Wind power cluster multi-station coordinated adaptive voltage control method, device, equipment and medium

Abstract

The invention relates to the technical field of new energy power generation, in particular to a wind power cluster multi-station coordinated adaptive voltage control method, device and equipment and a medium, and the method comprises the steps: constructing a three-layer coordinated voltage control architecture of a wind power cluster AVC master station-AVC coordinated substation-rapid AVC substation, and determining hierarchical control function requirements and interlayer high-speed communication; confirming a reactive power distribution algorithm of the AVC coordination substation and the rapid AVC substation; with the response speed as a reference, reactive power resources are classified, and steady-state replacement control and emergency scheduling mainly participating in reactive power are determined; and designing a voltage control action strategy according to a reactive power distribution algorithm, steady-state replacement control and emergency scheduling, and realizing coordinated adaptive voltage control of multiple stations. According to the invention, the problems of reactive surging and bus voltage oscillation caused by reactive resource response difference and asynchronous communication are improved, the bus voltage regulation speed is improved, and the disqualification probability of the bus voltage is reduced.

Description

Technical Field

[0001] The present invention relates to the field of renewable energy power generation technology, and in particular to a method, device, equipment and medium for coordinated adaptive voltage control of multiple sites in a wind power cluster. Background Art

[0002] In recent years, wind power generation has achieved rapid growth due to its advantages such as green environmental protection, convenient resource acquisition and significant cost-effectiveness. However, the volatility of its output power poses a challenge to the stability of the power system. To cope with this problem, the industry has launched an in-depth research and application boom of automatic voltage control (AVC) technology based on the characteristics of wind power generation. However, traditional AVC is a two-layer voltage control architecture of the main station and the substation. The control cycle under this architecture is long. When the bus voltage exceeds the limit due to the fluctuation of the wind turbine output, the voltage action is slow and the probability of bus voltage failure is high.

[0003] In the multi-station voltage control system of a wind power cluster, due to the different communication links and physical distances between the master station and each substation, and the different response times of different reactive resources, the bus reactive power surges back and forth, causing the bus voltage to oscillate, reducing the stability and reliability of the power grid.

[0004] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0005] The present invention provides a method, device, equipment and medium for coordinated adaptive voltage control of multiple sites in a wind power cluster, thereby effectively solving the problems in the background technology.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: a wind power cluster multi-station coordinated adaptive voltage control method, comprising the following steps:

[0007] Construct a three-layer coordinated voltage control architecture of wind power cluster AVC master station-AVC coordination substation-fast AVC substation, and establish hierarchical control function requirements and high-speed communication between layers;

[0008] Confirm the reactive power distribution algorithm of AVC coordination substation and fast AVC substation;

[0009] Based on the response speed, reactive resources are classified to determine the main participants in the steady-state replacement control and emergency dispatch of reactive power;

[0010] According to the reactive power distribution algorithm, steady-state replacement control and emergency dispatch, a voltage control action strategy is designed to achieve coordinated adaptive voltage control of multiple stations.

[0011] Furthermore, in the three-layer coordinated voltage control architecture, the AVC coordination substation is used as the key control layer, including:

[0012] The voltage control point is placed on the bus voltage side of the substation to which the wind farm is connected;

[0013] According to the changes in regional power flow, the AVC master station calculates the bus voltage target value of each substation and sends it to the AVC coordination substation. The AVC coordination substation calculates the reactive power target value based on the voltage target value and transmits it to the fast AVC substation to respond to the increase or decrease of reactive power operations for various reactive resources in multiple stations.

[0014] Furthermore, the establishment of hierarchical control function requirements and inter-layer high-speed communication includes:

[0015] The AVC master station has the ability to calculate the power flow of layers and zones and the ability to identify the operation mode, and can formulate dynamic substation bus voltage control targets according to the power flow changes of the regional power grid;

[0016] Establish a high-speed and reliable communication network between the AVC master station and the AVC cooperative control substation;

[0017] Establish a high-speed and reliable communication network between the AVC cooperative control substation and each wind farm fast AVC substation;

[0018] Deploy a complete fast AVC substation system in the wind farm that meets the regional grid regulations;

[0019] The AVC master station can establish a preset point table with the AVC co-control substation;

[0020] The AVC cooperative control substation establishes a preset point table with each wind farm fast AVC substation;

[0021] Each wind farm has available reactive resources;

[0022] The AVC cooperative control substation has the function of substation bus voltage control;

[0023] The fast AVC substation has the function of reactive power control on-site.

