Coordinated control method for wind farm SVG, wind turbines and fixed reactive equipment

Abstract

The embodiment of the application provides a kind of wind farm SVG, wind turbine and the coordination control method and system of fixed reactive power equipment. Method includes: determining the power Q DFIG Provided by wind turbine;According to the target reactive power Q L Required by the fixed reactive power equipment obtained, the power Q SVGMAX Provided by wind farm SVG equipment, the power Q FC Provided by wind farm fixed compensation device and difference ΔQ FC , preset switching control is carried out to fixed compensation device;The voltage effective value U S Of grid-connected point is acquired, and whether voltage effective value U S It is in the preset voltage range;In the case where it is determined that voltage effective value U S Not in preset voltage range, adjust SVG equipment to compensate voltage effective value U S ;Whether the voltage effective value U S After compensation is in the preset voltage range;In the case where it is determined that voltage effective value U S After compensation is not in preset voltage range, adjust wind turbine reactive power to compensate, so that voltage effective value U S In preset voltage range, to improve equipment utilization.

Description

Technical Field

[0001] The present application relates to the field of electrical engineering technology, and in particular to a coordinated control method and system for a wind farm SVG, a wind turbine generator set, and fixed reactive equipment. Background Art

[0002] With the widespread adoption of renewable energy, the utilization of wind power is attracting increasing attention and expectations. Due to the erratic nature of wind power, grid-connected wind farms often face voltage instability. Existing wind farms are typically equipped with reactive power compensation equipment (SVG) and fixed compensation equipment (FC). These devices balance reactive power and regulate voltage within the farm, and are currently widely used in power systems.

[0003] However, current existing technologies typically require significant redundancy for switching fixed reactive power devices, resulting in a significant waste of resources. Furthermore, current compensation methods primarily rely on the coordination of reactive power compensation equipment (SVG) and fixed reactive power compensation equipment (FC). Some approaches also rely on coordinated control of the SVG and wind turbines. There is a lack of methods and strategies for coordinating the operation of wind turbines with external reactive power compensation equipment, such as the SVG. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a coordinated control method and system for a wind farm SVG, a wind turbine generator set, and fixed reactive equipment.

[0005] To achieve the above objectives, the present application provides, in a first aspect, a coordinated control method for a wind farm SVG, a wind turbine, and fixed reactive equipment, comprising:

[0006] Determine the power Q that the wind turbine can provide DFIG ;

[0007] According to the target reactive power Q required by the fixed reactive equipment L , the power Q that the wind farm SVG equipment can provide SVGMAX , the power Q provided by the fixed compensation device of the wind farm FC and the step difference ΔQ FC , perform preset switching control on the fixed compensation device;

[0008] Get the effective value of the voltage U at the grid connection point S , and determine the effective value of voltage U S Is it within the preset voltage range? S If the voltage is not within the preset range, adjust the SVG device to the effective value of the voltage U S make compensation;

[0009] Determine the effective value of the voltage after compensation US Whether it is within the preset voltage range;

[0010] After determining the effective value of the voltage U after compensation S When the voltage is not within the preset range, the reactive power of the wind turbine is adjusted to compensate so that the effective voltage value U S is within the preset voltage range.

[0011] Optionally, determine the power Q that the wind turbine can provide DFIG Including: obtaining historical power observation data of wind turbines, and recording the historical power observation data as S1, S2, ..., S in time series t ; According to S1, S2, ..., S t Predict the observation value at time t+1 According to the observed value Predicted power Q DFIG , where Q DFIGt t ; According to S1, S2, ..., S t Predict the observation value at time t+1 Including: Determine the observation value at time t+1 according to formula (1)

[0012]

[0013] Among them, w i is the observation weight at the t-i+1th moment, S t-i+1 is the observation value of the t-i+1 period, N is the number of weights, Q DFIGt t .

[0014] Optionally, the observation weights are adjusted using formula (2):

[0015] w′ i =w i +2ke i+1 S t-i+1 (2)

[0016] Where i = 1, 2, ..., N, t = N, N + 1, ..., n, n is the number of sequence data, w i is the i-th weight before adjustment, w′ i is the adjusted i-th weight, k is the learning constant, e i+1 is the forecast error for period t+1.

[0017] Optionally, according to the target reactive power Q required by the acquired fixed reactive equipment L , the power Q that the wind farm SVG equipment can provide SVGMAX ​​, the power Q provided by the fixed compensation device of the wind farm FC and the step difference ΔQ FC The preset switching control of the fixed compensation device includes: determining multiple parameters, including the reactive compensation power Q provided by the current fixed compensation device FCin 、The maximum power provided by SVG equipment Q SVGMAX , the power Q that the wind turbine can provide in real time DFIG And the target reactive power Q L When the multiple parameters satisfy the relational expression (3), a group of capacitors is added; when the relationship between the multiple parameters after adding the capacitors still satisfies the relational expression (3), a group of capacitors is continued to be added until the multiple parameters after adding the capacitors satisfy the relational expression (4);

[0018] Q FCin +Q SVGMAX +Q DFIGmin L (3);

[0019] Q FCin +Q WVGMAX +Q DFIGmin >Q L (4);

[0020] Among them, Q DFIGmin It is the minimum power that the wind turbine can provide in real time.

[0021] Optionally, the coordinated control method further comprises: after determining the plurality of parameters, if the plurality of parameters satisfy relational expression (5), removing a group of capacitors; if the relationship between the plurality of parameters after removing the capacitors still satisfies relational expression (5), continuing to remove a group of capacitors until the plurality of parameters after removing the capacitors satisfy relational expression (6);

[0022] Q FCin -Q SVGMAX -Q DFIGmax >Q L (5);

[0023] Q FCin -Q SVGMAX -Q DFIGmax L (6);

[0024] Among them, Q DFIGmax It is the maximum power that the wind turbine can provide in real time.

