Wind farm frequency control method and device

Abstract

Provided are a wind farm frequency control method and apparatus, which are executed by a field control device as a master station or a substation. The wind farm frequency control method executed by the field control device as a master station includes: calculating the backup power of a third-party substation; calculating the power allocation strategy of the third-party substation based on the backup power of the third-party substation and the primary frequency modulation instruction; sending the power allocation strategy of the third-party substation to the third-party substation, thereby realizing the primary frequency modulation function of controlling the wind turbine of the third-party manufacturer in the master station mode. The wind farm frequency control method executed by the field control device as a substation includes: obtaining the AGC instruction value of the wind farm from the third-party master station; calculating the backup power of the wind farm; and distributing the active power of the entire wind farm based on the power instruction sent by the third-party master station, the AGC instruction value of the wind farm, and the backup power, thereby realizing the primary frequency modulation function controlled by the field control device of the third-party manufacturer in the substation mode.

Description

Technical Field

[0001] The present disclosure relates to the field of wind power generation technology. More specifically, the present disclosure relates to a wind farm frequency control method and device. Background Art

[0002] The scale of grid-connected wind power capacity has grown rapidly, and this scale is expected to continue to increase in the future. In recent years, with the development of ultra-high voltage (UHV) power grids and the large-scale, continuous integration of renewable energy sources, a hybrid UHV AC / DC grid has gradually taken shape, significantly altering the grid structure and power supply mix, as well as the grid's characteristics. With the high penetration of renewable energy and the introduction of large-capacity DC transmission, the operating conditions of large-scale grid-connected wind power have become more complex. As the proportion of renewable energy increases, the frequency regulation capacity of existing thermal and hydropower plants is insufficient, necessitating the participation of renewable energy in frequency control. Summary of the Invention

[0003] According to an exemplary embodiment of the present disclosure, a wind farm frequency control method is provided, which is executed by a field control device as a master station, including: calculating the backup power of a third-party substation; calculating the power allocation strategy of the third-party substation based on the backup power of the third-party substation and a primary frequency regulation instruction; and sending the power allocation strategy of the third-party substation to the third-party substation.

[0004] Optionally, the step of calculating the backup power of the third-party substation includes: obtaining the measured power of the third-party substation and the AGC instruction of the third-party substation; and calculating the backup power of the third-party substation based on the measured power of the third-party substation and the AGC instruction of the third-party substation.

[0005] Optionally, the step of calculating the backup power of the third-party substation includes: obtaining the increaseable backup power and the decreaseable backup power sent by each third-party substation; accumulating the increaseable backup power and the decreaseable backup power of each third-party substation to obtain the increaseable backup power and the decreaseable backup power of the third-party substation.

[0006] Optionally, the step of obtaining the AGC instruction of the third-party substation includes: obtaining the AGC instruction of the third-party substation from the third-party substation by communicating with the third-party substation, or accumulating the AGC instruction of each wind turbine to obtain the AGC instruction of the third-party substation.

[0007] Optionally, the step of calculating the backup power of the third-party substation based on the measured power of the third-party substation and the AGC instruction of the third-party substation includes: determining the theoretical power of the third-party substation according to the AGC instruction of the third-party substation; obtaining the minimum controllable power of the third-party substation; and calculating the backup power of the third-party substation based on the measured power of the third-party substation, the theoretical power of the third-party substation and the minimum controllable power of the third-party substation.

[0008] Optionally, the step of calculating the backup power of the third-party substation based on the measured power of the third-party substation, the theoretical power of the third-party substation and the minimum controllable power of the third-party substation includes: calculating the increaseable backup power of the third-party substation based on the measured power of the third-party substation and the theoretical power of the third-party substation; calculating the decreaseable backup power of the third-party substation based on the measured power of the third-party substation and the minimum controllable power of the third-party substation.

[0009] Optionally, the step of calculating the power allocation strategy of the third-party substation based on the backup power of the third-party substation and the primary frequency modulation instruction includes: superimposing and locking the backup power of the third-party substation and the primary frequency modulation instruction; and calculating the power allocation strategy of the third-party substation based on the result of the superimposition and locking.

[0010] Optionally, the step of calculating the power allocation strategy of the third-party substation based on the result of the superposition lock includes: obtaining the power difference ratio coefficient of the third-party substation; calculating the power difference between the increase power and the decrease power of the third-party substation based on the power difference ratio coefficient of the third-party substation and the backup power of the third-party substation; and calculating the limit power of the third-party substation based on the power difference.

[0011] Optionally, the step of sending the power allocation strategy of the third-party substation to the third-party substation includes: sending the power allocation strategy of the third-party substation and a control flag to the third-party substation.

[0012] According to an exemplary embodiment of the present disclosure, a wind farm frequency control method is provided, which is executed by a field control device as a substation, including: obtaining an AGC instruction value of the wind farm from a third-party master station; calculating the backup power of the wind farm; and distributing active power to the entire wind farm based on the power instruction received from the third-party master station, the AGC instruction value of the wind farm, and the backup power.

