Wind power plant frequency active support control method, system and device and storage medium

Abstract

The invention discloses a wind power plant frequency active support control method, system and device and a storage medium, and the method comprises the steps: detecting a wind power plant grid-connected point frequency in real time, and comparing the wind power plant grid-connected point frequency with a system rated frequency to obtain a grid-connected point primary frequency modulation control state; determining active power distribution reference values of a grid-connected point and the wind turbine generator according to the AGC adjusting signal, the primary frequency modulation adjusting signal and the time required for single adjustment of the wind turbine generator; based on the grid-connected point active power distribution reference value, obtaining a primary frequency modulation active power regulation quantity, calculating loss corresponding to the grid-connected point primary frequency modulation active power regulation quantity, and correcting the grid-connected point primary frequency modulation active power regulation quantity; distributing and issuing the corrected primary frequency modulation active power regulation quantity of the grid-connected point; according to the method, the active loss is predicted according to the wind power plant grid-connected point active power, the grid-connected point reactive power, the environment temperature and other data, the problem of inaccuracy caused by only using the active power is avoided, and the accuracy of active loss calculation is improved.

Description

Technical Field

[0001] The present invention relates to a method, system, device and storage medium for active frequency support control, and in particular to a method, system, device and storage medium for active frequency support control of a wind farm, belonging to the technical field of power system control. Background Art

[0002] With the increasing attention paid to renewable energy generation and the continuous development of wind power generation technology, the penetration rate of wind power in the power system continues to increase. There is an urgent need for wind power to participate in the primary frequency response of the power grid and improve the frequency safety and stability level of the power grid.

[0003] At present, the primary frequency regulation control system of wind farms has been put into operation on site, and many provinces and regions have carried out wind farms participating in primary frequency regulation experiments. However, in the existing primary frequency regulation control algorithm, the calculation of active power loss at the grid connection point only considers the change in active power, and does not take into account the influence of factors such as reactive power and ambient temperature, resulting in a large error in active power loss. The influence of the previous AGC adjustment process was not considered when allocating the primary frequency regulation active power command, resulting in inaccurate active power allocation, causing the primary frequency regulation accuracy to fail to meet the limit requirements. In addition, due to communication and other reasons, the wind turbine did not receive the frequency regulation enable or stop enable flag control word issued by the primary frequency regulation system. On the one hand, it caused the wind turbine to fail to correctly execute the primary frequency regulation command, which affected the assessment indicators such as the primary frequency regulation integral power. On the other hand, it caused the wind turbine to be out of AGC control for a long time, resulting in over-generation of active power in the wind farm, and there was a risk of suspension penalty. Summary of the invention

[0004] Purpose of the invention: The purpose of the present invention is to provide a method, system, device and storage medium for active frequency support control of a wind farm that can improve the accuracy of active power loss calculation.

[0005] Technical solution: A wind farm frequency active support control method according to the present invention comprises:

[0006] Real-time detection of the wind farm grid connection point frequency, comparison with the system rated frequency, and obtaining the primary frequency regulation control status of the grid connection point;

[0007] Determine the grid connection point and the reference value of active power distribution of wind turbines according to the AGC regulation signal, the primary frequency regulation signal and the time required for a single regulation of the wind turbines;

[0008] The active power target value of the primary frequency modulation at the grid connection point is calculated according to the active frequency droop characteristic, the active power adjustment amount of the primary frequency modulation is obtained based on the active power distribution reference value of the grid connection point, the loss corresponding to the active power adjustment amount of the primary frequency modulation at the grid connection point is calculated through the neural network model, and the active power adjustment amount of the primary frequency modulation at the grid connection point is corrected;

[0009] According to the primary frequency regulation control state of the wind turbine generator set, the corrected primary frequency regulation active power regulation amount of the grid connection point is distributed, and the distribution result is sent to each wind turbine generator set.

[0010] Furthermore, the real-time detection of the wind farm grid connection point frequency is compared with the system rated frequency to obtain the primary frequency regulation control state of the grid connection point, including:

[0011] Take the frequency value f of the last moment of the network point mea_last is the real-time value of the frequency of the grid connection point; suppose the frequency comparison judgment period is T, when the judgment interval time arrives, take the current frequency value of the grid connection point f mea_current It is the real-time value of the frequency of the grid connection point;

[0012] If |f mea_last -f n | <f d ,|f mea_current -f n |≥f d , then the frequency modulation control state is recorded as: from no action to action rising edge;

[0013] If |f mea_last -f n |≥f d ,|f mea_current -f n |≥f d , then the primary frequency modulation control state is recorded as: acted;

[0014] If |f mea_last -f n |≥f d ,|f mea_current -f n | <f d , then the frequency modulation control state is recorded as: from action to reset falling edge;

[0015] If |f mea_last -f n | <f d ,|f mea_current -f n | <f d , then the primary frequency modulation control state is recorded as: restored;

[0016] Among them, f n is the rated frequency of the system, f d It is the primary frequency regulation dead zone of the wind farm;

[0017] After completing the comparison, let f mea_last =f mea_current .

[0018] Furthermore, the determination of the grid connection point and the reference value of active power distribution of the wind turbine generator set according to the AGC adjustment signal, the primary frequency adjustment signal, and the time required for a single adjustment of the wind turbine generator set includes:

[0019] If the AGC regulation start signal is not received before a frequency regulation action, compare the current frequency regulation action time with the previous frequency regulation end time. If the time interval between the two is less than the time required for a single regulation of the wind turbine, the active power at the time of the previous frequency regulation action is taken as the allocation reference value; if the time interval between the two is greater than or equal to the time required for a single regulation of the wind turbine, the active power at the current time is taken as the allocation reference value;

[0020] If an AGC regulation start signal is received before a frequency regulation action, compare the frequency regulation action time with the AGC regulation start time. If the time interval between the two is less than the time required for a single regulation of the wind turbine, the active power at the start time of the AGC regulation is taken as the allocation reference value; if the time interval between the two is greater than or equal to the time required for a single regulation of the wind turbine, the active power at the current time is taken as the allocation reference value.