[0024] Furthermore, the reactive power allocation algorithm for confirming the AVC coordination substation and the fast AVC substation includes:

[0025] The AVC coordination substation adopts an equal reactive power margin algorithm, and the fast AVC substation adopts a reactive power distribution algorithm including an equal reactive power margin algorithm.

[0026] Furthermore, the reactive power allocation algorithm for confirming the AVC coordination substation and the fast AVC substation further includes:

[0027] The AVC cooperative control substation decomposes the voltage target value, controls according to the predetermined voltage step, decomposes again, and controls again. The instruction transmission, analysis and distribution consume time. The time parameters of each link of the AVC cooperative control substation must follow the set size relationship;

[0028] Among them, the voltage target value issuance cycle is greater than the voltage closed-loop control time, the voltage closed-loop control time is greater than the sum of the flight time of the total reactive power command and the reactive closed-loop control cycle, and the reactive closed-loop control cycle is greater than the sum of the station reactive power calculation and command decomposition, the flight time of the station reactive power command, and the response time of the station reactive power command.

[0029] Furthermore, the classification of reactive resources includes:

[0030] The multi-time-sequence reactive resources of wind farms are classified according to their response speed. The reactive resources with a response speed of hundreds of milliseconds are classified into Class A, which participate in steady-state rapid dispatch and emergency dispatch of reactive power. The remaining reactive resources with slow response speeds are classified into Class B, which participate in steady-state replacement control and emergency dispatch of reactive power.

[0031] Furthermore, the voltage control action strategy includes:

[0032] The AVC cooperative control substation adopts a two-level voltage control algorithm. The control objects and control cycles of the two-level voltage control include:

[0033] The primary voltage control is closed-loop for the target voltage value of the master station, and the secondary voltage control is closed-loop for the voltage regulation step. The control period of the primary voltage control is much longer than that of the secondary voltage control.

[0034] Among them, the secondary voltage control can only be started when there is a margin of Class A reactive resources; both levels of voltage control algorithms take the reactive step size into consideration and are subject to the upper and lower limits of the station reactive reference.

[0035] Furthermore, the voltage control action strategy also includes:

[0036] When the fast AVC substation receives control instructions from the AVC co-control substation, it performs fast control with Class A reactive resources as the priority control object. When Class A reactive resources are insufficient, Class B reactive resources are called upon. The reactive adjustment step of the fast AVC substation must be smaller than that of the AVC co-control substation, and the adjustment range is constrained by the upper and lower limits of the station reactive reference.

[0037] Furthermore, the voltage control action strategy also includes:

[0038] When the following conditions occur, use Class B reactive resources to replace Class A reactive resources:

[0039] The AVC co-control substation has no action;

[0040] The Class A reactive resources of the station have output;

[0041] The station has sufficient Class B reactive resources.

[0042] Furthermore, the two-level voltage control algorithm further includes the following steps when the new energy is centrally connected to the substation:

[0043] When the bus voltage is within the upper reverse pull limit, the reactive power increase will not be blocked;

[0044] When the bus voltage is within the upper reverse pull limit, it responds normally to the dispatching master station command;

[0045] When the bus voltage is outside the upper reverse pull limit, the reactive power is increased;

[0046] When the bus voltage is outside the upper reverse pull limit, the reverse pull control strategy is started, and the bus voltage is adjusted back to within the dead zone range of the voltage target value of the dispatching master station.

