Reactive voltage regulation method of power distribution network and related equipment

Abstract

The invention relates to the technical field of power distribution networks, and discloses a reactive voltage regulation method of a power distribution network and related equipment, and the method comprises the steps: building a voltage prediction model of the power distribution network; acquiring voltage measured values and voltage predicted values of measurement points at different positions of the line; comparing the measured voltage values and the predicted voltage values of the obtained measurement points to obtain error data of the measurement points, analyzing the error data to obtain a predicted deviation value, optimizing the voltage prediction model of the power distribution network based on the predicted deviation value in combination with reactive power regulation, and feeding back optimization results to the measurement points at different positions of the line. According to the reactive voltage regulation method, the distributed power supply and other voltage regulation equipment of the power grid are actively controlled, so that the reactive voltage regulation of the power distribution network is realized, and the voltage out-of-limit problem of the power distribution network is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution network, and in particular to a reactive voltage regulation method and related equipment of a distribution network. Background Art

[0002] Distributed power sources, especially distributed photovoltaic power generation, have developed rapidly in recent years due to their clean and renewable characteristics. However, with the continuous increase in their penetration rate in the distribution network, the structure and operating characteristics of the power grid have changed significantly, bringing new challenges to the safe and stable operation of the distribution network. The voltage over-limit problem is an important aspect of these challenges.

[0003] Photovoltaic power generation systems usually do not have reactive power output capabilities, or their reactive power output capabilities are limited. When the reactive power demand in the distribution network increases, if the reactive power compensation is insufficient, it will cause the voltage to rise or fall, which will lead to voltage over-limit.

[0004] The access of distributed power sources has changed the traditional distribution network structure, making the power flow distribution in the distribution network more complicated. In some cases, such as when the output of photovoltaic power generation exceeds the local load demand, it may cause reverse power flow, which in turn causes voltage over-limit.

[0005] In the existing technology, the voltage of the distribution network can only be monitored in real time. When the voltage exceeds the limit, the real-time monitoring leads to slow processing, which has a negative impact on economic benefits. Therefore, how to avoid the voltage exceeding the limit as much as possible is a technical problem that needs to be solved urgently. Summary of the invention

[0006] In order to overcome the defects of the above-mentioned prior art, the purpose of the present invention is to provide a reactive voltage regulation method and related equipment for a distribution network to solve the technical problem of how to solve the voltage over-limit problem.

[0007] The present invention is achieved through the following technical solutions: In a first aspect, the present invention provides a reactive voltage regulation method for a distribution network, comprising: Establish distribution network voltage prediction model; Obtain the measured voltage values ​​and predicted voltage values ​​at different measurement points on the line; The actual voltage measured value and the voltage prediction value at the measurement point are compared to obtain the measurement point error data. The error data is analyzed to obtain the deviation prediction value. The distribution network voltage prediction model is optimized based on the deviation prediction value combined with reactive power regulation. The optimization result is fed back to the measurement points at different positions of the line to complete the reactive voltage regulation of the distribution network.

[0008] Preferably, the specific process of obtaining the measured voltage values ​​of the measuring points at different positions of the line is as follows: Use voltage measuring devices at different locations to collect voltage and obtain collected values; The collected values ​​are uploaded to the operation dispatch center for analysis via wireless public network or carrier; The measured voltage values ​​at different measuring points of the output line are analyzed through operation scheduling.

[0009] Preferably, the specific process of obtaining the voltage prediction value is as follows: By analyzing the factors affecting the distribution network voltage and solving the distribution network voltage prediction model based on the factors affecting the distribution network voltage, the voltage prediction values ​​of the measuring points at different positions of the line are obtained.

[0010] Furthermore, factors affecting the voltage of the distribution network include three-phase imbalance, distribution capacity, load rate, distributed power source, power supply radius and power factor.

[0011] Furthermore, based on the influencing factors of distribution network voltage, the distribution network voltage prediction model is solved to obtain the voltage prediction values ​​of measuring points at different positions of the line, the main influencing factors of distribution network voltage are analyzed, and a prediction model is constructed. The BP neural network is used to learn the processed training sample set, and the correlation coefficient of the BP neural network is adjusted to establish a distribution network voltage prediction model. The voltage is predicted by the prediction model, the voltage deviation of the distribution network is calculated, and the reactive compensation optimization control strategy is formulated to actively manage and control distributed power sources and other voltage regulation equipment in the power grid.

