Wind power plant level wind storage collaborative frequency modulation control method and wind power plant control system

Abstract

The invention belongs to the technical field of wind power generation, and particularly relates to a wind power plant level wind storage collaborative frequency modulation control method and a wind power plant control system. In order to overcome the defects that an existing wind storage combined frequency modulation control method is difficult to apply to the actual operation control process of a wind power plant configured with energy storage and obtains a good frequency modulation effect, the invention adopts the following technical scheme: the wind power plant level wind storage combined frequency modulation control method comprises the following steps of: obtaining related operation data required by primary frequency modulation of the wind power plant; judging whether a primary frequency modulation action is triggered; when the primary frequency modulation action is triggered, a primary frequency modulation instruction is sent, and the current operation power of the energy storage system is adjusted; judging whether the wind power plant operates in a limited power mode; when the wind power plant runs in the limited power mode, judging whether the primary frequency modulation action flag bit disappears or not; and performing state judgment after resetting until the whole wind power plant recovers free power generation and the operation power of the energy storage system is zero. The method has the beneficial effect that the quick response of the wind power plant in limited control and free power generation frequency modulation is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind power generation, and in particular relates to a wind farm-level wind-storage coordinated frequency modulation control method and a wind farm control system. Background Art

[0002] In the new power system environment where a high proportion of new energy sources such as wind power and photovoltaic power are connected, the high proportion of new energy penetration increases the difficulty of ensuring the power grid's midday trough consumption and evening peak supply. At the same time, new energy units cannot provide effective rotational inertia and frequency regulation capabilities, which will lead to a reduction in the power system's frequency support and regulation capabilities. In short, the strong volatility, intermittency, seasonality, and difficulty in prediction of new energy sources increase the difficulty of power balance.

[0003] By configuring new energy storage and reasonably determining the scale of energy storage configuration in combination with system needs, it is possible to improve the level of new energy consumption and utilization, capacity support capabilities and grid-related safety performance. In the field of wind power generation, the importance of improving the level of wind power grid-related safety through the synergy of wind power and energy storage has gradually become more prominent.

[0004] There are many solutions for wind-storage combined power generation control, such as CN111371104B-A grid frequency stability control method based on wind-storage combined power generation system, CN111754361B-Energy storage capacity optimization configuration method and computing equipment for wind-storage combined frequency modulation system, CN113098029B-A wind-storage combined frequency modulation control method based on short-term wind power forecasting, etc. However, the existing wind-storage combined frequency modulation control related technologies still have the following defects: (1) Focus on energy storage capacity configuration and ignore energy storage utilization efficiency. Currently, there are many methods and research on optimizing the configuration of wind farms and energy storage capacity, but most solutions focus on a single optimization model, pay attention to the energy storage planning configuration ratio, and ignore the energy storage optimization control method in actual application, resulting in a large number of wind farm energy storage configuration projects in a state of long-term low utilization.

[0005] (2) The optimization model is too single and has great limitations. The wind farm and energy storage power optimization allocation algorithms mentioned in some patents all focus on a single goal, such as minimizing the frequency regulation cost per unit time and maximizing the frequency regulation benefit per unit time, but ignore the variables and constraints in actual operation. In addition, a single optimal goal cannot achieve accurate real-time control, and the time index of frequency regulation is not considered enough.

[0006] (3) Reliance on wind speed prediction or frequency regulation active margin. Some wind farm and energy storage combined frequency regulation control methods rely on the setting of wind farm frequency regulation active margin and high wind speed threshold, or rely on the accuracy of wind speed prediction. Both methods are extreme modes. The former requires the wind farm to maintain frequency regulation active margin for a long time, which will cause the wind farm to be in a state of wind abandonment for a long time and generate a lot of power loss. The latter requires a high accuracy of wind speed prediction. High-accuracy wind speed prediction has high measurement requirements. It is difficult to achieve undisturbed prediction under the control state during actual operation.