[0013] Optionally, the step of distributing active power to the entire wind farm includes: superimposing and locking the power instruction and AGC instruction value received from the third-party master station; and distributing active power to the entire wind farm according to the superimposed and locked result and the backup power of the wind farm.

[0014] Optionally, the step of distributing active power to the entire wind farm based on the result of the superimposed blocking and the backup power of the wind farm includes: calculating the power distribution strategy of the wind farm based on the result of the superimposed blocking, and generating an active power distribution instruction of the wind farm based on the power distribution strategy; and sending the active power distribution instruction and the primary frequency modulation flag to each wind turbine in the wind farm.

[0015] Optionally, the mode of the field control device as a substation includes a power difference mode and a power limit mode. When the substation mode is the power difference mode, the received power instruction is a power difference instruction. When the substation mode is the power limit mode, the received power instruction is a power limit instruction.

[0016] According to an exemplary embodiment of the present disclosure, a master station field control device is provided, including: a power calculation unit, configured to calculate the backup power of a third-party substation; a strategy calculation unit, configured to calculate the power allocation strategy of the third-party substation based on the backup power of the third-party substation and a primary frequency modulation instruction; and a strategy sending unit, configured to send the power allocation strategy of the third-party substation to the third-party substation.

[0017] Optionally, the power calculation unit is configured to: obtain the measured power of the third-party substation and the AGC instruction of the third-party substation; and calculate the standby power of the third-party substation based on the measured power of the third-party substation and the AGC instruction of the third-party substation.

[0018] Optionally, the power calculation unit is configured to: obtain the increaseable standby power and the decreaseable standby power sent by each third-party substation; accumulate the increaseable standby power and the decreaseable standby power of each third-party substation to obtain the increaseable standby power and the decreaseable standby power of the third-party substation.

[0019] Optionally, the power calculation unit is configured to: obtain the AGC instruction of the third-party substation from the third-party substation by communicating with the third-party substation, or accumulate the AGC instruction of each wind turbine to obtain the AGC instruction of the third-party substation.

[0020] Optionally, the power calculation unit is configured to: determine the theoretical power of the third-party substation according to the AGC instruction of the third-party substation; obtain the minimum controllable power of the third-party substation; and calculate the backup power of the third-party substation based on the measured power of the third-party substation, the theoretical power of the third-party substation and the minimum controllable power of the third-party substation.

[0021] Optionally, the power calculation unit is configured to: calculate the increaseable standby power of the third-party substation based on the measured power of the third-party substation and the theoretical power of the third-party substation; calculate the decreaseable standby power of the third-party substation based on the measured power of the third-party substation and the minimum controllable power of the third-party substation.

[0022] Optionally, the strategy calculation unit is configured to: superimpose and lock the backup power of the third-party substation and the primary frequency modulation instruction; and calculate the power allocation strategy of the third-party substation according to the result of the superposition and locking.

[0023] Optionally, the policy calculation unit is configured to: obtain the power difference ratio coefficient of the third-party substation; calculate the power difference between the increase and decrease power of the third-party substation based on the power difference ratio coefficient of the third-party substation and the backup power of the third-party substation; and calculate the limit power of the third-party substation based on the power difference.

[0024] Optionally, the policy sending unit is configured to: send the power allocation policy and control flag of the third-party substation to the third-party substation.

[0025] According to an exemplary embodiment of the present disclosure, a substation field control device is provided, including: an instruction acquisition unit, configured to obtain an AGC instruction value of a wind farm from a third-party master station; a power calculation unit, configured to calculate the backup power of the wind farm; and a power distribution unit, configured to distribute active power to the entire wind farm based on the power instruction received from the third-party master station, the AGC instruction value of the wind farm and the backup power.

[0026] Optionally, the power distribution unit is configured to: superimpose and lock the power instruction and AGC instruction value received from the third-party master station; and distribute active power to the entire wind farm according to the superimposition and locking result and the backup power of the wind farm.

[0027] Optionally, the power distribution unit is configured to: calculate the power distribution strategy of the wind farm according to the result of the superposition lock, and generate the active power distribution instruction of the wind farm based on the power distribution strategy; and send the active power distribution instruction and the primary frequency modulation flag to each wind turbine in the wind farm.

[0028] Optionally, the substation mode includes a power difference mode and a power limit mode. When the substation mode is the power difference mode, the received power instruction is a power difference instruction. When the substation mode is the power limit mode, the received power instruction is a power limit instruction.

[0029] According to an exemplary embodiment of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the wind farm frequency control method according to the exemplary embodiment of the present disclosure is implemented.

[0030] According to an exemplary embodiment of the present disclosure, a computing device is provided, comprising: at least one processor; and at least one memory storing a computer program. When the computer program is executed by the at least one processor, a wind farm frequency control method according to an exemplary embodiment of the present disclosure is implemented.

[0031] According to an exemplary embodiment of the present disclosure, a computer program product is provided. Instructions in the computer program product can be executed by a processor of a computer device to implement a wind farm frequency control method according to an exemplary embodiment of the present disclosure.

