Transformer area power distribution network voltage regulation method, device, equipment and medium in photovoltaic access scene

Abstract

The invention belongs to the technical field of power system automation, and particularly relates to a transformer area power distribution network voltage regulation method, device and equipment in a photovoltaic access scene and a medium. The method comprises the following steps: firstly, determining a topological structure of a transformer area power distribution network, and installing electric energy quality treatment equipment and a flexible voltage regulation device at key nodes; and clustering the distributed photovoltaics by using a clustering algorithm, and determining the adjustment priority of each photovoltaic according to a clustering result. And then, according to the voltage condition of the transformer area side, the corresponding photovoltaic power is controlled in combination with the distributed photovoltaic regulation priority, and the flexible voltage regulation device and / or the electric energy quality treatment equipment are / is regulated, so that the voltage stability is realized. According to the method, the flexibility and the accuracy of voltage regulation are improved, the distributed photovoltaic regulation strategy is optimized, the reliability and the stability of the transformer area power distribution network are enhanced, and technical support is provided for energy transformation and industrial upgrading.

Description

Technical Field

[0001] The present invention belongs to the technical field of power system automation, and specifically relates to a method, device, equipment and medium for voltage regulation of a distribution network in a photovoltaic access scenario. Background Art

[0002] The high proportion of new energy access to the distribution network leads to an increase in voltage fluctuations and disturbance factors. The voltage disturbance caused by the high proportion of renewable energy access to the distribution network has become a key basic problem to be solved in the process of energy transformation and industrial upgrading. For example, random and volatile sources and loads such as high proportions of distributed renewable energy and large-scale electric vehicle clusters are connected to the distribution network. The operation mode of the distribution network is more variable and the dynamic process is more complex. Its voltage fluctuations also show randomness, rapidity and wide range characteristics. The existing distribution network on-load voltage regulation equipment faces new demands and challenges. Summary of the invention

[0003] The purpose of the present invention is to provide a method, device, equipment and medium for regulating the voltage of a distribution network in a photovoltaic access scenario, so as to solve the voltage fluctuation and disturbance problems caused by the high proportion of new energy access to the distribution network in the prior art.

[0004] In order to achieve the above object, the present invention adopts the following technical solution: In a first aspect, the present invention provides a method for regulating voltage of a distribution network in a photovoltaic access scenario, comprising the following steps: Determine the topological structure of the distribution network in the substation area, and determine each node according to the topological structure; wherein a power quality management device is installed at the node whose comprehensive voltage sensitivity meets the preset standard, and a flexible voltage regulating device is installed on the substation side; Based on preset indicators, a clustering algorithm is used to cluster the distributed photovoltaics, and a regulation priority of each distributed photovoltaic is determined according to the clustering result; Determine the voltage condition on the substation side, and adjust the voltage according to the voltage condition on the substation side; wherein the voltage regulation includes controlling the power of the corresponding distributed photovoltaic according to the regulation priority, and controlling the flexible voltage regulation device and / or the power quality management equipment to adjust the voltage.

[0005] Further, in the step of installing a power quality management device at a node whose comprehensive voltage sensitivity meets a preset standard, the comprehensive voltage sensitivity of the node is determined as follows: Obtain a pre-built distribution network simulation model for the substation area; in the distribution network simulation model for the substation area, inject disturbance power into the node to obtain the node voltage change and the node power change; The comprehensive voltage sensitivity of the node is calculated based on the node voltage change and the node power change.

[0006] Furthermore, the comprehensive voltage sensitivity of the node is calculated according to the node voltage change and the node power change, including:

[0007] in, k Representation Node i The comprehensive voltage sensitivity of V ri , Δ V im Respectively represent nodes i The change in the real and imaginary parts of the voltage; Δ P i , Δ Q i Respectively represent the injection nodes i The change in active power and reactive power.

[0008] Furthermore, based on preset indicators, a clustering algorithm is used to cluster the distributed photovoltaics, and the regulation priority of each distributed photovoltaic is determined according to the clustering result, including: Determine preset indicators for clustering, including user cooperation and adjustable influence range; Obtain relevant data on distributed photovoltaics, including user cooperation data and adjustable impact range data; Construct a feature vector for each distributed photovoltaic according to the preset indicators; Determine the number of cluster centers; Calculate the distance and assign samples: for each distributed photovoltaic feature vector, calculate its Euclidean distance with each cluster center; assign the distributed photovoltaic to the cluster to which the cluster center closest to it belongs; recalculate the cluster center of each cluster, and repeat the steps of calculating the distance and assigning samples until the cluster center meets the preset conditions; According to the clustering results, a regulation priority is assigned to each distributed photovoltaic.

