A system and method for optimizing allocation of wind farm agc regulation quality

Abstract

The present application relates to a kind of method and system based on small load distribution optimization wind farm AGC regulation quality.The present application designs active power small load distribution strategy based on conventional AGC distribution strategy, and small load command is distributed to single or several wind turbines by logical judgment, to avoid the influence of wind turbine active power regulation dead zone on load regulation, optimize wind farm AGC active power regulation quality.The present application solves the problem that current wind farm AGC does not meet the standard when load regulation amount is small.

Description

Technical Field

[0001] This invention belongs to the field of wind power plant monitoring automation, and in particular, it is a distribution system and method for optimizing the AGC regulation quality of wind farms. Background Technology

[0002] Configuring automatic generation control (AGC) systems in wind farms improves power quality, ensures grid operation safety and stability, and solves problems such as the intermittency and uncertainty of wind power generation.

[0003] Based on the received total station load adjustment target value, AGC obtains the target active power of the currently adjustable equipment (wind turbine group, energy storage device, etc.) through active power control algorithm, and then realizes the adjustment of the total station load through active power closed-loop control.

[0004] In existing technologies, AGC active power allocation strategies mainly include allocation based on regulation capacity, allocation based on regulation margin, and average allocation. However, existing technologies have the following drawbacks:

[0005] When the load target change received by the AGC system is small, the active power command increment of the whole station is distributed among multiple wind turbine units, which may cause the active power distribution increment of the wind turbine units to be less than their own active power regulation dead zone and thus not perform active power regulation.

[0006] The aforementioned problems will cause the station's load adjustment commands to fail to respond quickly and accurately, ultimately resulting in unqualified AGC adjustments and the AGC failing to achieve its control objectives. Summary of the Invention

[0007] To address the aforementioned issues, this invention proposes an allocation system and method for optimizing the AGC (Active Gas Control) regulation quality of wind farms. Based on small load allocation, it avoids the impact of the active power regulation dead zone of wind turbines on load regulation, thereby optimizing the active power regulation quality of wind farm AGC.

[0008] The specific technical solution of the present invention is as follows:

[0009] A distribution system for optimizing the regulation quality of AGC in wind farms includes a distribution unit; the distribution unit determines whether the current regulation is a small load regulation based on the magnitude of the load regulation command received by the AGC.

[0010] If the active power low load regulation strategy is implemented, the distribution unit determines whether the corresponding wind turbine should participate in the low load distribution calculation based on the function activation / deactivation status and operating conditions of each wind turbine unit in the wind turbine group.

[0011] Based on the principle of approximate adjustment margin of the participating wind turbine units, the distribution unit performs active power small load distribution, so that each wind turbine unit is not affected by the active power regulation dead zone, and correctly responds to the active power regulation command to optimize the AGC regulation quality.

[0012] Furthermore, when the load adjustment command received by AGC satisfies equation (1), a non-small load allocation strategy is executed; otherwise, a small load allocation strategy is executed.

[0013] |ΔP|>P set (1)

[0014] ΔP—Increment of active power regulation command for the entire station;

[0015] P set —Active load allocation threshold value.

[0016] Furthermore, a logical judgment is made regarding whether all wind turbine units within the wind turbine group can participate in the allocation of small active loads, as follows:

[0017] The distribution unit first determines the corresponding status signal of the fan:

[0018] ① Whether the communication between the wind turbine and wind turbine group monitoring system, and between the wind turbine group monitoring system and the AGC substation is normal;

[0019] ②Is the active power measurement of the fan normal?

[0020] ③ Whether the fan has malfunctioned;

[0021] ④ Is the fan under maintenance?

[0022] When all four conditions above are met, the output fan AGC activation enable signal is activated. If the AGC function is activated at this time, it is determined whether to participate in the allocation calculation based on the current operating condition of the fan.

[0023] When the small load command increases, if the fan is not in the active power increase lockout state, it can participate in the small load allocation calculation.

[0024] When a small load command is issued, if the fan is not in the active power reduction lockout state, it can participate in the small load allocation calculation.

