulation capacity of traditional synchronous power sources are continuously decreasing, the system's synchronous support capability is weakening, and the moment of inertia is decreasing, leading to significant safety and stability issues.
[0003] To address these challenges, ensuring safe and stable grid operation and reliable power supply to users has placed higher demands on the high-quality development of renewable energy. Relevant standards, such as the "Guidelines for Power System Safety and Stability" and the "Technical Regulations for Wind Farm Integration into Power Systems," explicitly require renewable energy sites to possess active support capabilities such as inertia response and primary frequency regulation. Energy storage systems, with their energy storage, rapid response, and precise power tracking, are widely considered suitable for frequency regulation in power systems. However, their high investment and operating costs limit their potential for independent participation in frequency regulation. To maximize wind energy resource utilization and ensure grid stability, many regions have recently mandated energy storage deployment ratios of between 10% and 20%. Therefore, it is imperative to develop active frequency support control strategies for wind farms with energy storage that address the frequency regulation requirements of the grid while also taking into account the economic benefits of energy storage, taking into account the frequency regulation characteristics of wind turbines and energy storage systems. This strategy can shift renewable energy generation from passive adaptation and follow-up control to active support and autonomous operation, leveraging the dynamic support role of renewable energy as the primary power source for the grid. This is an inevitable requirement for accelerating the construction of a new power system and achieving high levels of energy security. Summary of the Invention
[0004] The purpose of the present invention is to provide a method and related devices for coordinated frequency regulation control of wind turbines and energy storage in a wind farm with energy storage, so as to improve the safety and stability of the power system.
[0005] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a method for coordinated frequency regulation control of wind turbines and energy storage in a wind farm with energy storage, comprising: Real-time monitoring of grid frequency changes and the operating status of each wind turbine and energy storage system in the wind farm to obtain the adjustable amount of wind power △ P W and the energy storage system's charge and discharge power △ P ESS ; Determine whether the grid frequency exceeds the wind farm frequency regulation dead zone. If so, calculate the wind farm frequency regulation active power demand △ P ref and frequency deviation △ f ; Determine frequency deviation △ f Is it greater than zero? If so, the wind farm adopts the energy storage priority frequency regulation control strategy; if not, determine whether the grid frequency change rate exceeds the fast frequency regulation threshold K1. If so, the wind farm adopts the energy storage priority frequency regulation control strategy; otherwise, the wind farm adopts the wind turbine priority frequency regulation control strategy.
[0006] A further improvement of the present invention is that: the energy storage priority frequency regulation control strategy specifically includes: judging whether the active adjustable amount of the energy storage system is greater than the active power demand of the wind farm frequency regulation △ P ref If so, the frequency regulation is independently controlled by the energy storage system, and the frequency regulation power of the energy storage system is equal to △ P ref Otherwise, the energy storage system and wind turbines work together to perform frequency regulation control, and the frequency regulation power of the energy storage system is equal to the chargeable and dischargeable power △ P ESS , the frequency modulation power of the wind turbine is equal to △ P ref -△ P ESS .
[0007] The present invention is further improved in that: the wind turbine priority frequency control strategy specifically includes: judging the wind power active adjustable amount △ P wt Is it greater than the wind farm frequency regulation active power demand? P ref If so, the wind turbine is independently controlled for frequency regulation, and the frequency regulation power of the wind turbine is equal to △ P ref Otherwise, the energy storage system and the wind turbine will coordinate the frequency regulation control, and the frequency regulation power of the wind turbine will be equal to the adjustable active power of wind power △ P W , the frequency modulation power of the energy storage system is equal to △ P ref -△ P W .
[0008] A further improvement of the present invention is that: the acquisition of wind power active adjustable quantity △P W and the energy storage system's charge and discharge power △ P ESS In the step, the wind power active adjustable amount △ is calculated according to formula (1) P wt : (1) Where: P W is the adjustable amount of wind power active power; P β_i is the variable pitch reserve power of the i-th wind turbine; P J_i is the active adjustable amount of the rotor kinetic energy of the i-th wind turbine; P MPPT_i is the maximum power that can be generated by the i-th wind turbine according to MPPT control; P t_i is the real-time output active power of the i-th wind turbine; J T_i is the moment of inertia of the i-th wind turbine; ω g_i、 ω gend_i are the initial generator speed of the i-th wind turbine and the generator speed after the rotor kinetic energy release is completed; △ t is the rotor kinetic energy support time.