[0009] Furthermore, according to the clustering results, a regulation priority is assigned to each distributed photovoltaic, including: For each cluster, calculate the average of the user cooperation data and adjustable influence range data of all distributed photovoltaics within it as the index data of the cluster; score the index data of each cluster according to the preset scoring rules to obtain the score of each cluster; sort the clusters from high to low according to their scores to determine the priority of each cluster; Within each cluster, score each distributed photovoltaic power plant according to the user cooperation data and adjustable influence range data according to the set scoring rules to obtain the score of each photovoltaic power plant; sort each photovoltaic power plant from high to low according to the score to determine the priority of each photovoltaic power plant in the cluster; According to the priority of clusters and the priority of PV within clusters, a total priority ranking table is formed.

[0010] Furthermore, according to the regulation priority corresponding to the distributed photovoltaic, the regulation power of the corresponding distributed photovoltaic is controlled, including: When the voltage is high on the substation side, the grid-connected power of the distributed photovoltaics with a higher adjustment priority will be lowered or disconnected, and the grid-connected power of the distributed photovoltaics with a lower adjustment priority will be lowered; the grid-connected power adjustment value of the distributed photovoltaics with a lower adjustment priority will be smaller than that of the distributed photovoltaics with a higher adjustment priority.

[0011] Furthermore, based on the comprehensive voltage sensitivity of the substation side and the user load side, the corresponding flexible voltage regulating device and / or power quality management equipment is controlled to perform voltage regulation, including: When the voltage is high on the substation side, the flexible voltage regulator outputs a continuous, reverse voltage waveform; When the voltage on the station side is low, the flexible voltage regulator will output a positive compensation voltage; During the voltage regulation process, the power quality management equipment cooperates with the flexible voltage regulation device to regulate the voltage.

[0012] In a second aspect, the present invention provides a voltage regulating device for a distribution network in a photovoltaic access scenario, comprising: A topology identification module is used to determine the topology of the distribution network in the substation area, and to determine each node according to the topology; wherein a power quality management device is installed at the node whose comprehensive voltage sensitivity meets the preset standard, and a flexible voltage regulating device is installed on the substation side; A clustering module, used to cluster the distributed photovoltaics using a clustering algorithm based on preset indicators, and determine the regulation priority of each distributed photovoltaic according to the clustering result; The control module is used to determine the voltage condition on the substation side and adjust the voltage according to the voltage condition on the substation side; wherein the voltage regulation includes controlling the power of the corresponding distributed photovoltaic according to the regulation priority, and controlling the flexible voltage regulation device and / or the power quality management equipment to adjust the voltage.

[0013] According to a third aspect of the present invention, an electronic device is provided, comprising a processor and a memory, wherein the processor is configured to execute a computer program stored in the memory to implement the method for voltage regulation of a distribution network in a substation in a photovoltaic access scenario as described above.

[0014] According to a fourth aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores at least one instruction, and when the at least one instruction is executed by a processor, the method for voltage regulation of a distribution network in a substation under the photovoltaic access scenario described above is implemented.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention proposes a method for regulating the voltage of a distribution network in a substation under a photovoltaic access scenario. According to the actual situation of the distribution network in the substation, its topological structure is determined and each node is identified; power quality management equipment is installed at the node where the comprehensive voltage sensitivity meets the preset standard; and a flexible voltage regulating device is installed on the substation side to achieve flexible voltage regulation. Based on the preset index, a clustering algorithm is used to cluster distributed photovoltaics. According to the clustering results, a regulation priority is assigned to each distributed photovoltaic, and the power of the corresponding distributed photovoltaic is controlled according to the voltage situation on the substation side and the regulation priority of the distributed photovoltaic. The flexible voltage regulating device and / or the power quality management device are controlled to regulate the voltage to achieve voltage stability. This scheme effectively solves the voltage fluctuation and disturbance problems caused by the high proportion of new energy access to the distribution network by installing a flexible voltage regulating device and a power quality management device, adopting a clustering algorithm and a priority allocation strategy, and formulating a reasonable voltage regulation strategy, thereby improving the reliability and stability of the distribution network in the substation. A substation distribution network voltage regulating device, an electronic device and a computer-readable storage medium provided by the present invention under a photovoltaic access scenario also solve the problems raised in the background technology section.

