Wind farm-level wind-storage coordinated frequency regulation control method and wind farm control system

Abstract

The present invention belongs to the technical field of wind power generation, and particularly relates to a wind farm-level wind energy storage collaborative frequency modulation control method and a wind farm control system. Aiming at the deficiency that the existing wind energy storage combined frequency modulation control method is difficult to be applied to the actual operation control process of a wind farm equipped with energy storage and achieve a good frequency modulation effect, the present invention adopts the following technical solutions: The wind farm-level wind energy storage collaborative frequency modulation control method includes: obtaining relevant operation data required for primary frequency modulation of the wind farm; judging whether a primary frequency modulation action is triggered; when the primary frequency modulation action is triggered, sending a primary frequency modulation instruction to adjust the current operation power of the energy storage system; judging whether the wind farm is operating in a power limit mode; when the wind farm is operating in a power limit mode, judging whether the primary frequency modulation action flag bit disappears; performing a judgment on the restored state until the entire wind farm resumes free power generation and the operation power of the energy storage system is zero. The beneficial effect of the present invention is: realizing the rapid response of the wind farm in restricted control and free power generation frequency modulation.

Description

Technical Field

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

[0002] In the environment of a new power system with a high proportion of new energy sources such as wind power and photovoltaic power, the high proportion of penetration of new energy sources increases the difficulty of ensuring the consumption of new energy during the low valley at noon and ensuring the supply during the peak at night in the power grid. At the same time, new energy units cannot provide effective moment of inertia and frequency modulation capabilities, which will lead to a reduction in the frequency support and regulation capabilities of the power system. In short, the characteristics of strong volatility, intermittency, seasonality, and large prediction difficulty of new energy sources increase the difficulty of power balance.

[0003] By configuring new energy storage and reasonably determining the energy storage configuration scale in combination with system requirements, the utilization level of new energy consumption, capacity support capabilities, and grid-connected safety performance can be improved. In the field of wind power generation, the importance of improving the grid-connected safety level of wind power through wind power storage collaboration has gradually emerged.

[0004] Currently, there are already many control schemes for wind power storage combined power generation, such as CN111371104B - A grid frequency stability control method based on a wind power storage combined power generation system, CN111754361B - An energy storage capacity optimization configuration method and computing device for a wind power storage combined frequency modulation system, CN113098029B - A wind power storage combined frequency modulation control method based on short-term wind power prediction, etc. However, the existing technologies related to wind power storage combined frequency modulation control still have the following defects:

[0005] (1) Focus on energy storage capacity configuration and ignore the utilization efficiency of energy storage. Currently, there are many methods and studies on the optimization configuration of wind farm and energy storage capacity, but most of the schemes focus on a single optimization model, emphasize the proportion of energy storage planning configuration, and ignore the energy storage optimization control method in actual application, resulting in a long-term low utilization rate of a large number of wind farm energy storage configuration projects.

[0006] (2) The optimization model is too single and has great limitations. The wind farm and energy storage power optimization distribution algorithms mentioned in some patents all focus on a single goal, such as minimizing the frequency modulation cost per unit time and maximizing the frequency modulation benefit per unit time, but ignore the variables and constraints in actual operation, and the single optimal goal cannot achieve precise real-time control, and insufficient consideration is given to the time index of frequency modulation.

[0007] (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.

[0008] 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

[0009] 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.

[0010] 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:

[0011] 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 ;

[0012] Step S2: judging whether to trigger a frequency modulation action according to the acquired relevant operation data;

[0013] 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;

[0014] Step S4, determining whether the wind farm operates in a power-limited mode or a free power generation mode;

[0015] Step S5: when the wind farm is operating in the power limiting mode, determine whether the primary frequency modulation action flag disappears;

[0016] 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.

[0017] 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 regulation margin of the wind farm, optimizes the frequency regulation assistance effect, reduces the wind curtailment loss of the power station, and is easy to apply in frequency regulation practice.