[0032] The technical solutions provided by the embodiments of the present disclosure bring at least the following beneficial effects:

[0033] 1. The primary frequency modulation function of the fan of a third-party manufacturer is realized in the master station mode;

[0034] 2. The primary frequency modulation function of the substation mode controlled by the field control equipment of a third-party manufacturer is realized;

[0035] 3. From a technical perspective, the coordinated control of field control equipment and fans from different manufacturers has been achieved;

[0036] 4. Expand the market share from an economic perspective;

[0037] 5. From the grid level, meet the needs of different grids.

[0038] Additional aspects and / or advantages of the present general inventive concept will be set forth in part in the following description and in part will be apparent from the description, or may be learned through practice of the present general inventive concept. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above and other objects and features of exemplary embodiments of the present disclosure will become more apparent from the following description with reference to the accompanying drawings which exemplarily illustrate the embodiments.

[0040] Figure 1 The primary frequency modulation droop control curve is shown.

[0041] Figure 2 A flow chart illustrating a wind farm frequency control method executed by a farm control device as a master station according to an exemplary embodiment of the present disclosure is shown.

[0042] Figure 3 A flow chart illustrating a wind farm frequency control method executed by a farm control device serving as a substation according to an exemplary embodiment of the present disclosure is shown.

[0043] Figure 4 A block diagram of a master field control device according to an exemplary embodiment of the present disclosure is shown.

[0044] Figure 5 A block diagram of a substation field control device according to an exemplary embodiment of the present disclosure is shown.

[0045] Figure 6 A schematic diagram illustrating a computing device according to an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0046] Reference will now be made in detail to the exemplary embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like parts throughout. The embodiments will be described below with reference to the drawings to explain the present disclosure.

[0047] Currently, the control between wind turbines from different manufacturers has not been fully open. For field control equipment, each field control equipment basically controls its own wind turbine, and cross-control between field control and wind turbines from different manufacturers cannot be achieved.

[0048] In many wind farms, wind turbines from different manufacturers are installed on the same main transformer, or two main transformers under one grid connection point are equipped with wind turbines from two different manufacturers respectively, or for wind farms that are expanded later, the wind turbines in the later stage are not from the same manufacturer as those in the early stage.

[0049] When investing in a frequency modulation function, one often encounters fans that are not of one's own brand. The mutual modulation and control between different fan manufacturers becomes a constraint that affects the frequency modulation control effect.

[0050] Therefore, it is necessary to develop sub-station field control equipment that can be controlled by other manufacturers, and it is necessary to develop main station field control equipment that can control other manufacturers.

[0051] In new energy stations, in the case of high-frequency disturbances in the power grid, the primary frequency regulation action amount will no longer be adjusted downward after reaching 10% of the rated output. In the case of low-frequency disturbances in the power grid, the primary frequency regulation action amount will no longer be adjusted upward after reaching 5% of the rated output (10% and 5% are recommended setting values). The primary frequency regulation droop characteristic is achieved by setting the frequency and active power broken line function, that is:

[0052] f d ——primary frequency modulation dead zone, Hz;

[0053] f N ——system rated frequency, Hz;

[0054] P N ——rated power, MW;

[0055] δ%——new energy primary frequency regulation coefficient;

[0056] P0——initial value of active power, MW.

[0057] For example, the dead zone of primary frequency modulation is set to 0.05Hz, the adjustment coefficient is set to 5%, and the maximum power limit of primary frequency modulation power adjustment is set to 6%P N , the maximum power limit of the primary frequency modulation power is set to 10%P N The droop curve of the new energy station participating in the primary frequency regulation of the power grid is as follows: Figure 1 shown.

[0058] Figure 1 The primary frequency modulation step response indicators may include: starting time t0, starting time t d , response time t up , adjustment time t s , rated power P N , target power adjustment amount ΔP, etc.

[0059] Figure 2 A flow chart illustrating a wind farm frequency control method executed by a farm control device as a master station according to an exemplary embodiment of the present disclosure is shown. Figure 1 The wind farm frequency control method described in this paper is applicable when the wind turbines and the wind farm control equipment are manufactured by different manufacturers. Here, when the wind farm control equipment serves as the master station, it is also referred to as the master station control equipment. The master station control equipment primarily performs three functions: 1. Frequency measurement and primary frequency modulation frequency increment calculation; 2. Safety constraint protection functions; and 3. Communication and control with third-party substation control equipment.

[0060] Each wind farm needs to install a field control device to collect PT and CT data on the high-voltage side of the station's main transformer for frequency measurement. The field control device detects the frequency information of the grid connection point in real time and calculates the primary frequency modulation active power set value required by the wind farm through internal control logic.

[0061] To ensure the safe and stable operation of the wind farm, the following constraints are considered when allocating active power during primary frequency regulation operation:

[0062] (1) Voltage limit constraints at the control points of new energy stations;

[0063] (2) Voltage mutation constraints at the control points of new energy stations;

[0064] The guarantee of safety during the primary frequency regulation period includes the verification of the active power target value issued and the locking control when it exceeds the voltage and frequency limit range; after the primary frequency regulation of the new energy station is completed, the active power control is exited and the new energy station receives the original AGC command value control.