[0021] Further, the method of calculating the primary frequency modulation active power target value of the grid connection point according to the active frequency droop characteristic, obtaining the primary frequency modulation active power adjustment amount based on the grid connection point active power distribution reference value, calculating the loss corresponding to the primary frequency modulation active power adjustment amount of the grid connection point through a neural network model, and correcting the primary frequency modulation active power adjustment amount of the grid connection point includes:

[0022] Calculate the active power target value P of the primary frequency modulation at the grid connection point according to the active frequency droop characteristics target , then the primary frequency modulation active power regulation ΔP pcc =P target -P pcc_ref , P pcc_ref Allocate reference value for active power at the grid connection point;

[0023] Obtain the historical data of active power, reactive power, ambient temperature and active power loss of the grid connection point as training samples, train the neural network model and obtain the corresponding relationship between the grid connection point operation data and active power loss; the active power loss of the grid connection point is obtained by the difference between the active power of the grid connection point and the active power of the wind turbine;

[0024] The active power target value of primary frequency modulation, the reactive power of the grid connection point at the time of primary frequency modulation action and the ambient temperature are input into the model, and the loss P corresponding to the active power target value of primary frequency modulation at the grid connection point is obtained through the model output. target_loss ;

[0025] Take the loss P corresponding to the reference value of active power distribution of primary frequency modulation at the grid point pcc_ref_loss It is equal to the difference between the active power distribution reference value of the grid connection point and the active power distribution reference value of the wind turbine generator set;

[0026] Calculate the loss P corresponding to the active power regulation of the primary frequency modulation at the grid connection point change_loss =P target_loss -P pcc_ref_loss ;

[0027] Calculate the corrected active power regulation of primary frequency modulation at the grid connection point ΔP′ pcc =ΔP pcc +P change_loss .

[0028] Furthermore, the method of allocating the corrected primary frequency regulation active power adjustment amount of the grid connection point according to the primary frequency regulation control state of the wind turbine generator set and sending the allocation result to each wind turbine generator set includes:

[0029] If the primary frequency modulation control state is: from no action to action rising edge, first send a primary frequency modulation active power instruction to the wind turbine through remote adjustment, and after a preset delay time, send a primary frequency modulation enable flag control word through remote adjustment or remote control to start the primary frequency modulation instruction;

[0030] If the primary frequency regulation control state is: from action to reset falling edge, the primary frequency regulation stop enable flag control word is sent to the wind turbine through remote adjustment or remote control, the primary frequency regulation instruction is stopped, and the control right of the wind turbine is returned to the AGC;

[0031] If the primary frequency modulation control state is: acted, then the primary frequency modulation enabling control cycle timer is started. When the primary frequency modulation enabling control cycle timer completes the timing, the primary frequency modulation enabling flag control word is sent to the wind turbine to ensure that the wind turbine can normally execute the primary frequency modulation instruction.

[0032] If the primary frequency modulation control state is: restored, start the primary frequency modulation stop enable control cycle timer. When the primary frequency modulation stop enable control cycle timer completes the timing, send the primary frequency modulation stop enable flag control word to the wind turbine to ensure that the wind turbine no longer executes the primary frequency modulation instruction.

[0033] Based on the same inventive concept, the present invention also provides a wind farm frequency active support control system, comprising:

[0034] The primary frequency regulation control state judgment module is used to detect the frequency of the wind farm grid connection point in real time, compare it with the rated frequency of the system, and obtain the primary frequency regulation control state of the grid connection point;

[0035] An active power distribution reference value determination module is used to determine the grid connection point and the active power distribution reference value of the wind turbine generator set according to the AGC adjustment signal, the primary frequency regulation signal and the time required for a single adjustment of the wind turbine generator set;

[0036] The grid connection point active power regulation amount determination module is used to calculate the grid connection point primary frequency modulation active power target value according to the active frequency droop characteristics, obtain the primary frequency modulation active power regulation amount based on the grid connection point active power distribution reference value, calculate the loss corresponding to the grid connection point primary frequency modulation active power regulation amount through the neural network model, and correct the grid connection point primary frequency modulation active power regulation amount;

[0037] The wind turbine active power control module is used to distribute the corrected grid-connected point primary frequency regulation active power adjustment amount according to the primary frequency regulation control state of the wind turbine, and send the distribution result to each wind turbine.

[0038] Furthermore, the primary frequency regulation control state judgment module is used to detect the frequency of the wind farm grid connection point in real time, compare it with the system rated frequency, and obtain the primary frequency regulation control state of the grid connection point, including:

[0039] Take the frequency value f of the last moment of the network point mea_last is the real-time value of the frequency of the grid connection point; suppose the frequency comparison judgment period is T, when the judgment interval time arrives, take the current frequency value of the grid connection point f mea_current It is the real-time value of the frequency of the grid connection point;

[0040] If |f mea_last -f n | <f d ,|f mea_current -f n |≥f d , then the frequency modulation control state is recorded as: from no action to action rising edge;

[0041] If |f mea_last -f n |≥f d ,|f mea_current -f n |≥f d , then the primary frequency modulation control state is recorded as: acted;

[0042] If |f mea_last -f n |≥f d ,|f mea_current -f n | <f d , then the frequency modulation control state is recorded as: from action to reset falling edge;

[0043] If |f mea_last -f n | <f d ,|f mea_current -f n | <f d , then the primary frequency modulation control state is recorded as: restored;

[0044] Among them, f n is the rated frequency of the system, f d It is the primary frequency regulation dead zone of the wind farm;

[0045] After completing the comparison, let f mea_last =f mea_current .