[0007] In summary, the existing wind-storage combined frequency regulation control technologies each have their own advantages and disadvantages, but it is difficult to apply them to the actual operation and control of wind farms equipped with energy storage and achieve better frequency regulation effects. Summary of the invention

[0008] In view of the shortcomings of the existing wind-storage joint frequency modulation control method that is difficult to apply to the actual operation control process of a wind farm equipped with energy storage and achieve a good frequency modulation effect, the present invention provides a wind farm-level wind-storage coordinated frequency modulation control method, which satisfies the requirements of fast response and low limited power of the wind farm under restricted control conditions; and the wind-storage coordinated frequency modulation control method that satisfies the requirements of fast response and grid frequency modulation of the wind farm under free power generation conditions. The present invention also provides a wind farm control system that applies this wind farm-level wind-storage coordinated frequency modulation control method.

[0009] To achieve the above object, the present invention adopts the following technical solution: a wind farm-level wind-storage coordinated frequency modulation control method, the wind farm-level wind-storage coordinated frequency modulation control method comprising: Step S1: Obtain relevant operating data required for primary frequency regulation of the wind farm. The relevant operating data includes the current state of charge (SOC) of the energy storage system, the lower limit (SOC) of the energy storage system, and the current state of charge (SOC) of the energy storage system. min 、Energy storage system SOC upper limit SOC max ; Step S2: judging whether to trigger a frequency modulation action according to the acquired relevant operation data; Step S3: after a frequency modulation action is triggered, a frequency modulation instruction is issued to adjust the current operating power of the energy storage system; Step S4, determining whether the wind farm operates in a power-limited mode or a free power generation mode; Step S5: when the wind farm is operating in the power limiting mode, determine whether the primary frequency modulation action flag disappears; Step S6: Perform post-reset status judgment until the entire wind farm resumes free power generation and the operating power of the energy storage system is zero.

[0010] The wind farm-level wind-storage coordinated frequency regulation control method of the present invention performs primary frequency regulation control based on the energy storage reserve capacity and the wind farm regulation margin, optimizes the frequency regulation auxiliary effect, reduces the site wind abandonment loss, and is easy to apply in frequency regulation practice.

[0011] As an improvement, in step S1, the relevant operation data also includes the total installed capacity P e , Current grid connection point frequency f 、Current grid-connected point active power P t 、Current operating power of all wind farm units P wind 、Current energy storage system operating power P b , the grid point frequency exceeds the limit flag F s 、AGC function activation and deactivation flag AGC C 、Wind farm energy management system launch and shutdown flag Wind C , primary frequency modulation action command, AGC command P AGC , wind farm energy management system active power control instruction P wind_C .

[0012] As an improvement, in step S2, if , F s =1, and , then a frequency modulation action is triggered, where f d It is the frequency dead zone of primary frequency modulation action; like , then the energy storage system only participates in wind-storage coordinated auxiliary discharge frequency regulation; like , then the energy storage system only participates in wind-storage collaborative auxiliary charging frequency regulation.

[0013] As an improvement, in step S3, a frequency modulation instruction is:

[0014] Among them, P b is the current operating power of the energy storage system, P t is the current grid-connected point active power, P t_0 The grid-connected power at the time of a frequency modulation action. is a frequency modulation action instruction, P b_min is the maximum charging power of the energy storage system, P b_max is the maximum discharge power of the energy storage system; The auxiliary discharge frequency modulation instruction is: like , P b ≥0,

[0015] like , Pb <0

[0016] The auxiliary charging frequency modulation command is: like , P b ≥0

[0017] like , P b <0 .

[0018] As an improvement, in step S4, If AGC C =1, Wind C =1, , the wind farm operates in the AGC power-limited operation mode; If AGC C =0, Wind C =1, , the wind farm operates in the wind farm energy management system limited power operation mode; If AGC C =1, Wind C =1, , the wind farm operates in the limited power large deviation mode; If AGC C =0, Wind C =0, the wind farm operates in free power generation mode.

[0019] As an improvement, in step S5, if , and F s =0, it is judged that the primary frequency modulation action flag disappears and the primary frequency modulation action is reset.