[0025] Optionally, the fixed capacitor adjustment step satisfies the following relationship (7):

[0026] ΔQ FC ​​<(2Q SVGMAX +Q DFIGmax +Q DEIGmin ) (7);

[0027] Where ΔQ FC For fixed capacitor adjustment, Q DFIGmin is the minimum power that the wind turbine can provide in real time, Q DFIGmax It is the maximum power that the wind turbine can provide in real time.

[0028] Optionally, the coordinated control method further includes: obtaining a voltage reference value U of the grid connection point L And the preset reasonable error value U Ldev ; According to the voltage reference value U L And the error range U Ldev Determine the lowest value U of the preset voltage range Lmin and the highest value U Lmax , among which the lowest value U Lmin is the voltage reference value U L and reasonable error value U Ldev The difference, the highest value U Lmax is the voltage reference value U L and reasonable error value U Ldev The sum of the voltage RMS value U S At the lowest value U Lmin and the highest value U Lmax In the case of the voltage between S In the preset voltage range; at the voltage RMS value U S Not at the lowest value U Lmin and the highest value U Lmax In the case of between, determine the voltage effective value U S Not within the preset voltage range.

[0029] Optionally, after determining the compensated voltage effective value U S When the voltage is not within the preset range, the reactive power of the wind turbine is adjusted to compensate so that the effective voltage value U S In the preset voltage range, the voltage effective value U after compensation is determined S When the voltage is not within the preset range and the power provided by the SVG device has reached the maximum value, the reactive power of the wind turbine is adjusted to compensate so that the effective value of the voltage U S is within the preset voltage range.

[0030] Optionally, the method further includes: monitoring the reactive output of the wind turbine generator set and the SVG device; when it is determined that there is reactive circulating current, performing reactive redistribution and simultaneously adjusting the reactive power of the wind turbine generator set and the SVG device; wherein, during the reactive redistribution process, the wind turbine generator set does not output reactive power, and simultaneously controls the SVG device to reduce the reverse reactive power output by an equal amount.

[0031] A second aspect of the present application provides a coordinated control system for a wind farm SVG, a wind turbine, and fixed reactive equipment, including:

[0032] Reactive power calculation submodule, used to determine the power Q that the wind turbine can provide DFIG ;

[0033] The switching control module is used to obtain the target reactive power Q required by the fixed reactive equipment L , the power Q that the wind farm SVG equipment can provide SVGMAX , the power Q provided by the fixed compensation device of the wind farm FC and the step difference ΔQ FC , perform preset switching control on the fixed compensation device;

[0034] System voltage monitoring submodule, used to obtain the effective value of the voltage U at the grid connection point S , and determine the effective value of voltage U S Whether it is within the preset voltage range;

[0035] The first compensation module is used to determine the effective value of the voltage U S If the voltage is not within the preset range, adjust the SVG device to the effective value of the voltage U S make compensation;

[0036] The second compensation module is used to determine the effective value of the voltage after compensation U S Is it within the preset voltage range? After determining the effective value of the voltage after compensation, U S When the voltage is not within the preset range, the reactive power of the wind turbine is adjusted to compensate so that the effective voltage value U S is within the preset voltage range.

[0037] This technical solution achieves coordinated control of the wind farm's SVG, wind turbine generators, and fixed reactive power equipment, fully leveraging the advantages of fixed reactive power equipment and improving equipment utilization. Furthermore, it implements preset switching control for the fixed compensation device, ensuring it operates at the appropriate gear, reducing the number of switching cycles required and extending the equipment's service life.

[0038] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following detailed description, they are used to explain the embodiments of the present application but do not constitute a limitation on the embodiments of the present application. In the accompanying drawings:

[0040] Figure 1 The following schematically illustrates a flow chart of a coordinated control method for a wind farm SVG, a wind turbine generator set, and fixed reactive equipment according to an embodiment of the present application;

[0041] Figure 2 Another flow chart of the coordinated control method of the wind farm SVG, wind turbines and fixed reactive equipment according to an embodiment of the present application is schematically shown;

[0042] Figure 3 The structure block diagram of the coordinated control system of the wind farm SVG, wind turbines and fixed reactive equipment according to an embodiment of the present application is schematically shown;

[0043] Figure 4 The internal structure diagram of a computer device according to an embodiment of the present application is schematically shown. DETAILED DESCRIPTION

[0044] To make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the specific implementation methods described herein are only used to illustrate and explain the embodiments of the present application and are not used to limit the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0045] Figure 1 The following schematically shows a flow chart of a coordinated control method for a wind farm SVG, a wind turbine generator set and fixed reactive equipment according to an embodiment of the present application. Figure 1 As shown, in one embodiment of the present application, a coordinated control method for a wind farm SVG, a wind turbine generator set, and a fixed reactive device is provided, comprising the following steps:

[0046] Step 101: Determine the power Q that the wind turbine can provide. DFIG .

[0047] Step 102: Calculate the target reactive power Q required by the fixed reactive equipment according to the acquired target reactive power Q. L , the power Q that the wind farm SVG equipment can provide SVGMAX , the power Q provided by the fixed compensation device of the wind farm FC and the step difference ΔQ FC, perform preset switching control on the fixed compensation device.