[0046] Furthermore, the active power distribution reference value determination module is used to determine the grid connection point and the active power distribution reference value of the wind turbine generator set according to the AGC adjustment signal, the primary frequency regulation signal, and the time required for a single adjustment of the wind turbine generator set, including:

[0047] If the AGC regulation start signal is not received before a frequency regulation action, compare the current frequency regulation action time with the previous frequency regulation end time. If the time interval between the two is less than the time required for a single regulation of the wind turbine, the active power at the time of the previous frequency regulation action is taken as the allocation reference value; if the time interval between the two is greater than or equal to the time required for a single regulation of the wind turbine, the active power at the current time is taken as the allocation reference value;

[0048] If an AGC regulation start signal is received before a frequency regulation action, compare the frequency regulation action time with the AGC regulation start time. If the time interval between the two is less than the time required for a single regulation of the wind turbine, the active power at the start time of the AGC regulation is taken as the allocation reference value; if the time interval between the two is greater than or equal to the time required for a single regulation of the wind turbine, the active power at the current time is taken as the allocation reference value.

[0049] Furthermore, the grid connection point active power regulation amount determination module is used to calculate the grid connection point primary frequency modulation active power target value according to the active frequency droop characteristic, obtain the primary frequency modulation active power regulation amount based on the grid connection point active power distribution reference value, calculate the loss corresponding to the grid connection point primary frequency modulation active power regulation amount through the neural network model, and correct the grid connection point primary frequency modulation active power regulation amount, including:

[0050] Calculate the active power target value P of the primary frequency modulation at the grid connection point according to the active frequency droop characteristics target , then the primary frequency modulation active power regulation ΔP pcc =P target -P pcc_ref , P pcc_ref Allocate reference value for active power at the grid connection point;

[0051] Obtain the historical data of active power, reactive power, ambient temperature and active power loss of the grid connection point as training samples, train the neural network model and obtain the corresponding relationship between the grid connection point operation data and active power loss; the active power loss of the grid connection point is obtained by the difference between the active power of the grid connection point and the active power of the wind turbine;

[0052] The active power target value of primary frequency modulation, the reactive power of the grid connection point at the time of primary frequency modulation action and the ambient temperature are input into the model, and the loss P corresponding to the active power target value of primary frequency modulation at the grid connection point is obtained through the model output. target_loss ;

[0053] Take the loss P corresponding to the reference value of active power distribution of primary frequency modulation at the grid point pcc_ref_loss It is equal to the difference between the active power distribution reference value of the grid connection point and the active power distribution reference value of the wind turbine generator set;

[0054] Calculate the loss P corresponding to the active power regulation of the primary frequency modulation at the grid connection point change_loss =P target_loss -P pcc_ref_loss ;

[0055] Calculate the corrected active power regulation of primary frequency modulation at the grid connection point ΔP′ pcc =ΔP pcc +P change_loss .

[0056] Furthermore, the method of allocating the corrected primary frequency regulation active power adjustment amount of the grid connection point according to the primary frequency regulation control state of the wind turbine generator set and sending the allocation result to each wind turbine generator set includes:

[0057] If the primary frequency modulation control state is: from no action to action rising edge, first send a primary frequency modulation active power instruction to the wind turbine through remote adjustment, and after a preset delay time, send a primary frequency modulation enable flag control word through remote adjustment or remote control to start the primary frequency modulation instruction;

[0058] If the primary frequency regulation control state is: from action to reset falling edge, the primary frequency regulation stop enable flag control word is sent to the wind turbine through remote adjustment or remote control, the primary frequency regulation instruction is stopped, and the control right of the wind turbine is returned to the AGC;

[0059] If the primary frequency modulation control state is: acted, then the primary frequency modulation enabling control cycle timer is started. When the primary frequency modulation enabling control cycle timer completes the timing, the primary frequency modulation enabling flag control word is sent to the wind turbine to ensure that the wind turbine can normally execute the primary frequency modulation instruction.

[0060] If the primary frequency modulation control state is: restored, start the primary frequency modulation stop enable control cycle timer. When the primary frequency modulation stop enable control cycle timer completes the timing, send the primary frequency modulation stop enable flag control word to the wind turbine to ensure that the wind turbine no longer executes the primary frequency modulation instruction.

[0061] Based on the same inventive concept, the present invention also provides a computing device, comprising: one or more processors, one or more memories and one or more programs, wherein the programs are stored in the memories and configured to be executed by the processors, and when the programs are loaded into the processors, the steps of the wind farm frequency active support control method according to any one of the above items are implemented.

[0062] Based on the same inventive concept, the present invention also provides a storage medium, which stores a computer program, and the computer program includes program instructions. When the program instructions are executed by a processor, the processor executes the steps of the wind farm frequency active support control method described in any one of the above items.

[0063] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: 1. The present invention predicts the active power loss based on the active power of the wind farm grid connection point, the reactive power of the grid connection point, the ambient temperature and other data, avoiding the inaccuracy caused by using only the active power, and improving the accuracy of the active power loss calculation; 2. The present invention selects the active power at different times as the allocation reference value according to the time interval with the AGC adjustment when the frequency modulation instruction is allocated, and the time interval with the last frequency modulation adjustment, so as to solve the problem of asynchronous refresh of the active power of the grid connection point and the active power of the wind turbine. , making the active power distribution result more accurate and improving the primary frequency regulation accuracy; 3. The present invention periodically sends a primary frequency regulation enable flag control word to the wind turbine during the primary frequency regulation action, so that the wind turbine can correctly execute the primary frequency regulation instruction and meet the grid dispatching requirements for the primary frequency regulation integral power and other assessment indicators; after the primary frequency regulation is restored, the primary frequency regulation stop enable flag control word is periodically sent to the wind turbine to ensure that the wind turbine can reliably switch from the primary frequency regulation control to the AGC control, avoiding the over-generation of the AGC due to the uncontrolled wind turbine, resulting in the shutdown of the entire field. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 is a flow chart of a method according to an embodiment of the present invention;

[0065] Figure 2 4 is a system framework diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0066] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0067] As attached Figure 1 As shown, the wind farm frequency active support control method of this embodiment includes:

[0068] Step 1: Real-time detection of the wind farm grid connection point frequency, comparison with the system rated frequency, and obtaining the primary frequency regulation control state of the grid connection point;

[0069] Step 2: Determine the grid connection point and the reference value of active power distribution of the wind turbine according to the AGC regulation signal, the primary frequency regulation signal and the time required for a single regulation of the wind turbine;

[0070] Step 3: Calculate the primary frequency modulation active power target value of the grid connection point according to the active frequency droop characteristics, obtain the primary frequency modulation active power adjustment amount based on the grid connection point active power distribution reference value, calculate the loss corresponding to the primary frequency modulation active power adjustment amount of the grid connection point through the neural network model, and correct the primary frequency modulation active power adjustment amount of the grid connection point;

[0071] Step 4: According to the primary frequency regulation control state of the wind turbine generator set, the corrected primary frequency regulation active power regulation amount of the grid connection point is allocated, and the allocation result is sent to each wind turbine generator set.

