Low-voltage power distribution network control system and low-voltage power distribution network control method

Abstract

The invention discloses a low-voltage power distribution network control system and a low-voltage power distribution network control method, and the system detects the harmonic current characteristics of a nonlinear load in real time through a nonlinear load detection module, and carries out dynamic management in combination with a low-voltage harmonic information instruction module, thereby effectively improving the real-time performance and accuracy of harmonic monitoring and management. The low-voltage power distribution network edge calculation gateway module can store detailed harmonic data and historical records according to the detection result of the nonlinear load, reliable basic support is provided for subsequent analysis and optimization, the system carries out quantitative analysis on the current peak of the nonlinear load by using the low-voltage harmonic disturbance risk calculation module, and the reliability of the system is improved. Therefore, precise prediction and effective suppression of harmonic wave fluctuation are realized, and the overall interference of harmonic waves on the system is greatly reduced. According to the system, through the integrated design of data detection, analysis and dynamic control, the accuracy and adaptability of low-voltage harmonic control are remarkably enhanced, and a powerful guarantee is provided for improving the operation quality of a low-voltage power distribution network.

Description

Technical Field

[0001] The present invention relates to the field of low-voltage harmonic control in a low-voltage distribution network, and in particular to a low-voltage distribution network control system and a low-voltage distribution network control method. Background Art

[0002] The low-voltage distribution network is a vital part of the modern power system. It not only directly serves residents and commercial users, but also undertakes the distribution and dispatching tasks of a large number of power loads. With the advancement of industrialization, the popularity of various nonlinear load devices (such as inverters, power electronic devices, etc.) in low-voltage distribution networks has led to a serious increase in harmonic pollution in low-voltage distribution networks. Harmonics are high-frequency current components generated by these nonlinear loads. When they propagate in the power system, they will have a great impact on the quality of the power grid. The harmonic problem of the low-voltage distribution network not only causes equipment damage and reduced energy efficiency, but may also cause the grid protection device to malfunction, seriously affecting the safe and stable operation of the power grid. Therefore, harmonic control of low-voltage distribution networks is particularly important.

[0003] At present, harmonic control technology for low-voltage distribution networks has made certain progress, mainly including passive filters, active filters and hybrid filters. Passive filters usually absorb harmonics of specific frequencies through LC circuits. Although the structure is simple, its adaptability is poor and it cannot effectively deal with the harmonic problems caused by dynamic load changes. Active filters use power electronics technology to detect and eliminate harmonics in real time. They have strong real-time performance and flexibility, but their cost is high and the control strategy is relatively complex. Hybrid filters combine the advantages of passive and active filters and can provide a more ideal harmonic suppression effect, but there are still problems such as high cost and difficult maintenance.

[0004] The harmonic control effect of existing technologies in low-voltage distribution networks is still relatively limited, which is mainly reflected in the following aspects. First, traditional harmonic control methods generally have the problem of low control efficiency. Although passive filters can eliminate harmonics of a certain frequency, when faced with load changes and harmonic frequency changes, the filtering effect is often unstable and cannot adapt to the dynamic changes of the power grid in real time. Active filters have certain advantages in real-time control of harmonics, but their control algorithms are complex and have slow response speeds, and they cannot make precise adjustments in a short time, thus affecting the overall efficiency of harmonic control. In addition, most of the existing harmonic control systems are based on single frequency processing and cannot fully and effectively suppress the existence of multi-band harmonics. Overall, the existing harmonic control methods for low-voltage distribution networks still have major deficiencies in terms of efficiency, adaptability and economy, and more advanced and comprehensive control systems and methods are urgently needed to improve the harmonic control capabilities and overall power grid quality of low-voltage distribution networks. Summary of the invention

[0005] In order to overcome the shortcomings and deficiencies of the prior art, the present invention provides a low-voltage distribution network control system and a low-voltage distribution network control method.