[0009] A further improvement of the present invention is that: the acquisition of wind power active adjustable quantity △ P W and the energy storage system's charge and discharge power △ P ESS In the step, when the energy storage system is in the charging state, the energy storage system charge and discharge power △ is calculated according to formula (2) P ESS When the energy storage system is in the discharge state, the energy storage system charge and discharge power △ is calculated according to formula (3) P ESS ; (2) (3) Among them: P ESS_C is the available charging power of the energy storage system; P ESS_D is the available discharge power of the energy storage system; n The real-time state of charge in the energy storage system is greater than the allowable lower limit SOC min The total number of energy storage units; m The real-time state of charge in the energy storage system is less than the upper limit SOC maxThe total number of energy storage units; P Cmax_i 、 P Dmax_i are the maximum charging power and maximum discharging power of the i-th energy storage unit respectively; P t_i is the real-time charging power or discharging power of the i-th energy storage unit; η i is the energy conversion efficiency of the i-th energy storage unit.
[0010] A further improvement of the present invention is that: the calculation of the wind farm frequency modulation active power demand △ P ref and frequency deviation △ f In the step, the wind farm frequency regulation active power demand △ is calculated according to formula (4) P ref : (4) in: T J is the equivalent inertia time constant of the wind farm; f 、 f n are the actual frequency and rated frequency of the system respectively; P ref1 ,△ P ref2 They are the active power regulation demand of wind farm inertia response and the active power regulation demand of primary frequency regulation respectively; P N is the rated power of the wind farm; K f is the active frequency modulation coefficient of the wind farm.
[0011] The present invention is further improved in that: f=ff d ，f d It is the fixed value of the wind farm frequency regulation dead zone.
[0012] In a second aspect, the present invention provides a wind turbine generator set and energy storage coordinated frequency regulation control device for a wind farm with energy storage, comprising: The monitoring module is used to monitor the frequency changes of the power grid and the operating status of each wind turbine and energy storage system in the wind farm in real time, and obtain the adjustable amount of wind power. P W and the energy storage system's charge and discharge power △ P ESS ; The judgment module is used to determine whether the grid frequency exceeds the wind farm frequency regulation dead zone. If so, it calculates the wind farm frequency regulation active power demand △ P refand frequency deviation △ f ; Control module, used to determine the frequency deviation △ f Is it greater than zero? If so, the wind farm adopts the energy storage priority frequency regulation control strategy; if not, determine whether the grid frequency change rate exceeds the fast frequency regulation threshold K1. If so, the wind farm adopts the energy storage priority frequency regulation control strategy; otherwise, the wind farm adopts the wind turbine priority frequency regulation control strategy.
[0013] In a third aspect, the present invention provides an electronic device comprising a processor and a memory, wherein the processor is configured to execute a computer program stored in the memory to implement the method for coordinated frequency regulation control of wind turbines and energy storage in a wind farm with energy storage.
[0014] In a fourth aspect, the present invention provides a computer-readable storage medium storing at least one instruction, which, when executed by a processor, implements the method for coordinated frequency regulation control of wind turbines and energy storage in a wind farm with energy storage.
[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a method for controlling the coordinated frequency regulation of wind turbines and energy storage in a wind farm with energy storage, comprising: monitoring the frequency change of the power grid and the operating status of each wind turbine and energy storage system in the wind farm in real time, obtaining the adjustable amount of wind power △ P W and the energy storage system's charge and discharge power △ P ESS ; Determine whether the grid frequency exceeds the wind farm frequency regulation dead zone. If so, calculate the wind farm frequency regulation active power demand △ P ref and frequency deviation △ f ; Determine the frequency deviation △ f Is it greater than zero? If so, the wind farm adopts the energy storage priority frequency regulation control strategy; if not, it is determined whether the grid frequency change rate exceeds the fast frequency regulation threshold K1. If so, the wind farm adopts the energy storage priority frequency regulation control strategy; otherwise, the wind farm adopts the wind turbine priority frequency regulation control strategy. The present invention is aimed at the grid-friendly requirements of active frequency regulation of wind farms, comprehensively considers the frequency regulation advantages of wind turbines and energy storage systems, and reasonably sets the frequency regulation priority of wind turbines and energy storage systems according to the direction and intensity of grid frequency disturbances. While achieving rapid frequency regulation of wind farms, it can improve the operational safety of wind turbines in wind farms and realize economical operation of energy storage, thus ensuring the operational safety of the power system.