[0072] Specifically, in step 1, the frequency of the wind farm grid connection point is detected in real time, compared with the rated frequency of the system, and a primary frequency regulation control state is obtained.

[0073] Take the frequency value f of the last moment of the network point mea_last =f. Assume that the frequency comparison judgment period is T, such as T = 20 milliseconds. When the judgment interval time arrives, the current frequency value f of the node is taken. mea_curren t =f.

[0074] If |f mea_last -f n |<f d ,|f mea_curren t -f n |≥f d , record the frequency modulation control state as "from no action to action rising edge";

[0075] If |f mea_last -f n |≥f d ,|f mea_curren t -f n |≥f d , record the frequency modulation control status as "actuated";

[0076] If |f mea_last -f n |≥f d ,|f mea_curren t -f n |<f d, record the frequency modulation control state as "from action to reset falling edge";

[0077] If |f mea_last -f n |<f d ,|f mea_curren t -f n |<f d , record the frequency modulation control status as "restored".

[0078] After the above comparison, let f mea_last =f mea_curren t .

[0079] Here, f is the real-time value of the grid connection point frequency, f n is the rated frequency of the system, f d It is the primary frequency regulation dead zone of the wind farm.

[0080] In step 2, the wind farm grid connection point and the reference value of active power distribution of the wind turbine are determined according to the AGC adjustment signal, the primary frequency regulation signal, and the time required for a single adjustment of the wind turbine.

[0081] If the AGC regulation start signal is not received before a frequency regulation action, compare the current frequency regulation action time with the previous frequency regulation end time. If the time interval between the two is less than the time required for a single regulation of the wind turbine, the active power at the time of the previous frequency regulation action is taken as the allocation reference value; if the time interval between the two is greater than or equal to the time required for a single regulation of the wind turbine, the active power at the current time is taken as the allocation reference value;

[0082] If an AGC regulation start signal is received before a frequency regulation action, compare the frequency regulation action time with the AGC regulation start time. If the time interval between the two is less than the time required for a single regulation of the wind turbine, the active power at the start time of the AGC regulation is taken as the allocation reference value; if the time interval between the two is greater than or equal to the time required for a single regulation of the wind turbine, the active power at the current time is taken as the allocation reference value.

[0083] In step 3, the active power target value of the primary frequency modulation at the grid connection point is calculated according to the active frequency droop characteristics, the active power adjustment amount of the primary frequency modulation is obtained based on the active power distribution reference value of the grid connection point, the loss corresponding to the active power adjustment amount is calculated through the neural network model, and the active power adjustment amount of the primary frequency modulation at the grid connection point is corrected.

[0084] According to the active frequency droop characteristics, the active power target value of the primary frequency regulation at the grid connection point is calculated. Among them, P n is the rated power of the grid-connected point; P init is the initial value of active power at the grid connection point; δ% is the regulation rate.

[0085] According to the primary frequency modulation active power target value of the grid connection point and the active power distribution reference value P of the grid connection point pcc_ref , calculate the primary frequency modulation active power regulation ΔP of the grid connection point pcc =P target -P pcc_ref .

[0086] A BP neural network model is constructed, including an input layer, a hidden layer and an output layer. The input layer has three input nodes, corresponding to the active power of the grid connection point, the reactive power of the grid connection point and the ambient temperature respectively; the output layer has one output node, corresponding to the active power loss of the grid connection point; the hidden layer is connected to the input layer and the output layer according to the preset connection weights.

[0087] The active power, reactive power, ambient temperature and active power loss historical data of the grid connection point are obtained as training samples, and the neural network model is trained to obtain the corresponding relationship between the grid connection point operation data and the active power loss.

[0088] Here, the active power loss data of the grid connection point can be obtained by the difference between the active power of the grid connection point and the active power of the wind turbine.

[0089] The active power target value of primary frequency modulation, the reactive power of the grid connection point at the time of primary frequency modulation action and the ambient temperature are input into the model, and the loss P corresponding to the active power target value of primary frequency modulation at the grid connection point is obtained through the model output. target_los s .

[0090] Since a frequency modulation action lasts for a short time (generally no more than 60 seconds), the reactive power and ambient temperature of the grid connection point change very little during this process. Therefore, the reactive power and ambient temperature of the grid connection point at the time of the action can be taken as the neural network input.

[0091] Take the loss P corresponding to the reference value of active power distribution of primary frequency modulation at the grid point pcc_ref_lo ss It is equal to the difference between the active power distribution reference value of the grid connection point and the active power distribution reference value of the wind turbine.

[0092] Calculate the loss P corresponding to the active power regulation of the primary frequency modulation at the grid connection point change_los s =P target_los s -P pcc_ref_lo ss

[0093] According to ΔP' pcc =ΔP pcc +P change_los The corrected primary frequency modulation active power regulation amount of the grid connection point is obtained.

[0094] In step 4, based on the operating status of the wind turbines and other conditions, the primary frequency regulation active power adjustment amount is allocated, and the allocation result is sent to each wind turbine.

[0095] The primary frequency regulation active power regulation amount at the grid connection point is distributed among the wind turbines. For wind turbines with the same capacity, it can be distributed according to the priority order or the proportional coefficient; for wind turbines with different capacities, it can be distributed according to equal active capacity or equal active margin.