[0065] Reference Figure 2 , in step S201, the backup power of the third-party substation is calculated.

[0066] In an exemplary embodiment of the present disclosure, when calculating the standby power of a third-party substation, the measured power of the third-party substation and the AGC instruction of the third-party substation may be obtained first, and then the standby power of the third-party substation may be calculated based on the measured power of the third-party substation and the AGC instruction of the third-party substation. In an exemplary embodiment of the present disclosure, when calculating the standby power of a third-party substation, the increaseable standby power and the decreaseable standby power sent by each third-party substation may be obtained first, and then the increaseable standby power and the decreaseable standby power of each third-party substation may be accumulated to obtain the increaseable standby power and the decreaseable standby power of the third-party substation. In other words, there are two ways to calculate the standby power of a third-party substation: 1. By obtaining the theoretical power of the third-party substation minus the measured power of the third-party substation; 2. The third-party substation directly sends the standby power.

[0067] In an exemplary embodiment of the present disclosure, when obtaining the AGC command from a third-party substation, the AGC command can be obtained from the third-party substation by communicating with the third-party substation, or the AGC command of each wind turbine is accumulated to obtain the AGC command from the third-party substation. In other words, there are two ways to obtain the AGC command from the third-party substation: 1. Direct communication; 2. Accumulation of the commands from each wind turbine.

[0068] In an exemplary embodiment of the present disclosure, when calculating the backup power of the third-party substation based on the measured power of the third-party substation and the AGC instruction of the third-party substation, the theoretical power of the third-party substation can be first determined according to the AGC instruction of the third-party substation, and the minimum controllable power of the third-party substation can be obtained. Then, the backup power of the third-party substation is calculated based on the measured power of the third-party substation, the theoretical power of the third-party substation and the minimum controllable power of the third-party substation.

[0069] In an exemplary embodiment of the present disclosure, when calculating the backup power of the third-party substation based on the measured power of the third-party substation, the theoretical power of the third-party substation and the minimum controllable power of the third-party substation, the increaseable backup power of the third-party substation can be first calculated based on the measured power of the third-party substation and the theoretical power of the third-party substation, and then the decreaseable backup power of the third-party substation can be calculated based on the measured power of the third-party substation and the minimum controllable power of the third-party substation.

[0070] Specifically, the field control equipment is interconnected with the field control equipment of the third-party substation through communication, and the supported communication protocols are: Modbus and IEC104.

[0071] In step S202, a power allocation strategy of the third-party substation is calculated according to the backup power of the third-party substation and a primary frequency modulation instruction.

[0072] In an exemplary embodiment of the present disclosure, when calculating the power allocation strategy of the third-party substation based on the backup power of the third-party substation and the primary frequency modulation instruction, the backup power of the third-party substation and the primary frequency modulation instruction can be superimposed and locked first, and then the power allocation strategy of the third-party substation is calculated based on the result of the superposition and locking.

[0073] In an exemplary embodiment of the present disclosure, when calculating the power allocation strategy of the third-party substation based on the result of superimposed locking, the power difference ratio coefficient of the third-party substation can be obtained first, and the power difference between the increase power and the decrease power of the third-party substation can be calculated based on the power difference ratio coefficient of the third-party substation and the backup power of the third-party substation, and then the limit power of the third-party substation can be calculated based on the power difference.

[0074] Coordinated control between the master station's field control equipment and third-party substations includes two modes: 1. Difference mode; 2. Limit mode. Limit mode uses the difference plus the power before difference calculation (P0). P0 can be selected using either AGC instructions or measured power.

[0075] When the power difference ΔP of the third-party substation is less than the preset threshold or the backup power is insufficient, the allocation is exited.

[0076] In step S203, the power allocation strategy of the third-party substation is sent to the third-party substation.

[0077] In an exemplary embodiment of the present disclosure, when the power allocation strategy of the third-party substation is sent to the third-party substation, the power allocation strategy of the third-party substation and a control flag bit may be sent to the third-party substation.

[0078] The master station field control device can send the control flag bit to the data structure of the third-party substation. When the master station field control device directly controls the third-party wind turbine, the control flag bit is sent to the data structure of the third-party wind turbine.

[0079] The power transmission processing for the master station's field control equipment includes two modes: limit mode and difference mode. When set to limit mode, the processing is as follows: When the frequency modulation flag is not 0, the power limit assigned to the third-party substation is determined to be different from the power value of the third-party substation during the previous power control process. If a change is determined, at the scheduled power allocation strategy transmission time and when the frequency modulation master switch is in the on state, preparations are made to transmit the limit data structure. If the frequency modulation flag is 0, the transmission preparation is terminated. When set to difference mode, the processing is as follows: When the frequency modulation flag is not 0, the power difference assigned to the third-party substation is determined to be different from the power value of the third-party substation during the previous power control process. If a change is determined, at the scheduled power allocation strategy transmission time and when the frequency modulation master switch is in the on state, preparations are made to transmit the difference data structure. If the frequency modulation flag is 0, the transmission preparation is terminated.