[0020] As an improvement, in step S6, when a frequency modulation action is reset, like ,or , then the entire field cannot support the output before the frequency modulation action, making ; like ,or , then the current full-field output is greater than the output before the frequency modulation action, making .

[0021] As an improvement, it also includes independent wind-storage coordinated AGC control. Wind-storage coordinated AGC control and primary frequency regulation can be put into operation separately or simultaneously. Wind-storage coordinated AGC control includes: Step S1-1, obtaining relevant operating data required for wind farm wind-storage coordinated AGC control, the relevant operating data includes the total installed capacity P e , the current total active power of the collector line P, the current operating power of all wind farm units P wind 、Current energy storage system operating power P b , the current energy storage system charge state SOC, AGC function on / off flag AGC C 、Wind farm energy management system launch and shutdown flag Wind C 、AGC instruction P AGC , wind farm energy management system active power control instruction P wind_C ; Step S7, determine whether to put into AGC control state, if AGC C =1, Wind C =1, the wind farm is in the AGC control state. If AGC C =0 or Wind C =1, the wind farm is in the AGC control exit state; Step S8: The wind and energy storage coordinated AGC control instruction is:

[0022] Wherein, P(t0) is the wind farm power at the initial moment of receiving the AGC command.

[0023] As an improvement, the wind farm-level wind-storage coordinated frequency regulation control method also includes energy storage power protection control, including: If the current collector active power total P is greater than 80%Pe and SOC< When the emergency charging condition is triggered, the emergency charging power instruction of the energy storage system is automatically generated. The emergency charging instruction is ; When SOC>50%, the emergency charging condition is reset and the emergency charging power command of the energy storage system returns to 0; If the current total active power of the collector line P is less than 20%Pe and SOC> When the emergency discharge condition is triggered, the emergency discharge power instruction of the energy storage system is automatically generated. The emergency discharge instruction is ; When SOC is less than 50%, the emergency discharge condition is reset and the emergency discharge power command of the energy storage system returns to 0; in, Maintain the protection lower limit for the energy storage system. Maintain a protective cap for energy storage systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is an existing wind farm control system architecture diagram.

[0025] Figure 2 It is an architecture diagram of a wind farm-level wind-storage coordinated frequency regulation control system according to an embodiment of the present invention.

[0026] Figure 3 It is a topological diagram of a wind farm-level wind-storage coordinated frequency regulation control system according to an embodiment of the present invention.

[0027] Figure 4 It is a primary frequency regulation information interaction path diagram of a wind farm-level wind-storage coordinated frequency regulation control system in an embodiment of the present invention.

[0028] Figure 5 It is the AGC information interaction path of the wind farm-level wind-storage coordinated frequency regulation control system in an embodiment of the present invention.

[0029] Figure 6 It is a logic diagram of the wind farm-level wind-storage coordinated frequency regulation control method during primary frequency regulation in an embodiment of the present invention.

[0030] Figure 7 It is a logic diagram of the wind farm-level wind-storage coordinated frequency regulation control method under AGC control in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The technical solutions of the embodiments of the present invention are explained and described below, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0032] See also Figure 1 The existing common wind farm control system consists of four parts: the control layer, the station control layer, the unit layer, and the equipment layer. The control layer includes the dispatching master station and its affiliated automation network equipment, and has system functions such as data acquisition and monitoring, automatic generation control (AGC), and automatic voltage control (AVC). The station control layer is the deployment level of the main monitoring system of the wind farm, including wind turbine energy management system, automation integrated system, AGC / AVC system, fast frequency regulation control system, power quality system and other systems and their ancillary equipment. The unit layer includes the wind turbine unit main control, reactive power compensation device and other measurement and control devices to realize the unit system control.