[0096] If the primary frequency modulation control state is "from never acting to the rising edge of acting", first send a primary frequency modulation active power instruction to the wind turbine through remote adjustment, and after a preset delay time, such as 100 milliseconds, send a primary frequency modulation enable flag control word through remote adjustment or remote control to start the primary frequency modulation instruction;

[0097] If the primary frequency regulation control state is "from action to reset falling edge", send the primary frequency regulation stop enable flag control word to the wind turbine through remote adjustment or remote control to stop the primary frequency regulation instruction and return the control of the wind turbine to the AGC;

[0098] If the primary frequency modulation control state is "actuated", start the primary frequency modulation enabling control cycle timer. When the primary frequency modulation enabling control cycle timer completes the timing, send the primary frequency modulation enabling flag control word to the wind turbine to ensure that the wind turbine can normally execute the primary frequency modulation instruction.

[0099] If the primary frequency regulation control status is "restored", start the primary frequency regulation stop enable control cycle timer. When the primary frequency regulation stop enable control cycle timer completes the timing, send the primary frequency regulation stop enable flag control word to the wind turbine to ensure that the wind turbine no longer executes the primary frequency regulation instruction.

[0100] The primary frequency modulation control method of the wind farm described above predicts the active power loss according to the data of the wind farm grid connection point active power, grid connection point reactive power, ambient temperature, etc., avoids the inaccuracy caused by using only active power, and improves the accuracy of active power loss calculation; according to the time interval with AGC adjustment and the time interval with the last primary frequency modulation adjustment when the primary frequency modulation instruction is allocated, the active power at different times is selected as the allocation reference value, so as to solve the problem of asynchronous refresh of the active power of the grid connection point and the active power of the wind turbine, so that the active power distribution is consistent with the actual power distribution. The matching result is more accurate, and the adjustment accuracy of the primary frequency regulation is improved; by periodically sending the primary frequency regulation enable flag control word to the wind turbine during the primary frequency regulation action, the wind turbine can correctly execute the primary frequency regulation instruction and meet the grid dispatching requirements for the primary frequency regulation integral power and other assessment indicators; after the primary frequency regulation is restored, the primary frequency regulation stop enable flag control word is periodically sent to the wind turbine to ensure that the wind turbine can reliably switch from the primary frequency regulation control to the AGC control, so as to avoid the over-generation of the AGC due to the uncontrolled wind turbine, resulting in the shutdown of the entire field.

[0101] Based on the same inventive concept, this embodiment also provides a wind farm frequency active support control system, such as Figure 2 As shown, including:

[0102] The primary frequency regulation control state judgment module is used to detect the frequency of the wind farm grid connection point in real time, compare it with the system rated frequency, and obtain the primary frequency regulation control state of the grid connection point;

[0103] An active power distribution reference value determination module is used to determine the grid connection point and the active power distribution reference value of the wind turbine generator set according to the AGC adjustment signal, the primary frequency regulation signal and the time required for a single adjustment of the wind turbine generator set;

[0104] The grid connection point active power regulation amount determination module is used to calculate the grid connection point primary frequency modulation active power target value according to the active frequency droop characteristics, obtain the primary frequency modulation active power regulation amount based on the grid connection point active power distribution reference value, calculate the loss corresponding to the grid connection point primary frequency modulation active power regulation amount through the neural network model, and correct the grid connection point primary frequency modulation active power regulation amount;

[0105] The wind turbine active power control module is used to distribute the corrected grid-connected point primary frequency regulation active power adjustment amount according to the primary frequency regulation control state of the wind turbine, and send the distribution result to each wind turbine.

[0106] Among them, the frequency of the wind farm grid connection point is detected in real time and compared with the rated frequency of the system to obtain the primary frequency regulation control state including:

[0107] Take the frequency value f of the last moment of the network point mea_last=f. Assume that the frequency comparison judgment period is T, such as T = 20 milliseconds. When the judgment interval time arrives, the current frequency value f of the node is taken. mea_curren t =f.

[0108] If |f mea_last -f n |<f d ,|f mea_curren t -f n |≥f d , record the frequency modulation control state as "from no action to action rising edge";

[0109] If |f mea_last -f n |≥f d ,|f mea_curren t -f n |≥f d , record the frequency modulation control status as "actuated";

[0110] If |f mea_last -f n |≥f d ,|f mea_curren t -f n |<f d , record the frequency modulation control state as "from action to reset falling edge";

[0111] If |f mea_last -f n |<f d ,|f mea_curren t -f n |<f d , record the frequency modulation control status as "restored".

[0112] After the above comparison, let f mea_last =f mea_curren t .

[0113] Here, f is the real-time value of the grid connection point frequency, f n is the rated frequency of the system, f d It is the primary frequency regulation dead zone of the wind farm.

[0114] Among them, according to the AGC regulation signal, the primary frequency regulation signal, and the time required for a single regulation of the wind turbine, the wind farm grid connection point and the reference value of the active power distribution of the wind turbine are determined, including:

[0115] If the AGC regulation start signal is not received before a frequency regulation action, compare the current frequency regulation action time with the previous frequency regulation end time. If the time interval between the two is less than the time required for a single regulation of the wind turbine, the active power at the time of the previous frequency regulation action is taken as the allocation reference value; if the time interval between the two is greater than or equal to the time required for a single regulation of the wind turbine, the active power at the current time is taken as the allocation reference value;

[0116] If an AGC regulation start signal is received before a frequency regulation action, compare the frequency regulation action time with the AGC regulation start time. If the time interval between the two is less than the time required for a single regulation of the wind turbine, the active power at the start time of the AGC regulation is taken as the allocation reference value; if the time interval between the two is greater than or equal to the time required for a single regulation of the wind turbine, the active power at the current time is taken as the allocation reference value.