[0025] Furthermore, within the wind turbine group, wind turbine F i adjustment margin P Xi for:

[0026] Load command increment time: P Xi =|P i max -P i | (2)

[0027] Load command reduction time: P Xi =|P i -P i min | (3)

[0028] P Xi —Fan F i Active power regulation margin;

[0029] P i max —Fan F i The upper limit of effective output;

[0030] P i min —Fan F i The lower limit of meritorious contribution;

[0031] P i —Fan F i The current active power generation value;

[0032] Let n be the number of fans involved in the allocation calculation for a single small load adjustment command, and let F1 be the fan to be allocated. * Its adjustment margin satisfies equation (4). If multiple fans have the same adjustment margin, one can be chosen:

[0033]

[0034] Based on the obtained proposed fan allocation, a judgment is made: if Then all small load command increments will be allocated to wind turbine F1. * ;like Then, after removing the currently assigned fan, continue applying method (4) to sequentially increase the number of assigned fans until the requirement is met. At this point, the small load command increment will be applied to each fan F1 to be allocated. * ...F i * The allocation of active power regulation margin ratio.

[0035] This invention also relates to a method for optimizing the allocation of AGC (Automatic Guided Vehicle) regulation quality in wind farms, comprising the following steps:

[0036] Step (1) Determine whether the current adjustment is a small load adjustment based on the load adjustment command received by the AGC;

[0037] Step (2) If the active small load adjustment strategy is implemented, determine whether the corresponding wind turbines should participate in the small load distribution calculation based on the function activation / deactivation status and operating conditions of each wind turbine unit in the wind turbine group.

[0038] Step (3) Based on the principle of approximating the adjustment margin of the wind turbine units participating in the allocation, the active power small load is allocated so that each wind turbine unit is not affected by the active power adjustment dead zone and correctly responds to the active power adjustment command to optimize the AGC adjustment quality.

[0039] Furthermore, in step (1), when the load adjustment command received by AGC satisfies equation (1), a non-small load allocation strategy is executed; otherwise, a small load allocation strategy is executed.

[0040] |ΔP|>P set (1)

[0041] ΔP—Increment of active power regulation command for the entire station;

[0042] P set —Active load allocation threshold value.

[0043] Furthermore, in step (2), a logical judgment is made on whether all wind turbine units within the wind turbine group can participate in the allocation of small active loads:

[0044] First, determine the corresponding status signal of the fan:

[0045] ① Whether the communication between the wind turbine and wind turbine group monitoring system, and between the wind turbine group monitoring system and the AGC substation is normal;

[0046] ②Is the active power measurement of the fan normal?

[0047] ③ Whether the fan has malfunctioned;

[0048] ④ Is the fan under maintenance?

[0049] When all four conditions above are met, the output fan AGC activation enable signal is activated. If the AGC function is activated at this time, it is determined whether to participate in the allocation calculation based on the current operating condition of the fan.

[0050] When the small load command increases, if the fan is not in the active power increase lockout state, it can participate in the small load allocation calculation.

[0051] When a small load command is issued, if the fan is not in the active power reduction lockout state, it can participate in the small load allocation calculation.

[0052] Furthermore, in step (3), the fan F in the fan group i adjustment margin P Xi for:

[0053] Load command increment time: P Xi =|P i max -P i | (2)

[0054] Load command reduction time: P Xi =|P i -P i min | (3)

[0055] P Xi —Fan F i Active power regulation margin;

[0056] P i max —Fan Fi The upper limit of effective output;

[0057] P i min —Fan F i The lower limit of meritorious contribution;

[0058] P i —Fan F i The current active power generation value.

[0059] Let n be the number of fans involved in the allocation calculation for a single small load adjustment command, and let F1 be the fan to be allocated. * Its adjustment margin satisfies equation (4). If multiple fans have the same adjustment margin, one can be chosen:

[0060]

[0061] Based on the obtained proposed fan allocation, a judgment is made: if Then all small load command increments will be allocated to wind turbine F1. * ;like Then, after removing the currently assigned fan, continue applying method (4) to sequentially increase the number of assigned fans until the requirement is met. At this point, the small load command increment will be applied to each fan F1 to be allocated. * ...F i * The allocation of active power regulation margin ratio.

[0062] The present invention also relates to an electronic device, including a memory, a processor, and a computer program on the memory and executable on the processor, characterized in that: when the processor executes the computer program, it implements the steps of the above-described method.

[0063] The present invention also relates to a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described above.

[0064] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0065] This invention designs a small-load active power allocation strategy based on the traditional AGC allocation strategy. Through logical judgment, it distributes small-load commands to one or several wind turbines, avoiding the impact of wind turbine active power regulation dead zones on load regulation and optimizing the active power regulation quality of wind farm AGC. This invention solves the problem of substandard regulation quality of current wind farm AGC when the load regulation amount is small. Attached Figure Description

[0066] Figure 1 This is a flowchart of the method implemented in the embodiment;

[0067] Figure 2 This is a block diagram illustrating the logic for determining the participation of wind turbines in the allocation of small active loads in this embodiment.