[0033] According to the existing wind farm system composition and the deployment level of the wind farm energy storage system, in the embodiment of the present invention, the energy storage EMS (Energy Management System) and the wind-storage coordinated frequency regulation controller are designed at the station control layer to realize two-way data interaction between the station control layer and the unit layer system, and to realize that the system function does not interfere with the operation of the original wind farm station control system, and can be switched without disturbance. The wind farm-level wind-storage coordinated frequency regulation control system architecture of the embodiment of the present invention is as follows: Figure 2 As shown in the figure, SVG is Static Var Generator, i.e. static var generator.

[0034] The core component of the wind farm-level wind-storage coordinated frequency regulation control system is the wind-storage coordinated controller. To achieve wind farm-level wind-storage coordinated frequency regulation, the wind-storage coordinated controller is deployed at the station control layer as one of the main control devices at the station control layer. The station control layer equipment is based on Ethernet and is networked in a redundant manner. The network structure of the wind farm-level wind-storage coordinated frequency regulation control system is as follows: Figure 3 As shown, each device connected to the station control layer needs to be configured with at least two Ethernet ports, which are connected to the switches of network A and network B respectively.

[0035] Wind-storage coordination controllers A and B realize two-way data interaction with wind turbine energy management system, energy storage EMS, AGC control system, and primary frequency regulation control system through IEC 104 communication. In addition, the wind-storage coordination controller also sends the operation information of the wind farm-level wind-storage coordinated frequency regulation control system to the control layer through RTU (Remote Terminal Unit) and receives the AGC instructions issued. The wind-storage coordination controller needs to exchange network data with the telecontrol device and energy storage EMS in a redundant manner, and the network connection is established between the redundant devices in a cross-connected manner. In addition to the core equipment wind-storage coordination controller, the wind farm-level wind-storage coordinated frequency regulation control system also includes wind-storage coordinated frequency regulation control switches, communication management machines and other equipment.

[0036] The information interaction objects of the wind-storage coordinated frequency regulation control system include the energy storage energy management system, wind farm energy management system, AGC control system and primary frequency regulation control system. The main information interaction paths are: (1) Information interaction path of wind-storage coordinated frequency regulation control system participating in primary frequency regulation: See also Figure 4 , Step 1: The wind-storage coordinated frequency regulation control system has the energy storage assisted primary frequency regulation function, which can be put into operation and can be exited. Put the energy storage assisted primary frequency regulation function into operation and proceed to step 2.

[0037] Step 2: The primary frequency regulation system detects that the frequency deviation of the grid connection point exceeds the dead zone, triggers a primary frequency regulation action, and sends a frequency regulation instruction to the wind farm energy management system and the wind-storage coordinated frequency regulation control system, and proceeds to steps 3 and 4.

[0038] Step 3: The wind farm energy management system receives the frequency regulation command and sends it to the wind turbines in the field according to the allocation control algorithm strategy. At the same time, the wind farm energy management system feeds back the field group operation information to the primary frequency regulation system and the wind-storage coordinated frequency regulation control system.

[0039] Step 4: The wind-storage coordinated frequency control system receives the frequency control command, calculates the energy storage coordinated control demand in real time based on the deviation between the grid connection point power and the frequency control target, the actual output of the wind farm group, the line loss of the entire field and other factors, and sends the energy storage coordinated control command to the energy storage EMS. At the same time, the energy storage EMS feeds back the operation information of the energy storage PCS (Power Conversion System, energy storage converter), BMS (Battery Management System, battery management system) and other operating information to the wind-storage coordinated control system.

[0040] (2) Information interaction path of wind-storage coordinated frequency regulation control system participating in AGC: See also Figure 5 , Step 1: The wind-storage coordinated frequency regulation control system has the energy storage auxiliary AGC function, which can be put into operation and can be exited. Put the energy storage auxiliary AGC (Automatic Generation Control) function into operation and proceed to step 3.

[0041] Step 2: The dispatching agency issues the AGC command, and the station remote control unit (RTU) receives the AGC command and forwards it to the AGC substation system. At the same time, the AGC substation system sends the station AGC related operation information to the dispatching agency through the RTU and enters step 3.