[0117] Among them, the active power target value of the primary frequency modulation at the grid connection point is calculated according to the active frequency droop characteristics, the active power adjustment amount of the primary frequency modulation is obtained based on the active power distribution reference value of the grid connection point, the loss corresponding to the active power adjustment amount is calculated through the neural network model, and the active power adjustment amount of the primary frequency modulation at the grid connection point is corrected, including:

[0118] Assume that the primary frequency modulation active power target value of the grid connection point is P target , then the primary frequency modulation active power regulation ΔP pcc =P target -P pcc_ref , P pcc_ref Allocate reference value for active power at the grid connection point.

[0119] A BP neural network model is constructed, including an input layer, a hidden layer and an output layer. The input layer has three input nodes, corresponding to the active power of the grid connection point, the reactive power of the grid connection point and the ambient temperature respectively; the output layer has one output node, corresponding to the active power loss of the grid connection point; the hidden layer is connected to the input layer and the output layer according to the preset connection weights.

[0120] The active power, reactive power, ambient temperature and active power loss historical data of the grid connection point are obtained as training samples, and the neural network model is trained to obtain the corresponding relationship between the grid connection point operation data and the active power loss.

[0121] Here, the active power loss data of the grid connection point can be obtained by the difference between the active power of the grid connection point and the active power of the wind turbine.

[0122] The active power target value of primary frequency modulation, the reactive power of the grid connection point at the time of primary frequency modulation action and the ambient temperature are input into the model, and the loss P corresponding to the active power target value of primary frequency modulation at the grid connection point is obtained through the model output. target_los s .

[0123] Since a frequency modulation action lasts for a short time (generally no more than 60 seconds), the reactive power and ambient temperature of the grid connection point change very little during this process. Therefore, the reactive power and ambient temperature of the grid connection point at the time of the action can be taken as the neural network input.

[0124] Take the loss P corresponding to the reference value of active power distribution of primary frequency modulation at the grid point pcc_ref_lo ss It is equal to the difference between the active power distribution reference value of the grid connection point and the active power distribution reference value of the wind turbine.

[0125] Calculate the loss P corresponding to the active power regulation of the primary frequency modulation at the grid connection point change_los s =P target_los s -P pcc_ref_lo ss

[0126] According to ΔP' pcc =ΔP pcc +P change_los The corrected primary frequency modulation active power regulation amount of the grid connection point is obtained.

[0127] Among them, based on the operating status of the wind turbines and other conditions, the primary frequency regulation active power adjustment amount is allocated, and the allocation results are sent to each wind turbine, including:

[0128] The primary frequency regulation active power regulation amount at the grid connection point is distributed among the wind turbines. For wind turbines with the same capacity, it can be distributed according to the priority order or the proportional coefficient; for wind turbines with different capacities, it can be distributed according to equal active capacity or equal active margin.

[0129] If the primary frequency modulation control state is "from never acting to the rising edge of acting", first send a primary frequency modulation active power instruction to the wind turbine through remote adjustment, and after a preset delay time, such as 100 milliseconds, send a primary frequency modulation enable flag control word through remote adjustment or remote control to start the primary frequency modulation instruction;

[0130] If the primary frequency regulation control state is "from action to reset falling edge", send the primary frequency regulation stop enable flag control word to the wind turbine through remote adjustment or remote control to stop the primary frequency regulation instruction and return the control of the wind turbine to the AGC;

[0131] If the primary frequency modulation control state is "actuated", start the primary frequency modulation enabling control cycle timer. When the primary frequency modulation enabling control cycle timer completes the timing, send the primary frequency modulation enabling flag control word to the wind turbine to ensure that the wind turbine can normally execute the primary frequency modulation instruction.

[0132] If the primary frequency regulation control status is "restored", start the primary frequency regulation stop enable control cycle timer. When the primary frequency regulation stop enable control cycle timer completes the timing, send the primary frequency regulation stop enable flag control word to the wind turbine to ensure that the wind turbine no longer executes the primary frequency regulation instruction.

[0133] Based on the same inventive concept, this embodiment also provides a computing device, including: one or more processors, one or more memories and one or more programs, wherein the programs are stored in the memories and configured to be executed by the processors, and when the programs are loaded into the processors, the steps of the wind farm frequency active support control method described in any one of the above items are implemented.

[0134] Based on the same inventive concept, this embodiment also provides a storage medium, which stores a computer program, and the computer program includes program instructions. When the program instructions are executed by a processor, the processor executes the steps of the wind farm frequency active support control method according to any one of the above items.

[0135] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, devices (systems), computer equipment or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0136] The present invention is described with reference to a flowchart of a method according to an embodiment of the present invention. It should be understood that each process in the flowchart and a combination of processes in the flowchart can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the process in the flowchart. Figure 1 A device that specifies functions in a process or multiple processes.

[0137] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A function specified in a process or multiple processes.

[0138] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 The steps of a specified function in a process or multiple processes.

Claims

1. A wind farm frequency active support control method, characterized in that: include: Real-time detection of the wind farm grid connection point frequency, comparison with the system rated frequency, and obtaining the primary frequency regulation control status of the grid connection point; Determine the grid connection point and the reference value of active power distribution of wind turbines according to the AGC regulation signal, the primary frequency regulation signal and the time required for a single regulation of the wind turbines; The active power target value of the primary frequency modulation at the grid connection point is calculated according to the active frequency droop characteristic, the active power adjustment amount of the primary frequency modulation is obtained based on the active power distribution reference value of the grid connection point, the loss corresponding to the active power adjustment amount of the primary frequency modulation at the grid connection point is calculated through the neural network model, and the active power adjustment amount of the primary frequency modulation at the grid connection point is corrected; According to the primary frequency regulation control state of the wind turbine generator set, the corrected primary frequency regulation active power regulation amount of the grid connection point is distributed, and the distribution result is sent to each wind turbine generator set.