[0016] By obtaining the distribution network simulation model of the substation, the disturbance power is injected into the node to obtain the node voltage change and node power change. According to the node voltage change and node power change, the comprehensive voltage sensitivity of the node is calculated to evaluate the sensitivity of the node to voltage change.

[0017] A clustering algorithm is used to cluster distributed photovoltaics, and a feature vector is constructed based on preset indicators such as user cooperation and adjustable influence range, and the cluster center is calculated. Based on the clustering results and preset scoring rules, an adjustment priority is assigned to each distributed photovoltaic.

[0018] When the voltage is high on the substation side, the grid-connected power of the distributed photovoltaic with the highest regulation priority will be reduced or disconnected. At the same time, the flexible voltage regulator will output a continuous, reverse voltage waveform to reduce the voltage. When the voltage is low on the substation side, the flexible voltage regulator will output a positive compensation voltage to increase the voltage. During the entire voltage regulation process, the power quality management equipment cooperates with the flexible voltage regulator to jointly regulate the voltage to ensure voltage stability and power quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 This is a flow chart of a method for regulating voltage of a distribution network in a photovoltaic access scenario according to an embodiment of the present invention; Figure 2A schematic diagram of a distributed photovoltaic regulation sequence in an embodiment of the present invention; Figure 3 A topological diagram of a flexible voltage regulating device in an embodiment of the present invention; Figure 4 This is a structural block diagram of a distribution network voltage regulating device in a photovoltaic access scenario according to an embodiment of the present invention; Figure 5 The present invention is a structural block diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0021] The following detailed description is an exemplary description, which is intended to provide further detailed description of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit exemplary embodiments according to the present invention.

[0022] Example 1 An embodiment of the present invention provides a method for voltage regulation of a distribution network in a substation under a photovoltaic access scenario, in which the flexible voltage regulation scheme is optimized, the power quality management equipment and the flexible voltage regulation device layout scheme are optimized, and then the adjustable photovoltaic resources within the substation are clustered and analyzed to obtain a control priority; if the high voltage problem in the substation is serious, during the control process, the photovoltaics are first adjusted in sequence to avoid the impact of photovoltaics on the high voltage problem in the substation as much as possible, and in addition to the photovoltaic adjustable resources, the power quality management equipment and the flexible voltage regulation device are used for compensation; if there is a low voltage problem in the substation, the power quality management equipment and the flexible voltage regulation device are used to inject a compensation voltage to solve the low voltage problem in the substation.

[0023] like Figure 1 As shown, a method for regulating the voltage of a distribution network in a photovoltaic access scenario includes the following steps: S1. Determine the topological structure of the distribution network in the substation area, and determine each node according to the topological structure; wherein, power quality management equipment is installed at the node where the comprehensive voltage sensitivity meets the preset standard, and a flexible voltage regulating device is installed on the substation side.

[0024] like Figure 3 As shown, the main structure of the flexible voltage regulating device is a back-to-back converter structure, which is divided into a series module and a parallel module. The series module mainly outputs a forward or reverse compensation voltage through a series transformer, that is: The parallel module mainly absorbs the power from the AC side to maintain the DC bus voltage constant. It can also compensate for reactive power or current harmonics to improve the power quality in the current field.

[0025] In step S1, the comprehensive voltage sensitivity of the node is determined in the following manner: a pre-constructed substation distribution network simulation model is obtained; in the substation distribution network simulation model, a disturbance power is injected into the node to obtain the node voltage change and the node power change; and the comprehensive voltage sensitivity of the node is calculated based on the node voltage change and the node power change.

[0026] More specifically, the comprehensive voltage sensitivity of the node is calculated according to the node voltage change and the node power change, including:

[0027] in, k Representation Node i The comprehensive voltage sensitivity of V ri , Δ V im Respectively represent nodes i The change in the real and imaginary parts of the voltage; Δ P i , Δ Q i Respectively represent the injection nodes i The change in active power and reactive power.