[0042] Step 3: The AGC substation detects that there is a deviation between the AGC instruction issued by the dispatching agency and the active power of the entire field, triggers the AGC action, and issues the active power control instruction of the entire field to the wind farm energy management system and the wind-storage coordinated frequency regulation control system, and proceeds to steps 4 and 5.

[0043] Step 4: The wind farm energy management system receives the active power control command of the entire farm and sends it to the wind turbines in the farm according to the distribution control algorithm strategy. At the same time, the wind farm energy management system feeds back the farm group operation information to the AGC substation and the wind-storage coordinated frequency regulation control system.

[0044] Step 5: The wind-storage coordinated frequency regulation control system receives the active power control command of the entire field, calculates the energy storage coordinated control demand in real time based on the deviation between the active power control command of the entire field and the actual active power of the entire field, the line loss of the entire field and other factors, and sends the energy storage coordinated control command to the energy storage EMS. At the same time, the energy storage EMS feeds back the operation information of the energy storage PCS, BMS, etc. to the wind-storage coordinated control system.

[0045] See also Figure 6 , a wind farm-level wind-storage coordinated frequency modulation control method according to an embodiment of the present invention, the wind farm-level wind-storage coordinated frequency modulation control method comprising: Step S1: Obtain relevant operating data required for primary frequency regulation of the wind farm. The relevant operating data includes the current state of charge (SOC) of the energy storage system, the lower limit (SOC) of the energy storage system, and the current state of charge (SOC) of the energy storage system. min 、Energy storage system SOC upper limit SOC max ; Step S2: judging whether to trigger a frequency modulation action according to the acquired relevant operation data; Step S3: after a frequency modulation action is triggered, a frequency modulation instruction is issued to adjust the current operating power of the energy storage system; Step S4: determining whether the wind farm is operating in a power limiting mode; Step S5: when the wind farm is operating in the power limiting mode, determine whether the primary frequency modulation action flag disappears; Step S6: Perform post-reset status judgment until the entire wind farm resumes free power generation and the operating power of the energy storage system is zero.

[0046] In this embodiment, in step S1, the relevant operation data also includes the total installed capacity P e , Current grid connection point frequency f 、Current grid-connected point active power P t 、Current operating power of all wind farm units P wind 、Current energy storage system operating power P b , the grid point frequency exceeds the limit flag F s 、AGC function activation and deactivation flag AGC C 、Wind farm energy management system launch and shutdown flag Wind C , One-time frequency modulation action instruction 、AGC instruction P AGC , wind farm energy management system active power control instruction P wind_C .

[0047] In this embodiment, in step S2, if , F s =1, and , then a frequency modulation action is triggered, where f d It is the frequency dead zone of primary frequency modulation action; like , then the energy storage system participates in wind-storage coordinated auxiliary discharge frequency regulation; like , the energy storage system participates in wind-storage collaborative auxiliary charging and frequency regulation.

[0048] In this embodiment, in step S3, a frequency modulation instruction is:

[0049] Among them, P b is the current operating power of the energy storage system, P t is the current grid-connected point active power, P t_0 The grid-connected power at the time of a frequency modulation action. is a frequency modulation action instruction, P b_max is the maximum discharge power of the energy storage system, P b_min is the maximum charging power of the energy storage system; The auxiliary discharge frequency modulation instruction is: like , P b ≥0,

[0050] like , P b <0

[0051] The auxiliary charging frequency modulation command is: like , P b ≥0

[0052] like , P b <0 .

[0053] In this embodiment, in step S4, If AGC C =1, Wind C =1, , the wind farm operates in the AGC power-limited operation mode; If AGC C =0, Wind C =1, , the wind farm operates in the wind farm energy management system limited power operation mode; If AGC C =1, Wind C =1, , the wind farm operates in the limited power large deviation mode; If AGC C =0, Wind C =0, the wind farm operates in free power generation mode.

[0054] In this embodiment, in step S5, if , and F s =0, it is judged that the primary frequency modulation action flag disappears and the primary frequency modulation action is reset.