[0080] At this point, the control data between the main station field control equipment and the third-party substation has been prepared and only needs to be sent down according to the communication protocol. The specific control and execution effects are at the third-party substation.

[0081] Figure 3 A flow chart illustrating a wind farm frequency control method executed by a farm control device serving as a substation according to an exemplary embodiment of the present disclosure is shown. Figure 3 The wind farm frequency control method in this paper is applicable to situations where the farm control equipment and wind turbines are from different manufacturers. Here, when the farm control equipment is a substation, it can also be called a substation farm control equipment.

[0082] Reference Figure 3 , in step S301, the AGC instruction value of the wind farm is obtained from the third-party master station.

[0083] In step S302 , the reserve power of the wind farm is calculated.

[0084] In step S303 , active power of the entire wind farm is distributed based on the received power instruction sent by the third-party master station, the AGC instruction value of the wind farm, and the backup power.

[0085] In an exemplary embodiment of the present disclosure, when distributing active power to the entire wind farm, the power instructions and AGC instruction values received from the third-party master station can first be superimposed and locked, and then the active power of the entire wind farm can be distributed based on the superimposed and locked results and the backup power of the wind farm.

[0086] In an exemplary embodiment of the present disclosure, when allocating active power to the entire wind farm based on the results of the superimposed locking and the backup power of the wind farm, the power allocation strategy of the wind farm can be first calculated based on the results of the superimposed locking, and the active power allocation instruction of the wind farm can be generated based on the power allocation strategy. Then, the active power allocation instruction and the primary frequency modulation flag are sent to each wind turbine in the wind farm.

[0087] In an exemplary embodiment of the present disclosure, the substation mode (also referred to as the mode of the substation field control device) includes a power difference mode and a power limit mode. When the substation mode is the power difference mode, the received power instruction is a power difference instruction. When the substation mode is the power limit mode, the received power instruction is a power limit instruction.

[0088] For example, the operating process within a single cycle of the substation function can be, but is not limited to: refresh control mode → refresh real-time data of the wind farm → update communication status → issue general variables → calculate relevant information of the wind farm → receive power limit instructions or difference instructions issued by the three-party master station → analyze the locking logic of primary frequency regulation and secondary frequency regulation → allocate the incremental value of active power of the wind farm → record and store historical data.

[0089] The following describes the sub-functions of the substation function of the field control equipment:

[0090] (1) Refresh control mode: refresh the fixed value and pressure plate information from time to time, and update the frequency modulation control mode once.

[0091] (2) Refresh input data within a single cycle: refresh fixed values, strategy values, lights and pressure plates, wind farm information, and wind turbine information.

[0092] (3) Refresh common variable values: read fixed value information, change and send common variable information, mainly including the common information of WFC and single machine.

[0093] (4) Calculate relevant information of the wind farm: calculate the real-time active power of the entire farm, the total AGC command value, the active power reserve value for increasing, and the active power reserve value for decreasing.

[0094] (5) Analysis of the blocking logic of primary and secondary frequency regulation: The rapid frequency response function of the renewable energy station should be coordinated with the AGC control. That is, the active power control target value of the renewable energy station should be the algebraic sum of the AGC command value and the rapid frequency response adjustment value. When the grid frequency exceeds 50±0.1Hz, the renewable energy rapid frequency response blocks the AGC reverse adjustment command.

[0095] (6) Allocating the incremental active power of the wind farm: Based on the power limit or difference command received from the three master stations, the control system distributes the active power of the entire wind farm according to the equal incremental rate rule based on the operating status of each wind farm. The equal incremental rate rule allocates the incremental active power of the entire wind farm according to the operating status of each wind turbine and sends it to each wind turbine.

[0096] There are two ways for the substation field control equipment to receive instructions from the master station: 1. Power difference instruction; 2. Power limit instruction.

[0097] When the mode of the substation field control device (i.e., substation mode) is set to power difference mode, the implementation method is:

[0098] This function receives the global active power increment command value and the primary frequency modulation flag. When the primary frequency modulation flag is non-zero, the global active power is added to the initial primary frequency modulation value. The primary frequency modulation flag is a 16-bit integer, and the global active power increment value is a floating-point value in kW.

[0099] When the mode of the substation field control device (i.e., substation mode) is set to power limit mode, the implementation method is:

[0100] This function receives the global active power command value and the primary frequency modulation flag. When the primary frequency modulation flag is non-zero, the global active power is adjusted to the active power command value issued by the master station based on the initial primary frequency modulation value. The primary frequency modulation flag is a 16-bit integer, and the global active power command value is a floating point value in kW.

[0101] (1) It is preferred to adopt the power limit mode. The substation field control equipment receives the active power command value. In the power difference mode, if the flag bit and the active power increment command value are not synchronized, it will affect the superposition effect of the primary frequency modulation and the secondary frequency modulation.