[0018] As an improvement, in step S1, the relevant operation data further includes the total installed capacity P of the whole field e 、the current grid connection point frequency f 、the current active power P of the grid connection point t 、the current operating power P of all the units in the wind farm wind 、the current operating power P of the energy storage system b 、the grid connection point frequency over-limit flag bit F s 、the AGC function on / off flag bit AGC C 、the wind farm energy management system on / off flag bit Wind C 、the primary frequency regulation action instruction, the AGC instruction P AGC 、the active power control instruction P of the wind farm energy management system wind_C 。

[0019] As an improvement, in step S2, if ,F s = 1, and ,then the primary frequency regulation action is triggered, where f d is the primary frequency regulation action frequency dead zone;

[0020] If ,then the energy storage system only participates in the wind-storage coordinated auxiliary discharge frequency regulation;

[0021] If ,then the energy storage system only participates in the wind-storage coordinated auxiliary charge frequency regulation.

[0022] As an improvement, in step S3, the primary frequency regulation instruction is:

[0023]

[0024] Among them, P b is the current operating power of the energy storage system, P t is the current active power of the grid connection point, P t_0 is the grid connection point power at the moment of primary frequency regulation action, is the primary frequency regulation 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;

[0025] The auxiliary discharge frequency regulation instruction is:

[0026] If ,Pb ≥ 0,

[0027]

[0028] If , P b < 0

[0029]

[0030] The auxiliary charging frequency modulation command is:

[0031] If , P b ≥ 0

[0032]

[0033] If , P b < 0

[0034] .

[0035] As an improvement, in step S4,

[0036] If AGC C = 1, Wind C = 1, , then the wind farm operates in the AGC limited power operation mode;

[0037] If AGC C = 0, Wind C = 1, , then the wind farm operates in the wind farm energy management system limited power operation mode;

[0038] If AGC C = 1, Wind C = 1, , then the wind farm operates in the limited power large deviation mode;

[0039] If AGC C = 0, Wind C = 0, then the wind farm operates in the free power generation mode.

[0040] As an improvement, in step S5, if , and F s = 0, then it is determined that the primary frequency modulation action flag bit disappears and the primary frequency modulation action is restored.

[0041] As an improvement, in step S6, when the primary frequency modulation action is restored,

[0042] If , or , then the current full - field cannot support the output before the frequency modulation action, so that

[0043] ;

[0044] If , or , then the current full - field output is greater than the output before the frequency modulation action, so that

[0045] .

[0046] As an improvement, it also includes independent wind - storage collaborative AGC control. The wind - storage collaborative AGC control and primary frequency modulation can be put into operation separately or simultaneously. The wind - storage collaborative AGC control includes:

[0047] Step S1 - 1, obtain the relevant operation data required for the wind - storage collaborative AGC control of the wind farm. The relevant operation data includes the full - field installed capacity P e , the current total active power addition of the collector line P, the current operating power P of all the units in the wind farm wind , the current operating power P of the energy storage system b , the current state of charge SOC of the energy storage system, the AGC function on - off flag bit AGC C , the wind farm energy management system on - off flag bit Wind C , the AGC command P AGC , the active power control command P of the wind farm energy management system wind_C ;

[0048] Step S7, determine whether the AGC control state is put into operation. If AGC C = 1 and Wind C = 1, then the wind farm is in the AGC control - on state. If AGC C = 0 or Wind C = 1, then the wind farm is in the AGC control - off state;

[0049] Step S8, the wind - storage collaborative AGC control command is:

[0050]

[0051] Among them, P(t0) is the power of the wind farm at the initial moment when the AGC command is received.

[0052] As an improvement, the wind - farm - level wind - storage collaborative frequency modulation control method also includes energy storage power protection control, including:

[0053] If the current total active power addition P of the collector line is greater than 80%Pe and SOC < , the emergency charging condition is triggered, and an emergency charging power command for the energy storage system is automatically generated. The emergency charging command is

[0054] ;

[0055] When the SOC > 50%, reset the emergency charging condition, and the emergency charging power command of the energy storage system returns to 0;

[0056] If the total active power addition P of the current collector line is less than 20%Pe and SOC > When, trigger the emergency discharge condition, automatically generate the emergency discharge power command of the energy storage system, and the emergency discharge command is

[0057] ;

[0058] When the SOC < 50%, reset the emergency discharge condition, and the emergency discharge power command of the energy storage system returns to 0;

[0059] Among them, is the lower limit of the maintenance and protection of the energy storage system, is the upper limit of the maintenance and protection of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 is a schematic diagram of an existing wind farm control system architecture.

