Rapid voltage control device and method for wind power plant

Abstract

The invention provides a rapid voltage control device and method for a wind power plant, and belongs to the field of new energy power generation, and the device comprises an AVC voltage control function module, a rapid voltage control function module, an AVC function soft pressing plate, a rapid voltage regulation soft pressing plate, a soft pressing plate switching module, a reactive power distribution strategy and algorithm module, and a remote regulation output port. A target voltage value is respectively input into an AVC voltage control function module, a fast voltage control function module, an AVC function soft pressing plate and a fast voltage regulation soft pressing plate, output signals of the AVC function soft pressing plate and the fast voltage regulation soft pressing plate are respectively input into a soft pressing plate switching module for logic combination operation, and output signals of the soft pressing plate switching module are respectively input into the AVC function soft pressing plate and the fast voltage regulation soft pressing plate. The AVC voltage control function module or the rapid voltage control function module is operated, a reactive power remote regulation total instruction is calculated and sent to the reactive power distribution strategy and algorithm module, the size of reactive power needing to be compensated is calculated, and the reactive power is output through a remote regulation output port; and the voltage can be quickly and stably adjusted to a target value.

Description

Technical Field

[0001] The present invention relates to the technical field of renewable energy power generation, and in particular to a wind farm rapid voltage control device and method. Background Art

[0002] Wind power generation has developed rapidly in recent years due to its advantages of being green, low-carbon, easy to obtain energy and high economy. However, the volatility of its output affects the stability of the power system. To address this problem, research on automatic voltage control (AVC) technology based on wind power generation has been launched. AVC is based on a dispatching automation platform, which monitors and adjusts the on-load tap-changing transformers and reactive compensation devices of substations in real time, optimizes the distribution of reactive power, and reduces the loss of reactive current on the transmission line, thereby maintaining the stability of the grid voltage quality. The overall framework structure of AVC includes a data acquisition and monitoring control system, a measurement processing unit, a locking processing unit, an automatic partitioning unit, a control strategy calculation unit and a remote adjustment interface. Among them, the control strategy calculation unit is the core part of the system, which monitors the voltage, reactive power and other parameters of the grid in real time, and calculates according to the planned voltage curve, and controls and dispatches various transformers and reactive compensation devices in the region according to the principle of partition control.

[0003] However, AVC control has problems such as long control cycle and slow reactive power response speed. When the substation receives the dispatch instruction, due to the lag in the response of the reactive equipment, the voltage takes too long to reach the desired regulation time, and the fluctuation of the grid voltage cannot be handled in time, which will affect the voltage effect of the stable operation of the grid. Summary of the invention

[0004] The technical problem to be solved by the present invention is how to solve the problem that the existing AVC control cannot handle the grid voltage fluctuation in time.

[0005] The present invention solves the above technical problems through the following technical solutions: a wind farm rapid voltage control device, including an AVC voltage control function module, a rapid voltage control function module, an AVC function soft pressure plate, a rapid voltage regulation soft pressure plate, a soft pressure plate throw-in / out module, a reactive power distribution strategy and algorithm module, and a remote control output port. The target voltage values ​​are respectively input into the AVC voltage control function module and the rapid voltage control function module. The output signals of the AVC function soft pressure plate and the rapid voltage regulation soft pressure plate are respectively input into the soft pressure plate throw-in / out module for logical combination operation. The output signals of the soft pressure plate throw-in / out module are respectively input into the AVC function soft pressure plate and the rapid voltage regulation soft pressure plate, and the AVC voltage control function module or the rapid voltage control function module is selected to run. When the AVC voltage control function module or the rapid voltage control function module is running, the reactive power remote control total instruction is calculated and sent to the reactive power distribution strategy and algorithm module. The reactive power required to be compensated is calculated by the reactive power distribution strategy and algorithm module, and outputted through the remote control output port.

[0006] The present invention adds a fast voltage control function module on the basis of the conventional AVC voltage control function module, and selects to operate a control mode of the AVC voltage control function module and the fast voltage control function module through the AVC function soft pressure plate and the fast voltage regulation soft pressure plate switching. When switched to the fast voltage control mode, the voltage is adjusted quickly and steadily to the target value by setting the voltage adjustment step size, using a small adjustment voltage and a short adjustment time, which can suppress voltage fluctuations and has a faster reactive power response speed.