[0102] (2) During the period when the third-party master station issues the exit frequency modulation command, the active power increment command value is 0. The wind turbine needs a relatively small power difference command to exit the frequency modulation mode normally. This will affect the exit and the long-term operation status of the wind turbine.

[0103] In addition, according to an exemplary embodiment of the present disclosure, a computer-readable storage medium is further provided, on which a computer program is stored. When the computer program is executed, the wind farm frequency control method according to the exemplary embodiment of the present disclosure is implemented.

[0104] In an exemplary embodiment of the present disclosure, the computer-readable storage medium may carry one or more programs, and when the computer program is executed, the following steps may be implemented: calculating the backup power of the third-party substation; calculating the power allocation strategy of the third-party substation based on the backup power of the third-party substation and a primary frequency modulation instruction; and sending the power allocation strategy of the third-party substation to the third-party substation.

[0105] Computer-readable storage media can be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or components, or any combination thereof. More specific examples of computer-readable storage media can include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In embodiments of the present disclosure, a computer-readable storage medium can be any tangible medium that contains or stores a computer program that can be used by or in conjunction with an instruction execution system, device or component. The computer program contained on the computer-readable storage medium can be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination thereof. The computer-readable storage medium can be contained in any device; it can also exist independently without being assembled into the device.

[0106] In addition, according to an exemplary embodiment of the present disclosure, a computer program product is further provided. Instructions in the computer program product can be executed by a processor of a computer device to implement the method for controlling the frequency of a wind farm according to an exemplary embodiment of the present disclosure.

[0107] The above has been combined Figures 1 to 3 A wind farm frequency control method according to an exemplary embodiment of the present disclosure is described. Figure 4 and Figure 5 A master station field control device and a slave station field control device and units thereof according to exemplary embodiments of the present disclosure are described.

[0108] Figure 4 A block diagram of a master field control device according to an exemplary embodiment of the present disclosure is shown.

[0109] Reference Figure 4 The master station field control device includes a power calculation unit 41, a strategy calculation unit 42 and a strategy sending unit 43.

[0110] The power calculation unit 41 is configured to calculate the backup power of the third-party substation.

[0111] In an exemplary embodiment of the present disclosure, the power calculation unit 41 may be configured to: obtain the measured power of the third-party substation and the AGC instruction of the third-party substation; and calculate the backup power of the third-party substation based on the measured power of the third-party substation and the AGC instruction of the third-party substation.

[0112] In an exemplary embodiment of the present disclosure, the power calculation unit 41 can be configured to: obtain the increaseable standby power and the decreaseable standby power sent by each third-party substation; accumulate the increaseable standby power and the decreaseable standby power of each third-party substation to obtain the increaseable standby power and the decreaseable standby power of the third-party substation.

[0113] In an exemplary embodiment of the present disclosure, the power calculation unit 41 can be configured to: obtain the AGC instruction of the third-party substation from the third-party substation by communicating with the third-party substation, or accumulate the AGC instruction of each wind turbine to obtain the AGC instruction of the third-party substation.

[0114] In an exemplary embodiment of the present disclosure, the power calculation unit 41 can be configured to: determine the theoretical power of the third-party substation according to the AGC instruction of the third-party substation; obtain the minimum controllable power of the third-party substation; and calculate the backup power of the third-party substation based on the measured power of the third-party substation, the theoretical power of the third-party substation and the minimum controllable power of the third-party substation.

[0115] In an exemplary embodiment of the present disclosure, the power calculation unit 41 can be configured to: calculate the increaseable standby power of the third-party substation based on the measured power of the third-party substation and the theoretical power of the third-party substation; calculate the decreaseable standby power of the third-party substation based on the measured power of the third-party substation and the minimum controllable power of the third-party substation.

[0116] The strategy calculation unit 42 is configured to calculate the power allocation strategy of the third-party substation according to the backup power of the third-party substation and the primary frequency modulation instruction.

[0117] In an exemplary embodiment of the present disclosure, the strategy calculation unit 42 may be configured to: superimpose and lock the backup power of the third-party substation with the primary frequency modulation instruction; and calculate the power allocation strategy of the third-party substation according to the result of the superposition and locking.

[0118] In an exemplary embodiment of the present disclosure, the strategy calculation unit 42 can be configured to: obtain the power difference ratio coefficient of the third-party substation; calculate the power difference between the increase power and the decrease power of the third-party substation based on the power difference ratio coefficient of the third-party substation and the backup power of the third-party substation; and calculate the limit power of the third-party substation based on the power difference.

[0119] The policy sending unit 43 is configured to send the power allocation policy of the third-party substation to the third-party substation.

[0120] In an exemplary embodiment of the present disclosure, the policy sending unit 43 may be configured to send the power allocation policy and control flag of the third-party substation to the third-party substation.

[0121] Figure 5 A block diagram of a substation field control device according to an exemplary embodiment of the present disclosure is shown.

[0122] Reference Figure 5 The substation field control device includes an instruction acquisition unit 51, a power calculation unit 52 and a power distribution unit 53.

[0123] The instruction acquisition unit 51 is configured to acquire the AGC instruction value of the wind farm from a third-party master station.