[0047] The present invention also includes a wind power cluster multi-station coordinated adaptive voltage control device, using the above method, the device includes:

[0048] The architecture building unit is used to build a three-layer coordinated voltage control architecture of wind power cluster AVC master station-AVC coordination substation-fast AVC substation, establish hierarchical control function requirements and high-speed communication between layers;

[0049] A distribution algorithm unit, used to confirm the reactive power distribution algorithm of the AVC coordination substation and the fast AVC substation;

[0050] A resource classification unit is used to classify reactive resources based on response speed and determine the main participants in reactive steady-state replacement control and emergency dispatch;

[0051] The control strategy unit is used to design a voltage control action strategy according to the reactive power distribution algorithm, steady-state replacement control and emergency dispatch, so as to realize coordinated adaptive voltage control of multiple stations.

[0052] The present invention also includes a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method described above is implemented.

[0053] The present invention also includes a storage medium on which a computer program is stored. When the computer program is executed by a processor, the method described above is implemented.

[0054] The beneficial effects of the present invention are: confirming the reactive power distribution algorithm of the AVC coordination substation and the fast AVC substation according to the field source situation; classifying reactive resources with reference to the response speed, and designing the voltage control substation action strategy to realize the adaptive voltage control function of multiple fields. In view of the drawbacks of the double-layer AVC control mode, this method adds a control level and designs a collaborative strategy to realize the voltage control function in the application scenario of wind power multi-fields, improves the reactive power surge and bus voltage oscillation problems caused by reactive resource response differences and communication asynchrony, improves the bus voltage regulation speed, and reduces the probability of bus voltage failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0056] Figure 1 is a flow chart of the method in Example 1;

[0057] Figure 2 It is a structural schematic diagram of the device in Example 1;

[0058] Figure 3 This is the implementation process of the adaptive voltage control method in Example 2.

[0059] Figure 4 This is a schematic diagram of the deployment of the three-layer control system structure for coordinated voltage of a wind power cluster in Example 2.

[0060] Figure 5 This is a schematic diagram of two-stage voltage control for regulating voltage rise when the Class A reactive resource margin is sufficient in Example 2.

[0061] Figure 6 This is a schematic diagram of two-stage voltage control for regulating voltage rise when the Class A reactive resource margin is insufficient in Example 2.

[0062] Figure 7 This is a schematic diagram of voltage reverse pull control when the Class A reactive resource margin is sufficient or not in Example 2.

[0063] Figure 8 It is a structural schematic diagram of the computer device of the present invention. DETAILED DESCRIPTION

[0064] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0065] like Figure 1 A method for coordinated adaptive voltage control of multiple wind power cluster stations is shown, comprising the following steps:

[0066] Construct a three-layer coordinated voltage control architecture of wind power cluster AVC master station-AVC coordination substation-fast AVC substation, and establish hierarchical control function requirements and high-speed communication between layers;

[0067] Confirm the reactive power distribution algorithm of AVC coordination substation and fast AVC substation;

[0068] Based on the response speed, reactive resources are classified to determine the main participants in the steady-state replacement control and emergency dispatch of reactive power;

[0069] According to the reactive power distribution algorithm, steady-state replacement control and emergency dispatch, the voltage control action strategy is designed to realize coordinated adaptive voltage control of multiple stations.

[0070] According to the source conditions, the reactive power distribution algorithm of the AVC coordination substation and the fast AVC substation is confirmed; the reactive power resources are classified based on the response speed, and the voltage control substation action strategy is designed to realize the adaptive voltage control function of multiple stations. In view of the drawbacks of the two-layer AVC control mode, this method adds a control level and designs a collaborative strategy to realize the voltage control function in the application scenario of wind power multiple stations, improves the reactive power surge and bus voltage oscillation caused by reactive power resource response differences and communication asynchrony, improves the bus voltage regulation speed, and reduces the probability of bus voltage failure.

[0071] In this embodiment, in the three-layer coordinated voltage control architecture, the AVC coordination substation is used as the key control layer, including:

[0072] The voltage control point is placed on the bus voltage side of the substation to which the wind farm is connected;

[0073] According to the changes in regional power flow, the AVC master station calculates the bus voltage target value of each substation and sends it to the AVC coordination substation. The AVC coordination substation calculates the reactive power target value based on the voltage target value and transmits it to the fast AVC substation to respond to the increase or decrease of reactive power operations for various reactive resources in multiple stations.

