Control method for active and reactive power regulation of a wind farm and related components

Abstract

The application discloses a kind of wind farm active regulation and reactive regulation control method, device, equipment and medium, it is related to wind farm power regulation technical field, including: the frequency deviation and voltage of grid-connected point monitored in the operation process of wind farm are obtained;The frequency deviation and voltage of grid-connected point are dead zone detection to determine whether the frequency deviation and voltage of grid-connected point are respectively within the first frequency deviation dead zone range of frequency deviation hysteresis dead zone specification and within the first voltage dead zone range of voltage hysteresis dead zone specification;If none is in, then using active frequency control method to carry out active regulation to grid-connected point frequency, using reactive voltage control method to carry out reactive regulation to grid-connected point voltage, until the frequency deviation and voltage are respectively within the second frequency deviation dead zone range of frequency deviation hysteresis dead zone specification and within the second voltage dead zone range of voltage hysteresis dead zone specification.By setting hysteresis dead zone, the frequent switching of active and reactive regulation near dead zone critical value is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind farm power regulation, in particular to a wind farm active and reactive power regulation control method and related components thereof. BACKGROUND

[0002] Developing wind power is to build a clean, low-carbon, safe and efficient energy system in China. Wind power has characteristics such as weak inertia, low disturbance resistance, weak damping, and weak frequency / voltage support. With the increasing scale of wind power connected to the grid, the safety and stability of the power system are becoming more and more severe.

[0003] Through the efforts of wind power practitioners in recent years, wind turbine active participation in power system frequency / voltage regulation has made breakthrough progress and achieved industrialization promotion. GB / T 19963.1-2021 "Technical Regulations for Connecting Wind Farms to Power Systems Part 1: Land-based Wind Power" has also clearly proposed that wind farms must have inertia response, primary frequency regulation, and reactive voltage regulation active support functions.

[0004] In wind farm active and reactive power regulation, frequency dead zone, voltage dead zone, and power factor dead zone need to be detected. In actual application, a single dead zone setting is generally used for entering and exiting the dead zone, that is, the same dead zone detection is used for frequency, voltage, and power factor entering and exiting the dead zone. This will cause the active and reactive power regulation to frequently start and stop near the dead zone critical value, and further cause the grid-connected point power oscillation due to the frequent start and stop of the frequency regulation additional active power or voltage regulation additional reactive power, affecting the safe and stable operation of the power system.

[0005] In summary, how to avoid the frequent start and stop of active and reactive power regulation near the dead zone critical value to achieve the safe and stable operation of the power system is a problem to be solved at present. SUMMARY

[0006] Therefore, the purpose of the present application is to provide a wind farm active and reactive power regulation control method, device, equipment and medium, which can avoid the frequent start and stop of active and reactive power regulation near the dead zone critical value to achieve the safe and stable operation of the power system. The specific scheme is as follows:

[0007] In the first aspect, the present application discloses a wind farm active and reactive power regulation control method, comprising:

[0008] acquiring the current monitored grid-connected point frequency deviation and grid-connected point voltage during the operation of the wind farm;

[0009] performing dead zone detection on the grid-connected point frequency deviation and the grid-connected point voltage to determine whether the grid-connected point frequency deviation is within a first frequency deviation dead zone range defined by a frequency deviation hysteresis dead zone and whether the grid-connected point voltage is within a first voltage dead zone range defined by a voltage hysteresis dead zone;

[0010] if the grid-connected point frequency deviation is not within the first frequency deviation dead zone range, performing active regulation on the grid-connected point frequency by using an active frequency control method until the grid-connected point frequency deviation is within a second frequency deviation dead zone range defined by the frequency deviation hysteresis dead zone;

[0011] if the grid-connected point voltage is not within the first voltage dead zone range, performing reactive regulation on the grid-connected point voltage by using a reactive voltage control method until the grid-connected point voltage is within a second voltage dead zone range defined by the voltage hysteresis dead zone.

[0012] Optionally, the control method for active and reactive regulation of the wind farm further comprises:

[0013] if the grid-connected point voltage is within the first voltage dead zone range, obtaining a currently detected grid-connected point power factor and performing dead zone detection on the grid-connected point power factor to determine whether the grid-connected point power factor is within a first power factor dead zone range defined by a power factor hysteresis dead zone;

[0014] if the grid-connected point power factor is not within the first power factor dead zone range, performing reactive regulation on the grid-connected point power factor by using a reactive power factor control method until the grid-connected point power factor is within a second power factor dead zone range defined by the power factor hysteresis dead zone.

[0015] Optionally, the performing active regulation on the grid-connected point frequency by using the active frequency control method comprises:

[0016] determining whether a grid-connected point active power meets a preset active regulation power threshold condition;

[0017] if yes, calculating an inertia response additional power and a primary frequency modulation additional power and determining an active power reference value based on the grid-connected point active power, the inertia response additional power, the primary frequency modulation additional power and a wind farm active loss;

[0018] issuing an active control instruction based on the active power reference value so as to regulate the grid-connected point frequency by using the active control instruction.

[0019] Optionally, after obtaining the currently monitored grid-connected point frequency deviation and grid-connected point voltage during the operation of the wind farm, the method further comprises:

[0020] determining whether the wind farm is in a voltage ride-through mode based on the grid-connected point voltage;

[0021] if the wind farm is not in the voltage ride-through mode, performing the step of performing the dead zone detection on the grid-connected point frequency deviation and the grid-connected point voltage;

[0022] if the wind farm is in the voltage ride-through mode, performing voltage ride-through control by the wind farm.

[0023] Optionally, the reactive power voltage control method for reactive power regulation of the grid-connected point voltage comprises:

[0024] determining a plurality of voltage intervals formed by preset voltage reference values, and determining a reactive power voltage control mode corresponding to each of the voltage intervals;

[0025] determining a target voltage interval in which the grid-connected point voltage is located, and performing voltage regulation of the grid-connected point by using the reactive power voltage control mode corresponding to the target voltage interval.

[0026] Optionally, the determining a plurality of voltage intervals formed by preset voltage reference values, and determining a reactive power voltage control mode corresponding to each of the voltage intervals comprises:

[0027] constructing a first voltage interval based on a voltage ride-through threshold value and a preset specified parameter threshold value, and determining the reactive power voltage control mode of the first voltage interval as a constant reactive power control mode;

[0028] constructing a second voltage interval based on the preset specified parameter threshold value and a voltage droop adjustment parameter threshold value, and determining the reactive power voltage control mode of the second voltage interval as a voltage droop control mode;

[0029] constructing a third voltage interval based on the voltage droop parameter threshold value and a boundary reference value corresponding to the second voltage dead zone range, and determining the reactive power voltage control mode of the third voltage interval as a constant voltage control mode.

[0030] Optionally, the performing voltage regulation of the grid-connected point by using the reactive power voltage control mode corresponding to the target voltage interval comprises:

[0031] if the target voltage interval is the first voltage interval, determining a reactive power reference value based on wind farm reactive power loss and a maximum value of grid-connected point reactive power;

[0032] if the target voltage interval is the second voltage interval, determining a reactive power reference value based on wind farm reactive power loss, a preset voltage droop coefficient, the voltage droop adjustment parameter threshold value, wind farm rated power, and a voltage filtered value obtained by filtering the grid-connected point voltage;

[0033] If the target voltage interval is the third voltage interval, a reactive power reference value is determined based on a wind farm reactive loss, a preset proportional integral gain, a wind farm voltage reference value, and the voltage filter value;

[0034] A reactive control instruction is issued based on the reactive power reference value, so as to adjust the voltage of the grid-connected point by using the reactive control instruction.

[0035] In a second aspect, the present application discloses a wind farm active and reactive regulation control device, comprising:

[0036] An information monitoring module is configured to acquire a current monitored grid-connected point frequency deviation and a grid-connected point voltage during wind farm operation.