[0048] Step 103: Obtain the voltage effective value U of the grid connection point S , and determine the effective value of voltage U S Is it within the preset voltage range?

[0049] Step 104: Determine the effective voltage value U S If the voltage is not within the preset range, adjust the SVG device to the effective value of the voltage U S Make compensation.

[0050] Step 105: Determine the effective value of the voltage after compensation U S Is it within the preset voltage range?

[0051] Step 106: After determining the compensated voltage effective value U S When the voltage is not within the preset range, the reactive power of the wind turbine is adjusted to compensate so that the effective voltage value U S is within the preset voltage range.

[0052] Coordinated control of wind farm SVG, wind turbines and fixed reactive equipment. The processor can determine the power Q that the wind turbine can provide. DFIG The processor can then obtain the target reactive power Q required by the fixed reactive equipment L , the power Q that the wind farm SVG equipment can provide SVGMAX , the power Q provided by the fixed compensation device of the wind farm FC and the step difference ΔQ FC , to perform preset switching control on the fixed compensation device. The preset switching control may refer to switching on or off capacitors. After performing preset switching control on the fixed compensation device, the processor may obtain the voltage effective value U of the grid connection point. S , and determine the effective value of voltage U S Is it within the preset voltage range? S If the voltage is not within the preset range, the processor can adjust the SVG device to the effective value of the voltage U S Compensation is performed. S After compensation, the processor can determine the compensated voltage effective value U S Is it within the preset voltage range? After determining the effective value of the voltage after compensation, U S When the voltage is not within the preset range, the processor can adjust the reactive power of the wind turbine to compensate for the voltage RMS U S is within the preset voltage range.

[0053] This technical solution achieves coordinated control of the wind farm's SVG, wind turbine generators, and fixed reactive power equipment, fully leveraging the advantages of fixed reactive power equipment and improving equipment utilization. Furthermore, it implements preset switching control for the fixed compensation device, ensuring it operates at the appropriate gear, reducing the number of switching cycles required and extending the equipment's service life.

[0054] In one embodiment, the power Q that the wind turbine can provide is determined DFIG Including: obtaining historical power observation data of wind turbines, and recording the historical power observation data as S1, S2, ..., S in time series t ; According to S1, S2, ..., S t Predict the observation value at time t+1 According to the observed value Predicted power Q DFIG , where Q DFIGt t ; According to S1, S2, ..., S t Predict the observation value at time t+1 Including: Determine the observation value at time t+1 according to formula (1) Among them, w i is the observation weight at the t-i+1th moment, S t-i+1 is the observation value of the t-i+1 period, N is the number of weights, Q DFIGt t .

[0055] The processor can obtain the historical power observation data of the wind turbine and record the historical power observation data as S1, S2, ..., S t The time interval can be 1s. That is, a power observation data can be marked every 1s. Then, the processor can mark the power observation data according to S1, S2, ..., S t Predict the observation value at time t+1 Specifically, the processor can determine the observation value at time t+1 according to the above formula (1): In formula (1), w i is the observation weight at the t-i+1th moment, S t-i+1 is the observation value of the t-i+1 period, and N is the number of weights. In the case of Predicted power Q DFIG . Where Q DFIGt t That is, the predicted power Q at time t DFIGt Can be less than the observed value S at time t​​​t .

[0056] In one embodiment, the observation weights are adjusted using formula (2):

[0057] w′ i =w i +2ke i+1 S t-i+1 (2)

[0058] Where i = 1, 2, ..., N, t = N, N + 1, ..., n, n is the number of sequence data, w i is the i-th weight before adjustment, w′ i is the adjusted i-th weight, k is the learning constant, e i+1 is the forecast error for period t+1.

[0059] The processor can adjust the observation weights using formula (2). In formula (2), the adjusted i-th weight can be equal to the i-th weight before adjustment plus an error adjustment term. The error adjustment term can include the forecast error e of the t+1 period. i+1 , the observation value S of period t-i+1 t-i+1 And the learning constant k. Among them, the learning constant k can determine the speed of weight adjustment, and the learning constant k can be obtained by learning and fitting based on historical data.

[0060] In one embodiment, according to the target reactive power Q required by the fixed reactive equipment, L , the power Q that the wind farm SVG equipment can provide SVGMAX , the power Q provided by the fixed compensation device of the wind farm FC and the step difference ΔQ FC The preset switching control of the fixed compensation device includes: determining multiple parameters, including the reactive compensation power Q provided by the current fixed compensation device FCin 、The maximum power provided by SVG equipment Q SVGMAX , the power Q that the wind turbine can provide in real time DFIG And the target reactive power Q L When the multiple parameters satisfy the relational expression (3), a group of capacitors is added; when the relationship between the multiple parameters after adding the capacitors still satisfies the relational expression (3), a group of capacitors is continued to be added until the multiple parameters after adding the capacitors satisfy the relational expression (4);

[0061] Q FCin +Q SVGMAX +Q DFIGmin L (3);

[0062] Q​FCin +Q SVGMAX +Q DFIGmin >Q L (4);

[0063] Among them, Q DFIGmin It is the minimum power that the wind turbine can provide in real time.