[0012] Preferably, the error data is analyzed to obtain a deviation prediction value, wherein the deviation prediction value is calculated in real time based on the voltage deviation in the error data analysis, and when the deviation prediction value does not exceed a threshold value, the distribution network voltage prediction model is optimized based on the deviation prediction value, and when the deviation prediction value exceeds the threshold value, the distribution network voltage prediction model is optimized in combination with reactive power regulation.

[0013] Furthermore, when the deviation prediction value exceeds the threshold, the specific process of optimizing the distribution network voltage prediction model in combination with reactive power regulation is as follows: Design a reactive power compensation scheme based on the deviation prediction value, where the reactive power compensation scheme includes SVG reactive power compensation device, photovoltaic distributed power source and multi-means coordinated control; A reactive voltage regulation control model is constructed based on the reactive compensation scheme, and the reactive regulation means are solved in the reactive voltage regulation control model according to the reactive compensation scheme, and the distribution network voltage prediction model is optimized according to the reactive regulation means.

[0014] In a second aspect, the present invention further provides a reactive voltage regulation system for a distribution network, comprising: A prediction model building module is used to build a distribution network voltage prediction model; A data acquisition module is used to obtain the measured voltage values ​​and predicted voltage values ​​of measurement points at different positions of the line; The data processing and adjustment module is used to compare the actual voltage measured value and the voltage prediction value of the measurement point to obtain the measurement point error data, analyze the error data to obtain the deviation prediction value, optimize the distribution network voltage prediction model based on the deviation prediction value combined with reactive power regulation, and feed back the optimization results to the measurement points at different positions of the line to complete the reactive voltage regulation of the distribution network.

[0015] In a third aspect, the present invention further provides a mobile terminal, comprising 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 reactive voltage regulation method for the distribution network as described above is implemented.

[0016] In a fourth aspect, the present invention further provides a computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, it implements the reactive voltage regulation method of the distribution network as described above.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects: The invention provides a reactive voltage regulation method and related equipment for a distribution network, which establishes a voltage prediction model for the distribution network; obtains voltage measured values ​​and voltage prediction values ​​at measurement points at different positions of a line; compares the voltage measured values ​​and voltage prediction values ​​of the obtained measurement points to obtain measurement point error data, analyzes the error data to obtain deviation prediction values, optimizes the distribution network voltage prediction model based on the deviation prediction values ​​combined with reactive regulation, and feeds back the optimization results to measurement points at different positions of the line to complete the reactive voltage regulation of the distribution network, wherein the voltage of the distribution network is mainly affected by factors such as load power, distributed power supply, power factor, etc., so the voltage prediction model of the distribution network can be established by analyzing a set of voltage influencing factors, and the voltage prediction model can be further optimized by using voltage data collected in real time by voltage measurement devices at different positions of the power grid, the voltage of the distribution network is predicted, the voltage deviation of the distribution network is calculated, a reactive compensation optimization control strategy is formulated, and the distributed power supply and other voltage regulating equipment of the power grid are actively controlled, thereby realizing reactive voltage regulation of the distribution network and solving the voltage over-limit problem of the distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a flow chart of a reactive voltage regulation method of a distribution network in an embodiment of the present invention; Figure 2 It is a schematic diagram of the principle structure of a reactive voltage regulation system of a distribution network in an embodiment of the present invention; In the figure: 1-prediction model building module; 2-data acquisition module; 3-data processing and adjustment module. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described 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, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0020] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings: The object of the present invention is to provide a reactive voltage regulation method and related equipment for a distribution network, so as to solve the technical problem of how to solve the voltage over-limit problem.

[0022] Example 1 See also Figure 1 In one embodiment of the present invention, a reactive voltage regulation method for a distribution network is provided, comprising the following steps: Step 1: Establish a distribution network voltage prediction model; Step 2, obtaining the measured voltage values ​​and predicted voltage values ​​at measuring points at different positions of the line; Specifically, the specific process of obtaining the measured voltage values ​​of measuring points at different positions of the line is as follows: Use voltage measuring devices at different locations to collect voltage and obtain collected values; The collected values ​​are uploaded to the operation dispatch center for analysis via wireless public network or carrier; The measured voltage values ​​at different measuring points of the output line are analyzed through operation scheduling.