[0055] In this embodiment, in step S6, when a frequency modulation action is reset, like ,or , then the entire field cannot support the output before the frequency modulation action, making the next moment (interval )The operating power of the energy storage system is:

[0056] like ,or , then the current full-field output is greater than the output before the frequency modulation action, so that the next moment (interval )The operating power of the energy storage system is: Until the whole field resumes free power generation, and . is the operating power of the energy storage system at the moment when a frequency modulation command is received, is the operating power of the energy storage system at the current time t, for The operating power of the energy storage system at all times.

[0057] When t is a subscript, it indicates the active power of the grid connection point, such as the current active power of the grid connection point Pt, and the active power of the grid connection point Pt_0 at the time of the primary frequency modulation action. When t is not a subscript and appears in brackets, it indicates the current moment, such as the current active power of the grid connection point Pt(t) (same meaning as Pt), the operating power of the energy storage system at the current moment t .

[0058] See also Figure 7 In this embodiment, the wind farm-level wind-storage coordinated frequency regulation control method further includes independent wind-storage coordinated AGC control, and the wind-storage coordinated AGC control includes: Step S1-1, real-time acquisition of relevant operating data required for wind farm wind-storage coordinated AGC control, the relevant operating data mainly includes the total installed capacity P e , the current total active power of the collector line P, the current operating power of all wind farm units P wind 、Current energy storage system operating power P b , the current energy storage system charge state SOC, AGC function on / off flag AGC C 、Wind farm energy management system launch and shutdown flag Wind C 、AGC instruction P AGC , wind farm energy management system active power control instruction P wind_C ; Step S7, determine whether to put into AGC control state, if AGC C =1, Wind C =1, the wind farm is in the AGC control state. If AGC C =0 or Wind C =1, the wind farm is in the AGC control exit state; Step S8: The wind and energy storage coordinated AGC control instruction is:

[0059] Among them, P(t0) represents the wind farm power at the moment of receiving the AGC command, and P(t) represents the total active power of the collector at the current moment t.

[0060] Thus, the response speed of AGC control instructions is improved while the wind abandonment losses at the site are reduced.

[0061] In this embodiment, the wind farm-level wind-storage coordinated frequency regulation control method further includes energy storage power protection control, and the energy storage power protection control includes: If the total load is greater than 80%Pe and SOC< When the emergency charging condition is triggered, the emergency charging power instruction of the energy storage system is automatically generated. The emergency charging instruction is: ; When SOC>50%, the emergency charging condition is reset and the emergency charging power command of the energy storage system returns to 0; If the total load is less than 20%Pe and SOC> When the emergency discharge condition is triggered, the emergency discharge power instruction of the energy storage system is automatically generated. The emergency discharge instruction is ; When SOC is less than 50%, the emergency discharge condition is reset and the emergency discharge power command of the energy storage system returns to 0; in, Maintain the protection lower limit for the energy storage system. Maintain a protective cap for energy storage systems.

[0062] The field-level wind-storage coordinated frequency regulation control method of the embodiment of the present invention realizes wind-storage coordinated frequency regulation control that meets the requirements of fast response and low restricted power of the wind farm under restricted control conditions; realizes wind-storage coordinated frequency regulation control that meets the requirements of fast response and grid frequency regulation of the wind farm under free power generation conditions; proposes a primary frequency regulation control method based on energy storage reserve capacity and wind farm regulation margin; proposes an AGC control method based on energy storage reserve capacity and wind farm regulation margin; and is a primary frequency regulation and secondary frequency regulation (AGC) coordinated control method based on dynamic evaluation of wind storage regulation performance.