[0037] A dead zone detection module is configured to perform dead zone detection on the grid-connected point frequency deviation and the grid-connected point voltage, so as to determine whether the grid-connected point frequency deviation is within a first frequency deviation dead zone range defined by a frequency deviation hysteresis dead zone, and determine whether the grid-connected point voltage is within a first voltage dead zone range defined by a voltage hysteresis dead zone.

[0038] An active regulation module is configured to perform active regulation on the grid-connected point frequency by using an active frequency control method if the grid-connected point frequency deviation is not within the first frequency deviation dead zone range, until the grid-connected point frequency deviation is within a second frequency deviation dead zone range defined by the frequency deviation hysteresis dead zone.

[0039] A reactive regulation module is configured to perform reactive regulation on the grid-connected point voltage by using a reactive voltage control method if the grid-connected point voltage is not within the first voltage dead zone range, until the grid-connected point voltage is within a second voltage dead zone range defined by the voltage hysteresis dead zone.

[0040] In a third aspect, the present application discloses an electronic device, comprising:

[0041] A memory is configured to save a computer program.

[0042] A processor is configured to execute the computer program to implement the steps of the wind farm active and reactive regulation control method disclosed above.

[0043] In a fourth aspect, the present application discloses a computer readable storage medium configured to store a computer program; wherein the computer program is executed by a processor to implement the steps of the wind farm active and reactive regulation control method disclosed above.

[0044] It can be seen that the application obtains the current monitored grid-connected point frequency deviation and grid-connected point voltage in the operation process of the wind farm; the grid-connected point frequency deviation and the grid-connected point voltage are subjected to out-of-dead-zone detection to determine whether the grid-connected point frequency deviation is within a first frequency deviation dead-zone range specified by a frequency deviation hysteresis dead zone and whether the grid-connected point voltage is within a first voltage dead-zone range specified by a voltage hysteresis dead zone; if the grid-connected point frequency deviation is not within the first frequency deviation dead-zone range, the grid-connected point frequency is subjected to active regulation by using an active frequency control method until the grid-connected point frequency deviation is within a second frequency deviation dead-zone range specified by the frequency deviation hysteresis dead zone; if the grid-connected point voltage is not within the first voltage dead-zone range, the grid-connected point voltage is subjected to reactive regulation by using a reactive voltage control method until the grid-connected point voltage is within a second voltage dead-zone range specified by the voltage hysteresis dead zone. It can be seen that the application introduces the concept of hysteresis dead zone in active regulation and reactive regulation, that is, the corresponding hysteresis dead zone is used to detect the monitored grid-connected point frequency deviation and grid-connected point voltage out of the dead zone to determine whether the grid-connected point frequency deviation is within a first frequency deviation dead-zone range specified by a frequency deviation hysteresis dead zone and whether the grid-connected point voltage is within a first voltage dead-zone range specified by a voltage hysteresis dead zone, if not, the grid-connected point frequency is subjected to active regulation by using an active frequency control method, and the grid-connected point voltage is subjected to reactive regulation by using a reactive voltage control method, until the frequency deviation and the voltage are within a second frequency deviation dead-zone range specified by the frequency deviation hysteresis dead zone and a second voltage dead-zone range specified by the voltage hysteresis dead zone, respectively. Through the above scheme, the problem of grid-connected point power oscillation caused by the frequent switching of frequency regulation additional active or voltage regulation additional reactive due to the frequent switching of active regulation and reactive regulation near the critical value of the single dead zone can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0046] Figure 1 A wind farm active regulation and reactive regulation control method flow chart disclosed by the present application;

[0047] Figure 2 A specific wind farm active regulation and reactive regulation control method flow chart disclosed by the present application;

[0048] Figure 3A specific wind farm reactive power factor control method flow chart disclosed in the present application;

[0049] Figure 4 A specific wind farm active regulation and reactive regulation control method flow chart disclosed in the present application;

[0050] Figure 5 A specific wind farm active frequency control method flow chart disclosed in the present application;

[0051] Figure 6 A specific wind farm active regulation block diagram disclosed in the present application;

[0052] Figure 7 A specific wind farm active regulation and reactive regulation control method flow chart disclosed in the present application;

[0053] Figure 8 A specific wind farm reactive voltage control method flow chart disclosed in the present application;

[0054] Figure 9 A specific wind farm reactive regulation block diagram disclosed in the present application;

[0055] Figure 10 A specific wind farm active regulation and reactive regulation control device structure schematic diagram disclosed in the present application;

[0056] Figure 11 An electronic equipment structure diagram disclosed in the present application. DETAILED DESCRIPTION

[0057] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0058] Currently, a single dead zone setting is generally used in wind farm active regulation and reactive regulation, that is, the same dead zone detection is used for frequency, voltage and power factor into and out of the dead zone. This will cause the active regulation and reactive regulation to frequently start and stop near the dead zone critical value, and further cause the grid-connected point power oscillation due to the frequent start and stop of the frequency regulation additional active or voltage regulation additional reactive, which affects the safe and stable operation of the power system. Therefore, the embodiments of the present application disclose a wind farm active regulation and reactive regulation control method, device, equipment and medium, which can avoid the frequent start and stop of the active regulation and reactive regulation near the dead zone critical value to realize the safe and stable operation of the power system.

[0059] Reference is made to Figure 1and Figure 2 As shown in the accompanying drawings, the embodiments of the present application disclose a control method for active regulation and reactive regulation of a wind farm, which comprises the following steps:

[0060] Step S11: obtaining a current monitored grid-connected point frequency deviation and a grid-connected point voltage during operation of the wind farm.

[0061] In the embodiments, when the wind farm is in normal operation, a current real-time monitored grid-connected point frequency deviation and a grid-connected point voltage are obtained. Further, after the above step of obtaining the current monitored grid-connected point frequency deviation and the grid-connected point voltage during operation of the wind farm, the method further comprises: judging whether the wind farm is in a voltage ride-through mode based on the grid-connected point voltage; if the wind farm is not in the voltage ride-through mode, performing the step of performing out-of-hysteresis detection on the grid-connected point frequency deviation and the grid-connected point voltage; and if the wind farm is in the voltage ride-through mode, performing voltage ride-through control through the wind farm. It can be understood that, after the grid-connected point voltage V t is obtained, first, it is judged whether the wind farm is in the voltage ride-through mode according to the grid-connected point voltage V t , specifically, the grid-connected point voltage is compared with voltage ride-through thresholds V dip and V up , wherein V dip is a low voltage ride-through threshold, and V up is a high voltage ride-through threshold. If V dip ≤ V t ≤ V up , it indicates that the wind farm is not in the voltage ride-through mode, and then the out-of-hysteresis detection is performed on the grid-connected point frequency deviation and the grid-connected point voltage; if V t > V up or V t < V dip , it indicates that the wind farm is in the voltage ride-through mode, and then the voltage ride-through control is autonomously completed through the wind farm unit.

[0062] Step S12: performing out-of-hysteresis detection on the grid-connected point frequency deviation and the grid-connected point voltage to determine whether the grid-connected point frequency deviation is in a first frequency deviation hysteresis dead zone range defined by a frequency deviation hysteresis dead zone, and to determine whether the grid-connected point voltage is in a first voltage hysteresis dead zone range defined by a voltage hysteresis dead zone.