[0023] Specifically, the specific process of obtaining the voltage prediction value is as follows: By analyzing the factors affecting the distribution network voltage and solving the distribution network voltage prediction model based on the factors affecting the distribution network voltage, the voltage prediction values ​​of the measuring points at different positions of the line are obtained.

[0024] The specific process is as follows: (1) Analyze the main influencing factors of distribution network voltage and pre-process the influencing factor set; (2) Divide the original sample set into a training sample set and a test sample set; (3) Use BP neural network to learn the preprocessed training sample set, adjust the BP neural network coefficients, and establish a distribution network voltage prediction model; (4) The performance of the established distribution network voltage prediction model is tested and analyzed using a test sample set, and the accuracy is calculated.

[0025] Among them, the factors affecting the distribution network voltage include three-phase imbalance, distribution capacity, load rate, distributed power supply, power supply radius and power factor.

[0026] Step 3: Compare the measured voltage value and the predicted voltage value at the measurement point to obtain the measurement point error data, analyze the error data to obtain the deviation prediction value, optimize the distribution network voltage prediction model based on the deviation prediction value combined with reactive power regulation, and feed back the optimization results to the measurement points at different positions of the line to complete the reactive voltage regulation of the distribution network.

[0027] Specifically, the error data is analyzed to obtain a deviation prediction value, wherein the deviation prediction value is calculated in real time according to the voltage deviation in the error data analysis; when the deviation prediction value does not exceed the threshold, the distribution network voltage prediction model is optimized according to the deviation prediction value; when the deviation prediction value exceeds the threshold, the distribution network voltage prediction model is optimized in combination with reactive power regulation.

[0028] Among them, when the deviation prediction value exceeds the threshold, the specific process of optimizing the distribution network voltage prediction model in combination with reactive power regulation is as follows: Design a reactive power compensation scheme based on the deviation prediction value, where the reactive power compensation scheme includes SVG reactive power compensation device, photovoltaic distributed power source and multi-means coordinated control; A reactive voltage regulation control model is constructed based on the reactive compensation scheme, and the reactive regulation means are solved in the reactive voltage regulation control model according to the reactive compensation scheme, and the distribution network voltage prediction model is optimized according to the reactive regulation means.

[0029] The specific process of reactive power regulation is as follows: Analyze the situation in which energy storage or reactive power compensation devices support one new energy node or a single energy storage or reactive power compensation device supports multiple new energy nodes in the actual power grid. For example, where the photovoltaic system is concentrated on the 10kV distribution network, a primary and secondary integrated intelligent pole-mounted switch is generally installed, which can collect and transmit data, control the 0.4kV low-voltage photovoltaic inverter for voltage regulation, analyze the energy router on the line, the distribution location of the autocoupler voltage regulator installed on the traditional line, and the reactive power compensation device installed in the substation, the distributed reactive power compensation device installed on the 10kV line, formulate a coordinated voltage regulation control plan, actively control the distributed power source and other voltage regulation equipment of the power grid, and realize the reactive voltage regulation of the distribution network.

[0030] In summary, the present invention provides a reactive voltage regulation method and related equipment for a distribution network, by establishing a distribution network voltage prediction model; obtaining voltage measured values ​​and voltage prediction values ​​at measurement points at different positions of the line; comparing the voltage measured values ​​and voltage prediction values ​​of the obtained measurement points to obtain measurement point error data, analyzing the error data to obtain deviation prediction values, optimizing the distribution network voltage prediction model based on the deviation prediction values ​​combined with reactive regulation, and feeding back the optimization results to measurement points at different positions of the line to complete the reactive voltage regulation of the distribution network, wherein the distribution network voltage is mainly affected by factors such as load power, distributed power supply, and power factor, so the distribution network voltage prediction model can be established by analyzing a set of voltage influencing factors, and the voltage prediction model can be further optimized by using voltage data collected in real time by voltage measurement devices at different positions of the power grid, the distribution network voltage is predicted, the voltage deviation of the distribution network is calculated, a reactive compensation optimization control strategy is formulated, and distributed power supplies and other voltage regulating equipment of the power grid are actively managed and controlled, thereby realizing reactive voltage regulation of the distribution network and solving the voltage over-limit problem of the distribution network.