[0064] The processor can obtain the target reactive power Q required by the fixed reactive equipment L , the power Q that the wind farm SVG equipment can provide SVGMAX , the power Q provided by the fixed compensation device of the wind farm FC and the step difference ΔQ FC , and perform preset switching control on the fixed compensation device. Specifically, the processor can determine multiple parameters. Among them, the multiple parameters can include the reactive compensation power Q provided by the current fixed compensation device. FCin 、The maximum power provided by SVG equipment Q SVGMAX , the power Q that the wind turbine can provide in real time DFIG And the target reactive power Q L There may be certain relationships between multiple parameters. For example, the above-mentioned relationship (3) and relationship (4). If multiple parameters satisfy the above-mentioned relationship (3), the processor can add a group of capacitors. After adding a group of capacitors, if the relationship between multiple parameters still satisfies the relationship (3), then a group of capacitors can be added until the relationship between multiple parameters satisfies the above-mentioned relationship (4). Q in the above-mentioned relationship (3) and relationship (4) DFIGmin It can be expressed as the minimum power that the wind turbine can provide in real time.

[0065] In one embodiment, the coordinated control method further includes: after determining the plurality of parameters, if the plurality of parameters satisfy the relational expression (5), removing a group of capacitors; if the relationship between the plurality of parameters after removing the capacitors still satisfies the relational expression (5), continuing to remove a group of capacitors until the plurality of parameters after removing the capacitors satisfy the relational expression (6);

[0066] Q FCin -Q SVGMAX -Q DFIGmax >Q L (5);

[0067] Q FCin -Q SVGMAX -Q DFIGmax L (6);

[0068] Among them, Q DFiGmax ​It is the maximum power that the wind turbine can provide in real time.

[0069] The multiple parameters may include the reactive compensation power Q provided by the current fixed compensation device FCin 、 Maximum power provided by SVG equipment Q SVGMAX , the power Q that the wind turbine can provide in real time DFIG And the target reactive power Q L After determining the plurality of parameters, if the relationship between the plurality of parameters satisfies the relationship (5), the processor may remove a group of capacitors. After removing a group of capacitors, if the relationship between the plurality of parameters still satisfies the relationship (5), the processor may continue to remove a group of capacitors until the relationship between the plurality of parameters after removing the capacitors satisfies the relationship (6). Q in the above relationship (5) and relationship (6) is DFIGmax It can be expressed as the maximum power that the wind turbine can provide in real time.

[0070] In one embodiment, the fixed capacitor adjustment step satisfies the following relationship (7):

[0071] ΔQ FC <(2Q SVGMAX +Q DFIGmax +Q DEIGmin ) (7);

[0072] Where ΔQ FC For fixed capacitor adjustment, Q DFIGmin is the minimum power that the wind turbine can provide in real time, Q DFIGmax It is the maximum power that the wind turbine can provide in real time.

[0073] Q SVGMAX It can refer to the maximum power provided by the SVG device. When the fixed compensation device is pre-set and switched, the fixed capacitor adjustment differential can satisfy the relationship (7). That is, the fixed capacitor adjustment differential can be less than twice the maximum power that the wind turbine can provide in real time plus the minimum power that the wind turbine can provide in real time and the maximum power provided by the SVG device.

[0074] In one embodiment, the coordinated control method further includes: obtaining a voltage reference value U of the grid connection point. L And the preset reasonable error value U Ldev ; According to the voltage reference value U L And the error range U Ldev Determine the lowest value U of the preset voltage range Lmin and the highest value U Lmax , among which the lowest value U Lmin is the voltage reference value U L and reasonable error value U LdevThe difference, the highest value U Lmax is the voltage reference value U L and reasonable error value U Ldev The sum of the voltage RMS value U S At the lowest value U Lmin and the highest value U Lmax In the case of the voltage between S In the preset voltage range; at the voltage RMS value U S Not at the lowest value U Lmin and the highest value U Lmax In the case of the voltage between S Not within the preset voltage range.

[0075] The processor can obtain the voltage reference value U of the grid connection point L And the preset reasonable error value U Ldev The processor can be based on the voltage reference value U L And the error range U Ldev Determine the lowest value U of the preset voltage range Lmin and the highest value U Lmax Among them, the lowest value U Lmin It can be expressed as voltage reference value U L and reasonable error value U Ldev The difference, the highest value U Lmax It can be expressed as voltage reference value U L and reasonable error value U Ldev The sum of the voltage RMS value U S At the lowest value U Lmin and the highest value U Lmax In the case of S In the preset voltage range. At this time, its voltage deviation can be 0. S Not at the lowest value U Lmin and the highest value U Lmax In the case of S It is not within the preset voltage range. At this time, its voltage deviation can be the voltage effective value U S With the voltage reference value U L The difference.

[0076] In one embodiment, after determining the compensated voltage effective value U S When the voltage is not within the preset range, the reactive power of the wind turbine is adjusted to compensate so that the effective voltage value U S In the preset voltage range, the voltage effective value U after compensation is determined SWhen the voltage is not within the preset range and the power provided by the SVG device has reached the maximum value, the reactive power of the wind turbine is adjusted to compensate so that the effective value of the voltage U S is within the preset voltage range.

[0077] After determining the effective value of the voltage U after compensation S When the voltage is not within the preset range, the processor can adjust the reactive power of the wind turbine to compensate for the voltage RMS U S In the preset voltage range. Specifically, after determining the effective value of the voltage after compensation U S When the voltage is not within the preset range and the power provided by the SVG device is already at its maximum value, the processor can adjust the reactive power of the wind turbine to compensate for the voltage RMS U S In the preset voltage range. Among them, the compensated voltage effective value U S Not within the preset voltage range may refer to the voltage effective value U S Not at the lowest value U Lmin and the highest value U Lmax At this time, the voltage deviation can be the effective value of voltage U S With the voltage reference value U L Specifically, when the voltage deviation ΔU≠0 is detected and Q SVG =Q SVGMAX When the processor can adjust the reactive power of the wind turbine to compensate, the voltage can be fine-tuned, so that the effective value of the voltage U S is within the preset voltage range.