[0124] The power calculation unit 52 is configured to calculate the reserve power of the wind farm.

[0125] The power distribution unit 53 is configured to distribute the active power of the entire wind farm based on the power instruction received from the third-party master station, the AGC instruction value of the wind farm and the backup power.

[0126] In an exemplary embodiment of the present disclosure, the power distribution unit 53 can be configured to: superimpose and lock the power instructions and AGC instruction values received from the third-party master station; and distribute active power to the entire wind farm based on the superimposed locking results and the backup power of the wind farm.

[0127] In an exemplary embodiment of the present disclosure, the power distribution unit 53 can be configured to: calculate the power distribution strategy of the wind farm based on the result of the superposition lock, and generate the active power distribution instruction of the wind farm based on the power distribution strategy; and send the active power distribution instruction and the primary frequency modulation flag to each wind turbine in the wind farm.

[0128] In an exemplary embodiment of the present disclosure, the substation mode includes a power difference mode and a power limit mode. When the substation mode is the power difference mode, the received power instruction is a power difference instruction. When the substation mode is the power limit mode, the received power instruction is a power limit instruction.

[0129] The above has been combined Figure 4 and Figure 5 The wind farm frequency control device according to the exemplary embodiment of the present disclosure is described. Figure 6 A computing device according to an exemplary embodiment of the present disclosure is described.

[0130] Figure 6 A schematic diagram illustrating a computing device according to an exemplary embodiment of the present disclosure.

[0131] Reference Figure 6According to the exemplary embodiment of the present disclosure, the computing device 6 includes a memory 61 and a processor 62. The memory 51 stores a computer program. When the computer program is executed by the processor 62, the wind farm frequency control method according to the exemplary embodiment of the present disclosure is implemented.

[0132] In an exemplary embodiment of the present disclosure, when the computer program is executed by the processor 62, the following steps can be implemented: calculating the backup power of the third-party substation; calculating the power allocation strategy of the third-party substation based on the backup power of the third-party substation and a primary frequency modulation instruction; and sending the power allocation strategy of the third-party substation to the third-party substation.

[0133] Figure 6 The computing device shown is only an example and should not bring any limitation to the functions and usage scope of the embodiments of the present disclosure.

[0134] The above has been referred to Figures 1 to 6 The wind farm frequency control method and apparatus according to the exemplary embodiments of the present disclosure are described. However, it should be understood that: Figure 4 and Figure 5 The wind farm frequency control device and its units shown in the figure may be configured as software, hardware, firmware or any combination of the above items to perform specific functions. Figure 6 The computing device shown in is not limited to including the components shown above, but some components may be added or deleted as needed, and the above components may also be combined.

[0135] According to the exemplary embodiment of the present disclosure, the wind farm frequency control method and device executed by the field control equipment as the master station calculates the backup power of the third-party substation, calculates the power allocation strategy of the third-party substation according to the backup power of the third-party substation and the primary frequency regulation instruction, and sends the power allocation strategy of the third-party substation to the third-party substation, thereby realizing the primary frequency regulation function of controlling the wind turbine of the third-party manufacturer in the master station mode.

[0136] According to the exemplary embodiment of the present disclosure, the wind farm frequency control method and device executed by the field control equipment as a substation obtains the AGC instruction value of the wind farm from the third-party master station, calculates the backup power of the wind farm, and distributes the active power of the entire wind farm based on the power instruction sent by the third-party master station, the AGC instruction value of the wind farm and the backup power, thereby realizing the primary frequency regulation function controlled by the field control equipment of the third-party manufacturer in the substation mode.

[0137] According to the wind farm frequency control method and device of the exemplary embodiment of the present disclosure, by providing a master station mode and a substation mode, coordinated control of field control equipment and wind turbines from different manufacturers is achieved from a technical perspective; the market share is expanded from an economic perspective; and the needs of different power grids are met from a power grid level.

[0138] While the present disclosure has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the following claims.

Claims

1. A wind farm frequency control method executed by a field control device as a master station, comprising: Calculate the backup power of third-party substations; Calculate the power allocation strategy of the third-party substation based on the backup power of the third-party substation and the primary frequency modulation instruction; Sending the power allocation strategy of the third-party substation to the third-party substation; The steps of calculating the backup power of the third-party substation include: Obtaining the measured power of the third-party substation and the AGC instruction of the third-party substation; and calculating the standby power of the third-party substation based on the measured power of the third-party substation and the AGC instruction of the third-party substation, or, Obtaining the increaseable standby power and the decreaseable standby power sent by each third-party substation; and accumulating the increaseable standby power and the decreaseable standby power of each third-party substation to obtain the increaseable standby power and the decreaseable standby power of the third-party substation; The step of calculating the power allocation strategy of the third-party substation based on the backup power of the third-party substation and the primary frequency modulation instruction includes: superimposing and locking the backup power of the third-party substation and the primary frequency modulation instruction; and calculating the power allocation strategy of the third-party substation based on the result of the superimposition and locking. Among them, the steps of calculating the power allocation strategy of the third-party substation based on the result of the superposition lock include: obtaining the power difference ratio coefficient of the third-party substation; calculating the power difference between the increase power and the decrease power of the third-party substation based on the power difference ratio coefficient of the third-party substation and the backup power of the third-party substation; and calculating the limit power of the third-party substation based on the power difference.