[0061] Figure 2 is a schematic diagram of the architecture of the wind farm-level wind-storage coordinated frequency regulation control system according to the embodiment of the present invention.

[0062] Figure 3 is a topology diagram of the wind farm-level wind-storage coordinated frequency regulation control system according to the embodiment of the present invention.

[0063] Figure 4 is a diagram of the primary frequency regulation information interaction path of the wind farm-level wind-storage coordinated frequency regulation control system according to the embodiment of the present invention.

[0064] Figure 5 is the AGC information interaction path of the wind farm-level wind-storage coordinated frequency regulation control system according to the embodiment of the present invention.

[0065] Figure 6 is a logic diagram of the primary frequency regulation of the wind farm-level wind-storage coordinated frequency regulation control method according to the embodiment of the present invention.

[0066] Figure 7 is a logic diagram of the AGC control of the wind farm-level wind-storage coordinated frequency regulation control method according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0067] The technical solutions of the embodiments of the present invention will be explained and described below. However, the following embodiments are only the preferred embodiments of the present invention, not all of them. Based on the embodiments in the implementation manners, other embodiments obtained by those skilled in the art without creative efforts all belong to the protection scope of the present invention.

[0068] See Figure 1 , the existing common wind farm control system consists of four parts: the regulation layer, the station control layer, the unit layer, and the equipment layer. The regulation 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 main monitoring system deployment level of the wind farm, including the fan energy management system, the integrated automation system, the AGC / AVC system, the fast frequency modulation control system, the power quality system and other systems and their affiliated equipment. The unit layer includes the main control of the wind turbine, the reactive power compensation device and other measurement and control devices to realize the subsystem control of the unit.

[0069] According to the composition of the existing wind farm system and combining with the deployment level of the energy storage system configured in the wind farm, in the embodiments of the present invention, the energy storage EMS (Energy Management System) and the wind-storage coordinated frequency modulation controller are designed at the station control layer to achieve two-way data interaction with the systems at the station control layer and the unit layer, and to ensure that the system functions do not interfere with the operation of the original wind farm station control system and can be switched without disturbance. The architecture of the wind farm-level wind-storage coordinated frequency modulation control system in the embodiments of the present invention is as Figure 2 shown. In the figure, SVG is the Static Var Generator, that is, the static var generator.

[0070] The core component of the wind farm-level wind-storage coordinated frequency modulation control system is the wind-storage coordination controller. To achieve wind farm-level wind-storage coordinated frequency modulation, the wind-storage coordination controller is deployed at the station control layer and serves as one of the main control devices at the station control layer. The station control layer devices are networked redundantly based on Ethernet. The network structure of the wind farm-level wind-storage coordinated frequency modulation control system is as Figure 3 shown. Each device connected to the station control layer needs to be configured with at least 2 Ethernet network interfaces, which are respectively connected to the switches of Network A and Network B.

[0071] The wind-storage coordinated controllers A and B achieve two-way data interaction with the wind turbine energy management system, energy storage EMS, AGC control system, and primary frequency modulation control system through IEC 104 communication. In addition, the wind-storage coordinated controller also sends the operation information of the wind farm-level wind-storage coordinated frequency modulation control system to the regulation layer through RTU (Remote Terminal Unit) and receives the issued AGC commands. The wind-storage coordinated controller needs to perform network data interaction with the telecontrol device and energy storage EMS in a redundant manner, and the redundant devices establish network connections in a cross manner. In addition to the core device, the wind-storage coordinated controller, the wind farm-level wind-storage coordinated frequency modulation control system also includes devices such as the wind-storage coordinated frequency modulation control switch and communication management machine.