[0006] The technical solution adopted by the present invention is a low-voltage distribution network control system, including: a nonlinear load detection module, a low-voltage harmonic information instruction module, a low-voltage distribution network edge computing gateway module, a distorted voltage integration module, and a low-voltage harmonic disturbance risk calculation module;

[0007] The nonlinear load detection module is connected to the low-voltage harmonic information instruction module, and the nonlinear load detection module is used to manage the nonlinear load size and nonlinear load rectification information, and send the nonlinear load size and the nonlinear load rectification information to the low-voltage harmonic information instruction module; the nonlinear load size includes the low-voltage harmonic influence range; the nonlinear load rectification information includes the rectification time, rectification size, low-voltage harmonic sequence and the low-voltage harmonic information of all low-voltage harmonics in the low-voltage harmonic sequence;

[0008] The low-voltage harmonic information instruction module is also connected to the low-voltage distribution network edge computing gateway module, and the low-voltage harmonic information instruction module is used to send control instructions to the low-voltage distribution network edge computing gateway module; the control instructions include reorganizing the nonlinear load size and controlling the nonlinear load detection according to the nonlinear load rectification information; the reorganized nonlinear load size has a current spike; the current spike includes a low-voltage harmonic range, a nonlinear load detection power factor, a detection site altitude, a detection line distance, a unit time equipment failure rate, and a rectification size;

[0009] The low-voltage distribution network edge computing gateway module is also connected to the distorted voltage integration module, and the low-voltage distribution network edge computing gateway module is used to perform control operations according to the control instructions and detect nonlinear loads per unit time;

[0010] The distorted voltage integration module is also connected to the low-voltage harmonic disturbance risk calculation module, and the distorted voltage integration module is used to integrate the nonlinear load detection distortion voltage per unit time of the low-voltage distribution network edge computing gateway module, and send the nonlinear load detection distortion voltage to the low-voltage harmonic disturbance risk calculation module; the low-voltage harmonic disturbance risk calculation module is used to generate an instantaneous current fluctuation interval according to the nonlinear load detection distortion voltage and the nonlinear load rectification information, and control the low-voltage harmonics in the nonlinear load detection according to the instantaneous current fluctuation interval.

[0011] Optionally, also include:

[0012] A non-linear load detection transformer line fault module is used to obtain a non-linear load detection line fault of a terminal transformer; the non-linear load detection line fault includes non-linear load detection apparent power information, non-linear load detection demand time and non-linear load detection demand duration;

[0013] The current spike generating module is used to generate a current spike according to the nonlinear load detection line fault.

[0014] Optionally, also include:

[0015] The current spike control module is used to perform correlation analysis on the nonlinear load size by using the current spike, and reorganize the nonlinear load size to determine the nonlinear load size with the current spike.

[0016] Optionally, the low voltage harmonic disturbance risk calculation module specifically includes:

[0017] A current peak acquisition unit, used to acquire the current peak within the instantaneous current fluctuation interval;

[0018] A real-time control unit is used to control low voltage harmonics in non-linear load detection according to the current spike.

[0019] A low voltage distribution network control method, comprising:

[0020] Managing the nonlinear load size and nonlinear load rectification information, and sending the nonlinear load size and the nonlinear load rectification information to the low-voltage harmonic information instruction module; the nonlinear load size includes the low-voltage harmonic influence range; the nonlinear load rectification information includes the rectification time, rectification size, low-voltage harmonic sequence and low-voltage harmonic information of all low-voltage harmonics in the low-voltage harmonic sequence;

[0021] Sending a control instruction to the low-voltage distribution network edge computing gateway module; the control instruction includes reorganizing the nonlinear load size and controlling the nonlinear load detection according to the nonlinear load rectification information; the reorganized nonlinear load size has a current spike; the current spike includes a low-voltage harmonic range, a nonlinear load detection power factor, a detection site altitude, a detection line distance, a unit time equipment failure rate, and a rectification size;

[0022] Execute control operations according to the control instructions, and detect nonlinear loads per unit time;

[0023] The nonlinear load detection distortion voltage per unit time of the low-voltage distribution network edge computing gateway module is integrated, and the nonlinear load detection distortion voltage is sent to the low-voltage harmonic disturbance risk calculation module; the low-voltage harmonic disturbance risk calculation module is used to generate an instantaneous current fluctuation interval according to the nonlinear load detection distortion voltage and the nonlinear load rectification information, and control the low-voltage harmonics in the nonlinear load detection according to the instantaneous current fluctuation interval.