[0068] Figure 3 This is a block diagram of the system in this embodiment. Detailed Implementation

[0069] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Where specific techniques or conditions are not specified in the embodiments, they should be performed in accordance with the techniques or conditions described in the literature in the art or according to the product manual.

[0070] like Figure 1 As shown, this embodiment of the wind farm AGC active power small load allocation method based on wind turbine group optimization is implemented on the wind farm wind turbine group monitoring system and AGC substation, and includes the following steps:

[0071] Step (1) Determine whether the adjustment is a small load adjustment based on the load adjustment command issued by AGC.

[0072] When the load adjustment command received by AGC satisfies equation (1), the non-small load allocation strategy is executed; otherwise, the small load allocation strategy is executed.

[0073] |ΔP|>P set (1)

[0074] ΔP—Increment of active power regulation command for the entire station;

[0075] P set —Active load allocation threshold value.

[0076] Step (2) If the active power low load regulation strategy is implemented, determine whether the corresponding wind turbine should participate in the low load allocation calculation based on the function activation / deactivation status and operating conditions of each wind turbine unit in the wind turbine group:

[0077] Logical judgment is made on whether all wind turbines within the wind turbine group can participate in the distribution of small active loads, such as... Figure 2 As shown.

[0078] First, determine the corresponding status signal of the fan:

[0079] ① The communication between the wind turbine and wind turbine group monitoring system, and between the wind turbine group monitoring system and the AGC substation is normal;

[0080] ②The active power measurement of the fan is normal;

[0081] ③ No fan malfunctions occurred;

[0082] ④ The fan is not in maintenance mode.

[0083] When all four conditions above are met, the AGC (Automatic Guided Vehicle) activation signal for the wind turbine is output. If the AGC function is activated at this time, it is determined whether to participate in the allocation calculation based on the current operating condition of the wind turbine: when the small load command increases, if the wind turbine is not in the active power increase lockout state, it can participate in the small load allocation calculation; when the small load command decreases, if the wind turbine is not in the active power decrease lockout state, it can participate in the small load allocation calculation.

[0084] Step (3) Based on the principle of approximating the adjustment margin of the wind turbine units participating in the allocation, the active power small load is allocated so that each wind turbine unit is not affected by the active power adjustment dead zone and correctly responds to the active power adjustment command to optimize the AGC adjustment quality.

[0085] Fan F in the fan group i adjustment margin P Xi for:

[0086] Load command increment time: P Xi =|P i max -P i | (2)

[0087] Load command reduction time: P Xi =|P i -P i min | (3)

[0088] P Xi —Fan F i Active power regulation margin;

[0089] P i max —Fan F i The upper limit of effective output;

[0090] P i min —Fan F i The lower limit of meritorious contribution;

[0091] P i —Fan F i The current active power generation value.

[0092] Let n be the number of fans involved in the allocation calculation for a single small load adjustment command, and let F1 be the fan to be allocated. * Its adjustment margin satisfies equation (4). If multiple fans have the same adjustment margin, one can be chosen:

[0093]

[0094] Based on the obtained proposed fan allocation, a judgment is made: if Then all small load command increments will be allocated to wind turbine F1. * ;like Then, after removing the currently assigned fan, continue applying method (4) to sequentially increase the number of assigned fans until the requirement is met. At this point, the small load command increment will be applied to each fan F1 to be allocated. * ...F i * The allocation of active power regulation margin ratio.

[0095] like Figure 3 As shown, implementing the above method, the wind farm AGC regulation quality optimization distribution system of this embodiment includes a data collector, a processor, a memory, a display, and an input terminal. The data collector collects the station-wide load regulation commands issued by the AGC system. The processor receives the data collector commands and compares them with the pre-set active power small load allocation threshold value to determine whether to execute the active power small load allocation strategy for the wind turbine group. Based on the status signal feedback of each wind turbine unit in the station's wind turbine group, it determines whether the corresponding unit participates in the active power small load allocation. Based on the current operating conditions of each wind turbine unit participating in the small load allocation, active power small load allocation is performed. By following the above method, the active power output of each wind turbine unit is not affected by the active power regulation dead zone of the unit, correctly responds to the active power regulation commands, and finally achieves the target active power output.

[0096] The memory stores the relevant information, and the display and input terminals can be existing displays with buttons or touch screens.