[0028] It should be noted that the flexible voltage regulating device in the substation can output a continuous voltage waveform; the power quality management equipment cooperates with the flexible voltage regulating device in the substation to improve power quality problems such as voltage and three-phase imbalance on the load side of the substation.

[0029] In an optional embodiment, the voltage sensitivity of each node may also be calculated as follows: Define voltage sensitivity as the node voltage change Δ V and the injected power variation (active power Δ P or reactive power Δ Q ), the approximate value in the limiting case is:

[0030] in, S V,Pi Representation Node i Voltage to active power P i The sensitivity of S V,Qi Representation Node i Voltage to reactive power Q isensitivity.

[0031] For containing n For a system with 4 nodes, except the balancing node, each node has a corresponding voltage sensitivity value.

[0032] Therefore, this scheme can construct two sensitivity sub-matrices: Active power-voltage sensitivity matrix , whose dimension is ( n −1)×( n −1), the elements in the matrix (when i ≠ j When is the mutual sensitivity, i = j When it indicates self-sensitivity) it indicates the node j When the active power of the node changes i The ratio of the voltage change to this change.

[0033] Reactive-voltage sensitivity matrix , whose dimension is ( n −1)×( n −1), the elements in the matrix Representation Node j When the reactive power of the node changes i The ratio of the voltage change to this change.

[0034] Based on the above information, the calculation formula for voltage sensitivity (expressed in matrix form) is as follows:

[0035] The two matrices represent the sensitivity of all unbalanced node voltages in the system to changes in active power and reactive power, respectively.

[0036] The sensitivity of voltage to changes in active power and reactive power is multiplied by the corresponding weights and then summed to obtain the comprehensive sensitivity.

[0037] S2. Based on preset indicators, a clustering algorithm is used to cluster the distributed photovoltaics, and the regulation priority of each distributed photovoltaic is determined according to the clustering result.

[0038] Step S2 specifically includes: determining preset indicators for clustering, the preset indicators include user cooperation and adjustable influence range; obtaining relevant data of distributed photovoltaics, including user cooperation data and adjustable influence range data; constructing a feature vector for each distributed photovoltaic according to the preset indicators; determining the number of cluster centers; calculating distances and allocating samples: for each distributed photovoltaic feature vector, calculating its Euclidean distance from each cluster center; allocating distributed photovoltaics to the cluster to which the cluster center closest to it belongs; recalculating the cluster center of each cluster, and repeating the steps of calculating distances and allocating samples until the cluster center meets the preset conditions; and according to the clustering results, allocating an adjustment priority to each distributed photovoltaic.

[0039] Specifically, according to the clustering results, a regulation priority is assigned to each distributed photovoltaic, including: for each cluster, the average value of the user cooperation data and adjustable influence range data of all distributed photovoltaics within it is calculated as the index data of the cluster; according to the preset scoring rules, the index data of each cluster is scored to obtain the score of each cluster; according to the scores of the clusters, the priority of each cluster is determined from high to low; within each cluster, according to the user cooperation data and adjustable influence range data of each distributed photovoltaic, the score is scored according to the set scoring rules to obtain the score of each photovoltaic; according to the score of each photovoltaic, the priority of each photovoltaic in the cluster is determined from high to low; according to the priority of the cluster and the priority of the photovoltaic within the cluster, a total priority sorting table is formed. When adjusting the voltage, the cluster with the highest priority is first selected, and then the distributed photovoltaic with the highest priority is selected in the cluster for adjustment. If the voltage still does not meet the requirements after adjustment, the cluster or photovoltaic with the second priority is continuously selected for adjustment until the voltage reaches the requirements.

[0040] In a preferred embodiment, the user's cooperation degree and adjustable influence range may change over time, so the data needs to be updated regularly and the priority needs to be recalculated.