[0063] In the present embodiment, the concept of hysteresis dead zone is introduced in active regulation and reactive regulation, that is, the grid-connected point frequency deviation and the grid-connected point voltage are out of dead zone detection by using corresponding hysteresis dead zone to determine whether the grid-connected point frequency deviation is in the first frequency deviation dead zone range specified by the frequency deviation hysteresis dead zone, and whether the grid-connected point voltage is in the first voltage dead zone range specified by the voltage hysteresis dead zone. It can be understood that when the grid-connected point frequency, voltage and power factor of the wind farm are monitored, the active regulation and reactive regulation will be caused by the dead zone detection after the monitoring quantity is in the dead zone, but the same dead zone detection is generally used for the monitoring quantity in and out of the dead zone, which leads to the frequent switching of the control function near the dead zone critical value. Therefore, the hysteresis dead zone is set to avoid the above problems. The setting mode of the hysteresis dead zone is as follows:

[0064]

[0065] When the monitoring quantity D satisfies D < db i1 or D > db i2 , the active regulation and reactive regulation of the wind farm are put into operation to regulate the grid-connected point frequency, voltage and power factor, etc. When the monitoring quantity D satisfies db o1 ≤ D ≤ db o2 , the active regulation / reactive regulation of the wind farm is exited, indicating that the grid-connected point voltage, frequency and power factor, etc. have been regulated in place. Generally, the above dead zone critical value satisfies db i1 < db o1 < db o2 < db i2 .

[0066] Therefore, when the grid-connected point frequency deviation Δf and the grid-connected point voltage V t are out of dead zone detection, for the grid-connected point frequency deviation Δf, if Δf i1 ≤ Δf ≤ Δf i2 , it indicates that the grid-connected point frequency deviation is not out of the dead zone, that is, it is in the first frequency deviation dead zone range specified by the frequency deviation hysteresis dead zone, otherwise, if Δf < Δf i1 or Δf > Δf i2 , it indicates that the grid-connected point frequency deviation is out of the dead zone, that is, it is not in the first frequency deviation dead zone range specified by the frequency deviation hysteresis dead zone. For the grid-connected point voltage V t , if V ti1 ≤ V t ≤ V ti2 , it indicates that the grid-connected point voltage is not out of the dead zone, that is, it is in the first voltage dead zone range specified by the voltage hysteresis dead zone, otherwise, if V t < V ti1 or V t > V ti2, it indicates that the grid-connected point voltage has gone out of the dead zone, i.e. is not within the first voltage dead zone range defined by the voltage hysteresis dead zone.

[0067] Step S13: If the grid-connected point frequency deviation is not within the first frequency deviation dead zone range, the active frequency control method is used to actively adjust the grid-connected point frequency until the grid-connected point frequency deviation is within the second frequency deviation dead zone range defined by the frequency deviation hysteresis dead zone.

[0068] In one specific embodiment, if the grid-connected point frequency deviation is not within the first frequency deviation dead zone range, i.e. Δf i1 or Δf > Δf i2 , the active frequency control method is used to actively adjust the grid-connected point frequency until the grid-connected point frequency deviation is within the second frequency deviation dead zone range defined by the frequency deviation hysteresis dead zone, i.e. needs to satisfy Δf o1 ≤ Δf ≤ Δf o2 . Wherein Δf i1 < Δf o1 < Δf o2 < Δf i2 .

[0069] In another specific embodiment, if the grid-connected point frequency deviation is within the first frequency deviation dead zone range, i.e. Δf i1 ≤ Δf ≤ Δf i2 , it indicates that the grid-connected point frequency deviation is within the normal active control range, and the frequency deviation does not need to be adjusted.

[0070] Step S14: If the grid-connected point voltage is not within the first voltage dead zone range, the reactive voltage control method is used to adjust the grid-connected point voltage until the grid-connected point voltage is within the second voltage dead zone range defined by the voltage hysteresis dead zone.

[0071] In one specific embodiment, if the grid-connected point voltage is not within the first voltage dead zone range, i.e. V t < V ti1 or V t > V ti2 , the reactive voltage control method is used to adjust the grid-connected point voltage until the grid-connected point voltage is within the second voltage dead zone range defined by the voltage hysteresis dead zone, i.e. needs to satisfy V to1 ≤ V t ≤ V to2 . Wherein V ti1 < V to1 < V to2＜ V ti2 .

[0072] In another specific implementation, after determining whether the grid connection point voltage is within the first voltage dead zone range defined by the voltage hysteresis dead zone, the method further includes: if the grid connection point voltage is within the first voltage dead zone range, obtaining the currently detected grid connection point power factor and performing dead zone detection on the grid connection point power factor to determine whether the grid connection point power factor is within the first power factor dead zone range defined by the power factor hysteresis dead zone; if the grid connection point power factor is not within the first power factor dead zone range, using a reactive power factor control method to adjust the grid connection point power factor until the grid connection point power factor is within the second power factor dead zone range defined by the power factor hysteresis dead zone. That is, if the grid connection point voltage is within the first voltage dead zone range, the reactive power control mode of the wind farm is selected as reactive power factor control. First, the power factor (PF) at the grid connection point needs to be obtained during the normal operation of the wind farm. Then, dead zone detection is performed on the power factor at the grid connection point to determine whether the power factor at the grid connection point is within the first power factor dead zone range specified by the power factor hysteresis dead zone, that is, whether the PF requirement is met. i1 ≤PF≤PF i2 If the condition is met, it means the power factor is within the dead zone and no adjustment is needed; if PF < PF i1 Or PF > PF i2 If the power factor at the grid connection point is outside the dead zone, meaning it is not within the first power factor dead zone specified by the power factor hysteresis dead zone, then reactive power factor control methods are needed to adjust the power factor at the grid connection point until it falls within the second power factor dead zone specified by the power factor hysteresis dead zone, i.e., the power factor (PF) must be satisfied. o1 ≤PF≤PF o2 , where PF i1 <PF o1 <PF o2 <PF i2 .

[0073] For details, see Figure 3 As shown, if the power factor at the grid connection point is outside the dead zone, that is, if the power factor does not meet the PF requirement... i1 ≤PF≤PF i2 Then, the reactive power factor control method needs to be used to adjust the power factor at the grid connection point. First, the reactive power reference value needs to be determined, specifically: Q ref =P t ×tan(PF ref )+Q CMP Q ref P is the reference value for reactive power in a wind farm. t For the active power at the grid connection point, PF ref Q is the power factor angle reference value. CMPfor the reactive power loss of the wind turbine to the grid point. Then, based on the reactive power reference value, a reactive power control instruction is issued to adjust the power factor of the grid point, and the power factor of the grid point is detected in a dead zone until PF o1 ≤ PF ≤ PF o2 , indicating that the wind farm constant power factor control has achieved the desired effect, and the power factor of the grid point is continuously monitored. If after one adjustment, the power factor of the grid point still does not satisfy PF o1 ≤ PF ≤ PF o2 , the reactive power control instruction is continuously issued based on the reactive power reference value to adjust the power factor of the grid point.

[0074] That is, through the above scheme, the wind farm reactive power control mode can be selected according to the grid point voltage and the characteristics of different reactive power control modes, specifically: if the grid point voltage is within the first voltage dead zone range specified by the voltage hysteresis dead zone, the reactive power factor control method is selected to control the power factor of the grid point; if the grid point voltage is outside the first voltage dead zone range specified by the voltage hysteresis dead zone, the reactive voltage control method is selected to adjust the voltage of the grid point, so as to optimize the wind power grid characteristics and improve the voltage stability. That is, the appropriate reactive power regulation mode is adaptively selected according to the actual grid point voltage, so as to maximize the utilization of the reactive power regulation capability of the wind farm.