[0074] Establish hierarchical control functional requirements and high-speed communication between layers, including:

[0075] The AVC master station has the ability to calculate the power flow of layers and zones and the ability to identify the operation mode, and can formulate dynamic substation bus voltage control targets according to the power flow changes of the regional power grid;

[0076] Establish a high-speed and reliable communication network between the AVC master station and the AVC cooperative control substation;

[0077] Establish a high-speed and reliable communication network between the AVC cooperative control substation and each wind farm fast AVC substation;

[0078] Deploy a complete fast AVC substation system in the wind farm that meets the regional grid regulations;

[0079] The AVC master station can establish a preset point table with the AVC co-control substation;

[0080] The AVC cooperative control substation establishes a preset point table with each wind farm fast AVC substation;

[0081] Each wind farm has available reactive resources;

[0082] The AVC cooperative control substation has the function of substation bus voltage control;

[0083] The fast AVC substation has the function of reactive power control on-site.

[0084] Among them, the reactive power distribution algorithm of the AVC coordination substation and the fast AVC substation is confirmed, including:

[0085] The AVC coordination substation adopts an equal reactive power margin algorithm, and the fast AVC substation adopts a reactive power distribution algorithm including an equal reactive power margin algorithm.

[0086] In this embodiment, the reactive power allocation algorithm of the AVC coordination substation and the fast AVC substation is confirmed, and further includes:

[0087] The AVC cooperative control substation decomposes the voltage target value, controls according to the predetermined voltage step, decomposes again, and controls again. Its instruction transmission, analysis, and distribution consume time. The time parameters of each link of the AVC cooperative control substation must follow the set size relationship;

[0088] Among them, the voltage target value issuance cycle is longer than the voltage closed-loop control time, the voltage closed-loop control time is longer than the sum of the flight time of the total reactive power command and the reactive closed-loop control cycle, and the reactive closed-loop control cycle is longer than the sum of the station reactive power calculation and command decomposition, the flight time of the station reactive power command, and the response time of the station reactive power command.

[0089] As a preferred embodiment of the above, the reactive resources are classified, including:

[0090] The multi-time-sequence reactive resources of wind farms are classified according to their response speed. The reactive resources with a response speed of hundreds of milliseconds are classified into Class A, which participate in steady-state rapid dispatch and emergency dispatch of reactive power. The remaining reactive resources with slow response speeds are classified into Class B, which participate in steady-state replacement control and emergency dispatch of reactive power.

[0091] Among them, the voltage control action strategy includes:

[0092] The AVC cooperative control substation adopts a two-level voltage control algorithm. The control objects and control cycles of the two-level voltage control include:

[0093] The primary voltage control is closed-loop for the target voltage value of the master station, and the secondary voltage control is closed-loop for the voltage regulation step. The control period of the primary voltage control is much longer than that of the secondary voltage control.

[0094] Among them, the secondary voltage control can only be started when there is a margin of Class A reactive resources; both levels of voltage control algorithms take the reactive step size into consideration and are subject to the upper and lower limits of the station reactive reference.

[0095] The voltage control action strategy also includes:

[0096] When the fast AVC substation receives control instructions from the AVC co-control substation, it performs fast control with Class A reactive resources as the priority control object. When Class A reactive resources are insufficient, Class B reactive resources are called upon. The reactive adjustment step of the fast AVC substation must be smaller than that of the AVC co-control substation, and the adjustment range is constrained by the upper and lower limits of the station reactive reference.

[0097] In this embodiment, the voltage control action strategy also includes:

[0098] When the following conditions occur, use Class B reactive resources to replace Class A reactive resources:

[0099] The AVC co-control substation has no action;

[0100] The Class A reactive resources of the station have output;

[0101] The station has sufficient Class B reactive resources.

[0102] Two-level voltage control algorithm When new energy is centrally connected to the substation, it also includes the following steps:

[0103] When the bus voltage is within the upper reverse pull limit, the reactive power increase will not be blocked;

[0104] When the bus voltage is within the upper reverse pull limit, it responds normally to the dispatching master station command;

[0105] When the bus voltage is outside the upper reverse pull limit, the reactive power is increased;

[0106] When the bus voltage is outside the upper reverse pull limit, the reverse pull control strategy is started, and the bus voltage is adjusted back to within the dead zone range of the voltage target value of the dispatching master station.