[0041] In an optional embodiment, clustering the distributed photovoltaics using a clustering algorithm based on preset indicators may include the following steps: Determine the preset indicators for clustering, including user cooperation and adjustable influence range; Collect relevant data of distributed photovoltaics, which may include user cooperation data, adjustable impact range data, etc.; pre-process the collected data, such as removing outliers and filling missing values; According to the preset indicators (user cooperation, adjustable influence range), a feature vector is constructed for each distributed photovoltaic. The feature vector can be expressed as: X i =[ x i1, x i2 ],in x i1 Indicates i The cooperation degree of distributed photovoltaic users, x i2 Indicates i The adjustable influence range of distributed photovoltaics; K-means clustering algorithm initialization: Determine the number of clusters K , can be set according to actual conditions or experience. Random selection K Initial cluster centers, denoted as C 1, C 2,..., C K .

[0042] Calculate the distance and assign samples: For each distributed photovoltaic feature vector X i , calculate its relationship with each cluster center C j ( j =1,2,..., K ) is:

[0043] in, c jk Represents the cluster center C j No. k feature values.

[0044] Distributed photovoltaic X i Assign to the cluster center closest to it C j The cluster to which it belongs.

[0045] Recompute the cluster centers for each cluster:

[0046] Among them, ∣ C j ∣ indicates clustering C j The number of distributed photovoltaics in

[0047] The steps of calculating the distance and allocating samples are repeated until the cluster center reaches a preset number of iterations.

[0048] According to the clustering results, a regulation priority is assigned to each cluster. Specifically, distributed photovoltaics with high user cooperation and large adjustable influence range will be given a higher regulation priority.

[0049] S3. Determine the voltage condition on the substation side, and adjust the voltage according to the voltage condition on the substation side; wherein the voltage regulation includes controlling the power of the corresponding distributed photovoltaic according to the regulation priority, and controlling the flexible voltage regulation device and / or the power quality management equipment to perform voltage regulation.

[0050] In step S3, according to the regulation priority corresponding to the distributed photovoltaic, the regulation power of the corresponding distributed photovoltaic is controlled, such as Figure 2 As shown, including: When the voltage is high on the substation side, the grid-connected power of the distributed photovoltaics with a higher adjustment priority will be lowered or disconnected, and the grid-connected power of the distributed photovoltaics with a lower adjustment priority will be lowered; the grid-connected power adjustment value of the distributed photovoltaics with a lower adjustment priority will be smaller than that of the distributed photovoltaics with a higher adjustment priority.

[0051] In step S3, based on the comprehensive voltage sensitivity of the substation side and the user load side, the corresponding flexible voltage regulating device and / or power quality management equipment is controlled to perform voltage regulation, including: When the voltage is high on the substation side, the flexible voltage regulator outputs a continuous, reverse voltage waveform; When the voltage on the station side is low, the flexible voltage regulator will output a positive compensation voltage; During the voltage regulation process, the power quality management equipment cooperates with the flexible voltage regulation device to regulate the voltage.

[0052] In an optional embodiment, when a high voltage problem occurs in the substation, the adjustable photovoltaic resources are controlled and adjusted in turn according to the cluster analysis results. Specifically, the power monitoring module of the photovoltaic module feeds back the power back to the substation gateway-level controller, and then the edge-side gateway-level controller sends instructions to each photovoltaic inverter module for control. For adjustable photovoltaics with high priority, the photovoltaic inverter can be controlled to reduce more grid-connected power or even disconnect the grid-connected power. For adjustable photovoltaics with low priority, the photovoltaic can be controlled to appropriately reduce the grid-connected power.

[0053] In an optional embodiment, when the voltage on the substation side is high, combined with the photovoltaic adjustable resource control in step 3, if the problem cannot be solved, the function of adjusting the voltage by the flexible voltage regulator on the substation side can be used when necessary, that is, the flexible voltage regulator is controlled to output a continuous, reverse voltage waveform to offset the impact of the high voltage, and further optimize and improve the voltage qualification rate. When the voltage on the substation side is low, the flexible voltage regulator can be controlled to output a positive compensation voltage to ensure that the voltage qualification rate of the substation is normal.