[0097] The processors mentioned above can be general-purpose processors, including central processing units, network processors, etc.; they can also be digital signal processors, application-specific integrated circuits, field-programmable gate arrays or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0098] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. The computer program product includes one or more computer instructions.

[0099] When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device.

[0100] Computer instructions can be stored in a readable storage medium or transmitted from one readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means (e.g., infrared, wireless, microwave, etc.). The readable storage medium can be any available medium that a computer can access, or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium, an optical medium (e.g., a DVD), or a semiconductor medium, etc.

[0101] Optionally, embodiments of this application also provide a storage medium storing instructions that, when run on a computer, cause the computer to perform the methods described in the above embodiments.

[0102] Optionally, embodiments of this application also provide a chip for executing instructions, the chip being used to execute the methods of the embodiments shown above.

[0103] This application also provides a program product, which includes a computer program stored in a storage medium. At least one processor can read the computer program from the storage medium, and when the at least one processor executes the computer program, it can implement the method of the above embodiments.

[0104] It is understood that, in the embodiments of this application, the order of the above-mentioned process numbers does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0105] After implementing the control strategy, optimization and trial operation are carried out. During the trial operation, all control logic actions are correct and the adjustment effect meets the standards, and the system can be officially put into operation.

[0106] As a specific application example:

[0107] Set a low load distribution threshold value P set =0.6MW.

[0108] The wind farm has 9 doubly-fed induction generator (DFIG) turbines, F1, F2...F9, with a maximum active power output of 2.0MW per unit and an active power regulation dead zone of 0.2MW. Turbine F1 is in a fault state, F2 has a communication interruption, and F5 and F6 are not in AGC (Automatic Guided Collection) mode and therefore do not participate in allocation calculations.

[0109] (i) When the AGC system responds to the load increase command of the entire station, its active power allocation value is ΔP = 0.4MW. Fans F3 and F4 are in the active power increase lockout state and do not participate in the allocation calculation.

[0110] Traditional average allocation strategy: ΔP is evenly allocated to units F7, F8, and F9, with each unit receiving 0.13MW, which is less than the dead zone of active power regulation for a single unit, affecting regulation quality;

[0111] Low-load allocation strategy; the active power adjustable margins of participating units F7, F8, and F9 are respectively P X7 =0.7MW,P X8 =1.0MW,P X9 =0.5MW, then the proposed active power adjustment margin for wind turbines is... because Distributing ΔP to fan F8 allows it to operate correctly.

[0112] (ii) When the AGC system responds to the load reduction command of the entire station, its active power allocation value is ΔP = -0.5MW. Fans F3 and F4 are in the active power reduction lockout state and do not participate in the allocation calculation.

[0113] Traditional average allocation strategy: ΔP is evenly allocated to units F7, F8, and F9, with each unit receiving -0.16MW, which is less than the active power regulation dead zone of a single unit, affecting regulation quality;

[0114] Low-load allocation strategy; the active power adjustable margins of participating units F7, F8, and F9 are respectively P X7 =0.4MW,P X8 =0.4MW,P X9 =0.3MW, then the proposed active power adjustment margin for wind turbines is... because Distributing ΔP to wind turbines F7 and F8 according to the adjustable margin ratio, with an allocation value of -0.25MW for wind turbine F7 and -0.25MW for wind turbine F8, ensures correct operation.

[0115] As can be seen, this invention distributes small load commands to one or several wind turbines through logical judgment, so as to avoid the load regulation being affected by the active power regulation dead zone of the wind turbines, optimize the active power regulation quality of wind farm AGC, and solve the problem that the regulation quality of wind farm AGC is not up to standard when the load regulation amount is small.

[0116] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A distribution system for optimizing the AGC (Automatic Guided Vehicle) regulation quality of a wind farm, characterized in that: Includes an allocation unit; the allocation unit determines whether the current adjustment is a small load adjustment based on the load adjustment command received by the AGC. If the active power low load regulation strategy is implemented, the distribution unit determines whether the corresponding wind turbine should participate in the low load distribution calculation based on the function activation / deactivation status and operating conditions of each wind turbine unit in the wind turbine group. Based on the principle of approximate adjustment margin of the wind turbine units participating in the allocation, the distribution unit performs active power small load allocation, so that each wind turbine unit is not affected by the active power adjustment dead zone, correctly responds to the active power adjustment command, and optimizes the AGC adjustment quality. Fans in the fan group adjustment margin for: Load command increment time: (2) Load command reduction time: (3) —fan Active power regulation margin; —fan The upper limit of effective output; —fan The lower limit of meritorious contribution; —fan The current active power generation value; Let n be the number of fans involved in the allocation calculation for a single small load adjustment command, and let the number of fans to be allocated be n. Its adjustment margin satisfies equation (4). If multiple wind turbines have the same adjustment margin, one of them can be chosen: （4） Based on the obtained proposed fan allocation, a judgment is made: if Then all small load command increments will be allocated to the wind turbines. ;like Then, after removing the currently assigned fan, continue to apply method (4) to sequentially increase the number of assigned fans until the requirement is met. At this point, the small load command increment will be distributed to each fan to be allocated. The allocation of active power regulation margin ratio.