[0024] Optionally, after sending the nonlinear load size and the nonlinear load rectification information to the low-voltage harmonic information instruction module, the method further includes:

[0025] Acquire a nonlinear load detection line fault of the terminal transformer; the nonlinear load detection line fault includes nonlinear load detection apparent power information, nonlinear load detection demand time and nonlinear load detection demand duration;

[0026] A line fault is detected based on the non-linear load to generate a current spike.

[0027] Optionally, after generating a current spike by detecting a line fault according to the nonlinear load, the method further comprises:

[0028] The nonlinear load size is analyzed for correlation using the current spike, and the nonlinear load size is reorganized to determine the nonlinear load size with the current spike.

[0029] Optionally, the controlling of low-voltage harmonics in nonlinear load detection according to the instantaneous current fluctuation interval specifically includes:

[0030] Acquiring the current peak within the instantaneous current fluctuation interval;

[0031] Low voltage harmonics in non-linear load detection are controlled based on the current spike.

[0032] Beneficial effects:

[0033] The present invention proposes a low-voltage distribution network control system and a low-voltage distribution network control method. The low-voltage distribution network control system realizes efficient control of nonlinear load harmonics in the low-voltage distribution network by including a nonlinear load detection module, a low-voltage harmonic information instruction module, a low-voltage distribution network edge computing gateway module, and a low-voltage harmonic disturbance risk calculation module. The advantages of high control efficiency are mainly reflected in the following aspects: First, the system detects the harmonic current characteristics of the nonlinear load in real time through the nonlinear load detection module, and combines the low-voltage harmonic information instruction module for dynamic management, which effectively improves the real-time and accuracy of harmonic monitoring and management. Secondly, the low-voltage distribution network edge computing gateway module can store detailed harmonic data and historical records according to the detection results of the nonlinear load, providing a reliable basic support for subsequent analysis and optimization. Thirdly, the system uses the low-voltage harmonic disturbance risk calculation module to quantitatively analyze the current spikes of the nonlinear load, thereby realizing accurate prediction and effective suppression of harmonic fluctuations, and greatly reducing the overall interference of harmonics to the system. In general, the system integrates a multi-module collaborative working mechanism to ensure efficient operation of the entire process from data integration, management to execution control, and provides a powerful harmonic control capability for the low-voltage distribution network. The system significantly enhances the accuracy and adaptability of low-voltage harmonic control through the integrated design of data detection, analysis and dynamic control, providing a strong guarantee for improving the operation quality of the low-voltage distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] 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 will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0035] Figure 1 A structural diagram of a low-voltage distribution network control system provided by the present invention;

[0036] Figure 2 This is a flow chart of a low-voltage distribution network control method provided by the present invention. DETAILED DESCRIPTION

[0037] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other. The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0038] The object of the present invention is to provide a low-voltage distribution network control system and a low-voltage distribution network control method, which can improve the low-voltage harmonic control efficiency.

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] like Figure 1 As shown, a low-voltage distribution network control system includes: a nonlinear load detection module, a low-voltage harmonic information instruction module, a low-voltage distribution network edge computing gateway module, a distorted voltage integration module, and a low-voltage harmonic disturbance risk calculation module.