[0054] Example 2 like Figure 4 As shown, based on the same inventive concept as the above embodiment, the present invention also provides a distribution network voltage regulating device in a photovoltaic access scenario, including: A topology identification module is used to determine the topology of the distribution network in the substation area, and to determine each node according to the topology; wherein a power quality management device is installed at the node whose comprehensive voltage sensitivity meets the preset standard, and a flexible voltage regulating device is installed on the substation side; A clustering module, used to cluster the distributed photovoltaics using a clustering algorithm based on preset indicators, and determine the regulation priority of each distributed photovoltaic according to the clustering result; The control module is used to determine the voltage condition on the substation side and adjust the voltage according to the voltage condition on the substation side; wherein the voltage regulation includes controlling the power of the corresponding distributed photovoltaic according to the regulation priority, and controlling the flexible voltage regulation device and / or the power quality management equipment to adjust the voltage.

[0055] Example 3 like Figure 5 As shown, the present invention also provides an electronic device 100 for implementing a method for voltage regulation of a distribution network in a photovoltaic access scenario; The electronic device 100 includes a memory 101 , at least one processor 102 , a computer program 103 stored in the memory 101 and executable on the at least one processor 102 , and at least one communication bus 104 .

[0056] The memory 101 can be used to store a computer program 103. The processor 102 implements the steps of a method for voltage regulation of a distribution network in a photovoltaic access scenario in Example 1 by running or executing the computer program stored in the memory 101 and calling the data stored in the memory 101.

[0057] The memory 101 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area may store data (such as audio data) created according to the use of the electronic device 100, etc. In addition, the memory 101 may include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other non-volatile solid-state storage devices.

[0058] At least one processor 102 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor 102 may be a microprocessor or any conventional processor, etc. The processor 102 is the control center of the electronic device 100, and uses various interfaces and lines to connect various parts of the entire electronic device 100.

[0059] The memory 101 in the electronic device 100 stores a plurality of instructions to implement a method for regulating the voltage of a distribution network in a photovoltaic access scenario, and the processor 102 can execute the plurality of instructions to implement: Determine the topological structure of the distribution network in the substation area, and determine each node according to the topological structure; wherein a power quality management device is installed at the node whose comprehensive voltage sensitivity meets the preset standard, and a flexible voltage regulating device is installed on the substation side; Based on preset indicators, a clustering algorithm is used to cluster the distributed photovoltaics, and a regulation priority of each distributed photovoltaic is determined according to the clustering result; Determine the voltage condition on the substation side, and adjust the voltage according to the voltage condition on the substation side; wherein the voltage regulation includes controlling the power of the corresponding distributed photovoltaic according to the regulation priority, and controlling the flexible voltage regulation device and / or the power quality management equipment to adjust the voltage.

[0060] Example 4 If the module / unit integrated in the electronic device 100 is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. Computer-readable media may include: any entity or device that can carry computer program code, recording medium, USB flash drive, mobile hard disk, disk, optical disk, computer memory and read-only memory (ROM, Read-Only Memory).

[0061] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0062] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks 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.

[0063] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0064] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", 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 representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for regulating voltage of distribution network in a photovoltaic access scenario, characterized in that: The steps include: Determine the topological structure of the distribution network in the substation area, and determine each node according to the topological structure; wherein a power quality management device is installed at the node whose comprehensive voltage sensitivity meets the preset standard, and a flexible voltage regulating device is installed on the substation side; Based on the preset indicators, the distributed photovoltaics are clustered using a clustering algorithm, and the adjustment priority of each distributed photovoltaic is determined according to the clustering result; Determine the voltage condition on the substation side, and adjust the voltage according to the voltage condition on the substation side; wherein the voltage regulation includes controlling the power of the corresponding distributed photovoltaic according to the regulation priority, and controlling the flexible voltage regulation device and / or the power quality management equipment to adjust the voltage.

2. The method for voltage regulation of distribution network in photovoltaic access scenario according to claim 1, characterized in that: In the step of installing a power quality control device at a node whose comprehensive voltage sensitivity meets a preset standard, the comprehensive voltage sensitivity of the node is determined as follows: Obtain a pre-built distribution network simulation model for the substation area; in the distribution network simulation model for the substation area, inject disturbance power into the node to obtain the node voltage change and the node power change; The comprehensive voltage sensitivity of the node is calculated based on the node voltage change and the node power change.

3. The method for voltage regulation of distribution network in photovoltaic access scenario according to claim 2, characterized in that: The comprehensive voltage sensitivity of the node is calculated based on the node voltage change and the node power change, including: in, k Representation Node i The comprehensive voltage sensitivity of V ri , Δ V im Respectively represent nodes i The change in the real and imaginary parts of the voltage; Δ P i , Δ Q i Respectively represent the injection nodes i The change in active power and reactive power.