2. The wind farm frequency active support control method according to claim 1, characterized in that: The real-time detection of the wind farm grid connection point frequency and comparison with the system rated frequency to obtain the primary frequency regulation control state of the grid connection point includes: Take the frequency value f of the last moment of the network point mea_last is the real-time value of the frequency of the grid connection point; suppose the frequency comparison judgment period is T, when the judgment interval time arrives, take the current frequency value of the grid connection point f mea_current It is the real-time value of the frequency of the grid connection point; If |f mea_last -f n | <f d ,|f mea_current -f n |≥f d , then the frequency modulation control state is recorded as: from no action to action rising edge; If |f mea_last -f n |≥f d ,|f mea_current -f n |≥f d , then the primary frequency modulation control state is recorded as: acted; If |f mea_last -f n |≥f d ,|f mea_current -f n | <f d , then the frequency modulation control state is recorded as: from action to reset falling edge; If |f mea_last -f n | <f d ,|f mea_current -f n | <f d , then the primary frequency modulation control state is recorded as: restored; Among them, f n is the rated frequency of the system, f d It is the primary frequency regulation dead zone of the wind farm; After completing the comparison, let f mea_last =f mea_current .

3. The wind farm frequency active support control method according to claim 1, characterized in that: Determining the grid connection point and the reference value of active power distribution of the wind turbine generator set according to the AGC adjustment signal, the primary frequency adjustment signal, and the time required for a single adjustment of the wind turbine generator set includes: If the AGC regulation start signal is not received before a frequency regulation action, compare the current frequency regulation action time with the previous frequency regulation end time. If the time interval between the two is less than the time required for a single regulation of the wind turbine, the active power at the time of the previous frequency regulation action is taken as the allocation reference value; if the time interval between the two is greater than or equal to the time required for a single regulation of the wind turbine, the active power at the current time is taken as the allocation reference value; If an AGC regulation start signal is received before a frequency regulation action, compare the frequency regulation action time with the AGC regulation start time. If the time interval between the two is less than the time required for a single regulation of the wind turbine, the active power at the start time of the AGC regulation is taken as the allocation reference value; if the time interval between the two is greater than or equal to the time required for a single regulation of the wind turbine, the active power at the current time is taken as the allocation reference value.

4. The wind farm frequency active support control method according to claim 1, characterized in that: The method comprises: calculating the primary frequency modulation active power target value of the grid connection point according to the active frequency droop characteristic, obtaining the primary frequency modulation active power adjustment amount based on the grid connection point active power distribution reference value, calculating the loss corresponding to the primary frequency modulation active power adjustment amount of the grid connection point through a neural network model, and correcting the primary frequency modulation active power adjustment amount of the grid connection point, including: Calculate the active power target value P of the primary frequency modulation at the grid connection point according to the active frequency droop characteristics target , then the primary frequency modulation active power regulation ΔP pcc =P target -P pcc_ref , P pcc_ref Allocate reference value for active power at the grid connection point; Obtain the historical data of active power, reactive power, ambient temperature and active power loss of the grid connection point as training samples, train the neural network model and obtain the corresponding relationship between the grid connection point operation data and active power loss; the active power loss of the grid connection point is obtained by the difference between the active power of the grid connection point and the active power of the wind turbine; The active power target value of primary frequency modulation, the reactive power of the grid connection point at the time of primary frequency modulation action and the ambient temperature are input into the model, and the loss P corresponding to the active power target value of primary frequency modulation at the grid connection point is obtained through the model output. target_loss ; Take the loss P corresponding to the reference value of active power distribution of primary frequency modulation at the grid point pcc_ref_loss It is equal to the difference between the active power distribution reference value of the grid connection point and the active power distribution reference value of the wind turbine generator set; Calculate the loss P corresponding to the active power regulation of the primary frequency modulation at the grid connection point change_loss =P target_loss -P pcc_ref_loss ; Calculate the corrected active power regulation of the primary frequency modulation at the grid connection point ΔP ′ pcc =ΔP pcc +P change_loss .

5. The wind farm frequency active support control method according to claim 1, characterized in that: The method allocates the corrected primary frequency regulation active power adjustment amount of the grid connection point according to the primary frequency regulation control state of the wind turbine generator set, and sends the allocation result to each wind turbine generator set, including: If the primary frequency modulation control state is: from no action to action rising edge, first send a primary frequency modulation active power instruction to the wind turbine through remote adjustment, and after a preset delay time, send a primary frequency modulation enable flag control word through remote adjustment or remote control to start the primary frequency modulation instruction; If the primary frequency regulation control state is: from action to reset falling edge, the primary frequency regulation stop enable flag control word is sent to the wind turbine through remote adjustment or remote control, the primary frequency regulation instruction is stopped, and the control right of the wind turbine is returned to the AGC; If the primary frequency modulation control state is: acted, then the primary frequency modulation enabling control cycle timer is started. When the primary frequency modulation enabling control cycle timer completes the timing, the primary frequency modulation enabling flag control word is sent to the wind turbine to ensure that the wind turbine can normally execute the primary frequency modulation instruction. If the primary frequency modulation control state is: restored, start the primary frequency modulation stop enable control cycle timer. When the primary frequency modulation stop enable control cycle timer completes the timing, send the primary frequency modulation stop enable flag control word to the wind turbine to ensure that the wind turbine no longer executes the primary frequency modulation instruction.

6. A wind farm frequency active support control system, characterized in that: include: The primary frequency regulation control state judgment module is used to detect the frequency of the wind farm grid connection point in real time, compare it with the system rated frequency, and obtain the primary frequency regulation control state of the grid connection point; An active power distribution reference value determination module is used to determine the grid connection point and the active power distribution reference value of the wind turbine generator set according to the AGC adjustment signal, the primary frequency regulation signal and the time required for a single adjustment of the wind turbine generator set; The grid connection point active power regulation amount determination module is used to calculate the grid connection point primary frequency modulation active power target value according to the active frequency droop characteristics, obtain the primary frequency modulation active power regulation amount based on the grid connection point active power distribution reference value, calculate the loss corresponding to the grid connection point primary frequency modulation active power regulation amount through the neural network model, and correct the grid connection point primary frequency modulation active power regulation amount; The wind turbine active power control module is used to distribute the corrected grid-connected point primary frequency regulation active power adjustment amount according to the primary frequency regulation control state of the wind turbine, and send the distribution result to each wind turbine.