[0107] like Figure 2 As shown, this embodiment also includes a wind power cluster multi-station coordinated adaptive voltage control device, using the above method, the device includes:

[0108] The architecture building unit is used to build a three-layer coordinated voltage control architecture of wind power cluster AVC master station-AVC coordination substation-fast AVC substation, establish hierarchical control function requirements and high-speed communication between layers;

[0109] A distribution algorithm unit, used to confirm the reactive power distribution algorithm of the AVC coordination substation and the fast AVC substation;

[0110] A resource classification unit is used to classify reactive resources based on response speed and determine the main participants in reactive steady-state replacement control and emergency dispatch;

[0111] The control strategy unit is used to design voltage control action strategies based on reactive power distribution algorithms, steady-state replacement control and emergency dispatch, and to achieve coordinated adaptive voltage control of multiple stations.

[0112] Embodiment 2:

[0113] like Figure 3 As shown, the specific implementation process is to first establish a three-layer coordinated voltage architecture of a wind power cluster as the application basis of the control method, a wind power cluster multi-station coordinated adaptive voltage control method, including:

[0114] A three-layer coordinated voltage control architecture for wind power clusters is established to define the hierarchical control function requirements and high-speed and reliable communication between layers. The reactive power distribution algorithm for AVC coordination substations and fast AVC substations is confirmed based on the field source conditions. Reactive power resources are classified based on the response speed, and the voltage control substation action strategy is designed to build a two-level voltage control system to realize the adaptive voltage control function of multiple stations.

[0115] A three-layer coordinated voltage control architecture of AVC master station-AVC coordination substation-fast AVC substation was established, and the control method was implemented with the added AVC coordination substation as the key control level. The process is as follows: the voltage control point is placed on the bus voltage side of the substation connected to the wind farm. According to the changes in the regional power flow, the AVC master station calculates the bus voltage target value of each substation and sends it to the AVC coordination substation. The AVC coordination substation calculates the reactive power target value based on the voltage target value sent by the master station and transmits it to the fast AVC substation. Finally, various reactive resources in multiple stations are controlled to respond to the increase or decrease of reactive power operations.

[0116] Each layer of the three-layer coordinated voltage control architecture must have corresponding clear control functions, and the communication between each layer must have low latency and high reliability. The specific conditions are as follows:

[0117] (1) The AVC master station has the ability to calculate the power flow of layers and zones and identify the operation mode, and can formulate dynamic substation bus voltage control targets according to the power flow changes of the regional power grid;

[0118] (2) AVC master station and AVC cooperative control substation establish a reliable communication network;

[0119] (3) AVC cooperative control substation establishes a reliable communication network with each wind farm fast AVC substation;

[0120] (4) A complete fast AVC substation system that meets regional grid regulations is deployed within the wind farm;

[0121] (5) The AVC master station can establish a preset point table with the AVC cooperative control substation;

[0122] (6) The AVC cooperative control substation establishes a preset point table with each wind farm fast AVC substation;

[0123] (7) Each wind farm has available reactive power resources;

[0124] (8) AVC cooperative control substation has the function of substation bus voltage control;

[0125] (9) The fast AVC substation has the function of on-site reactive power control within the station.

[0126] The substation reactive power allocation algorithm is selected according to the reactive power resources and device conditions of the wind farm. In view of the uneven distribution of reactive power resources, the AVC coordination substation adopts the equal reactive power margin algorithm, and the fast AVC substation can choose the equal reactive power margin or other algorithms.

[0127] The AVC cooperative control substation decomposes the voltage target value, controls according to the predetermined voltage step, decomposes again, and controls again. Its command transmission, analysis and distribution consume time, and the time parameters of each link must strictly follow the set size relationship. Among them, the main station voltage target value issuance cycle is greater than the voltage closed-loop control time, the voltage closed-loop control time is greater than the sum of the flight time of the total reactive power command and the reactive closed-loop control cycle, and the reactive closed-loop control cycle is greater than the sum of the reactive power calculation and command decomposition of the station, the flight time of the reactive power command of the station, and the response time of the reactive power command of the station. The various time parameters are shown in Table 1.