4. The method for voltage regulation of distribution network in photovoltaic access scenario according to claim 1, characterized in that: Based on the preset indicators, a clustering algorithm is used to cluster the distributed photovoltaics, and the regulation priority of each distributed photovoltaic is determined according to the clustering result, including: Determine preset indicators for clustering, including user cooperation and adjustable influence range; Obtain relevant data on distributed photovoltaics, including user cooperation data and adjustable impact range data; Construct a feature vector for each distributed photovoltaic according to the preset indicators; Determine the number of cluster centers; Calculate the distance and assign samples: for each distributed photovoltaic feature vector, calculate its Euclidean distance with each cluster center; assign the distributed photovoltaic to the cluster to which the cluster center closest to it belongs; recalculate the cluster center of each cluster, and repeat the steps of calculating the distance and assigning samples until the cluster center meets the preset conditions; According to the clustering results, a regulation priority is assigned to each distributed photovoltaic.

5. The method for voltage regulation of distribution network in photovoltaic access scenario according to claim 4, characterized in that: According to the clustering results, a regulation priority is assigned to each distributed photovoltaic system, including: For each cluster, calculate the average of the user cooperation data and adjustable influence range data of all distributed photovoltaics within it as the index data of the cluster; score the index data of each cluster according to the preset scoring rules to obtain the score of each cluster; sort the clusters from high to low according to their scores to determine the priority of each cluster; Within each cluster, score each distributed photovoltaic power plant according to the user cooperation data and adjustable influence range data according to the set scoring rules to obtain the score of each photovoltaic power plant; sort each photovoltaic power plant from high to low according to the score to determine the priority of each photovoltaic power plant in the cluster; According to the priority of clusters and the priority of PV within clusters, a total priority ranking table is formed.

6. The method for voltage regulation of distribution network in photovoltaic access scenario according to claim 1, characterized in that: According to the regulation priority of distributed photovoltaics, the regulation power of the corresponding distributed photovoltaics is controlled, including: When the voltage is high on the substation side, the grid-connected power of the distributed photovoltaics with a higher adjustment priority will be lowered or disconnected, and the grid-connected power of the distributed photovoltaics with a lower adjustment priority will be lowered; the grid-connected power adjustment value of the distributed photovoltaics with a lower adjustment priority will be smaller than that of the distributed photovoltaics with a higher adjustment priority.

7. The method for voltage regulation of distribution network in photovoltaic access scenario according to claim 1, characterized in that: Based on the comprehensive voltage sensitivity of the substation side and the user load side, the corresponding flexible voltage regulating device and / or power quality management equipment is controlled to adjust the voltage, including: When the voltage is high on the substation side, the flexible voltage regulator outputs a continuous, reverse voltage waveform; When the voltage on the station side is low, the flexible voltage regulator will output a positive compensation voltage; During the voltage regulation process, the power quality management equipment cooperates with the flexible voltage regulation device to regulate the voltage.

8. A voltage regulating device for a distribution network in a photovoltaic access scenario, characterized in that: include: A topology identification module is used to determine the topology of the distribution network in the substation area, and to determine each node according to the topology; wherein a power quality management device is installed at the node whose comprehensive voltage sensitivity meets the preset standard, and a flexible voltage regulating device is installed on the substation side; A clustering module, used to cluster the distributed photovoltaics using a clustering algorithm based on preset indicators, and determine the regulation priority of each distributed photovoltaic according to the clustering result; The control module is used to determine the voltage condition on the substation side and adjust the voltage according to the voltage condition on the substation side; wherein the voltage regulation includes controlling the power of the corresponding distributed photovoltaic according to the regulation priority, and controlling the flexible voltage regulation device and / or the power quality management equipment to adjust the voltage.

9. An electronic device, characterized in that: It includes a processor and a memory, and the processor is used to execute a computer program stored in the memory to implement the method for voltage regulation of a distribution network in a photovoltaic access scenario according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores at least one instruction, and when the at least one instruction is executed by the processor, the method for voltage regulation of the distribution network in the photovoltaic access scenario according to any one of claims 1 to 7 is implemented.

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