[0007] Preferably, the target voltage value is obtained by parsing the voltage curve instruction, and the voltage curve instruction includes a remote dispatch voltage instruction and a local curve voltage instruction. The parsed target voltage value, fixed value, and signal logic are respectively transmitted in parallel to the AVC voltage control function module and the fast voltage control function module through the input port.

[0008] Preferably, the soft pressure plate throw-in / out module includes a first AND gate, a second AND gate, and a NOT gate. The output end of the AVC function soft pressure plate is respectively connected to the input end of the first AND gate and the input end of the second AND gate. The output end of the fast voltage regulation soft pressure plate is respectively connected to the input end of the NOT gate and the input end of the second AND gate. The output end of the NOT gate is connected to the input end of the first AND gate. The output end of the first AND gate is connected to the input end of the AVC voltage control function module, and the output end of the second AND gate is connected to the input end of the fast voltage control function module.

[0009] The present invention also provides a control method based on the wind farm rapid voltage control device, the control method comprising the following steps:

[0010] Step 1: Control the output signals of the AVC soft pressure plate and the fast voltage regulating soft pressure plate, and run the AVC voltage control function module or the fast voltage control function module. When the fast voltage control function module is run, monitor the bus voltage in real time and obtain the measured value of the bus voltage U0, and calculate the target voltage value U t The voltage difference dU with the measured value of bus voltage U0, dU = U t -U0;

[0011] Step 2: Determine whether the voltage difference dU exceeds the voltage control dead zone. If yes, go to step 3; if no, go back to step 1.

[0012] Step 3: Determine whether the measured value of the bus voltage U0 is within the range of the high lockout threshold and the low lockout threshold. If so, proceed to step 4; if not, enter the lockout state.

[0013] Step 4: Calculate the reactive power regulation dQ, and constrain the single voltage regulation and single reactive power regulation. Based on the reactive power regulation dQ, calculate the total reactive power remote regulation instruction Q. t And send it to the reactive power distribution strategy and algorithm module, which calculates the reactive power to be compensated and outputs it through the remote control output port.

[0014] Preferably, in step 1, when the AVC function soft pressure plate is put into operation and the fast voltage regulation soft pressure plate is exited, the AVC voltage control function module is run; when the AVC function soft pressure plate is put into operation and the fast voltage regulation soft pressure plate is put into operation, the fast voltage control function module is run.

[0015] Preferably, after entering the locked state in step 3, continue to determine whether to release the lock, if so, return to step 1 to determine whether the voltage difference dU exceeds the voltage control dead zone, if not, maintain the locked state.

[0016] Preferably, the total reactive power remote control command Q t The calculation formula is:

[0017] Q t =Q0+dQ

[0018] dQ=dU×X

[0019] Among them, Q0 is the initial reactive power command value, dU is the single voltage regulation value, and X is the system reactance value.

[0020] Preferably, in step 4, the single reactive adjustment amount = min{AVC single voltage adjustment amount×voltage adjustment coefficient; AVC single maximum reactive adjustment amount}.

[0021] Preferably, the reactive power allocation strategy and algorithm module in step 4 is based on the reactive power remote adjustment total instruction Q tThe reactive power distribution strategy implemented includes two cases:

[0022] The first case is: when the target voltage value U t If the current output of SVG is positive, the fan output is increased; if the current output of SVG is negative, the SVG output is increased;

[0023] The second case is: when the target voltage value U t If the SVG is currently positive, the SVG output is reduced; if the SVG is currently negative, the fan output is reduced.

[0024] Preferably, the reactive power allocation strategy and the reactive power allocation algorithm adopted by the algorithm module in step 4 are equal margin allocation, equal output allocation, or equal power factor allocation.

[0025] The advantages provided by the present invention are:

[0026] (1) The present invention adds a fast voltage control function module on the basis of the conventional AVC voltage control function module, and selects to operate a control mode of the AVC voltage control function module and the fast voltage control function module through the AVC function soft pressure plate and the fast voltage regulation soft pressure plate switching. When switched to the fast voltage control mode, by setting the voltage regulation step, a small regulation voltage and a short regulation time are used to achieve fast and steady voltage regulation to the target value, which can suppress voltage fluctuations and has a faster reactive power response speed.