[0128] Table 1

[0129]

[0130]

[0131] The method needs to classify the multi-time-sequence reactive resources of wind farms according to their response speed. The reactive resources with a response speed of hundreds of milliseconds are divided into Class A, which mainly participates in steady-state rapid dispatch and emergency dispatch of reactive power. The remaining reactive resources with slower response speeds are divided into Class B, which mainly participates in steady-state replacement control and emergency dispatch of reactive power.

[0132] The control strategy of the AVC coordination substation is as follows: The AVC coordination substation adopts a two-level voltage control algorithm. The control objects and control cycles of the two-level voltage control are different. The first-level voltage control is closed-loop for the voltage target value of the main station, and the control cycle is 30s. The second-level voltage control is closed-loop for the voltage adjustment step, and the control cycle is 0.25s. Among them, the second-level voltage control can only be started when there is a margin of Class A reactive resources. Both algorithms consider the reactive step size and are constrained by the upper and lower limits of the reactive reference of the station.

[0133] When the fast AVC substation receives control instructions from the AVC co-control substation, it performs fast control with Class A reactive resources as the priority control object. When Class A reactive resources are insufficient, Class B reactive resources are called upon. The reactive adjustment step of the fast AVC substation must be smaller than that of the AVC co-control substation, and the adjustment range is constrained by the upper and lower limits of the station reactive reference.

[0134] Class A reactive resources can be replaced by Class B reactive resources when certain conditions are met. The conditions are as follows:

[0135] (1) The AVC cooperative control substation has no action; (2) The Class A reactive resources of the station have output; (3) The Class B reactive resources of the station have margin.

[0136] The AVC cooperative control substation has a fast-response voltage reverse pull capability. Since the secondary voltage control cycle is extremely short, it can quickly adjust and control when the voltage value exceeds the action dead zone, greatly reducing the possibility of the bus voltage exceeding the reverse pull limit. Its specific action strategy is as follows:

[0137] (1) When the bus voltage of the substation with centralized access to new energy is within the upper reverse pull limit, the reactive power increase will not be blocked;

[0138] (2) When the bus voltage of the substation with centralized access to new energy is within the upper reverse pull limit, it responds normally to the instructions of the dispatching master station;

[0139] (3) When the bus voltage of the substation where new energy is centrally connected is outside the upper reverse pull limit, the reactive power is increased;

[0140] (4) When the bus voltage of the substation where new energy is centrally connected is outside the upper reverse pull limit, the reverse pull control strategy is activated, and the substation is obliged to adjust the bus voltage back to within the dead zone of the voltage target value of the dispatching master station.

[0141] like Figure 4 As shown in the figure, the three-layer coordinated control architecture of the wind power cluster is composed of the AVC master station that issues voltage dispatching instructions, the AVC coordination substation that receives the master station command to perform voltage decomposition and calculates and issues reactive power target instructions, and the fast AVC substation that receives the reactive power instructions of the AVC coordination substation and controls the action of reactive resources. Among them, the AVC coordination substation realizes local closed-loop control with the voltage value as the target, and the fast AVC substation realizes local closed-loop control with the reactive value as the target.

[0142] like Figure 5 As shown in the figure, when the Class A reactive resource margin is sufficient, the AVC coordinated substation control algorithm is a coordinated control of two-level voltages. In the figure, Dz is the voltage control dead zone, Step is the voltage adjustment step, and tc1 and tc2 are the control cycles of the primary voltage control and the secondary voltage control, respectively. Due to the existence of controllable Class A reactive resources with fast response speed, the fast AVC substation will quickly adjust the voltage upward by a voltage step after tc2 after receiving the instruction, and stabilize it within the voltage control dead zone, waiting for the end of the primary voltage control cycle before adjusting again until the target voltage value is reached, that is, the voltage control action is completed.

[0143] like Figure 6 As shown in the figure, when the margin of Class A reactive power resources is insufficient, Class B resources need to be called to compensate for the reactive power shortage. At this time, the AVC coordinated substation control algorithm only adopts primary voltage control, which is no different from the action rule of general AVC substations. It takes a long time to complete the stage voltage rise in a voltage control cycle.