[0016] Furthermore, the present invention provides a method for coordinated frequency regulation control of wind turbines and energy storage in a wind farm with storage. Traditional wind farms mainly realize active frequency regulation control through technical transformation of wind turbine frequency regulation, which increases the operating risk of wind turbines. Wind farms with storage generally adopt an independent frequency regulation control strategy of energy storage equipment, which does not fully utilize the frequency regulation capability of the wind turbines themselves. By improving the method for coordinated frequency regulation control of wind turbines and energy storage in a wind farm with storage, rapid frequency regulation of the wind farm can be achieved, while the operating safety of the wind turbines in the wind farm can be improved and economical operation of energy storage can be achieved, thereby ensuring the operating safety of the power system.
[0017] Furthermore, the present invention uses real-time wind farm operating data to obtain the real-time active power adjustment of wind turbines and centralized energy storage. Based on the direction and intensity of grid frequency disturbances, the frequency regulation control priority of energy storage and wind turbines is appropriately set. The method proposed in the present invention takes into account the frequency regulation advantages of both wind turbines and energy storage. By appropriately setting the frequency regulation priority of wind turbines and energy storage systems, it achieves rapid frequency regulation of the wind farm while improving the operational safety of wind turbines within the wind farm and achieving economical operation of energy storage, thus ensuring the operational safety of the power system.
[0018] Furthermore, the technical solution provided by the present invention achieves the goal of effectively utilizing the active power regulation capabilities of wind turbines and energy storage devices to participate in the active frequency support of wind farms. The proposed coordinated frequency regulation control strategy for wind turbines and energy storage in wind farms containing energy storage is simple, effective, and easy to implement in engineering.
[0019] Furthermore, the technical solution provided by the present invention has wide application and significant social and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings: Figure 1 This is a flow chart of a method for coordinated frequency regulation control of wind turbines and energy storage in a wind farm equipped with energy storage according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the energy storage priority frequency modulation control strategy according to an embodiment of the present invention; Figure 3 Schematic diagram of a priority frequency regulation control strategy for a wind turbine generator system according to an embodiment of the present invention; Figure 4 This is a flow chart of a method for coordinated frequency regulation control of wind turbines and energy storage in a wind farm equipped with energy storage according to an embodiment of the present invention; Figure 5 This is a structural diagram of a wind turbine generator set and energy storage coordinated frequency regulation control device in a wind farm with energy storage according to an embodiment of the present invention; Figure 6This is a structural block diagram of an electronic device of the present invention. DETAILED DESCRIPTION
[0021] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.
[0022] The following detailed description is an exemplary description and is intended to provide further detailed description of the present invention. Unless otherwise indicated, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. The terms used in the present invention are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention.
[0023] See also Figure 1 As shown, an embodiment of the present invention provides a method for coordinated frequency regulation control of wind turbines and energy storage in a wind farm with energy storage, comprising the following steps: S1: Real-time monitoring of grid frequency changes and the operating status of each wind turbine and energy storage system in the wind farm to obtain the adjustable active power of wind power △ P W and energy storage system charge (discharge) power△ P ESS .
[0024] S2: Determine whether the grid frequency exceeds the wind farm frequency regulation dead zone. If so, calculate the wind farm frequency regulation active power demand △ P ref , and execute step S3, otherwise return to step S1.
[0025] S3: If the frequency deviation △ f If the frequency deviation is greater than zero, the wind farm adopts the energy storage priority frequency regulation control strategy and executes step S4; f If it is less than zero, check whether the grid frequency change rate exceeds the fast frequency regulation threshold K1. If so, refer to Figure 2 As shown, the wind farm adopts the energy storage priority frequency regulation control strategy and executes step S4; otherwise, refer to Figure 3 As shown, the wind farm adopts a wind turbine priority frequency regulation control strategy and executes step S5.
[0026] S4: Determine whether the adjustable active power of the energy storage system is greater than the active power demand for frequency regulation of the wind farm. P ref If so, the frequency regulation is independently controlled by the energy storage system, and the frequency regulation power of the energy storage system is equal to △ P ref Otherwise, the energy storage system and wind turbines work together to perform frequency regulation control, and the frequency regulation power of the energy storage system is equal to △ P ESS, the frequency modulation power of the wind turbine is equal to △ P ref -△ P ESS .