[0063] The embodiment of the present invention also provides a wind farm control system, which adopts the above-mentioned wind farm-level wind-storage coordinated frequency regulation control method, and the wind farm control system includes: The control layer includes the dispatching master station and dispatching switch; The station control layer includes the wind turbine monitoring system, AGC system, AVC system, primary frequency regulation control system, core switch, energy storage EMS and wind-storage coordinated frequency regulation controller; The unit layer includes wind turbine main control, energy storage PCS, energy storage BMS and measurement and control devices; The equipment layer includes wind turbines, converters, transformers and circuit breakers; Among them, the equipment in the station control layer is based on Ethernet and is networked in a redundant manner; Each device connected to the station control layer is equipped with at least two Ethernet ports, which are connected to the switches of network A and network B respectively; Among them, the two wind-storage coordination controllers realize two-way data interaction with the wind turbine energy management system, energy storage EMS, AGC control system, and primary frequency regulation control system through IEC 104 communication; Among them, the wind-storage coordination controller also transmits the operation information of the wind farm-level wind-storage coordinated frequency regulation control system to the control layer and receives the AGC instructions issued; Among them, the wind-storage coordination controller exchanges network data with the telecontrol device and energy storage EMS in a redundant manner, and network connections are established between redundant devices in a cross manner.

[0064] The wind farm control system of the embodiment of the present invention realizes two-way data interaction and real-time control between the wind farm-level wind power control system and the energy storage management system, and ultimately achieves rapid response and grid frequency regulation requirements.

[0065] The above is only a specific implementation of the invention, but the protection scope of the invention is not limited thereto. Those skilled in the art should understand that the invention includes but is not limited to the contents described in the above specific implementation. Any modification that does not deviate from the functional and structural principles of the invention will be included in the scope of the claims.

Claims

1. A wind farm-level wind-storage coordinated frequency modulation control method, characterized in that: The wind farm-level wind-storage coordinated frequency regulation control method comprises: Step S1: Obtain relevant operating data required for primary frequency regulation of the wind farm. The relevant operating data includes the current state of charge (SOC) of the energy storage system, the lower limit (SOC) of the energy storage system, and the current state of charge (SOC) of the energy storage system. min 、Energy storage system SOC upper limit SOC max ; Step S2: determining whether to trigger a frequency modulation action according to the acquired relevant operation data; Step S3: after a frequency modulation action is triggered, a frequency modulation instruction is issued to adjust the current operating power of the energy storage system; Step S4, determining whether the wind farm operates in a power-limited mode or a free power generation mode; Step S5: when the wind farm is operating in the power limiting mode, determine whether the primary frequency modulation action flag disappears; Step S6: Perform post-reset status judgment until the entire wind farm resumes free power generation and the operating power of the energy storage system is zero.

2. The wind farm-level wind-storage coordinated frequency modulation control method according to claim 1 is characterized in that: In step S1, the relevant operation data also includes the total installed capacity P e , Current grid connection point frequency f 、Current grid-connected point active power P t 、Current operating power of all wind farm units P wind 、Current energy storage system operating power P b , the grid point frequency exceeds the limit flag F s 、AGC function activation and deactivation flag AGC C 、Wind farm energy management system launch and shutdown flag Wind C , One-time frequency modulation action instruction 、AGC instruction P AGC , wind farm energy management system active power control instruction P wind_C .

3. The wind farm-level wind-storage coordinated frequency modulation control method according to claim 2 is characterized in that: In step S2, if , F s =1, and , then a frequency modulation action is triggered, where f d It is the frequency dead zone of primary frequency modulation action; like , then the energy storage system only participates in wind-storage coordinated auxiliary discharge frequency regulation; like , then the energy storage system only participates in wind-storage collaborative auxiliary charging frequency regulation.

4. The wind farm-level wind-storage coordinated frequency modulation control method according to claim 3 is characterized in that: In step S3, a frequency modulation instruction is: Among them, P b is the current operating power of the energy storage system, P t is the current grid-connected point active power, P t_0 The grid-connected power at the time of a frequency modulation action. is a frequency modulation action instruction, P b_max is the maximum discharge power of the energy storage system, P b_min is the maximum charging power of the energy storage system; The auxiliary discharge frequency modulation instruction is: like , P b ≥0, like , P b <0 The auxiliary charging frequency modulation command is: like , P b ≥0 like , P b <0 。 5. The wind farm-level wind-storage coordinated frequency modulation control method according to claim 3 is characterized in that: In step S4, If AGC C =1, Wind C =1, , the wind farm operates in the AGC power-limited operation mode; If AGC C =0, Wind C =1, , the wind farm operates in the wind farm energy management system limited power operation mode; If AGC C =1, Wind C =1, , the wind farm operates in the limited power large deviation mode; If AGC C =0, Wind C =0, the wind farm operates in free power generation mode.