7. The wind farm frequency active support control system according to claim 6, characterized in that: The primary frequency regulation control state judgment module is used to detect the frequency of the wind farm grid connection point in real time, compare it with the system rated frequency, and obtain the primary frequency regulation control state of the grid connection point, including: Take the frequency value f of the last moment of the network point mea_last is the real-time value of the frequency of the grid connection point; suppose the frequency comparison judgment period is T, when the judgment interval time arrives, take the current frequency value of the grid connection point f mea_current It is the real-time value of the frequency of the grid connection point; If |f mea_last -f n | <f d ,|f mea_current -f n |≥f d , then the frequency modulation control state is recorded as: from no action to action rising edge; If |f mea_last -f n |≥f d ,|f mea_current -f n |≥f d , then the primary frequency modulation control state is recorded as: acted; If |f mea_last -f n |≥f d ,|f mea_current -f n | <f d , then the frequency modulation control state is recorded as: from action to reset falling edge; If |f mea_last -f n | <f d ,|f mea_current -f n | <f d , then the primary frequency modulation control state is recorded as: restored; Among them, f n is the rated frequency of the system, f d It is the primary frequency regulation dead zone of the wind farm; After completing the comparison, let f mea_last =f mea_current .

8. The wind farm frequency active support control system according to claim 6, characterized in that: The active power distribution reference value determination module is used to determine the grid connection point and the active power distribution reference value of the wind turbine generator set according to the AGC adjustment signal, the primary frequency regulation signal, and the time required for a single adjustment of the wind turbine generator set, including: If the AGC regulation start signal is not received before a frequency regulation action, compare the current frequency regulation action time with the previous frequency regulation end time. If the time interval between the two is less than the time required for a single regulation of the wind turbine, the active power at the time of the previous frequency regulation action is taken as the allocation reference value; if the time interval between the two is greater than or equal to the time required for a single regulation of the wind turbine, the active power at the current time is taken as the allocation reference value; If an AGC regulation start signal is received before a frequency regulation action, compare the frequency regulation action time with the AGC regulation start time. If the time interval between the two is less than the time required for a single regulation of the wind turbine, the active power at the start time of the AGC regulation is taken as the allocation reference value; if the time interval between the two is greater than or equal to the time required for a single regulation of the wind turbine, the active power at the current time is taken as the allocation reference value.

9. The wind farm frequency active support control system according to claim 6, characterized in that: The grid connection point active power regulation amount determination module is used to calculate the grid connection point primary frequency modulation active power target value according to the active frequency droop characteristic, obtain the primary frequency modulation active power regulation amount based on the grid connection point active power distribution reference value, calculate the loss corresponding to the grid connection point primary frequency modulation active power regulation amount through the neural network model, and correct the grid connection point primary frequency modulation active power regulation amount, including: Calculate the active power target value P of the primary frequency modulation at the grid connection point according to the active frequency droop characteristics target , then the primary frequency modulation active power regulation ΔP pcc =P target -P pcc_ref , P pcc_ref Allocate reference value for active power at the grid connection point; Obtain the historical data of active power, reactive power, ambient temperature and active power loss of the grid connection point as training samples, train the neural network model and obtain the corresponding relationship between the grid connection point operation data and active power loss; the active power loss of the grid connection point is obtained by the difference between the active power of the grid connection point and the active power of the wind turbine; The active power target value of primary frequency modulation, the reactive power of the grid connection point at the time of primary frequency modulation action and the ambient temperature are input into the model, and the loss P corresponding to the active power target value of primary frequency modulation at the grid connection point is obtained through the model output. target_loss ; Take the loss P corresponding to the reference value of active power distribution of primary frequency modulation at the grid point pcc_ref_loss It is equal to the difference between the active power distribution reference value of the grid connection point and the active power distribution reference value of the wind turbine generator set; Calculate the loss P corresponding to the active power regulation of the primary frequency modulation at the grid connection point change_loss =P target_loss -P pcc_ref_loss ; Calculate the corrected active power regulation of the primary frequency modulation at the grid connection point ΔP ′ pcc =ΔP pcc +P change_loss .

10. The wind farm frequency active support control system according to claim 6, characterized in that: The method allocates the corrected primary frequency regulation active power adjustment amount of the grid connection point according to the primary frequency regulation control state of the wind turbine generator set, and sends the allocation result to each wind turbine generator set, including: If the primary frequency modulation control state is: from no action to action rising edge, first send a primary frequency modulation active power instruction to the wind turbine through remote adjustment, and after a preset delay time, send a primary frequency modulation enable flag control word through remote adjustment or remote control to start the primary frequency modulation instruction; If the primary frequency regulation control state is: from action to reset falling edge, the primary frequency regulation stop enable flag control word is sent to the wind turbine through remote adjustment or remote control, the primary frequency regulation instruction is stopped, and the control right of the wind turbine is returned to the AGC; If the primary frequency modulation control state is: acted, then the primary frequency modulation enabling control cycle timer is started. When the primary frequency modulation enabling control cycle timer completes the timing, the primary frequency modulation enabling flag control word is sent to the wind turbine to ensure that the wind turbine can normally execute the primary frequency modulation instruction. If the primary frequency modulation control state is: restored, start the primary frequency modulation stop enable control cycle timer. When the primary frequency modulation stop enable control cycle timer completes the timing, send the primary frequency modulation stop enable flag control word to the wind turbine to ensure that the wind turbine no longer executes the primary frequency modulation instruction.

11. A computing device, characterized in that: include: One or more processors, one or more memories, and one or more programs, wherein the programs are stored in the memories and configured to be executed by the processors, and when the programs are loaded into the processors, the steps of the wind farm frequency active support control method according to any one of claims 1 to 5 are implemented.

12. A storage medium, characterized in that: The storage medium stores a computer program, which includes program instructions. When the program instructions are executed by a processor, the processor executes the steps of the wind farm frequency active support control method according to any one of claims 1 to 5.

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