[0027] S5: Determine the adjustable amount of wind power active power △ P wt Is it greater than the wind farm frequency regulation active power demand? P ref If so, the wind turbine is independently controlled for frequency regulation, and the frequency regulation power of the wind turbine is equal to △ P ref Otherwise, the energy storage system and the wind turbine will coordinate the frequency regulation control, and the frequency regulation power of the wind turbine will be equal to △ P W , the frequency modulation power of the energy storage system is equal to △ P ref -△ P W .
[0028] The step S1 comprises: S1-1: Calculate the adjustable wind power active power △ in step S1 according to formula (1) P wt : (1) Among them: P W is the adjustable amount of wind power active power; P β_i is the variable pitch reserve power of the i-th wind turbine; P J_i is the active adjustable amount of the rotor kinetic energy of the i-th wind turbine; P MPPT_i is the maximum power that can be generated by the i-th wind turbine according to MPPT control; P t_i is the real-time output active power of the i-th wind turbine; J T_i is the moment of inertia of the i-th wind turbine; ω g_i、 ω gend_i are the initial generator speed of the i-th wind turbine and the generator speed after the rotor kinetic energy release is completed; △ t This is the rotor kinetic energy support time, which generally does not exceed 10 s.
[0029] S1-2: When the energy storage system is in the charging state, calculate the chargeable (dischargeable) power of the energy storage system in step S1 according to formula (2) P ESSWhen the energy storage system is in the discharge state, calculate the charge (discharge) power of the energy storage system described in step 1 according to formula (3) P ESS .
[0030] (2) (3) Among them: P ESS_C is the available charging power of the energy storage system; P ESS_D is the available discharge power of the energy storage system; n The real-time state of charge in the energy storage system is greater than the allowable lower limit SOC min The total number of energy storage units; m The real-time state of charge in the energy storage system is less than the upper limit SOC max The total number of energy storage units; P Cmax_i 、 P Dmax_i are the maximum charging power and maximum discharging power of the i-th energy storage unit respectively; P t_i is the real-time charging power or discharging power of the i-th energy storage unit; η i is the energy conversion efficiency of the i-th energy storage unit.
[0031] The step S2 comprises: S2-1: Calculate the wind farm frequency regulation active power demand △ in step S2 according to formula (4) P ref .
[0032] (4) in: T J is the equivalent inertia time constant of the wind farm; f 、 f n are the actual frequency and rated frequency of the system respectively; P ref1 ,△ P ref2 They are the active power regulation demand of wind farm inertia response and the active power regulation demand of primary frequency regulation respectively; P N is the rated power of the wind farm; K f is the active frequency modulation coefficient of the wind farm; f is the frequency deviation, △ f=ff d ( fd is the dead zone setting of wind farm frequency regulation).
[0033] See also Figure 4 As shown, an embodiment of the present invention provides a method for coordinated frequency regulation control of wind turbines and energy storage in a wind farm with energy storage, comprising: S100, real-time monitoring of grid frequency changes and the operating status of each wind turbine and energy storage system in the wind farm, and obtaining the adjustable amount of wind power △ P W and the energy storage system's charge and discharge power △ P ESS ; S200, determine whether the grid frequency exceeds the wind farm frequency regulation dead zone, if so, calculate the wind farm frequency regulation active power demand △ P ref and frequency deviation △ f ; S300, judging frequency deviation △ f Is it greater than zero? If so, the wind farm adopts the energy storage priority frequency regulation control strategy; if not, determine whether the grid frequency change rate exceeds the fast frequency regulation threshold K1. If so, the wind farm adopts the energy storage priority frequency regulation control strategy; otherwise, the wind farm adopts the wind turbine priority frequency regulation control strategy.
[0034] In a specific embodiment, the energy storage priority frequency regulation control strategy specifically includes: determining whether the active adjustable amount of the energy storage system is greater than the active power demand of the wind farm frequency regulation Δ P ref If so, the frequency regulation is independently controlled by the energy storage system, and the frequency regulation power of the energy storage system is equal to △ P ref Otherwise, the energy storage system and wind turbines work together to perform frequency regulation control, and the frequency regulation power of the energy storage system is equal to the chargeable and dischargeable power △ P ESS , the frequency modulation power of the wind turbine is equal to △ P ref -△ P ESS .