[0031] Example 2 according to Figure 2 As shown, this embodiment also provides a reactive voltage regulation system for a distribution network, including: Prediction model building module 1, used to build a distribution network voltage prediction model; Data acquisition module 2, used to obtain the measured voltage value and the predicted voltage value of the measurement points at different positions of the line; The data processing and adjustment module 3 is used to compare the actual voltage measured value and the voltage prediction value of the obtained measurement point to obtain the measurement point error data, analyze the error data to obtain the deviation prediction value, optimize the distribution network voltage prediction model based on the deviation prediction value combined with reactive power regulation, and feed back the optimization results to the measurement points at different positions of the line to complete the reactive voltage regulation work of the distribution network.

[0032] Example 3 The present invention also provides a mobile terminal, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, such as a reactive voltage regulation program for a power distribution network.

[0033] When the processor executes the computer program, the steps of implementing the reactive voltage regulation method of the distribution network are as follows, for example: Establish distribution network voltage prediction model; Obtain the measured voltage values ​​and predicted voltage values ​​at different measurement points on the line; The actual voltage measured value and the voltage prediction value at the measurement point are compared to obtain the measurement point error data. The error data is analyzed to obtain the deviation prediction value. The distribution network voltage prediction model is optimized based on the deviation prediction value combined with reactive power regulation. The optimization result is fed back to the measurement points at different positions of the line to complete the reactive voltage regulation of the distribution network.

[0034] Alternatively, when the processor executes the computer program, the functions of each module in the above system are realized, for example: Prediction model building module 1, used to build a distribution network voltage prediction model; Data acquisition module 2, used to obtain the measured voltage value and the predicted voltage value at the measuring points at different positions of the line; The data processing and adjustment module 3 is used to compare the actual voltage measured value and the voltage prediction value of the obtained measurement point to obtain the measurement point error data, analyze the error data to obtain the deviation prediction value, optimize the distribution network voltage prediction model based on the deviation prediction value combined with reactive power regulation, and feed back the optimization results to the measurement points at different positions of the line to complete the reactive voltage regulation work of the distribution network.

[0035] Exemplarily, the computer program may be divided into one or more modules / units, which are stored in the memory and executed by the processor to implement the present invention. The one or more modules / units may be a series of computer program instruction segments capable of implementing specific functions, which are used to describe the execution process of the computer program in the mobile terminal.

[0036] For example, the computer program can be divided into a prediction model building module 1, a data acquisition module 2, and a data processing and adjustment module 3, and the specific functions of each module are as follows: Prediction model building module 1, used to build a distribution network voltage prediction model; Data acquisition module 2, used to obtain the measured voltage value and the predicted voltage value at the measuring points at different positions of the line; The data processing and adjustment module 3 is used to compare the actual voltage measured value and the voltage prediction value of the obtained measurement point to obtain the measurement point error data, analyze the error data to obtain the deviation prediction value, optimize the distribution network voltage prediction model based on the deviation prediction value combined with reactive power regulation, and feed back the optimization results to the measurement points at different positions of the line to complete the reactive voltage regulation work of the distribution network.

[0037] The mobile terminal may be a computing device such as a desktop computer, a notebook, a palm computer, a cloud server, etc. The mobile terminal may include, but is not limited to, a processor and a memory.

[0038] The processor 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. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the mobile terminal, and uses various interfaces and lines to connect various parts of the entire mobile terminal.

[0039] The memory may be used to store the computer programs and / or modules, and the processor implements various functions of the mobile terminal by running or executing the computer programs and / or modules stored in the memory and calling the data stored in the memory.

[0040] The memory 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 created according to the use of the mobile phone (such as audio data, a phone book, etc.), etc. In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (SmartMediaCard, SMC), a secure digital (SecureDigital, SD) card, a flash card (FlashCard), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0041] Example 4 The present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the reactive voltage regulation method for a distribution network are implemented.

[0042] If the module / unit integrated in the mobile terminal 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.

[0043] Based on such understanding, the present invention implements all or part of the processes in the above method, and can also be completed by instructing related hardware through a computer program, and the computer program can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the reactive voltage regulation method of the above distribution network can be implemented. Wherein, 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, etc.