2. The system according to claim 1, characterized in that: When the load adjustment command received by AGC satisfies equation (1), the non-small load allocation strategy is executed; otherwise, the small load allocation strategy is executed. （1） —Incremental amount of active power adjustment commands for the entire station; —Active load allocation threshold value.

3. The system according to claim 1, characterized in that: The logic for determining whether all wind turbines within the wind turbine cluster can participate in the allocation of small active loads is as follows: The distribution unit first determines the corresponding status signal of the fan: ① Whether the communication between the wind turbine and wind turbine group monitoring system, and between the wind turbine group monitoring system and the AGC substation is normal; ②Is the active power measurement of the fan normal? ③ Whether the fan has malfunctioned; ④ Is the fan under maintenance? When all four conditions above are met, the output fan AGC activation enable signal is activated. If the AGC function is activated at this time, it is determined whether to participate in the allocation calculation based on the current operating condition of the fan. When the small load command increases, if the fan is not in the active power increase lockout state, it can participate in the small load allocation calculation. When a small load command is issued, if the fan is not in the active power reduction lockout state, it can participate in the small load allocation calculation.

4. A method for optimizing the allocation of AGC (Automatic Guided Vehicle) regulation quality in wind farms, characterized in that: Includes the following steps: Step (1) Determine whether the current adjustment is a small load adjustment based on the size of the load adjustment command received by the AGC; Step (2) If the active small load adjustment strategy is implemented, determine whether the corresponding wind turbines participate in the small load distribution calculation based on the function activation / deactivation status and operating conditions of each wind turbine unit in the wind turbine group. Step (3) Based on the principle of approximating the adjustment margin of the wind turbine units participating in the allocation, the active power small load is allocated so that each wind turbine unit is not affected by the active power adjustment dead zone and correctly responds to the active power adjustment command to optimize the AGC adjustment quality. In step (3), the fans in the fan group adjustment margin for: Load command increment time: (2) Load command reduction time: (3) —fan Active power regulation margin; —fan The upper limit of effective output; —fan The lower limit of meritorious contribution; —fan The current active power generation value; Let n be the number of fans involved in the allocation calculation for a single small load adjustment command, and let the number of fans to be allocated be n. Its adjustment margin satisfies equation (4). If multiple wind turbines have the same adjustment margin, one of them can be chosen: （4） Based on the obtained proposed fan allocation, a judgment is made: if Then all small load command increments will be allocated to the wind turbines. ;like Then, after removing the currently assigned fan, continue to apply method (4) to sequentially increase the number of assigned fans until the requirement is met. At this point, the small load command increment will be distributed to each fan to be allocated. The allocation of active power regulation margin ratio.

5. The method according to claim 4, characterized in that: In step (1), when the load adjustment command received by AGC satisfies equation (1), the non-small load allocation strategy is executed; otherwise, the small load allocation strategy is executed. （1） —Incremental amount of active power adjustment commands for the entire station; —Active load allocation threshold value.

6. The method according to claim 4, characterized in that: In step (2), a logical judgment is made on whether all wind turbine units in the wind turbine group can participate in the distribution of active small loads: First, determine the corresponding status signal of the fan: ① Whether the communication between the wind turbine and wind turbine group monitoring system, and between the wind turbine group monitoring system and the AGC substation is normal; ②Is the active power measurement of the fan normal? ③ Whether the fan has malfunctioned; ④ Is the fan under maintenance? When all four conditions above are met, the output fan AGC activation enable signal is activated. If the AGC function is activated at this time, it is determined whether to participate in the allocation calculation based on the current operating condition of the fan. When the small load command increases, if the fan is not in the active power increase lockout state, it can participate in the small load allocation calculation. When a small load command is issued, if the fan is not in the active power reduction lockout state, it can participate in the small load allocation calculation.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, it implements the steps of the method described in any one of claims 4 to 6.

8. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 4 to 6.

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