[0035] In a specific embodiment, the wind turbine priority frequency control strategy specifically includes: determining the wind power active adjustable amount Δ P wt Is it greater than the wind farm frequency regulation active power demand? P ref If so, the wind turbine is independently controlled for frequency regulation, and the frequency regulation power of the wind turbine is equal to △ P ref Otherwise, the energy storage system and the wind turbine will coordinate the frequency regulation control, and the frequency regulation power of the wind turbine will be equal to the adjustable active power of wind power △ PW , the frequency modulation power of the energy storage system is equal to △ P ref -△ P W .
[0036] In a specific embodiment, the wind power active adjustable amount Δ P W and the energy storage system's charge and discharge power △ P ESS In the step, the wind power active adjustable amount △ is calculated according to formula (1) P wt : (1) Among them: P W is the adjustable amount of wind power active power; P β_i is the variable pitch reserve power of the i-th wind turbine; P J_i is the active adjustable amount of the rotor kinetic energy of the i-th wind turbine; P MPPT_i is the maximum power that can be generated by the i-th wind turbine according to MPPT control; P t_i is the real-time output active power of the i-th wind turbine; J T_i is the moment of inertia of the i-th wind turbine; ω g_i、 ω gend_i are the initial generator speed of the i-th wind turbine and the generator speed after the rotor kinetic energy release is completed; △ t is the rotor kinetic energy support time.
[0037] In a specific embodiment, the wind power active adjustable amount Δ P W and the energy storage system's charge and discharge power △ P ESS In the step, when the energy storage system is in the charging state, the energy storage system charge and discharge power △ is calculated according to formula (2) P ESS When the energy storage system is in the discharge state, the energy storage system charge and discharge power △ is calculated according to formula (3) P ESS ; (2) (3) Among them: P ESS_C is the available charging power of the energy storage system; PESS_D is the available discharge power of the energy storage system; n The real-time state of charge in the energy storage system is greater than the allowable lower limit SOC min The total number of energy storage units; m The real-time state of charge in the energy storage system is less than the upper limit SOC max The total number of energy storage units; P Cmax_i 、 P Dmax_i are the maximum charging power and maximum discharging power of the i-th energy storage unit respectively; P t_i is the real-time charging power or discharging power of the i-th energy storage unit; η i is the energy conversion efficiency of the i-th energy storage unit.
[0038] In a specific embodiment, the calculation of the wind farm frequency regulation active power demand Δ P ref and frequency deviation △ f In the step, the wind farm frequency regulation active power demand △ is calculated according to formula (4) P ref : (4) in: T J is the equivalent inertia time constant of the wind farm; f 、 f n are the actual frequency and rated frequency of the system respectively; P ref1 ,△ P ref2 They are the active power regulation demand of wind farm inertia response and the active power regulation demand of primary frequency regulation respectively; P N is the rated power of the wind farm; K f is the active frequency modulation coefficient of the wind farm.
[0039] In one embodiment, Δ f=ff d ，f d It is the fixed value of the wind farm frequency regulation dead zone.
[0040] See also Figure 5 As shown, an embodiment of the present invention provides a wind turbine generator set and energy storage coordinated frequency regulation control device for a wind farm with energy storage, comprising: The monitoring module is specifically configured to monitor the frequency changes of the power grid and the operating status of each wind turbine and energy storage system in the wind farm in real time, and obtain the adjustable amount of wind power. P W and the energy storage system's charge and discharge power △ P ESS ; The judgment module is specifically configured to: determine whether the grid frequency exceeds the wind farm frequency regulation dead zone, and if so, calculate the wind farm frequency regulation active power demand △ P ref and frequency deviation △ f ; The control module is specifically configured to: determine the frequency deviation △ f Is it greater than zero? If so, the wind farm adopts the energy storage priority frequency regulation control strategy; if not, determine whether the grid frequency change rate exceeds the fast frequency regulation threshold K1. If so, the wind farm adopts the energy storage priority frequency regulation control strategy; otherwise, the wind farm adopts the wind turbine priority frequency regulation control strategy.