[0075] It can be seen that, in the wind farm operation process, the current monitored grid-connected point frequency deviation and grid-connected point voltage are obtained; the grid-connected point frequency deviation and the grid-connected point voltage are subjected to out-of-hysteresis detection to determine whether the grid-connected point frequency deviation is within a first frequency deviation dead zone range specified by a frequency deviation hysteresis dead zone and whether the grid-connected point voltage is within a first voltage dead zone range specified by a voltage hysteresis dead zone; if the grid-connected point frequency deviation is not within the first frequency deviation dead zone range, active power regulation is performed on the grid-connected point frequency by using an active frequency control method until the grid-connected point frequency deviation is within a second frequency deviation dead zone range specified by the frequency deviation hysteresis dead zone; if the grid-connected point voltage is not within the first voltage dead zone range, reactive power regulation is performed on the grid-connected point voltage by using a reactive voltage control method until the grid-connected point voltage is within a second voltage dead zone range specified by the voltage hysteresis dead zone. It can be seen that, in the active power regulation and the reactive power regulation, the concept of hysteresis dead zone is introduced, that is, the corresponding hysteresis dead zone is used to perform out-of-hysteresis detection on the monitored grid-connected point frequency deviation and grid-connected point voltage to determine whether the grid-connected point frequency deviation is within a first frequency deviation dead zone range specified by a frequency deviation hysteresis dead zone and whether the grid-connected point voltage is within a first voltage dead zone range specified by a voltage hysteresis dead zone, and if both are not within the ranges, active power regulation is performed on the grid-connected point frequency by using an active frequency control method and reactive power regulation is performed on the grid-connected point voltage by using a reactive voltage control method until the frequency deviation is within a second frequency deviation dead zone range specified by the frequency deviation hysteresis dead zone and the voltage is within a second voltage dead zone range specified by the voltage hysteresis dead zone. Through the above scheme, the problem of grid-connected point power oscillation caused by frequent switching of frequency regulation additional active power or voltage regulation additional reactive power due to frequent switching of active power regulation and reactive power regulation near the critical value of a single dead zone can be avoided.

[0076] Referring to Figure 4 and Figure 5 It can be seen that, in the wind farm operation process, the current monitored grid-connected point frequency deviation and grid-connected point voltage are obtained; the grid-connected point frequency deviation and the grid-connected point voltage are subjected to out-of-hysteresis detection to determine whether the grid-connected point frequency deviation is within a first frequency deviation dead zone range specified by a frequency deviation hysteresis dead zone and whether the grid-connected point voltage is within a first voltage dead zone range specified by a voltage hysteresis dead zone; if the grid-connected point frequency deviation is not within the first frequency deviation dead zone range, active power regulation is performed on the grid-connected point frequency by using an active frequency control method until the grid-connected point frequency deviation is within a second frequency deviation dead zone range specified by the frequency deviation hysteresis dead zone; if the grid-connected point voltage is not within the first voltage dead zone range, reactive power regulation is performed on the grid-connected point voltage by using a reactive voltage control method until the grid-connected point voltage is within a second voltage dead zone range specified by the voltage hysteresis dead zone. It can be seen that, in the active power regulation and the reactive power regulation, the concept of hysteresis dead zone is introduced, that is, the corresponding hysteresis dead zone is used to perform out-of-hysteresis detection on the monitored grid-connected point frequency deviation and grid-connected point voltage to determine whether the grid-connected point frequency deviation is within a first frequency deviation dead zone range specified by a frequency deviation hysteresis dead zone and whether the grid-connected point voltage is within a first voltage dead zone range specified by a voltage hysteresis dead zone, and if both are not within the ranges, active power regulation is performed on the grid-connected point frequency by using an active frequency control method and reactive power regulation is performed on the grid-connected point voltage by using a reactive voltage control method until the frequency deviation is within a second frequency deviation dead zone range specified by the frequency deviation hysteresis dead zone and the voltage is within a second voltage dead zone range specified by the voltage hysteresis dead zone. Through the above scheme, the problem of grid-connected point power oscillation caused by frequent switching of frequency regulation additional active power or voltage regulation additional reactive power due to frequent switching of active power regulation and reactive power regulation near the critical value of a single dead zone can be avoided.

[0077] Step S21: In the wind farm operation process, the current monitored grid-connected point frequency deviation and grid-connected point voltage are obtained.

[0078] Step S22: The grid-connected point frequency deviation and the grid-connected point voltage are subjected to out-of-hysteresis detection to determine whether the grid-connected point frequency deviation is within a first frequency deviation dead zone range specified by a frequency deviation hysteresis dead zone and whether the grid-connected point voltage is within a first voltage dead zone range specified by a voltage hysteresis dead zone.

[0079] Step S23: If the grid-connected point frequency deviation is not within the first frequency deviation dead zone range, it is determined whether the grid-connected point active power meets a preset active regulation power threshold condition.

[0080] In this embodiment, if the grid-connected point frequency deviation is not within the first frequency deviation dead zone range, i.e., Δf < Δf i1 or Δf > Δf i2 , it is further determined whether the grid-connected point active power meets a preset active regulation power threshold condition. The grid-connected point active power is denoted as P t , and the wind farm rated power is denoted as P n . The active regulation power threshold condition specifically requires determining whether P t is greater than 20% P n . If P t ≥ 20% P n , it indicates that the wind farm meets the active power regulation threshold condition, i.e., meets the active power regulation requirement.

[0081] Step S24: If the condition is met, the inertia response additional power and the primary frequency modulation additional power are calculated, and the active power reference value is determined based on the grid-connected point active power, the inertia response additional power, the primary frequency modulation additional power, and the wind farm active loss.

[0082] In this embodiment, if the active regulation power threshold condition is met, the inertia response additional power and the primary frequency modulation additional power are calculated, specifically as follows:

[0083] If Δf > 0, the primary frequency modulation additional power ΔP PFR is:

[0084] If Δf < 0, the primary frequency modulation additional power ΔP PFR is:

[0085] If Δf × df / dt > 0, the inertia response additional power ΔP IR is:

[0086] If Δf × df / dt < 0, the inertia response additional power ΔP IR is: ΔP IR = 0;

[0087] Then, the active power reference value P ref is determined based on the grid-connected point active power, the inertia response additional power, the primary frequency modulation additional power, and the wind farm active loss, specifically as follows:

[0088] P ref = P t + ΔP IR+ ΔP PFR + P CMP ;

[0089] wherein, P t is the active power of the grid-connected point, ΔP IR is the inertia response additional power, ΔP PFR is the primary frequency regulation additional power, P CMP is the active power loss of the wind farm, if the active power loss from the wind turbine to the grid-connected point is ignored, P CMP may be set to 0.

[0090] Step S25: issuing an active power control instruction based on the active power reference value, so as to adjust the frequency of the grid-connected point by using the active power control instruction until the frequency deviation of the grid-connected point is within a second frequency deviation dead zone range specified by the frequency deviation hysteresis dead zone.

[0091] In this embodiment, the active power control instruction is issued based on the active power reference value, so as to adjust the frequency of the grid-connected point by using the active power control instruction until the frequency deviation of the grid-connected point satisfies Δf o1 ≤ Δf ≤ Δf o2 , that is, the frequency deviation of the grid-connected point is within the second frequency deviation dead zone range specified by the frequency deviation hysteresis dead zone, which indicates that the wind farm constant power factor control has achieved the expected effect. If the power factor of the grid-connected point still does not satisfy Δf o1 ≤ Δf ≤ Δf o2 after the primary regulation, the active power control instruction is continuously issued based on the active power reference value to adjust the frequency deviation of the grid-connected point of the wind farm. Through the setting of the frequency deviation hysteresis dead zone, the secondary change of the frequency of the grid-connected point of the wind farm caused by the exit of the frequency regulation power can be avoided, and the power oscillation of the grid-connected point caused by the repeated switching of the frequency regulation function of the wind farm can be avoided.

[0092] Figure 6 is a wind farm active regulation block diagram disclosed by the present application, Figure 6 wherein, P t is the active power of the grid-connected point of the wind farm; T p is the active power inertia time constant; df / dt is the frequency change rate of the grid-connected point of the wind farm; f N is the rated frequency; T j is the equivalent inertia time constant of the wind farm; Δf is the frequency deviation of the grid-connected point; K fdn , K fup are the active regulation coefficients; P ref represents the active power reference value of the wind farm; P min , P max are the minimum and maximum values of the active power of the wind farm; P CMP is the active power loss from the wind turbine to the grid-connected point, that is, the active power loss of the wind farm; ΔP IRPower added for inertia response; ΔP PFR Power added for primary frequency regulation; FreqFlag is active regulation flag.