[0027] (2) The reactive power distribution strategy of the present invention gives priority to wind turbines when the power grid is in a steady state, making full use of the reactive power regulation capability of the wind turbines to regulate the voltage. When the reactive power regulation capability of the wind turbines is insufficient, reactive power regulation is performed through SVG devices, which can reduce the number of SVGs required for reactive power compensation of the system and improve the flexibility of reactive power and voltage regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of a wind farm rapid voltage control device provided by an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of the deployment of a wind farm rapid voltage control device provided by an embodiment of the present invention;

[0030] Figure 3 A flow chart of switching to rapid voltage control in a wind farm rapid voltage control method provided by an embodiment of the present invention;

[0031] Figure 4 This is the conventional AVC voltage regulation action of the wind farm;

[0032] Figure 5 It is the fast AVC voltage regulation action of the wind farm;

[0033] Figure 6 The operation process of the wind farm rapid voltage control method provided by the embodiment of the present invention;

[0034] Figure 7 The wind farm rapid voltage control method provided by the embodiment of the present invention does not work in the case of bus voltage disturbance;

[0035] Figure 8 The automatic voltage regulation process of the wind farm rapid voltage control method provided by the embodiment of the present invention;

[0036] In the figure: 10 AVC voltage control function module, 20 fast voltage control function module, 30 AVC function soft pressure plate, 40 fast voltage regulation soft pressure plate, 50 soft pressure plate activation and deactivation module, 51 first AND gate, 52 second AND gate, 53 NOT gate, 60 reactive power distribution strategy and algorithm module, 70 remote control output port. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the technical solution of the present invention is clearly and completely described below in combination with specific embodiments and with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Example 1

[0039] like Figure 1 As shown, this embodiment provides a wind farm fast voltage control device, including an AVC voltage control function module 10, a fast voltage control function module 20, an AVC function soft pressure plate 30, a fast voltage regulation soft pressure plate 40, a soft pressure plate throw-in / out module 50, a reactive power distribution strategy and algorithm module 60, a remote adjustment output port 70, and a target voltage value U t The AVC voltage control function module 10 and the fast voltage control function module 20 are respectively input, and the output signals of the AVC function soft pressure plate 30 and the fast voltage regulation soft pressure plate 40 are respectively input into the soft pressure plate throw-in / out module 50 for logic combination operation. The output signals of the soft pressure plate throw-in / out module 50 are respectively input into the AVC function soft pressure plate 30 and the fast voltage regulation soft pressure plate 40, and the AVC voltage control function module 10 or the fast voltage control function module 20 is selected to run. When the AVC voltage control function module 10 or the fast voltage control function module 20 is running, the total reactive power remote adjustment instruction is calculated and sent to the reactive power distribution strategy and algorithm module 60. The reactive power required to be compensated is calculated by the reactive power distribution strategy and algorithm module 60, and outputted through the remote adjustment output port 70.

[0040] Target voltage value U t The voltage curve command is obtained by parsing the voltage curve command, which includes the remote dispatch voltage command and the local curve voltage command. The target voltage value U after parsing is t , fixed value, and signal logic are respectively transmitted in parallel to the AVC voltage control function module 10 and the fast voltage control function module 20 through the input ports.

[0041] The soft pressure plate throw-in / out module 50 comprises a first AND gate 51, a second AND gate 52, and a NOT gate 53. The output end of the AVC function soft pressure plate 30 is respectively connected to the input end of the first AND gate 51 and the input end of the second AND gate 52. The output end of the fast voltage regulation soft pressure plate 40 is respectively connected to the input end of the NOT gate 53 and the input end of the second AND gate 52. The output end of the NOT gate 53 is connected to the input end of the first AND gate 51. The output end of the first AND gate 51 is connected to the input end of the AVC voltage control function module 10. The output end of the second AND gate 52 is connected to the input end of the fast voltage control function module 20. By performing logical operations on the output signals of the AVC function soft pressure plate 30 and the fast voltage regulation soft pressure plate 40, it is possible to select one of the AVC voltage control function module 10 and the fast voltage control function module 20 to operate when the wind farm fast voltage control device is working. The AVC voltage control function module 10 and the fast voltage control function module 20 cannot operate at the same time. The throw-in / out logic function table of the soft pressure plate throw-in / out module 50 is shown in Table 1. When the AVC function soft pressure plate 30 is put into operation and the fast voltage regulation soft pressure plate 40 is withdrawn, the AVC voltage control function module 10 is operated; when the AVC function soft pressure plate 30 is put into operation and the fast voltage regulation soft pressure plate 40 is put into operation, the fast voltage control function module 20 is operated; when the AVC function soft pressure plate 30 is withdrawn and the fast voltage regulation soft pressure plate 40 is put into operation or withdrawn, the device does not perform voltage control.