[0041] In a specific embodiment, the energy storage priority frequency regulation control strategy stored in the control module specifically includes: determining whether the active adjustable amount of the energy storage system is greater than the active power demand of the wind farm frequency regulation Δ P ref If so, the frequency regulation is independently controlled by the energy storage system, and the frequency regulation power of the energy storage system is equal to △ P ref Otherwise, the energy storage system and wind turbines work together to perform frequency regulation control, and the frequency regulation power of the energy storage system is equal to the chargeable and dischargeable power △ P ESS , the frequency modulation power of the wind turbine is equal to △ P ref -△ P ESS .
[0042] In a specific embodiment, the wind turbine priority frequency control strategy stored in the control module specifically includes: determining the wind power active adjustable amount △ P wt Is it greater than the wind farm frequency regulation active power demand? P ref If so, the wind turbine is independently controlled for frequency regulation, and the frequency regulation power of the wind turbine is equal to △ P ref Otherwise, the energy storage system and the wind turbine will coordinate the frequency regulation control, and the frequency regulation power of the wind turbine will be equal to the adjustable active power of wind power △ P W , the frequency modulation power of the energy storage system is equal to △ P ref -△ P W .
[0043] In a specific embodiment, the monitoring module obtains the wind power active adjustable amount Δ P W and the energy storage system's charge and discharge power △ P ESS In the step, the wind power active adjustable amount △ is calculated according to formula (1) P wt : (1) Among them: P W is the adjustable amount of wind power active power; P β_i is the variable pitch reserve power of the i-th wind turbine; P J_i is the active adjustable amount of the rotor kinetic energy of the i-th wind turbine; P MPPT_i is the maximum power that can be generated by the i-th wind turbine according to MPPT control; P t_i is the real-time output active power of the i-th wind turbine; J T_i is the moment of inertia of the i-th wind turbine; ω g_i、 ω gend_i are the initial generator speed of the i-th wind turbine and the generator speed after the rotor kinetic energy release is completed; △ t is the rotor kinetic energy support time.
[0044] In a specific embodiment, the monitoring module obtains the wind power active adjustable amount Δ P W and the energy storage system's charge and discharge power △ P ESS In the step, when the energy storage system is in the charging state, the energy storage system charge and discharge power △ is calculated according to formula (2) P ESS When the energy storage system is in the discharge state, the energy storage system charge and discharge power △ is calculated according to formula (3) P ESS ; (2) (3) Among them: P ESS_C is the available charging power of the energy storage system; P ESS_D is the available discharge power of the energy storage system; n The real-time state of charge in the energy storage system is greater than the allowable lower limit SOC min The total number of energy storage units;m The real-time state of charge in the energy storage system is less than the upper limit SOC max The total number of energy storage units; P Cmax_i 、 P Dmax_i are the maximum charging power and maximum discharging power of the i-th energy storage unit respectively; P t_i is the real-time charging power or discharging power of the i-th energy storage unit; η i is the energy conversion efficiency of the i-th energy storage unit.
[0045] In a specific embodiment, the judgment module calculates the wind farm frequency regulation active power demand Δ P ref and frequency deviation △ f In the step, the wind farm frequency regulation active power demand △ is calculated according to formula (4) P ref : (4) in: T J is the equivalent inertia time constant of the wind farm; f 、 f n are the actual frequency and rated frequency of the system respectively; P ref1 ,△ P ref2 They are the active power regulation demand of wind farm inertia response and the active power regulation demand of primary frequency regulation respectively; P N is the rated power of the wind farm; K f is the active frequency modulation coefficient of the wind farm.
[0046] In one embodiment, Δ f=ff d ，f d It is the fixed value of the wind farm frequency regulation dead zone.
[0047] It can be seen from the above technical solution that a method and device for coordinated frequency regulation control of wind turbines and energy storage in a wind farm with energy storage is provided. First, the active power demand for active frequency regulation of the wind farm and the adjustable active power of the wind turbines and centralized energy storage in the field are obtained based on the real-time operation data of the wind farm; then, according to the direction and intensity of the grid frequency disturbance, the wind farm adopts an energy storage priority frequency regulation control strategy or a wind turbine priority frequency regulation control strategy. The present invention takes into account the frequency regulation advantages of wind turbines and energy storage, and reasonably sets the frequency regulation priority of wind turbines and energy storage systems according to the direction and intensity of the grid frequency disturbance. While achieving rapid frequency regulation of the wind farm, it can improve the operational safety of wind turbines in the wind farm and achieve economical operation of energy storage, thus ensuring the operational safety of the power system.