[0093] It should be noted that the active regulation of the wind farm can be divided into four control modes, which are:

[0094] FreqFlag = 0, no additional active regulation mode;

[0095] FreqFlag = 1, inertia response control mode;

[0096] FreqFlag = 2, primary frequency control mode;

[0097] FreqFlag = 3, comprehensive frequency control mode;

[0098] When FreqFlag = 1, the wind farm only has inertia response function, when the inertia response trigger condition is met, the wind farm inertia response additional power is:

[0099]

[0100] The inertia response trigger condition is specifically:

[0101] (1) P t ≥ 20% P n ; P n is the rated power of the wind farm;

[0102] (2) Δf exceeds the frequency dead zone, which can be set to ± (0.03Hz-0.1Hz);

[0103] (3) Δf x df / dt > 0;

[0104] When FreqFlag = 2, the wind farm only has primary frequency regulation function, when the primary frequency trigger condition is met, the wind farm primary frequency additional power is:

[0105]

[0106] The primary frequency trigger condition is specifically:

[0107] (1) P t ≥ 20% P n ;

[0108] (2) Δf exceeds the frequency dead zone, which can be set to ± (0.03Hz-0.1Hz);

[0109] When FreqFlag = 3, the wind farm has comprehensive frequency regulation function, and the wind farm comprehensive frequency regulation additional power is:

[0110] ΔP CO = ΔP IR + ΔP PFR

[0111] In summary, considering the active power loss of the wind turbine to the point of common coupling, the active power reference value of the wind farm can be expressed as:

[0112]

[0113] According to GB / T 19963.1-2021 “Technical Regulation for Wind Farms Accessing Power System Part 1: Land-based Wind Power”, it is stipulated that “wind farms should have the functions of quickly controlling their active power, providing inertia response and primary frequency modulation, and can enable and disable the inertia response and primary frequency modulation functions according to the actual needs of the power system”. The enablement and disablement of the inertia response and primary frequency modulation functions can be realized by setting the FreqFlag. Generally, FreqFlag = 3 is set to realize automatic active regulation of the wind farm.

[0114] Step S26: If the point of common coupling voltage is not in the first voltage dead band range, the reactive voltage control method is used to adjust the reactive power of the point of common coupling voltage until the point of common coupling voltage is in the second voltage dead band range specified by the voltage hysteresis dead band.

[0115] Wherein, the more specific processing process of the above steps S21, S22 and S26 can refer to the corresponding content disclosed in the foregoing embodiments, which will not be repeated here.

[0116] It can be seen that in the embodiments of the present application, if the frequency deviation of the point of common coupling is not in the first frequency deviation dead band range, active regulation of the point of common coupling frequency is required. First, it is necessary to determine whether the active power of the point of common coupling meets the preset active regulation power threshold condition. If it does, the active power reference value is determined based on the active power of the point of common coupling, the inertia response additional power, the primary frequency modulation additional power and the wind farm active power loss, and then the active control instruction is issued to regulate the frequency of the point of common coupling until the frequency deviation of the point of common coupling is in the second frequency deviation dead band range specified by the frequency deviation hysteresis dead band. The setting of the frequency deviation hysteresis dead band can avoid the secondary change of the frequency of the point of common coupling due to the exit of the frequency modulation power, and cause the power oscillation of the point of common coupling caused by the repeated switching of the frequency modulation function of the wind farm.

[0117] Referring to Figure 7 and Figure 8 The embodiments of the present application disclose a specific wind farm active and reactive power regulation control method. Compared with the previous embodiment, the technical solution is further described and optimized. Specifically, it includes:

[0118] Step S31: obtaining the current monitored grid-connected point frequency deviation and grid-connected point voltage during the wind farm operation.

[0119] Step S32: performing dead zone detection on the grid-connected point frequency deviation and the grid-connected point voltage to determine whether the grid-connected point frequency deviation is within a first frequency deviation dead zone range defined by the frequency deviation hysteresis dead zone and whether the grid-connected point voltage is within a first voltage dead zone range defined by the voltage hysteresis dead zone.

[0120] Step S33: if the grid-connected point frequency deviation is not within the first frequency deviation dead zone range, performing active regulation on the grid-connected point frequency by using an active frequency control method until the grid-connected point frequency deviation is within a second frequency deviation dead zone range defined by the frequency deviation hysteresis dead zone.

[0121] Step S34: if the grid-connected point voltage is not within the first voltage dead zone range, determining a plurality of voltage intervals formed by preset voltage reference values and determining a corresponding reactive voltage control mode for each voltage interval.

[0122] In the embodiment, if the grid-connected point voltage is not within the first voltage dead zone range, i.e., V t <V ti1 or V t >V ti2 , a plurality of voltage intervals formed by preset voltage reference values need to be determined and a corresponding reactive voltage control mode for each voltage interval needs to be determined so as to adaptively select different wind farm reactive regulation modes according to different voltage intervals in which the grid-connected point voltage is located.

[0123] Further, the above-mentioned determination of a plurality of voltage intervals formed by preset voltage reference values and the determination of a corresponding reactive voltage control mode for each voltage interval include: constructing a first voltage interval based on a voltage ride-through threshold and a preset specified parameter threshold and determining the reactive voltage control mode of the first voltage interval as a constant reactive control mode; constructing a second voltage interval based on the preset specified parameter threshold and a voltage droop regulation parameter threshold and determining the reactive voltage control mode of the second voltage interval as a voltage droop control mode; constructing a third voltage interval based on the voltage droop parameter threshold and a boundary reference value corresponding to the second voltage dead zone range and determining the reactive voltage control mode of the third voltage interval as a constant voltage control mode. Wherein, the low voltage ride-through threshold is denoted as V dip , the high voltage ride-through threshold is denoted as V up , the preset specified parameter threshold is set to 0.97 and 1.07 respectively, the voltage droop regulation parameter threshold is denoted as V t- and V t+ , and the boundary reference value corresponding to the second voltage dead zone range is Vto1 and V to2 . Then, the first voltage interval is V dip ≤ V t < 0.97 or 1.07 < V t ≤ V up , the reactive power and voltage control mode corresponding to the first voltage interval is determined as the constant reactive power control mode; the second voltage interval is 0.97 ≤ V t < V t- or V t+ < V t ≤ 1.07, the reactive power and voltage control mode corresponding to the second voltage interval is determined as the voltage droop control mode; the third voltage interval is V t- ≤ V t ≤ V to1 or V to2 ≤ V t ≤ V t+ , the reactive power and voltage control mode corresponding to the third voltage interval is determined as the constant voltage control mode.

[0124] It should be noted that the voltage hysteresis dead zone corresponding to the grid-connected point voltage satisfies V ti1 < V to1 < Vto2 < V ti2 , and since the setting of the hysteresis dead zone will cause the reactive power control mode to take the following method for control when the voltage satisfies V ti1 ≤ V t ≤ V to1 and V to2 ≤ V t ≤ V ti2 , specifically: if the grid-connected point voltage is always within the first voltage dead zone range during normal operation, the reactive power control mode of the above two interval sections is the reactive power factor control; if the voltage is not within the first voltage dead zone range during normal operation, and then the grid-connected point voltage is in the above two interval sections after being adjusted by the reactive power and voltage control, the two interval sections take the constant voltage control mode in the reactive power and voltage control mode until the grid-connected point voltage is within the second voltage dead zone range of the voltage hysteresis dead zone and then the reactive power factor control mode is adopted.

[0125] Step S35: determining the target voltage interval in which the grid-connected point voltage is located, and using the reactive power and voltage control mode corresponding to the target voltage interval to adjust the voltage of the grid-connected point until the grid-connected point voltage is within the second voltage dead zone range specified by the voltage hysteresis dead zone.