[0044] The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0045] It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media does not include electrical carrier signals and telecommunication signals.

[0046] 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 reactive voltage regulation method for a distribution network, characterized in that: include: Establish distribution network voltage prediction model; Obtain the measured voltage values ​​and predicted voltage values ​​at different measurement points on the line; The actual voltage measured value and the voltage prediction value at the measurement point are compared to obtain the measurement point error data. The error data is analyzed to obtain the deviation prediction value. The distribution network voltage prediction model is optimized based on the deviation prediction value combined with reactive power regulation. The optimization result is fed back to the measurement points at different positions of the line to complete the reactive voltage regulation of the distribution network.

2. The reactive voltage regulation method of a distribution network according to claim 1, characterized in that: The specific process of obtaining the measured voltage values ​​at different measurement points on the line is as follows: Use voltage measuring devices at different locations to collect voltage and obtain collected values; The collected values ​​are uploaded to the operation dispatch center for analysis via wireless public network or carrier; The measured voltage values ​​at different measuring points of the output line are analyzed through operation scheduling.

3. The reactive voltage regulation method of a distribution network according to claim 1, characterized in that: The specific process of obtaining the voltage prediction value is as follows: By analyzing the factors affecting the distribution network voltage and solving the distribution network voltage prediction model based on the factors affecting the distribution network voltage, the voltage prediction values ​​of the measuring points at different positions of the line are obtained.

4. The reactive voltage regulation method of a distribution network according to claim 3, characterized in that: The factors affecting the voltage of the distribution network include three-phase imbalance, distribution capacity, load rate, distributed power supply, power supply radius and power factor.

5. The reactive voltage regulation method of a distribution network according to claim 3, characterized in that: The voltage prediction model of the distribution network is solved based on the distribution network voltage influencing factors to obtain the voltage prediction values ​​of the measuring points at different positions of the line, the main influencing factors of the distribution network voltage are analyzed, and a prediction model is constructed. The BP neural network is used to learn the processed training sample set, and the correlation coefficient of the BP neural network is adjusted to establish a distribution network voltage prediction model. The voltage is predicted by the prediction model, the voltage deviation of the distribution network is calculated, the reactive compensation optimization control strategy is formulated, and the distributed power source and other voltage regulating equipment of the power grid are actively managed and controlled.

6. The reactive voltage regulation method of a distribution network according to claim 1, characterized in that: The error data is analyzed to obtain a deviation prediction value, wherein in the error data analysis, the deviation prediction value is obtained by real-time calculation based on the voltage deviation, and when the deviation prediction value does not exceed a threshold, the distribution network voltage prediction model is optimized based on the deviation prediction value, and when the deviation prediction value exceeds the threshold, the distribution network voltage prediction model is optimized in combination with reactive power regulation.

7. The reactive voltage regulation method of a distribution network according to claim 6, characterized in that: The specific process of optimizing the distribution network voltage prediction model in combination with reactive power regulation when the deviation prediction value exceeds the threshold is as follows: Design a reactive power compensation scheme based on the deviation prediction value, where the reactive power compensation scheme includes SVG reactive power compensation device, photovoltaic distributed power source and multi-means coordinated control; A reactive voltage regulation control model is constructed based on the reactive compensation scheme, and the reactive regulation means are solved in the reactive voltage regulation control model according to the reactive compensation scheme, and the distribution network voltage prediction model is optimized according to the reactive regulation means.

8. A reactive voltage regulation system for a distribution network, characterized in that: include: A prediction model building module (1) is used to build a distribution network voltage prediction model; A data acquisition module (2) is used to obtain the measured voltage values ​​and predicted voltage values ​​at different measurement points of the line; The data processing and adjustment module (3) is used to compare the actual voltage measurement value and the voltage prediction value of the obtained measurement point to obtain the measurement point error data, analyze the error data to obtain the deviation prediction value, optimize the distribution network voltage prediction model based on the deviation prediction value combined with reactive power regulation, and feed back the optimization result to the measurement points at different positions of the line to complete the reactive power voltage regulation work of the distribution network.

9. A mobile terminal, characterized in that: The method comprises 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 reactive voltage regulation method for the distribution network as claimed in any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for reactive voltage regulation of a distribution network as claimed in any one of claims 1 to 7 is implemented.

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