[0048] See also Figure 6 As shown, an embodiment of the present invention provides an electronic device 100 for implementing a method for coordinated frequency regulation control of wind turbines and energy storage in a wind farm; the electronic device 100 includes a memory 101, at least one processor 102, a computer program 103 stored in the memory 101 and executable on the at least one processor 102, and at least one communication bus 104.
[0049] The memory 101 can be used to store the computer program 103. The processor 102 implements the steps of the method for coordinated frequency regulation control of wind turbines and energy storage in a wind farm with energy storage as described in the embodiment by running or executing the computer program stored in the memory 101 and calling the data stored in the memory 101. The memory 101 can mainly include a program storage area and a data storage area. The program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.); the data storage area can store data (such as audio data) created based on the use of the electronic device 100. In addition, the memory 101 can include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device.
[0050] The at least one processor 102 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor 102 may be a microprocessor or any conventional processor, etc. The processor 102 is the control center of the electronic device 100 and connects various parts of the entire electronic device 100 using various interfaces and lines.
[0051] The memory 101 in the electronic device 100 stores a plurality of instructions to implement a method for controlling coordinated frequency regulation of wind turbines and energy storage in a wind farm. The processor 102 can execute the plurality of instructions to implement: Real-time monitoring of grid frequency changes and the operating status of each wind turbine and energy storage system in the wind farm to obtain the adjustable amount of wind power △ P W and the energy storage system's charge and discharge power △ P ESS ; Determine whether the grid frequency exceeds the wind farm frequency regulation dead zone. If so, calculate the wind farm frequency regulation active power demand △ P ref and frequency deviation △ f ; Determine frequency deviation △ f Is it greater than zero? If so, the wind farm adopts the energy storage priority frequency regulation control strategy; if not, determine whether the grid frequency change rate exceeds the fast frequency regulation threshold K1. If so, the wind farm adopts the energy storage priority frequency regulation control strategy; otherwise, the wind farm adopts the wind turbine priority frequency regulation control strategy.
[0052] If the module / unit integrated in the electronic device 100 is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the process in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory and read-only memory (ROM, Read-Only Memory).
[0053] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.
[0054] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.
[0055] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.
[0056] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.
[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.
Claims
1. A method for coordinated frequency regulation control of wind turbines and energy storage in a wind farm with energy storage, characterized in that: include: Real-time monitoring of grid frequency changes and the operating status of each wind turbine and energy storage system in the wind farm to obtain the adjustable amount of wind power △ P W and the energy storage system's charge and discharge power △ P ESS ; Determine whether the grid frequency exceeds the wind farm frequency regulation dead zone. If so, calculate the wind farm frequency regulation active power demand △ P ref and frequency deviation △ f ; Determine frequency deviation △ f Is it greater than zero? If so, the wind farm adopts the energy storage priority frequency regulation control strategy; if not, determine whether the grid frequency change rate exceeds the fast frequency regulation threshold K1. If so, the wind farm adopts the energy storage priority frequency regulation control strategy; otherwise, the wind farm adopts the wind turbine priority frequency regulation control strategy.
2. The method for coordinated frequency regulation control of wind turbines and energy storage in a wind farm with energy storage according to claim 1, characterized in that: The energy storage priority frequency regulation control strategy specifically includes: determining whether the adjustable active power of the energy storage system is greater than the frequency regulation active power demand of the wind farm △ P ref If so, the frequency regulation is independently controlled by the energy storage system, and the frequency regulation power of the energy storage system is equal to △ P ref Otherwise, the energy storage system and wind turbines work together to perform frequency regulation control, and the frequency regulation power of the energy storage system is equal to the chargeable and dischargeable power △ P ESS , the frequency modulation power of the wind turbine is equal to △ P ref -△ P ESS .
3. The method for coordinated frequency regulation control of wind turbines and energy storage in a wind farm with energy storage according to claim 1, characterized in that: The wind turbine priority frequency control strategy specifically includes: determining the wind power active adjustable quantity △ P wt Is it greater than the wind farm frequency regulation active power demand? P ref If so, the wind turbine is independently controlled for frequency regulation, and the frequency regulation power of the wind turbine is equal to △ P ref Otherwise, the energy storage system and the wind turbine will coordinate the frequency regulation control, and the frequency regulation power of the wind turbine will be equal to the adjustable active power of wind power △ P W , the frequency modulation power of the energy storage system is equal to △ P ref -△ P W .