[0042] Table 1 Logic function table of soft pressure plate throwing and throwing module 50

[0043] AVC function soft pressure plate Soft pressure plate with quick pressure adjustment function Executive Function 0 0 / 1 quit 1 0 General AVC features 1 1 Fast voltage control function

[0044] like Figure 2As shown, the wind farm rapid voltage control device of the present invention is deployed at the reactive power device layer. The entire hardware deployment structure includes an AVC dispatching master station, a wind farm rapid voltage control device, and a reactive compensation device. The AVC dispatching master station calculates according to the planned curve and the voltage, current and other information fed back by the substation, and sends its control strategy to the substation according to the reactive power distribution algorithm to control the reactive compensation device to dispatch and distribute reactive power. The wind farm rapid voltage control device has both the conventional AVC substation function and the rapid voltage control function, and an independent functional soft pressure plate is set to switch the rapid voltage control module. The reactive compensation device includes N wind turbines and M SVGs. Reactive power compensation is provided by both the wind farm double-fed asynchronous generator and the SVG. The wind turbine generator is preferentially used for capacitive reactive output, and the shortfall of the total reactive adjustment is compensated by the SVG. This arrangement reduces the number of SVGs required for system reactive compensation, and the adjustment of reactive voltage has high flexibility.

[0045] Example 2

[0046] like Figure 3 As shown, based on a wind farm rapid voltage control device provided in Example 1, this embodiment provides a wind farm rapid voltage control method, including the following steps:

[0047] Step 1: Control the output signals of the AVC function soft pressure plate 30 and the fast voltage regulation soft pressure plate 40, and run the AVC voltage control function module 10 or the fast voltage control function module 20. When the fast voltage control function module 20 is run, the bus voltage is monitored in real time and the measured value of the bus voltage U0 is obtained, and the target voltage value U0 is calculated. t The voltage difference dU with the measured value of bus voltage U0, dU = U t -U0.

[0048] In step 1, when the AVC function soft pressure plate 30 is put into operation and the fast voltage regulation soft pressure plate 40 is withdrawn, the AVC voltage control function module 10 is run; when the AVC function soft pressure plate 30 is put into operation and the fast voltage regulation soft pressure plate 40 is put into operation, the fast voltage control function module 20 is run.

[0049] Step 2: Determine whether the voltage difference dU exceeds the voltage control dead zone. If yes, go to step 3; if no, go back to step 1.

[0050] Step 3: Determine whether the measured bus voltage value U0 is within the range of the high lockout threshold and the low lockout threshold. If so, proceed to step 4; if not, enter the lockout state.

[0051] After entering the blocking state in step 3, continue to determine whether to release the blocking state. If so, return to step 1 to determine whether the voltage difference dU exceeds the voltage control dead zone. If not, maintain the blocking state.

[0052] Step 4: Calculate the reactive power regulation dQ, and constrain the single voltage regulation and single reactive power regulation. Based on the reactive power regulation dQ, calculate the total reactive power remote regulation instruction Q. t The reactive power to be compensated is calculated by the reactive power distribution strategy and algorithm module 60 and outputted through the remote control output port 70 .

[0053] Reactive power remote control total command Q t The calculation formula is:

[0054] Q t =Q0+dQ

[0055] dQ=dU×X

[0056] Among them, Q0 is the initial reactive power command value, dU is the single voltage regulation value, and X is the system reactance value.

[0057] After executing one cycle, the system waits for the next regulation cycle and re-executes the fast voltage control process from step 1.

[0058] The fast voltage control device of the present invention is subject to a single adjustment not exceeding the AVC single voltage adjustment amount (0.1kV) and the AVC single maximum reactive adjustment amount (1.0Mvar), and both constraints are valid. After the constraint, the single reactive adjustment amount = min{AVC single voltage adjustment amount × voltage adjustment coefficient; AVC single maximum reactive adjustment amount}.

[0059] In step 4, the reactive power distribution strategy and algorithm module 60 is based on the reactive power remote adjustment total instruction Q t The reactive power distribution strategy implemented includes two cases:

[0060] The first case is: when the target voltage value U t If the current output of SVG is positive, it means that SVG is in capacitive output, and the fan output should be increased first. If the current output of SVG is negative, the SVG output should be increased, and the inductive output of SVG should be released first. If the inductive output of SVG is insufficient, the fan output should be increased.