[0126] In this embodiment, the target voltage interval in which the grid-connected point voltage is located is determined, and the reactive power and voltage control mode corresponding to the target voltage interval is used to adjust the voltage of the grid-connected point until the grid-connected point voltage is within the second voltage dead zone range specified by the voltage hysteresis dead zone, i.e., V to1 ≤ Vt ≤V to2 .

[0127] In the specific embodiment, the above-mentioned voltage regulation of the grid-connected point by using the reactive voltage control mode corresponding to the target voltage interval comprises: if the target voltage interval is the first voltage interval, determining a reactive power reference value based on the wind farm reactive loss and the maximum and minimum values of the grid-connected point reactive power; if the target voltage interval is the second voltage interval, determining a reactive power reference value based on the wind farm reactive loss, the preset voltage droop coefficient, the voltage droop adjustment parameter threshold, the wind farm rated power and the voltage filtered value filtered from the grid-connected point voltage; if the target voltage interval is the third voltage interval, determining a reactive power reference value based on the wind farm reactive loss, the preset proportional integral gain, the wind farm voltage reference value and the voltage filtered value; and issuing a reactive control instruction based on the reactive power reference value so as to regulate the grid-connected point voltage by using the reactive control instruction.

[0128] That is, if the target voltage interval is the first voltage interval, the corresponding reactive voltage control mode is the constant reactive control mode, and then the reactive power reference value is determined based on the wind farm reactive loss and the maximum and minimum values of the grid-connected point reactive power, specifically:

[0129] If V dip ≤V t < 0.97, the reactive power reference value Q ref is: Q ref = Q max + Q CMP .

[0130] If 1.07 < V t ≤V up , the reactive power reference value Q ref is: Q ref = Q min + Q CMP .

[0131] Wherein, Q max and Q min are the maximum and minimum values of the wind farm reactive power, and Q CMP is the wind farm reactive loss, i.e. the reactive loss from the wind turbine to the grid-connected point, and if the wind farm reactive loss is ignored, Q CMP = 0.

[0132] If the target voltage interval is the second voltage interval, the corresponding reactive voltage control mode is the voltage droop control mode, and then the reactive power reference value is determined based on the wind farm reactive loss, the preset voltage droop coefficient, the voltage droop adjustment parameter threshold, the wind farm rated power and the voltage filtered value filtered from the grid-connected point voltage, specifically:

[0133] If 0.97≤V t <V t- , the reactive power reference value Q ref is:

[0134] Q ref =-K uup (V t_filt -V t+ )P n +Q CMP ;

[0135] If V t+ <V t ≤1.07, the reactive power reference value Q ref is:

[0136] Q ref =-K udn (V t_filt -V t- )P n +Q CMP ;

[0137] wherein, K udn , K uup are preset voltage droop coefficients of the wind farm, V t_filt is a voltage filtered value after filtering the grid-connected point voltage, i.e., the voltage of the wind farm grid-connected point voltage filtered through a first-order inertia link, V t- , V t+ are voltage droop adjustment parameter threshold values, i.e., voltage dead zones during voltage droop adjustment, P n is the rated power of the wind farm, and Q CMP is the reactive power loss of the wind farm.

[0138] If the target voltage interval is the third voltage interval, the corresponding reactive voltage control mode is the constant voltage control mode, and the reactive power reference value is determined based on the reactive power loss of the wind farm, the preset proportional integral gain, the voltage reference value of the wind farm and the voltage filtered value, specifically:

[0139] When the grid-connected point voltage satisfies V t- ≤V t ≤V to1 or V to2 ≤V t ≤V t+ , the reactive power reference value Q ref is:

[0140]

[0141] wherein, V err =(V t_filt -Vref ), K pv , K iv is preset proportional integral gain, V t_filt is voltage filter value after filtering grid-connection point voltage, V ref represents wind farm voltage reference value, Q CMP is wind farm reactive power loss, s is differential operator in complex frequency domain.

[0142] Then, reactive power control instruction is issued based on reactive power reference value, so as to adjust voltage of grid-connection point by using reactive power control instruction.

[0143] Figure 9 is a wind farm reactive power regulation block diagram disclosed by the application, Figure 9 , Q set is reactive power set value, which can be value set locally or given by superior dispatch; Q min , Q max is minimum value and maximum value of wind farm reactive power; Q ref is wind farm reactive power reference value. Q CMP is wind farm reactive power loss from wind turbine to grid-connection point; PF ref is power factor angle reference value; V t is wind farm grid-connection point voltage; T v is voltage inertia time constant; V t_filt is voltage after filtering wind farm grid-connection point voltage through first-order inertia link, i.e. voltage filter value; V t- , V t+ is voltage dead zone when voltage droop regulation is performed, K udn , K uup is wind farm voltage droop coefficient, i.e. preset voltage droop coefficient; V ref represents reference voltage, K pv , K iv is preset proportional integral gain; T q is reactive power inertia time constant; P n is wind farm rated power.

[0144] It should be noted that reactive power regulation of wind farm can be divided into four control modes, which are as follows:

[0145] RPCFlag=1, constant reactive power control mode;

[0146] RPCFlag=2, constant power factor control mode;

[0147] RPCFlag=3, voltage droop control mode;

[0148] RPCFlag=4, constant voltage control mode;

[0149] The four modes of reactive power control of the wind farm each has advantages. The constant voltage control mode is suitable for accurate adjustment when the voltage deviation of the wind farm grid-connected point from the reference voltage is small; the voltage droop control mode is suitable for rapid adjustment of the reactive power output of the wind farm when the voltage deviation is large; the constant reactive power control mode can directly control the reactive power output of the wind farm to be the maximum / minimum value when the voltage deviation is the largest to maximize the utilization of the reactive power output capability of the wind farm; and the constant power factor control is suitable for controlling the power factor of the wind farm grid-connected point, such as the requirement of some countries or regions that the power factor of the wind farm grid-connected point is 1. Therefore, the four modes of reactive power control can be divided into two categories:

[0150] Reactive power factor control: constant power factor control mode;

[0151] Reactive-voltage control: constant reactive power control mode, voltage droop control mode, and constant voltage control mode;

[0152] In summary, considering the reactive power loss from the wind turbine to the grid-connected point, i.e., considering the reactive power loss of the wind farm, the reactive power reference value of the wind farm can be represented as:

[0153]

[0154] If the reactive power loss from the wind turbine to the grid-connected point is ignored, Q CMP = 0 can be set.

[0155] GB / T 19963.1-2021 "Technical Regulation for Wind Farms Accessing Power Systems Part 1: Land-based Wind Power" stipulates that "for wind farms accessing public power grids with voltage levels of 220 kV and below, the voltage deviation should be within the range of -3% to 7% of the nominal voltage", and requires that "wind farms should fully utilize the reactive power capacity and regulation capability of wind turbines".

[0156] The more specific processing procedures of the above steps S31, S32 and S33 can be referred to the corresponding contents disclosed in the foregoing embodiments, which will not be repeated here.

[0157] It can be seen that in the embodiment of the application, if the grid-connected point voltage is not in the first voltage dead zone range, the reactive voltage control method is selected to adjust the grid-connected point voltage. First, a plurality of voltage intervals formed by preset voltage reference values are determined, and a reactive voltage control mode corresponding to each voltage interval is determined, then a target voltage interval in which the grid-connected point voltage is located is determined, and the grid-connected point is adjusted in voltage by using the reactive voltage control mode corresponding to the target voltage interval until the grid-connected point voltage is in the second voltage dead zone range specified by the voltage hysteresis dead zone. The reactive voltage control mode includes constant reactive control mode, voltage droop control mode and constant voltage control mode. Compared with the prior art which can only manually set one of the four control modes of constant reactive, constant power factor, voltage droop and constant voltage, and cannot adaptively select the appropriate reactive regulation mode according to the actual grid-connected point voltage, the application automatically selects the wind farm reactive voltage control mode according to the deviation of the grid-connected point voltage from the preset voltage reference value and combines the advantages of constant reactive, voltage droop and constant reactive control, which can maximize the utilization of wind farm reactive regulation capacity and improve the stability of wind farm grid-connected point voltage.