[0144] like Figure 7 As shown in the figure, whether the Class A reactive resource margin is sufficient determines the speed of the device voltage reverse pull action when the bus voltage exceeds the limit. In the figure, tm is the time interval of the wind farm bus voltage fast step, tc1 and tc2 are the control cycles of the primary voltage control and the secondary voltage control respectively, Dz is the voltage control dead zone, and dU is the voltage callback voltage difference caused by the reverse reactive step. If the Class A reactive resource is sufficient, when the bus voltage exceeds the limit, the substation will perform a rapid voltage reverse pull action in the next secondary voltage control cycle, and pull the voltage back to the voltage reverse pull limit in a very short time, such as Figure 7 (a); if the Class A reactive resources are insufficient, the substation will complete a relatively slow voltage pull-back action in the next primary voltage control cycle, such as Figure 7 (b) as shown.

[0145] See also Figure 8A computer device 400 provided in an embodiment of the present application includes: a processor 410 and a memory 420, wherein the memory 420 stores a computer program executable by the processor 410, and when the computer program is executed by the processor 410, the above method is executed.

[0146] The embodiment of the present application further provides a storage medium 430 on which a computer program is stored. When the computer program is run by the processor 410, the above method is executed.

[0147] Among them, the storage medium 430 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable red-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, disk or optical disk.

[0148] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0149] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0150] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0151] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention belong.

[0152] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic devices), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0153] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0154] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0155] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A wind power cluster multi-station coordinated adaptive voltage control method, characterized in that: The steps include: Construct a three-layer coordinated voltage control architecture of wind power cluster AVC master station-AVC coordination substation-fast AVC substation, and establish hierarchical control function requirements and high-speed communication between layers; Confirm the reactive power distribution algorithm of AVC coordination substation and fast AVC substation; Based on the response speed, reactive resources are classified to determine the main participants in the steady-state replacement control and emergency dispatch of reactive power; According to the reactive power distribution algorithm, steady-state replacement control and emergency dispatch, a voltage control action strategy is designed to achieve coordinated adaptive voltage control of multiple stations.

2. The wind power cluster multi-station coordinated adaptive voltage control method according to claim 1 is characterized in that: In the three-layer coordinated voltage control architecture, the AVC coordination substation is used as the key control layer, including: The voltage control point is placed on the bus voltage side of the substation to which the wind farm is connected; According to the changes in regional power flow, the AVC master station calculates the bus voltage target value of each substation and sends it to the AVC coordination substation. The AVC coordination substation calculates the reactive power target value based on the voltage target value and transmits it to the fast AVC substation to respond to the increase or decrease of reactive power operations for various reactive resources in multiple stations.

3. The wind power cluster multi-station coordinated adaptive voltage control method according to claim 2 is characterized in that: The establishment of hierarchical control function requirements and high-speed communication between layers includes: The AVC master station has the ability to calculate the power flow of layers and partitions and identify the operation mode, and can formulate dynamic substation bus voltage control targets according to the power flow changes of the regional power grid; Establish a high-speed and reliable communication network between the AVC master station and the AVC cooperative control substation; Establish a high-speed and reliable communication network between the AVC cooperative control substation and each wind farm fast AVC substation; Deploy a complete fast AVC substation system in the wind farm that meets the regional grid regulations; The AVC master station can establish a preset point table with the AVC co-control substation; The AVC cooperative control substation establishes a preset point table with each wind farm fast AVC substation; Each wind farm has available reactive resources; The AVC cooperative control substation has the function of substation bus voltage control; The fast AVC substation has the function of reactive power control on-site.

4. The wind power cluster multi-station coordinated adaptive voltage control method according to claim 2 is characterized in that: The reactive power allocation algorithm for confirming the AVC coordination substation and the fast AVC substation includes: The AVC coordination substation adopts an equal reactive power margin algorithm, and the fast AVC substation adopts a reactive power distribution algorithm including an equal reactive power margin algorithm.