[0078] In one embodiment, the method further includes: monitoring the reactive power output of the wind turbine generator set and the SVG device; and when it is determined that reactive circulating current exists, performing reactive power redistribution and simultaneously adjusting the reactive power of the wind turbine generator set and the SVG device; wherein, during the reactive power redistribution process, the wind turbine generator set does not output reactive power, and simultaneously controls the SVG device to reduce an equal amount of reverse reactive power output.

[0079] If after the reactive power of the wind turbine is compensated, the effective value of its voltage is not within the preset voltage range, the processor can monitor the reactive output of the wind turbine and the SVG device. It can then be determined whether there is reactive circulation. The reactive circulation situation may refer to the situation where the wind turbine emits capacitive reactive power and the SVG device emits inductive reactive power, or the wind turbine emits inductive reactive power and the SVG device emits capacitive reactive power. To determine whether there is reactive circulation, the reactive circulation flag can be used. When the reactive circulation flag is 1, it can be determined that there is reactive circulation. When it is determined that there is reactive circulation, the processor can perform reactive redistribution and simultaneously adjust the reactive power of the wind turbine and the SVG device. During the reactive redistribution process, the wind turbine may not output reactive power, and at the same time control the SVG device to reduce the reverse reactive power output by an equal amount, and the reactive output of the wind turbine and the SVG device can be monitored again.

[0080] In one embodiment, Figure 2 A flow chart of a coordinated control method for wind farm SVGs, wind turbines, and fixed reactive power devices is also provided. A processor obtains historical wind turbine power data and uses a time series method to predict wind power. The processor then sets the fixed capacitor compensation level based on the target power, the maximum reactive power that the SVG can provide, the power that the wind turbine can provide, and the fixed capacitor switching differential. If the SVG and the existing FC compensation capacity are insufficient to meet the target reactive power, a group of FCs is activated until the target reactive power is met. FCs can refer to capacitors. The processor then determines whether the voltage meets the requirements. If so, adjustment is completed. If not, the processor utilizes the SVG's fast response to perform reactive power adjustment to bring the voltage within the requirements. After the initial reactive power adjustment, the processor determines again whether the voltage meets the requirements. If so, adjustment is completed. If not, the processor adjusts the reactive power output of the wind turbine to perform a secondary fine-tuning of the voltage. The reactive power output of the wind turbine can be distributed according to the equal power factor principle. The processor monitors the reactive power output of the wind turbines and SVG devices and determines whether circulating reactive power exists. If no circulating reactive power exists, the adjustment ends. If so, the processor redistributes reactive power and optimizes the reactive power output of the SVG devices and wind turbines.

[0081] This technical solution achieves coordinated control of the wind farm's SVG, wind turbine generators, and fixed reactive power equipment, fully leveraging the advantages of fixed reactive power equipment and improving equipment utilization. Furthermore, it implements preset switching control for the fixed compensation device, ensuring it operates at the appropriate gear, reducing the number of switching cycles required and extending the equipment's service life.

[0082] Figure 1 FIG. 1 is a flow chart of a coordinated control method for a wind farm SVG, a wind turbine generator set and fixed reactive power equipment in one embodiment. It should be understood that although Figure 1 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. In addition, Figure 1 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0083] In one embodiment, Figure 3 As shown, a coordinated control system for a wind farm SVG, a wind turbine and fixed reactive equipment is provided, including a reactive power calculation submodule, a switching control module, a system voltage monitoring submodule, a first compensation module and a second compensation module, wherein:

[0084] Reactive power calculation submodule 301 is used to determine the power Q that the wind turbine can provide. DFIG .

[0085] The switching control module 302 is used to obtain the target reactive power Q required by the fixed reactive equipment. L , the power Q that the wind farm SVG equipment can provide SVGMAX , the power Q provided by the fixed compensation device of the wind farm FC and the step difference ΔQ FC , perform preset switching control on the fixed compensation device.

[0086] System voltage monitoring submodule 303 is used to obtain the voltage effective value U of the grid connection point S , and determine the effective value of voltage U S Is it within the preset voltage range?

[0087] The first compensation module 304 is used to determine the effective value of the voltage U SIf the voltage is not within the preset range, adjust the SVG device to the effective value of the voltage U S Make compensation.

[0088] The second compensation module 305 is used to determine the effective value of the voltage after compensation U S Is it within the preset voltage range? After determining the effective value of the voltage after compensation, U S When the voltage is not within the preset range, the reactive power of the wind turbine is adjusted to compensate so that the effective voltage value U S is within the preset voltage range.

[0089] The reactive power calculation submodule 301 can determine the power Q that the wind turbine can provide. DFIG Specifically, the reactive power calculation submodule 301 can obtain historical power observation data of the wind turbine generator set, and record the historical power observation data as S1, S2, ..., S t The time interval can be 1s. That is, a power observation data can be marked every 1s. Then, the reactive power calculation submodule 301 can calculate the power of the reactive power according to S1, S2, ..., S t Predict the observation value at time t+1 Specifically, the reactive power calculation submodule 301 can determine the observed value at time t+1 according to the above formula (1): In formula (1), w i is the observation weight at the t-i+1th moment, S t-i+1 is the observation value of the t-i+1 period, and N is the number of weights. In the case of reactive power calculation submodule 301, the reactive power calculation submodule 301 can calculate the reactive power according to the observed value. Predicted power Q DFIG . Where Q DFIGt t That is, the predicted Q at time t DFIGt It can be less than the observation value S at time t t .