2. The method according to claim 1, wherein The steps of calculating the standby power of the third-party substation based on the measured power of the third-party substation and the AGC instruction of the third-party substation include: Determine the theoretical power of the third-party substation according to the AGC instruction of the third-party substation; Obtain the minimum controllable power of the third-party substation; The backup power of the third-party substation is calculated based on the measured power of the third-party substation, the theoretical power of the third-party substation, and the minimum controllable power of the third-party substation.

3. The method according to claim 2, wherein: The steps of calculating the backup power of the third-party substation according to the measured power of the third-party substation, the theoretical power of the third-party substation, and the minimum controllable power of the third-party substation include: Calculate the increaseable standby power of the third-party substation based on the measured power and theoretical power of the third-party substation; The reducible standby power of the third-party substation is calculated based on the measured power of the third-party substation and the minimum controllable power of the third-party substation.

4. A wind farm frequency control method executed by a field control device as a substation, comprising: Obtain the AGC command value of the wind farm from the third-party master station; Calculate the reserve power of wind farms; Based on the power command received from the third-party master station, the AGC command value of the wind farm and the backup power, the active power of the wind farm is distributed throughout the wind farm. The steps of distributing active power to the entire wind farm include: Superimpose and lock the power command and AGC command value received from the third-party master station; Calculating the power allocation strategy of the wind farm according to the result of the superposition blocking, and generating the active power allocation instruction of the wind farm based on the power allocation strategy; Sending active power distribution instructions and primary frequency regulation flags to each wind turbine in the wind farm; The power allocation strategy of the wind farm is calculated based on the result of the superposition blocking: the power difference ratio coefficient of the wind farm is obtained; the power difference between the power increase and power reduction of the wind farm is calculated based on the power difference ratio coefficient of the wind farm and the reserve power of the wind farm; and the limit power of the wind farm is calculated based on the power difference.

5. The method according to claim 4, wherein The modes of the field control device as a substation include power difference mode and power limit mode. When the substation mode is power difference mode, the received power instruction is a power difference instruction. When the substation mode is power limit mode, the received power instruction is a power limit instruction.

6. A master station field control device, comprising: a power calculation unit configured to calculate the backup power of the third-party substation; a strategy calculation unit configured to calculate a power allocation strategy of the third-party substation according to the backup power of the third-party substation and a primary frequency modulation instruction; and a policy sending unit, configured to send a power allocation policy of a third-party substation to the third-party substation; The power calculation unit is configured as follows: Obtaining the measured power of the third-party substation and the AGC instruction of the third-party substation; and calculating the standby power of the third-party substation based on the measured power of the third-party substation and the AGC instruction of the third-party substation, or, Obtaining the increaseable standby power and the decreaseable standby power sent by each third-party substation; and accumulating the increaseable standby power and the decreaseable standby power of each third-party substation to obtain the increaseable standby power and the decreaseable standby power of the third-party substation; The strategy calculation unit is further configured to: superimpose and block the backup power of the third-party substation and the primary frequency modulation instruction; and calculate the power allocation strategy of the third-party substation according to the result of the superimposition and blocking; Among them, the strategy calculation unit is further configured to: obtain the power difference ratio coefficient of the third-party substation; calculate the power difference between the increase and decrease power of the third-party substation based on the power difference ratio coefficient of the third-party substation and the backup power of the third-party substation; calculate the limit power of the third-party substation based on the power difference.

7. A substation field control device, comprising: An instruction acquisition unit is configured to acquire an AGC instruction value of the wind farm from a third-party master station; a power calculation unit configured to calculate the reserve power of the wind farm; and The power distribution unit is configured to distribute active power of the entire wind farm based on the power command received from the third-party master station, the AGC command value of the wind farm, and the backup power; The power distribution unit is configured as follows: Superimpose and lock the power command and AGC command value received from the third-party master station; Allocate active power to the entire wind farm based on the result of superposition blocking and the reserve power of the wind farm; The power allocation unit is further configured to calculate the power allocation strategy of the wind farm based on the result of the superimposed locking: obtain the power difference ratio coefficient of the wind farm; calculate the power difference between the increased power and the decreased power of the wind farm based on the power difference ratio coefficient of the wind farm and the reserve power of the wind farm; and calculate the limit power of the wind farm based on the power difference.

8. A computer-readable storage medium storing a computer program, wherein: When the computer program is executed by a processor, the method according to any one of claims 1 to 3 or the method according to any one of claims 4 to 5 is implemented.

9. A computing device comprising: at least one processor; At least one memory stores a computer program, and when the computer program is executed by the at least one processor, the method according to any one of claims 1 to 3 is implemented, or the method according to any one of claims 4 to 5 is implemented.

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