[0072] The information interaction objects of the wind-storage coordinated frequency modulation control system include the energy storage energy management system, wind farm energy management system, AGC control system, and primary frequency modulation control system. The main information interaction paths are as follows:

[0073] (1) Information interaction path for the wind-storage coordinated frequency modulation control system to participate in primary frequency modulation:

[0074] See Figure 4 , Step 1: The wind-storage coordinated frequency modulation control system has the function of energy storage-assisted primary frequency modulation, and the function can be enabled or disabled. When the energy storage-assisted primary frequency modulation function is enabled, go to Step 2.

[0075] Step 2: The primary frequency modulation system detects that the grid connection point frequency deviation exceeds the dead zone, triggers the primary frequency modulation action, and issues frequency modulation commands to the wind farm energy management system and the wind-storage coordinated frequency modulation control system, and enters Steps 3 and 4.

[0076] Step 3: The wind farm energy management system receives the frequency modulation command and issues the frequency modulation command to the on-site wind turbines according to the distribution control algorithm strategy. At the same time, the wind farm energy management system feeds back the field group operation information to the primary frequency modulation system and the wind-storage coordinated frequency modulation control system.

[0077] Step 4: The wind-storage coordinated frequency modulation control system receives the frequency modulation command, calculates the energy storage coordination control requirements in real time according to factors such as the deviation between the grid connection point power and the frequency modulation target, the actual output of the wind farm group, and the full-field line loss, and issues the energy storage coordination 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), BMS (Battery Management System), etc. to the wind-storage coordinated control system.

[0078] (2) Information interaction path for the wind-storage coordinated frequency modulation control system to participate in AGC:

[0079] SeeFigure 5 Step 1: The wind-storage coordinated frequency regulation control system has the function of energy storage-assisted AGC, and this function can be enabled or disabled. Enabling the energy storage-assisted AGC (Automatic Generation Control) function enters Step 3.

[0080] Step 2: The dispatching agency issues an AGC instruction, and the substation remote terminal unit (RTU) of the power station receives the AGC instruction and forwards it to the AGC substation system. At the same time, the AGC substation system sends the relevant operation information of the power station AGC to the dispatching agency through the RTU and enters Step 3.

[0081] Step 3: The AGC substation detects a deviation between the AGC instruction issued by the dispatching agency and the total active power of the whole station, triggers the AGC action, and issues a total active power control instruction to the wind farm energy management system and the wind-storage coordinated frequency regulation control system, and enters Steps 4 and 5.

[0082] Step 4: The wind farm energy management system receives the total active power control instruction and issues the instruction to the on-site wind turbines according to the distribution control algorithm strategy. At the same time, the wind farm energy management system feeds back the operation information of the farm group to the AGC substation and the wind-storage coordinated frequency regulation control system.

[0083] Step 5: The wind-storage coordinated frequency regulation control system receives the total active power control instruction, calculates the energy storage coordination control requirement in real time according to the deviation between the total active power control instruction and the actual total active power of the whole station, the total line loss of the whole station and other factors, and issues the energy storage coordination control instruction 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 coordination control system.

[0084] See Figure 6 , for the wind farm-level wind-storage coordinated frequency regulation control method of the embodiment of the present invention, the wind farm-level wind-storage coordinated frequency regulation control method includes:

[0085] Step S1, obtain relevant operation data required for primary frequency regulation of the wind farm, and the relevant operation data includes the current state of charge SOC of the energy storage system, the lower limit SOC of the energy storage system SOC min , the upper limit SOC of the energy storage system SOC max ;

[0086] Step S2, judge whether to trigger the primary frequency regulation action according to the obtained relevant operation data;

[0087] Step S3, when the primary frequency regulation action is triggered, issue a primary frequency regulation instruction to adjust the current operating power of the energy storage system;

[0088] Step S4, judge whether the wind farm is operating in the power limit mode;

[0089] Step S5: When the wind farm operates in the power limit mode, determine whether the primary frequency regulation action flag bit disappears;

[0090] Step S6: Perform a return state judgment until the entire wind farm resumes free power generation and the operating power of the energy storage system is zero.