[0090] The switching control module 302 can obtain the target reactive power Q required by the fixed reactive equipment. L , the power Q that the wind farm SVG equipment can provide SVGMAX , the power Q provided by the fixed compensation device of the wind farm FC and the step difference ΔQ FC , and perform preset switching control on the fixed compensation device. The switching control module 302 can obtain the target reactive power Q required by the fixed reactive equipment. L , the power Q that wind farm SVG equipment can provide SVGMAX , the power Q provided by the fixed compensation device of the wind farm​FC and the step difference ΔQ FC , the fixed compensation device is preset for switching control. Specifically, the switching control module 302 can determine multiple parameters. Among them, the multiple parameters can include the reactive compensation power Q provided by the current fixed compensation device. FCin 、The maximum power provided by SVG equipment Q SVGMAX , the power Q that the wind turbine can provide in real time DFIG And the target reactive power Q L There can be certain relationships between multiple parameters. For example, Q FCin +Q SVGMAX +Q DFIGmin L , in order to facilitate the subsequent description, this relationship can be expressed as relationship (3). FCin +Q SVGMAX +Q DFIGmin >Q L , in order to facilitate the subsequent description, this relationship can be expressed as relationship (4). DFIGmin It can be expressed as the minimum power that the wind turbine can provide in real time. If multiple parameters satisfy the above relationship (3), the switching control module 302 can add a group of capacitors. After adding a group of capacitors, if the relationship between the multiple parameters still satisfies the relationship (3), the switching control module 302 can continue to add a group of capacitors until the relationship between the multiple parameters satisfies the above relationship (4).

[0091] The system voltage monitoring submodule 303 can obtain the voltage effective value U of the grid connection point. S , and determine the effective value of voltage U S Whether it is within the preset voltage range. The first compensation module 304 can determine the voltage effective value U S If the voltage is not within the preset range, adjust the SVG device to the effective value of the voltage U S Specifically, after determining the effective value of the voltage after compensation U S When the voltage is not within the preset range and the power provided by the SVG device has reached the maximum value, the first compensation module 304 can adjust the reactive power of the wind turbine to compensate so that the effective voltage value U S The second compensation module 305 can determine the effective value of the voltage after compensation U S Is it within the preset voltage range? After determining the effective value of the voltage after compensation, U S When the voltage is not within the preset range, the reactive power of the wind turbine is adjusted to compensate so that the effective voltage value U S is within the preset voltage range.

[0092] ​The coordinated control system of the wind farm SVG, wind turbines, and fixed reactive equipment includes a processor and a memory. The reactive power calculation submodule, switching control module, system voltage monitoring submodule, first compensation module, and second compensation module are all stored in the memory as program units. The processor executes the program modules stored in the memory to implement corresponding functions.

[0093] The processor includes a kernel, which retrieves the corresponding program unit from the memory. One or more kernels can be provided, and the coordinated control method for the wind farm SVG, wind turbines, and fixed reactive equipment is implemented by adjusting kernel parameters.

[0094] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0095] An embodiment of the present application provides a storage medium storing a program, which, when executed by a processor, implements the above-mentioned coordinated control method of the wind farm SVG, wind turbines, and fixed reactive equipment.

[0096] An embodiment of the present application provides a processor, which is used to run a program. When the program is run, the coordinated control method of the wind farm SVG, wind turbines, and fixed reactive equipment is executed.

[0097] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 4 As shown. The computer device includes a processor A01, a network interface A02, a memory (not shown in the figure) and a database (not shown in the figure) connected via a system bus. The processor A01 of the computer device is used to provide computing and control capabilities. The memory of the computer device includes an internal memory A03 and a non-volatile storage medium A04. The non-volatile storage medium A04 stores an operating system B01, a computer program B02 and a database (not shown in the figure). The internal memory A03 provides an environment for the operation of the operating system B01 and the computer program B02 in the non-volatile storage medium A04. The database of the computer device is used to store data such as voltage effective values. The network interface A02 of the computer device is used to communicate with an external terminal via a network connection. When the computer program B02 is executed by the processor A01, a coordinated control method for a wind farm SVG, a wind turbine and fixed reactive equipment is implemented.

[0098] Those skilled in the art will understand that Figure 4The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0099] The embodiment of the present application provides a device, which includes a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, the following steps are performed: determining the power Q that a wind turbine can provide DFIG ; According to the target reactive power Q required by the fixed reactive equipment L , the power Q that the wind farm SVG equipment can provide SVGMAX , the power Q provided by the fixed compensation device of the wind farm FC and the step difference ΔQ FC , perform preset switching control on the fixed compensation device; obtain the effective value of the voltage U at the grid connection point S , and determine the effective value of voltage U S Is it within the preset voltage range? S If the voltage is not within the preset range, adjust the SVG device to the effective value of the voltage U S Perform compensation; determine the effective value of the voltage after compensation U S Is it within the preset voltage range? After determining the effective value of the voltage after compensation, U S When the voltage is not within the preset range, the reactive power of the wind turbine is adjusted to compensate so that the effective voltage value U S is within the preset voltage range.

[0100] In one embodiment, the power Q that the wind turbine can provide is determined DFIG Including: obtaining historical power observation data of wind turbines, and recording the historical power observation data as S1, S2, ..., S in time series t ; According to S1, S2, ..., S t Predict the observation value at time t+1 According to the observed value Predicted power Q DFIG , where Q DFIGt t ; According to S1, S2, ..., S t Predict the observation value at time t+1 Including: Determine the observation value at time t+1 according to formula (1)

[0101]

[0102] Among them, w​i is the observation weight at the t-i+1th moment, S t-i+1 is the observation value of the t-i+1 period, N is the number of weights, Q DFIGt t .