[0061] The second case is: when the target voltage value U t If the SVG is currently positive, the SVG output is reduced, and the SVG capacitive output is released first. If it is insufficient after release, the fan output is reduced. If the SVG is currently negative, it means that the SVG is already in the inductive output, and the fan output is reduced first.

[0062] The reactive power allocation algorithm adopted by the reactive power allocation strategy and algorithm module 60 inherits the existing AVC allocation algorithm, such as equal margin allocation, equal output allocation, equal power factor allocation, etc.

[0063] The wind farm rapid voltage control device of the present invention adds a rapid voltage control function module 20 on the basis of the conventional AVC voltage control function module 10, and switches and selects one of the control modes of the AVC voltage control function module 10 and the rapid voltage control function module 20 through the AVC function soft pressure plate 30 and the rapid voltage regulation soft pressure plate 40. When switched to the rapid voltage control mode, the voltage is rapidly and steadily adjusted to the target value by setting the voltage regulation step size, using a small regulation voltage and a short regulation time, which can suppress voltage fluctuations and has a faster reactive power response speed.

[0064] Case Study

[0065] Figure 4 This is the conventional AVC voltage regulation action of the wind farm. The current bus voltage value is 220.0kV, the set target voltage value is 221.0kV, and the lift voltage value is 1kV. It can be seen from the figure that the single regulation cycle of conventional AVC control is 20s, and the single regulation voltage value is 0.5kV. Due to the slow reactive response and certain lag, the entire regulation process takes about 30-40s.

[0066] Figure 5 This is the fast AVC voltage regulation action of the wind farm. The current bus voltage value is 220.0kV, the set target voltage value is 221.0kV, and the lift voltage value is 1kV. It can be seen from the figure that the single adjustment cycle of the fast AVC control is 0.5s, the single adjustment voltage value is 1kV, and the whole adjustment process takes about 1s.

[0067] Figure 6 This is the action process of the fast voltage control of the wind farm of the present invention. The current bus voltage value is 220.0kV, the target voltage value is set to 221.0kV, and the lifting voltage value is 1kV. It can be seen from the figure that the single adjustment cycle of the fast voltage control is 0.5s, the single adjustment voltage value is 0.1kV, the whole adjustment process takes about 5s, and the voltage curve rises steadily and quickly to the target value within 5s.

[0068] Instantaneous voltage fluctuation is a normal operation of the grid voltage and will soon return to the standard range. If the device is not restricted, it will cause frequent operation of the device, reduce the life of the device and seriously affect the reactive power distribution and voltage quality of the bus voltage. For this reason, the present invention adds a constraint to prevent the device from malfunctioning and sets the voltage limit time. Figure 7As shown in the figure, the bus voltage is stable at 220.0kV. When a voltage fluctuation occurs, the voltage instantly rises to 222.3kV. However, since the voltage over-limit time is 1s, during the voltage over-limit time, even if the bus voltage fluctuation exceeds the voltage control dead zone, the device will not operate. The voltage fluctuation itself returns to the original 220.0kV, effectively preventing the device from erroneous response caused by transient fluctuations in the bus voltage.

[0069] Figure 8 This is the automatic voltage regulation process of the present invention. It can be seen from the figure that at this time, the time when the voltage exceeds the limit exceeds the dead time 1s set by the device. The device starts to act and quickly pulls the voltage value to the range of allowable voltage fluctuations. After returning to the dead zone, it will be further adjusted according to the difference with the dispatching voltage instruction, and then approach the action once more to maintain the bus voltage near the target voltage as much as possible.

[0070] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wind farm rapid voltage control device, characterized in that: The invention comprises an AVC voltage control function module (10), a fast voltage control function module (20), an AVC function soft pressure plate (30), a fast voltage regulation soft pressure plate (40), a soft pressure plate throw-in / out module (50), a reactive power distribution strategy and algorithm module (60), and a remote adjustment output port (70). The target voltage values ​​are respectively input into the AVC voltage control function module (10) and the fast voltage control function module (20). The output signals of the AVC function soft pressure plate (30) and the fast voltage regulation soft pressure plate (40) are respectively input into the soft pressure plate throw-in / out module (50) for logic combination operation. The output signals of the board insertion and withdrawal module (50) are respectively input into the AVC function soft pressure plate (30) and the fast voltage regulation soft pressure plate (40), and the AVC voltage control function module (10) or the fast voltage control function module (20) is selected to run. When the AVC voltage control function module (10) or the fast voltage control function module (20) is running, the total reactive power remote adjustment instruction is calculated and sent to the reactive power distribution strategy and algorithm module (60). The reactive power size to be compensated is calculated by the reactive power distribution strategy and algorithm module (60) and outputted through the remote adjustment output port (70).