5. The wind power cluster multi-station coordinated adaptive voltage control method according to claim 4 is characterized in that: The reactive power distribution algorithm for confirming the AVC coordination substation and the fast AVC substation also includes: The AVC cooperative control substation decomposes the voltage target value, controls according to the predetermined voltage step, decomposes again, and controls again. The instruction transmission, analysis and distribution consume time. The time parameters of each link of the AVC cooperative control substation must follow the set size relationship; Among them, the voltage target value issuance cycle is greater than the voltage closed-loop control time, the voltage closed-loop control time is greater than the sum of the flight time of the total reactive power command and the reactive closed-loop control cycle, and the reactive closed-loop control cycle is greater than the sum of the station reactive power calculation and command decomposition, the flight time of the station reactive power command, and the response time of the station reactive power command.

6. The wind power cluster multi-station coordinated adaptive voltage control method according to claim 2 is characterized in that: The classification of reactive resources includes: The multi-time-sequence reactive resources of wind farms are classified according to their response speed. The reactive resources with a response speed of hundreds of milliseconds are classified into Class A, which participate in steady-state rapid dispatch and emergency dispatch of reactive power. The remaining reactive resources with slow response speeds are classified into Class B, which participate in steady-state replacement control and emergency dispatch of reactive power.

7. The wind power cluster multi-station coordinated adaptive voltage control method according to claim 6 is characterized in that: The voltage control action strategy includes: The AVC cooperative control substation adopts a two-level voltage control algorithm. The control objects and control cycles of the two-level voltage control include: The primary voltage control is closed-loop for the target voltage value of the master station, and the secondary voltage control is closed-loop for the voltage regulation step. The control period of the primary voltage control is much longer than that of the secondary voltage control. Among them, the secondary voltage control can only be started when there is a margin of Class A reactive resources; both levels of voltage control algorithms take the reactive step size into consideration and are subject to the upper and lower limits of the station reactive reference.

8. The wind power cluster multi-station coordinated adaptive voltage control method according to claim 7 is characterized in that: The voltage control action strategy also includes: When the fast AVC substation receives control instructions from the AVC co-control substation, it performs fast control with Class A reactive resources as the priority control object. When Class A reactive resources are insufficient, Class B reactive resources are called upon. The reactive adjustment step of the fast AVC substation must be smaller than that of the AVC co-control substation, and the adjustment range is constrained by the upper and lower limits of the station reactive reference.

9. The wind power cluster multi-station coordinated adaptive voltage control method according to claim 8, characterized in that: The voltage control action strategy also includes: When the following conditions occur, use Class B reactive resources to replace Class A reactive resources: The AVC co-control substation has no action; The Class A reactive resources of the station have output; The station has sufficient Class B reactive resources.

10. The wind power cluster multi-station coordinated adaptive voltage control method according to claim 7, characterized in that: When the new energy is centrally connected to the substation, the two-level voltage control algorithm also includes the following steps: When the bus voltage is within the upper reverse pull limit, the reactive power increase will not be blocked; When the bus voltage is within the upper reverse pull limit, it responds normally to the dispatching master station command; When the bus voltage is outside the upper reverse pull limit, the reactive power is increased; When the bus voltage is outside the upper reverse pull limit, the reverse pull control strategy is started, and the bus voltage is adjusted back to within the dead zone range of the voltage target value of the dispatching master station.

11. A wind power cluster multi-station coordinated adaptive voltage control device, characterized in that: Using the method according to any one of claims 1 to 10, the device comprises: The architecture building unit is used to build a three-layer coordinated voltage control architecture of wind power cluster AVC master station-AVC coordination substation-fast AVC substation, establish hierarchical control function requirements and high-speed communication between layers; A distribution algorithm unit, used to confirm the reactive power distribution algorithm of the AVC coordination substation and the fast AVC substation; A resource classification unit is used to classify reactive resources based on response speed and determine the main participants in reactive steady-state replacement control and emergency dispatch; The control strategy unit is used to design a voltage control action strategy according to the reactive power distribution algorithm, steady-state replacement control and emergency dispatch, so as to realize coordinated adaptive voltage control of multiple stations.

12. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 10 is implemented.

13. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 10 is implemented.

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