[0103] In one embodiment, the observation weights are adjusted using formula (2):

[0104] w′ i =w i +2ke i+1 S t-i+1 (2)

[0105] Where i = 1, 2, ..., N, t = N, N + 1, ..., n, n is the number of sequence data, w i is the i-th weight before adjustment, w′ i is the adjusted i-th weight, k is the learning constant, e i+1 is the forecast error for period t+1.

[0106] In one embodiment, according to the target reactive power Q required by the fixed reactive equipment, L , the power Q that the wind farm SVG equipment can provide SVGMAX , the power Q provided by the fixed compensation device of the wind farm FC and the step difference ΔQ FC The preset switching control of the fixed compensation device includes: determining multiple parameters, including the reactive compensation power Q provided by the current fixed compensation device FCin 、The maximum power provided by SVG equipment Q SVGMAX , the power Q that the wind turbine can provide in real time DFIG And the target reactive power Q L When the multiple parameters satisfy the relational expression (3), a group of capacitors is added; when the relationship between the multiple parameters after adding the capacitors still satisfies the relational expression (3), a group of capacitors is continued to be added until the multiple parameters after adding the capacitors satisfy the relational expression (4);

[0107] Q FCin +Q SVGMAX +Q DFIGmin L (3);

[0108] Q FCin +Q SVGMAX +Q DFIGmin >Q L (4);

[0109] Among them, Q DFIGmin ​​It is the minimum power that the wind turbine can provide in real time.

[0110] In one embodiment, the coordinated control method further includes: after determining the plurality of parameters, if the plurality of parameters satisfy the relational expression (5), removing a group of capacitors; if the relationship between the plurality of parameters after removing the capacitors still satisfies the relational expression (5), continuing to remove a group of capacitors until the plurality of parameters after removing the capacitors satisfy the relational expression (6);

[0111] Q FCin -Q SVGMAX -Q DFIGmax >Q L (5);

[0112] Q FCin -Q SVGMAX -Q DFIGmax L (6);

[0113] Among them, Q DFIGmax It is the maximum power that the wind turbine can provide in real time.

[0114] In one embodiment, the fixed capacitor adjustment step satisfies the following relationship (7):

[0115] ΔQ FC <(2Q SVGMAX +Q DFIGmax +Q DEIGmin ) (7);

[0116] Where ΔQ FC For fixed capacitor adjustment, Q DFIGmin is the minimum power that the wind turbine can provide in real time, Q DFIGmax It is the maximum power that the wind turbine can provide in real time.

[0117] In one embodiment, the coordinated control method further includes: obtaining a voltage reference value U of the grid connection point. L And the preset reasonable error value U Ldev ; According to the voltage reference value U L And the error range U Ldev Determine the lowest value U of the preset voltage range Lmin and the highest value U Lmax , among which the lowest value U Lmin is the voltage reference value U L and reasonable error value U Ldev The difference, the highest value U Lmax is the voltage reference value U L and reasonable error value U Ldev The sum of the voltage RMS value U S At the lowest value U​Lmin and the highest value U Lmax In the case of the voltage between S In the preset voltage range; at the voltage RMS value U S Not at the lowest value U Lmin and the highest value U Lmax In the case of the voltage between S Not within the preset voltage range.

[0118] In one embodiment, after determining the compensated voltage effective value U S When the voltage is not within the preset range, the reactive power of the wind turbine is adjusted to compensate so that the effective voltage value U S In the preset voltage range, the voltage effective value U after compensation is determined S When the voltage is not within the preset range and the power provided by the SVG device has reached the maximum value, the reactive power of the wind turbine is adjusted to compensate so that the effective value of the voltage U S is within the preset voltage range.

[0119] In one embodiment, the method further includes: monitoring the reactive power output of the wind turbine generator set and the SVG device; and when it is determined that reactive circulating current exists, performing reactive power redistribution and simultaneously adjusting the reactive power of the wind turbine generator set and the SVG device; wherein, during the reactive power redistribution process, the wind turbine generator set does not output reactive power, and simultaneously controls the SVG device to reduce an equal amount of reverse reactive power output.

[0120] The present application also provides a computer program product, which, when executed on a data processing device, is suitable for executing the program steps of the coordinated control method for initializing a wind farm SVG, a wind turbine generator set and a fixed reactive device.

[0121] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0122] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0123] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0124] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0125] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0126] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0127] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0128] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0129] The above are merely embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A coordinated control method for wind farm SVG, wind turbines and fixed reactive equipment, characterized in that: include: Determine the power that the wind turbine can provide ; According to the target reactive power required by the fixed reactive equipment obtained , the power that wind farm SVG equipment can provide , the power provided by the fixed compensation device of the wind farm and the difference , perform preset switching control on the fixed compensation device; Get the effective voltage value of the grid connection point , and determine the effective value of the voltage Whether it is within the preset voltage range; In determining the effective value of the voltage If the voltage is not within the preset range, the SVG device is adjusted to adjust the effective value of the voltage. make compensation; Determine the effective value of the voltage after compensation whether it is within the preset voltage range; After determining the effective value of the voltage after compensation When the voltage is not within the preset range, the reactive power of the wind turbine is adjusted to compensate so that the effective value of the voltage is within the preset voltage range; Wherein, the target reactive power required by the fixed reactive equipment is obtained , the power that wind farm SVG equipment can provide , the power provided by the fixed compensation device of the wind farm and the difference , the preset switching control of the fixed compensation device includes: Determine multiple parameters, including the reactive compensation power provided by the current fixed compensation device , the maximum power provided by the SVG device , the power that the wind turbine can provide in real time and the target reactive power ; When the plurality of parameters satisfy the relation (3), a group of capacitors is added; When the relationship between the multiple parameters after adding capacitors still satisfies the relationship (3), continue adding a group of capacitors until the multiple parameters after adding capacitors satisfy the relationship (4); （3）； （4）； in, It is the minimum power that the wind turbine can provide in real time.