6. The wind farm-level wind-storage coordinated frequency modulation control method according to claim 5 is characterized in that: In step S5, if , and F s =0, it is judged that the primary frequency modulation action flag disappears and the primary frequency modulation action is reset.

7. The wind farm-level wind-storage coordinated frequency modulation control method according to claim 6 is characterized in that: In step S6, when the frequency modulation action is reset, like ,or , then the entire field cannot support the output before the frequency modulation action, making like ,or , then the current full-field output is greater than the output before the frequency modulation action, making 。 8. The wind farm-level wind-storage coordinated frequency modulation control method according to claim 1 is characterized in that: It also includes independent wind-storage collaborative AGC control, which includes: Step S1-1, obtaining relevant operating data required for wind farm wind-storage coordinated AGC control, the relevant operating data includes the total installed capacity P e , the current total active power of the collector line P, the current operating power of all wind farm units P wind 、Current energy storage system operating power P b , the current energy storage system charge state SOC, AGC function on / off flag AGC C 、Wind farm energy management system launch and shutdown flag Wind C 、AGC instruction P AGC , wind farm energy management system active power control instruction P wind_C ; Step S7, determine whether to put into AGC control state, if AGC C =1, Wind C =1, the wind farm is in the AGC control state. If AGC C =0 or Wind C =1, the wind farm is in the AGC control exit state; Step S8: The wind and energy storage coordinated AGC control instruction is: Wherein, P(t0) is the wind farm power at the moment when the AGC command is received.

9. The wind farm-level wind-storage coordinated frequency modulation control method according to claim 8 is characterized in that: The wind farm-level wind-storage coordinated frequency regulation control method also includes energy storage power protection control, which includes: If the current collector active power total P is greater than 80%Pe and SOC< When the emergency charging condition is triggered, the emergency charging power instruction of the energy storage system is automatically generated. The emergency charging instruction is ； When SOC>50%, the emergency charging condition is reset and the emergency charging power command of the energy storage system returns to 0; If the current total active power of the collector line P is less than 20%Pe and SOC> When the emergency discharge condition is triggered, the emergency discharge power instruction of the energy storage system is automatically generated. The emergency discharge instruction is ； When SOC is less than 50%, the emergency discharge condition is reset and the emergency discharge power command of the energy storage system returns to 0; in, Maintain the protection lower limit for the energy storage system. Maintain a protective cap for energy storage systems.

10. A wind farm control system, adopting the wind farm-level wind-storage coordinated frequency modulation control method according to any one of claims 1 to 9, characterized in that: The wind farm control system comprises: The control layer includes the dispatching master station and dispatching switch; The station control layer includes the wind turbine monitoring system, AGC system, AVC system, primary frequency regulation control system, core switch, energy storage EMS system and wind-storage coordinated frequency regulation controller; The unit layer includes wind turbine main control, energy storage PCS, energy storage BMS and measurement and control devices; The equipment layer includes wind turbines, converters, transformers and circuit breakers; Among them, the equipment in the station control layer is based on Ethernet and is networked in a redundant manner; Each device connected to the station control layer is equipped with at least two Ethernet ports, which are connected to the switches of network A and network B respectively; Among them, the two wind-storage coordination controllers realize two-way data interaction with the wind turbine energy management system, energy storage EMS system, AGC control system, and primary frequency regulation control system through IEC 104 communication; Among them, the wind-storage coordination controller also transmits the operation information of the wind farm-level wind-storage coordinated frequency regulation control system to the control layer and receives the AGC instructions issued; Among them, the wind-storage coordination controller exchanges network data with the telecontrol device and energy storage EMS in a redundant manner, and network connections are established between redundant devices in a cross manner.

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