[0158] Referring to Figure 10 The embodiment of the application discloses a kind of wind farm active regulation and reactive regulation control device, and the device includes:

[0159] Information monitoring module 11 is used to obtain current monitored grid-connected point frequency deviation and grid-connected point voltage in the process of wind farm operation;

[0160] Dead zone detection module 12 is used to carry out dead zone detection to the grid-connected point frequency deviation and the grid-connected point voltage, to determine whether the grid-connected point frequency deviation is in the first frequency deviation dead zone range specified by frequency deviation hysteresis dead zone, and determine whether the grid-connected point voltage is in the first voltage dead zone range specified by voltage hysteresis dead zone;

[0161] Active regulation module 13 is used to if the grid-connected point frequency deviation is not in the first frequency deviation dead zone range, then using active frequency control method to carry out active regulation to the grid-connected point frequency, until the grid-connected point frequency deviation is in the second frequency deviation dead zone range specified by the frequency deviation hysteresis dead zone;

[0162] Reactive regulation module 14 is used to if the grid-connected point voltage is not in the first voltage dead zone range, then using reactive voltage control method to carry out reactive regulation to the grid-connected point voltage, until the grid-connected point voltage is in the second voltage dead zone range specified by the voltage hysteresis dead zone.

[0163] It can be seen that, in the wind farm operation process, the current monitored grid-connected point frequency deviation and grid-connected point voltage are acquired; the grid-connected point frequency deviation and the grid-connected point voltage are subjected to dead zone detection to determine whether the grid-connected point frequency deviation is within a first frequency deviation dead zone range specified by a frequency deviation hysteresis dead zone and whether the grid-connected point voltage is within a first voltage dead zone range specified by a voltage hysteresis dead zone; if the grid-connected point frequency deviation is not within the first frequency deviation dead zone range, the grid-connected point frequency is subjected to active regulation by using an active frequency control method until the grid-connected point frequency deviation is within a second frequency deviation dead zone range specified by the frequency deviation hysteresis dead zone; if the grid-connected point voltage is not within the first voltage dead zone range, the grid-connected point voltage is subjected to reactive regulation by using a reactive voltage control method until the grid-connected point voltage is within a second voltage dead zone range specified by the voltage hysteresis dead zone. It can be seen that, in the active regulation and the reactive regulation, the concept of hysteresis dead zone is introduced, that is, the corresponding hysteresis dead zone is used to detect the monitored grid-connected point frequency deviation and grid-connected point voltage to determine whether the grid-connected point frequency deviation is within a first frequency deviation dead zone range specified by a frequency deviation hysteresis dead zone and whether the grid-connected point voltage is within a first voltage dead zone range specified by a voltage hysteresis dead zone, if not, the grid-connected point frequency is subjected to active regulation by using an active frequency control method, and the grid-connected point voltage is subjected to reactive regulation by using a reactive voltage control method, until the frequency deviation and the voltage are within a second frequency deviation dead zone range specified by the frequency deviation hysteresis dead zone and a second voltage dead zone range specified by the voltage hysteresis dead zone, respectively. Through the above scheme, the problem of frequent switching of active regulation and reactive regulation near the critical value of the single dead zone, and thus the problem of power oscillation of the grid-connected point caused by frequent switching of frequency-regulation additional active power or voltage-regulation additional reactive power, can be avoided.

[0164] Figure 11 A structural schematic diagram of an electronic device is provided for the embodiments of the present application. Specifically, it can include at least one processor 21, at least one memory 22, a power supply 23, a communication interface 24, an input / output interface 25, and a communication bus 26. The memory 22 is configured to store a computer program, and the processor 21 is configured to load and execute the computer program to implement the related steps in the control method for active regulation and reactive regulation of a wind farm performed by an electronic device disclosed in any of the preceding embodiments.

[0165] In this embodiment, the power supply 23 is configured to provide operating voltage for each hardware device on the electronic device 20; the communication interface 24 is configured to create a data transmission channel between the electronic device 20 and external devices, and the communication protocol followed by the communication interface 24 can be any communication protocol applicable to the technical solution of the present application, which will not be specifically limited herein; the input and output interface 25 is configured to obtain external input data or output data to the outside, and the specific interface type can be selected according to the specific application needs, which will not be specifically limited herein.

[0166] The processor 21 can include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 21 can be implemented in at least one of a hardware form of a DSP (Digital Signal Processing), a FPGA (Field-Programmable Gate Array), a PLA (Programmable Logic Array). The processor 21 can also include a main processor and a coprocessor. The main processor is a processor for processing data in a wake-up state, also known as a CPU (Central Processing Unit). The coprocessor is a low-power processor for processing data in a standby state. In some embodiments, the processor 21 can be integrated with a GPU (Graphics Processing Unit) that is responsible for rendering and drawing the content to be displayed on the display screen. In some embodiments, the processor 21 can also include an AI (Artificial Intelligence) processor configured to process machine learning-related computing operations.

[0167] In addition, the memory 22, as a carrier for storing resources, can be a read-only memory, a random access memory, a magnetic disk or an optical disk, etc. The resources stored thereon include an operating system 221, a computer program 222, and data 223, etc. The storage mode can be temporary storage or permanent storage.

[0168] The operating system 221 is used to manage and control each hardware device on the electronic device 20 and the computer program 222, so as to realize the operation and processing of the processor 21 on the mass data 223 in the memory 22, and can be Windows, Unix, Linux, etc. In addition to the computer program capable of completing the control method of the wind farm active regulation and the reactive regulation executed by the electronic device 20 disclosed in any one of the foregoing embodiments, the computer program 222 can further include a computer program capable of completing other specific work. In addition to the data received by the electronic device from the external device, the data 223 can also include the data collected by the self input and output interface 25, etc.

[0169] Further, the embodiment of the present application further discloses a computer readable storage medium, wherein the storage medium stores a computer program, and the computer program is loaded and executed by a processor to realize the method steps executed in the control process of the wind farm active regulation and the reactive regulation disclosed in any one of the foregoing embodiments.

[0170] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts of each embodiment can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0171] The skilled person can further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed in the present text can be realized by electronic hardware, computer software or combination of both. In order to clearly show the interchangeability of hardware and software, the composition and steps of each example have been described in the above description. Whether the functions are realized by hardware or software depends on the specific application and design constraints of the technical solution. The skilled person can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0172] The steps of the method or algorithm described in combination with the embodiments disclosed in the present text can be directly implemented by hardware, software module executed by a processor, or combination of both. The software module can be placed in a random access memory (RAM), a memory, a read only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the technical field.