[0091] In this embodiment, in step S1, the relevant operating data further includes the total installed capacity P of the whole field e 、the current grid connection point frequency f 、the current active power P of the grid connection point t 、the current operating power P of all the units in the wind farm wind 、the current operating power P of the energy storage system b 、the grid connection point frequency over-limit flag bit F s 、the AGC function on / off flag bit AGC C 、the wind farm energy management system on / off flag bit Wind C 、the primary frequency regulation action instruction 、the AGC instruction P AGC 、the active power control instruction P of the wind farm energy management system wind_C 。

[0092] In this embodiment, in step S2, if ,F s =1, and ,then trigger the primary frequency regulation action, where f d is the primary frequency regulation action frequency dead zone;

[0093] If ,then the energy storage system participates in the wind-storage collaborative auxiliary discharge frequency regulation;

[0094] If ,then the energy storage system participates in the wind-storage collaborative auxiliary charge frequency regulation.

[0095] In this embodiment, in step S3, the primary frequency regulation instruction is:

[0096]

[0097] Wherein, P b is the current operating power of the energy storage system, P t is the current active power of the grid connection point, P t_0 is the grid connection point power at the moment of primary frequency regulation action, is the primary frequency regulation action instruction, P b_max is the maximum discharge power of the energy storage system, P b_min is the maximum charge power of the energy storage system;

[0098] The auxiliary discharge frequency regulation instruction is:

[0099] If , P b ≥0,

[0100]

[0101] If , P b <0

[0102]

[0103] The auxiliary charging frequency modulation command is:

[0104] If , P b ≥0

[0105]

[0106] If , P b <0

[0107] .

[0108] In this embodiment, in step S4,

[0109] If AGC C =1, Wind C =1, , then the wind farm operates in the AGC power limit operation mode;

[0110] If AGC C =0, Wind C =1, , then the wind farm operates in the power limit operation mode of the wind farm energy management system;

[0111] If AGC C =1, Wind C =1, , then the wind farm operates in the large power deviation mode of power limit;

[0112] If AGC C =0, Wind C =0, then the wind farm operates in the free power generation mode.

[0113] In this embodiment, in step S5, if , and F s =0, then it is determined that the primary frequency modulation action flag bit disappears and the primary frequency modulation action is restored.

[0114] In this embodiment, in step S6, when the primary frequency modulation action is restored,

[0115] If , or , then the current full-field output cannot support the output before the frequency modulation action, so that the operating power of the energy storage system at the next moment (interval ) is:

[0116]

[0117] If , or , then the current full-field output is greater than the output before the frequency modulation action, so that the operating power of the energy storage system at the next moment (interval ) is:

[0118] Until the full field resumes free power generation, and . is the operating power of the energy storage system at the moment of receiving the primary frequency modulation command, is the operating power of the energy storage system at the current moment t, is the operating power of the energy storage system at the moment.

[0119] When t is a subscript, it represents 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 moment of primary frequency modulation action. When t is not a subscript and appears in parentheses, it represents the current moment, such as the current active power of the grid connection point Pt(t) (the same meaning as Pt) and the operating power of the energy storage system at the current moment t .

[0120] See Figure 7 , in this embodiment, the wind farm-level wind-storage coordinated frequency modulation control method further includes an independent wind-storage coordinated AGC control, and the wind-storage coordinated AGC control includes:

[0121] Step S1-1, obtain the relevant operating data required for the wind farm wind-storage coordinated AGC control in real time. The relevant operating data mainly includes the full-field installed capacity P e , the current total active power addition of the collector line P, the current operating power of all the wind farm units P wind , the current operating power of the energy storage system P b , the current state of charge SOC of the energy storage system, the AGC function on / off flag bit AGC C , the wind farm energy management system on / off flag bit Wind C , the AGC command P AGC , the active power control command P of the wind farm energy management system wind_C ;

[0122] Step S7, determine whether the AGC control state is enabled. 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;

[0123] Step S8, the wind-storage coordinated AGC control instruction is:

[0124]

[0125] Among them, P(t0) represents the wind farm power at the moment when the AGC instruction is received, and P(t) represents the total active power summation of the collector line at the current moment t.