4. The method for coordinated frequency regulation control of wind turbines and energy storage in a wind farm with energy storage according to claim 1, characterized in that: The wind power active adjustable amount △ P W and the energy storage system's charge and discharge power △ P ESS In the step, the wind power active adjustable amount △ is calculated according to formula (1) P wt : （1） Among them: P W is the adjustable amount of wind power active power; P β_i is the variable pitch reserve power of the i-th wind turbine; P J_i is the active adjustable amount of the rotor kinetic energy of the i-th wind turbine; P MPPT_i is the maximum power that can be generated by the i-th wind turbine according to MPPT control; P t_i is the real-time output active power of the i-th wind turbine; J T_i is the moment of inertia of the i-th wind turbine; ω g_i、 ω gend_i are the initial generator speed of the i-th wind turbine and the generator speed after the rotor kinetic energy release is completed; △ t is the rotor kinetic energy support time.
5. The method for coordinated frequency regulation control of wind turbines and energy storage in a wind farm with energy storage according to claim 1, characterized in that: The wind power active adjustable amount △ P W and the energy storage system's charge and discharge power △ P ESS In the step, when the energy storage system is in the charging state, the energy storage system charge and discharge power △ is calculated according to formula (2) P ESS When the energy storage system is in the discharge state, the energy storage system charge and discharge power △ is calculated according to formula (3) P ESS ; （2） （3） Among them: P ESS_C is the available charging power of the energy storage system; P ESS_D is the available discharge power of the energy storage system; n The real-time state of charge in the energy storage system is greater than the allowable lower limit SOC min The total number of energy storage units; m The real-time state of charge in the energy storage system is less than the upper limit SOC max The total number of energy storage units; P Cmax_i 、 P Dmax_i are the maximum charging power and maximum discharging power of the i-th energy storage unit respectively; P t_i is the real-time charging power or discharging power of the i-th energy storage unit; η i is the energy conversion efficiency of the i-th energy storage unit.
6. The method for coordinated frequency regulation control of wind turbines and energy storage in a wind farm with energy storage according to claim 1, characterized in that: The calculation of the wind farm frequency regulation active power demand △ P ref and frequency deviation △ f In the step, the wind farm frequency regulation active power demand △ is calculated according to formula (4) P ref : （4） in: T J is the equivalent inertia time constant of the wind farm; f 、 f n are the actual frequency and rated frequency of the system respectively; P ref1 ,△ P ref2 They are the active power regulation demand of wind farm inertia response and the active power regulation demand of primary frequency regulation respectively; P N is the rated power of the wind farm; K f is the active frequency modulation coefficient of the wind farm.
7. The method for coordinated frequency regulation control of wind turbines and energy storage in a wind farm with energy storage according to claim 6, characterized in that: △ f=ff d ，f d It is the fixed value of the wind farm frequency regulation dead zone.
8. A wind farm wind turbine and energy storage coordinated frequency regulation control device, characterized in that: include: The monitoring module is used to monitor the frequency changes of the power grid and the operating status of each wind turbine and energy storage system in the wind farm in real time, and obtain the adjustable amount of wind power. P W and the energy storage system's charge and discharge power △ P ESS ; The judgment module is used to determine whether the grid frequency exceeds the wind farm frequency regulation dead zone. If so, it calculates the wind farm frequency regulation active power demand △ P ref and frequency deviation △ f ; Control module, used to determine the frequency deviation △ f Is it greater than zero? If so, the wind farm adopts the energy storage priority frequency regulation control strategy; if not, determine whether the grid frequency change rate exceeds the fast frequency regulation threshold K1. If so, the wind farm adopts the energy storage priority frequency regulation control strategy; otherwise, the wind farm adopts the wind turbine priority frequency regulation control strategy.
9. An electronic device, characterized in that: It comprises a processor and a memory, wherein the processor is used to execute a computer program stored in the memory to implement the coordinated frequency regulation control method of wind turbines and energy storage in a wind farm with energy storage as claimed in any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores at least one instruction, and when the at least one instruction is executed by the processor, the method for coordinated frequency regulation control of wind turbines and energy storage in a wind farm with energy storage according to any one of claims 1 to 7 is implemented.