[0173] Finally, it needs to be pointed out that, in this article, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the term "includes", "contains" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "includes a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0174] The above describes in detail the wind farm active power regulation and reactive power regulation control method, device, equipment and storage medium provided by the present application. The principles and implementation manners of the present application are described by applying specific examples in this article. The above example is only used to help understand the method of the present application and its core idea. Meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manner and application range will be changed. In view of the above, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A control method for active power regulation and reactive power regulation of a wind farm, characterized in that, The method comprises the following steps: acquiring the current monitored grid-connected point frequency deviation and grid-connected point voltage during the operation of the wind farm; performing out-of-hysteresis detection on the grid-connected point frequency deviation and the grid-connected point voltage to determine whether the grid-connected point frequency deviation is within a first frequency deviation dead zone range specified by a frequency deviation hysteresis dead zone and whether the grid-connected point voltage is within a first voltage dead zone range specified by a voltage hysteresis dead zone; if the grid-connected point frequency deviation is not within the first frequency deviation dead zone range, performing active regulation on the grid-connected point frequency by using an active frequency control method until the grid-connected point frequency deviation is within a second frequency deviation dead zone range specified by the frequency deviation hysteresis dead zone; the second frequency deviation dead zone range is smaller than the first frequency deviation dead zone range; if the grid-connected point voltage is not within the first voltage dead zone range, performing reactive regulation on the grid-connected point voltage by using a reactive voltage control method until the grid-connected point voltage is within a second voltage dead zone range specified by the voltage hysteresis dead zone; the second voltage dead zone range is smaller than the first voltage dead zone range; wherein the reactive regulation on the grid-connected point voltage by using the reactive voltage control method comprises: determining a plurality of voltage intervals formed by preset voltage reference values and determining a reactive voltage control mode corresponding to each voltage interval; determining a target voltage interval in which the grid-connected point voltage is located and performing voltage regulation on the grid-connected point by using the reactive voltage control mode corresponding to the target voltage interval; the determination of the plurality of voltage intervals formed by the preset voltage reference values and the determination of the reactive voltage control mode corresponding to each voltage interval comprise: constructing a first voltage interval based on a voltage ride-through threshold value and a preset specified parameter threshold value and determining the reactive voltage control mode of the first voltage interval as a constant reactive power control mode; constructing a second voltage interval based on the preset specified parameter threshold value and a voltage droop adjustment parameter threshold value and determining the reactive voltage control mode of the second voltage interval as a voltage droop control mode; constructing a third voltage interval based on the voltage droop parameter threshold value and a boundary reference value corresponding to the second voltage dead zone range and determining the reactive voltage control mode of the third voltage interval as a constant voltage control mode.

2. The control method of wind farm active and reactive regulation according to claim 1, characterized in that, Further comprising: if the grid-connected point voltage is within the first voltage dead zone range, acquiring the current detected grid-connected point power factor and performing out-of-hysteresis detection on the grid-connected point power factor to determine whether the grid-connected point power factor is within a first power factor dead zone range specified by a power factor hysteresis dead zone; if the grid-connected point power factor is not within the first power factor dead zone range, performing reactive regulation on the grid-connected point power factor by using a reactive power factor control method until the grid-connected point power factor is within a second power factor dead zone range specified by the power factor hysteresis dead zone.

3. The control method of wind farm active and reactive regulation according to claim 1, characterized in that, the active regulation on the grid-connected point frequency by using the active frequency control method comprises: judging whether the grid-connected point active power meets a preset active regulation power threshold condition; If yes, calculate inertia response additional power and primary frequency modulation additional power, and determine active power reference value based on active power of the point of common coupling, the inertia response additional power, the primary frequency modulation additional power and active power loss of the wind farm; Issue active control instruction based on the active power reference value, so as to use the active control instruction to adjust frequency of the point of common coupling.

4. The control method of wind farm active and reactive regulation according to claim 1, characterized in that, After obtaining the current monitored frequency deviation of the point of common coupling and the voltage of the point of common coupling during the operation of the wind farm, the method further comprises: Judging whether the wind farm is in a voltage ride-through mode based on the voltage of the point of common coupling; If the wind farm is not in the voltage ride-through mode, performing the step of detecting the frequency deviation of the point of common coupling and the voltage of the point of common coupling out of the dead zone; If the wind farm is in the voltage ride-through mode, performing voltage ride-through control through the wind farm.

5. The control method of wind farm active and reactive regulation according to claim 1, characterized in that, The voltage adjustment of the point of common coupling by using the reactive voltage control mode corresponding to the target voltage interval comprises: If the target voltage interval is the first voltage interval, determining a reactive power reference value based on wind farm reactive power loss and maximum value of reactive power of the point of common coupling; If the target voltage interval is the second voltage interval, determining a reactive power reference value based on wind farm reactive power loss, a preset voltage droop coefficient, the voltage droop adjustment parameter threshold, wind farm rated power and a voltage filtered value filtered from the voltage of the point of common coupling; If the target voltage interval is the third voltage interval, determining a reactive power reference value based on wind farm reactive power loss, a preset proportional integral gain, wind farm voltage reference value and the voltage filtered value; Issuing a reactive control instruction based on the reactive power reference value, so as to use the reactive control instruction to adjust voltage of the point of common coupling.

6. A control device for active power regulation and reactive power regulation of a wind farm, characterized in that It comprises: An information monitoring module, configured to obtain the current monitored frequency deviation of the point of common coupling and the voltage of the point of common coupling during the operation of the wind farm; A dead zone detection module, configured to detect the frequency deviation of the point of common coupling and the voltage of the point of common coupling out of the dead zone, so as to determine whether the frequency deviation of the point of common coupling is within a first frequency deviation dead zone range specified by a frequency deviation hysteresis dead zone, and determine whether the voltage of the point of common coupling is within a first voltage dead zone range specified by a voltage hysteresis dead zone; An active regulation module, configured to, if the frequency deviation of the point of common coupling is not within the first frequency deviation dead zone range, use an active frequency control method to adjust the frequency of the point of common coupling, until the frequency deviation of the point of common coupling is within a second frequency deviation dead zone range specified by the frequency deviation hysteresis dead zone; the second frequency deviation dead zone range is smaller than the first frequency deviation dead zone range; A reactive regulation module, configured to, if the voltage of the point of common coupling is not within the first voltage dead zone range, use a reactive voltage control method to adjust the voltage of the point of common coupling, until the voltage of the point of common coupling is within a second voltage dead zone range specified by the voltage hysteresis dead zone; the second voltage dead zone range is smaller than the first voltage dead zone range; The reactive voltage control method comprises: If the target voltage interval is the first voltage interval, determining a reactive power reference value based on wind farm reactive power loss and maximum value of reactive power of the point of common coupling; If the target voltage interval is the second voltage interval, determining a reactive power reference value based on wind farm reactive power loss, a preset voltage droop coefficient, the voltage droop adjustment parameter threshold, wind farm rated power and a voltage filtered value filtered from the voltage of the point of common coupling; If the target voltage interval is the third voltage interval, determining a reactive power reference value based on wind farm reactive power loss, a preset proportional integral gain, wind farm voltage reference value and the voltage filtered value; Issuing a reactive control instruction based on the reactive power reference value, so as to use the reactive control instruction to adjust voltage of the point of common coupling. determining a plurality of voltage intervals constituted by preset voltage reference values, and determining a reactive power voltage control mode corresponding to each of the voltage intervals; determining a target voltage interval in which the grid-connected point voltage is located, and performing voltage regulation on the grid-connected point by using the reactive power voltage control mode corresponding to the target voltage interval; the determining of the plurality of voltage intervals constituted by preset voltage reference values, and the determining of the reactive power voltage control mode corresponding to each of the voltage intervals, comprises: constructing a first voltage interval based on a voltage ride-through threshold value and a preset specified parameter threshold value, and determining the reactive power voltage control mode of the first voltage interval as a constant reactive power control mode; constructing a second voltage interval based on the preset specified parameter threshold value and a voltage droop adjustment parameter threshold value, and determining the reactive power voltage control mode of the second voltage interval as a voltage droop control mode; constructing a third voltage interval based on the voltage droop parameter threshold value and a boundary reference value corresponding to the second voltage dead zone range, and determining the reactive power voltage control mode of the third voltage interval as a constant voltage control mode.

7. An electronic device, comprising: comprises: a memory for saving a computer program; a processor for executing the computer program to implement the steps of the wind farm active regulation and reactive regulation control method according to any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, a memory for storing a computer program; wherein the computer program, when executed by a processor, implements the steps of the wind farm active regulation and reactive regulation control method according to any one of claims 1 to 5.

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