[0126] Thus, while improving the response speed of the AGC control instruction, the wind curtailment loss of the station is reduced.

[0127] In this embodiment, the wind farm-level wind-storage coordinated frequency modulation control method further includes energy storage power protection control, and the energy storage power protection control includes:

[0128] If the full-field load is greater than 80%Pe and SOC < When the emergency charging condition is triggered, an emergency charging power instruction for the energy storage system is automatically generated, and the emergency charging instruction is:

[0129] ;

[0130] When SOC > 50%, the emergency charging condition is reset, and the emergency charging power instruction of the energy storage system returns to 0;

[0131] If the full-field load is less than 20%Pe and SOC > When the emergency discharging condition is triggered, an emergency discharging power instruction for the energy storage system is automatically generated, and the emergency discharging instruction is

[0132] ;

[0133] When SOC < 50%, the emergency discharging condition is reset, and the emergency discharging power instruction of the energy storage system returns to 0;

[0134] Among them, is the lower limit of the energy storage system maintenance protection, is the upper limit of the energy storage system maintenance protection.

[0135] The electric field-level wind-storage coordinated frequency regulation control method according to the embodiments of the present invention realizes wind-storage coordinated frequency regulation control that meets fast response and low restricted power under restricted control conditions for a wind farm; realizes wind-storage coordinated frequency regulation control that meets fast response and grid frequency regulation requirements under free power generation conditions for a wind farm; 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 coordinated control method for primary frequency regulation and secondary frequency regulation (AGC) based on dynamic evaluation of wind-storage regulation performance.

[0136] The embodiments of the present invention also provide a wind farm control system that adopts the aforementioned wind farm-level wind-storage coordinated frequency regulation control method. The wind farm control system includes:

[0137] A regulation layer, including a dispatching master station and a dispatching switch;

[0138] A station control layer, including a fan monitoring system, an AGC system, an AVC system, a primary frequency regulation control system, a core switch, an energy storage EMS, and a wind-storage coordinated frequency regulation controller;

[0139] A unit layer, including a wind turbine main control, an energy storage PCS, an energy storage BMS, and a measurement and control device;

[0140] An equipment layer, including a fan, an inverter, a transformer, and a circuit breaker;

[0141] Among them, the devices in the station control layer are networked redundantly based on Ethernet;

[0142] Among them, each device connected to the station control layer is configured with at least 2 Ethernet network interfaces, which are respectively connected to the switches of Network A and Network B;

[0143] Among them, the two wind-storage coordination controllers realize two-way data interaction with the fan energy management system, the energy storage EMS, the AGC control system, and the primary frequency regulation control system through IEC 104 communication;

[0144] Among them, the wind-storage coordination controller also sends the operation information of the wind farm-level wind-storage coordinated frequency regulation control system to the regulation layer and receives the issued AGC instructions;

[0145] Among them, the wind-storage coordination controller performs network data interaction with the telecontrol device and the energy storage EMS redundantly, and the redundant devices establish network connections in a cross manner.

[0146] The wind farm control system according to the embodiments 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 energy management system, and finally meets the requirements of fast response and grid frequency regulation.

[0147] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the content described in the above specific implementation manner. Any modification that does not deviate from the functional and structural principles of the present 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: 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 energy storage system operating power is zero; 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 ; 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; 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 。 2. The wind farm-level wind-storage coordinated frequency modulation control method according to claim 1 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.

3. The wind farm-level wind-storage coordinated frequency modulation control method according to claim 2 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.

4. The wind farm-level wind-storage coordinated frequency modulation control method according to claim 3 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 。 5. 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.

6. The wind farm-level wind-storage coordinated frequency modulation control method according to claim 5 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.

7. 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 6, 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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