2. The coordinated control method of wind farm SVG, wind turbines and fixed reactive equipment according to claim 1, characterized in that: Determining the power that the wind turbine can provide include: Obtain the historical power observation data of the wind turbine generator set, and record the historical power observation data in time series as ; according to Predict Observation value at time ; According to the observed value Predict the power ,in ; The basis Predict Observation value at time Including: According to formula (1) Observation value at time : （1）； in, For the The weight of the observation value at time, For the The observed value of the period, is the number of weights, .

3. The coordinated control method of wind farm SVG, wind turbines and fixed reactive equipment according to claim 2, characterized in that: It also includes adjusting the weight of the observation value through formula (2): （2） in, , is the number of sequence data, Before adjustment Weights, After adjustment Weights, is the learning constant, For the The forecast error of the period.

4. The coordinated control method of wind farm SVG, wind turbines and fixed reactive equipment according to claim 1, characterized in that: The coordinated control method further includes: After determining the plurality of parameters, cutting off a group of capacitors when the plurality of parameters satisfy the relation (5); When the relationship between the multiple parameters after the capacitors are removed still satisfies the relational expression (5), a group of capacitors is continued to be removed until the multiple parameters after the capacitors are removed satisfy the relational expression (6); （5）； （6）； in, It is the maximum power that the wind turbine can provide in real time.

5. The coordinated control method of a wind farm SVG, a wind turbine generator set and fixed reactive equipment according to claim 1 or 4, characterized in that: The fixed capacitor adjustment step difference satisfies the following relationship (7): （7）； in, To adjust the differential for fixed capacitors, is the minimum power that the wind turbine can provide in real time, It is the maximum power that the wind turbine can provide in real time.

6. The coordinated control method of wind farm SVG, wind turbines and fixed reactive equipment according to claim 1, characterized in that: The coordinated control method further includes: Get the voltage reference value of the grid connection point and the preset reasonable error value ; According to the voltage reference value And the reasonable error value Determine the lowest value of the preset voltage range and the highest value , among which the lowest value The voltage reference value and reasonable error value The difference, the highest value The voltage reference value and reasonable error value of and; The effective value of the voltage At the lowest value and the highest value In the case between is within the preset voltage range; The effective value of the voltage Not at the stated minimum and the highest value In the case between Not within the preset voltage range.

7. The coordinated control method for wind farm SVG, wind turbines and fixed reactive equipment according to claim 6, characterized in that: The effective value of the voltage after determining the compensation When the voltage is not within the preset range, the reactive power of the wind turbine is adjusted to compensate so that the effective value of the voltage Being within the preset voltage range includes: After determining the effective value of the voltage after compensation When the voltage is not within the preset range and the power provided by the SVG device is already at the maximum value, the reactive power of the wind turbine is adjusted to compensate so that the effective value of the voltage is within the preset voltage range.

8. The coordinated control method for wind farm SVG, wind turbines and fixed reactive equipment according to claim 1, characterized in that: Also includes: Monitoring the reactive power output of the wind turbine and the SVG device; When it is determined that there is reactive circulating current, reactive power redistribution is performed, and reactive power of the wind turbine and the SVG device is adjusted simultaneously; In the process of reactive power redistribution, the wind turbine generator set does not output reactive power, and at the same time controls the SVG device to reduce the reverse reactive power outputted by the same amount.

9. A coordinated control system for wind farm SVG, wind turbines and fixed reactive equipment, characterized in that: include: Reactive power calculation submodule, used to determine the power that the wind turbine can provide ; The switching control module is used to obtain the target reactive power required by the fixed reactive equipment , the power that wind farm SVG equipment can provide , the power provided by the fixed compensation device of the wind farm and the difference , perform preset switching control on the fixed compensation device; System voltage monitoring submodule, used to obtain the effective value of the voltage at the grid connection point , and determine the effective value of the voltage Whether it is within the preset voltage range; The first compensation module is used to determine the effective value of the voltage If the voltage is not within the preset range, the SVG device is adjusted to adjust the effective value of the voltage. make compensation; The second compensation module is used to determine the effective value of the voltage after compensation Whether it is within the preset voltage range; after determining the effective value of the voltage after the compensation When the voltage is not within the preset range, the reactive power of the wind turbine is adjusted to compensate so that the effective value of the voltage is within the preset voltage range; Wherein, the target reactive power required by the fixed reactive equipment is obtained , the power that wind farm SVG equipment can provide , the power provided by the fixed compensation device of the wind farm and the difference , the preset switching control of the fixed compensation device includes: Determine multiple parameters, including the reactive compensation power provided by the current fixed compensation device , the maximum power provided by the SVG device , the power that the wind turbine can provide in real time and the target reactive power ; When the plurality of parameters satisfy the relation (3), a group of capacitors is added; When the relationship between the multiple parameters after adding capacitors still satisfies the relationship (3), continue adding a group of capacitors until the multiple parameters after adding capacitors satisfy the relationship (4); （3）； （4）； in, It is the minimum power that the wind turbine can provide in real time.

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