2. The wind farm rapid voltage control device according to claim 1, characterized in that: The target voltage value is obtained by parsing a voltage curve instruction, wherein the voltage curve instruction includes a remote dispatch voltage instruction and a local curve voltage instruction. The parsed target voltage value, fixed value and signal logic are respectively transmitted in parallel to an AVC voltage control function module (10) and a fast voltage control function module (20) through input ports.

3. The wind farm rapid voltage control device according to claim 1, characterized in that: The soft pressure plate throw-in / out module (50) comprises a first AND gate (51), a second AND gate (52), and a NOT gate (53); the output end of the AVC function soft pressure plate (30) is respectively connected to the input end of the first AND gate (51) and the input end of the second AND gate (52); the output end of the fast voltage regulation soft pressure plate (40) is respectively connected to the input end of the NOT gate (53) and the input end of the second AND gate (52); the output end of the NOT gate (53) is connected to the input end of the first AND gate (51); the output end of the first AND gate (51) is connected to the input end of the AVC voltage control function module (10); and the output end of the second AND gate (52) is connected to the input end of the fast voltage control function module (20).

4. A control method for a wind farm rapid voltage control device according to any one of claims 1 to 3, characterized in that: The control method comprises the following steps: Step 1: Control the output signals of the AVC function soft pressure plate (30) and the fast voltage regulation soft pressure plate (40), and run the AVC voltage control function module (10) or the fast voltage control function module (20). When the fast voltage control function module (20) is run, the bus voltage is monitored in real time and the bus voltage actual measured value U0 is obtained, and the target voltage value U is calculated. t The voltage difference dU with the measured value of bus voltage U0, dU = U t -U0; Step 2: Determine whether the voltage difference dU exceeds the voltage control dead zone. If yes, go to step 3; if no, go back to step 1. Step 3: Determine whether the measured value of the bus voltage U0 is within the range of the high lockout threshold and the low lockout threshold. If so, proceed to step 4; if not, enter the lockout state. Step 4: Calculate the reactive power regulation dQ, and constrain the single voltage regulation and single reactive power regulation. Based on the reactive power regulation dQ, calculate the total reactive power remote regulation instruction Q. t The reactive power required to be compensated is calculated by the reactive power distribution strategy and algorithm module (60) and outputted through the remote control output port (70).

5. The method for rapid voltage control in a wind farm according to claim 4, characterized in that: In the step 1, when the AVC function soft pressure plate (30) is put into operation and the fast voltage regulation soft pressure plate (40) is withdrawn, the AVC voltage control function module (10) is operated; when the AVC function soft pressure plate (30) is put into operation and the fast voltage regulation soft pressure plate (40) is put into operation, the fast voltage control function module (20) is operated.

6. The method for rapid voltage control in a wind farm according to claim 4, characterized in that: After entering the locking state in step 3, it is continued to determine whether to release the locking. If so, it returns to step 1 to determine whether the voltage difference dU exceeds the voltage control dead zone. If not, the locking state is maintained.

7. The method for rapid voltage control in a wind farm according to claim 4, characterized in that: Reactive power remote control total command Q t The calculation formula is: Q t =Q0+dQ dQ=dU×X Among them, Q0 is the initial reactive power command value, dU is the single voltage regulation value, and X is the system reactance value.

8. The method for rapid voltage control in a wind farm according to claim 4, characterized in that: In step 4, the single reactive power adjustment amount=min{AVC single voltage adjustment amount×voltage adjustment coefficient; AVC single maximum reactive power adjustment amount}.

9. The wind farm rapid voltage control method according to claim 4, characterized in that: In step 4, the reactive power distribution strategy and algorithm module (60) is based on the reactive power remote adjustment total instruction Q t The reactive power distribution strategy implemented includes two cases: The first case is: when the target voltage value U t If the current output of SVG is positive, the fan output is increased; if the current output of SVG is negative, the SVG output is increased; The second case is: when the target voltage value U t If the SVG is currently positive, the SVG output is reduced; if the SVG is currently negative, the fan output is reduced.

10. The method for rapid voltage control in a wind farm according to claim 4, characterized in that: The reactive power distribution algorithm adopted by the reactive power distribution strategy and algorithm module (60) in step 4 is equal margin distribution, equal output distribution or equal power factor distribution.

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