[0041] The nonlinear load detection module is connected to the low-voltage harmonic information instruction module. The nonlinear load detection module is used to manage the nonlinear load size and nonlinear load rectification information, and send the nonlinear load size and the nonlinear load rectification information to the low-voltage harmonic information instruction module; the nonlinear load size includes the low-voltage harmonic influence range; the nonlinear load rectification information includes the rectification time, rectification size, low-voltage harmonic sequence and the low-voltage harmonic information of all low-voltage harmonics in the low-voltage harmonic sequence; the nonlinear load detection module includes nonlinear load size management and nonlinear load rectification information management; wherein the nonlinear load size management refers to the management of the low-voltage harmonic influence range file; the correspondence between the nonlinear load detection and the low-voltage harmonic sequence can be determined through the nonlinear load rectification information, including the rectification time, rectification size, low-voltage harmonic sequence and the low-voltage harmonic information of all low-voltage harmonics in the low-voltage harmonic sequence.

[0042] The low-voltage harmonic information instruction module is also connected to the low-voltage distribution network edge computing gateway module, and the low-voltage harmonic information instruction module is used to send control instructions to the low-voltage distribution network edge computing gateway module; the control instructions include reorganizing the nonlinear load size and controlling the nonlinear load detection according to the nonlinear load rectification information; the reorganized nonlinear load size has a current spike; the current spike includes the low-voltage harmonic range, the nonlinear load detection power factor, the detection ground altitude, the detection line distance, the equipment failure rate per unit time and the rectification size; the low-voltage harmonic information instruction module (low-voltage harmonic information instruction module) is mainly used in the system for low-voltage harmonic packet reorganization and nonlinear load detection control.

[0043] The low-voltage distribution network edge computing gateway module is also connected to the distortion voltage integration module. The low-voltage distribution network edge computing gateway module is used to perform control operations and detect nonlinear loads per unit time according to the control instructions; the low-voltage distribution network edge computing gateway module performs corresponding control operations according to the data and commands sent by the low-voltage harmonic information instruction module.

[0044] Non-linear load detection module, function: used to manage and monitor the size of non-linear loads and their impact on the power grid.

[0045] Specific functions: Extract the rectification information of nonlinear load, including elapsed time and rectification size. Obtain low-voltage harmonic sequence information and related data of nonlinear load. Transmit the detected nonlinear load data (including harmonic influence range and waveform characteristics) to the low-voltage harmonic information instruction module.

[0046] Significance: Provide detailed data support for the control system by real-time detection of nonlinear loads and their behavioral characteristics.

[0047] Low voltage harmonic information instruction module, function: focus on processing and analyzing low voltage harmonic information in the distribution network.

[0048] Specific role: Integrate nonlinear load size and harmonic related operating parameters. Provide nonlinear load rectification information, such as operating time, rectification frequency and harmonic sequence data. Output low voltage harmonic information instruction instructions, including reorganization load and priority control strategy.

[0049] Significance: Improve the efficiency of harmonic management and optimize the harmonic power quality of the distribution network.

[0050] Low-voltage distribution network edge computing gateway module, function: store and manage data from the detection module and management module.

[0051] Specific role: Execute control operations of nonlinear loads according to control instructions. Provide real-time data support for subsequent analysis and system optimization.

[0052] Significance: It forms complete historical data of power grid operation and provides a basis for fault prediction and system stability research.

[0053] Distortion voltage integration module, function: responsible for real-time integration of distortion voltage information in the low-voltage distribution network.

[0054] Specific role: Monitor the impact of nonlinear loads on voltage waveforms. Transmit the integrated distorted voltage data to the low-voltage harmonic disturbance risk calculation module.

[0055] Significance: Ensuring that distorted voltage can be captured and evaluated in a timely manner helps to quickly respond to harmonic problems.

[0056] Low voltage harmonic disturbance risk calculation module, function: evaluate and calculate the potential risk of harmonic disturbance to the power grid system.

[0057] Specific role: Analyze the impact of low-voltage harmonic disturbance on system stability based on the distorted voltage and rectification information detected by nonlinear loads. Calculate the harmonic risk index and compare it with the preset threshold to determine whether load distribution needs to be adjusted.

[0058] Significance: Provide the system with quantitative harmonic risk assessment results so as to carry out targeted control operations.

[0059] The current peak analysis function (sub-function) is included in the low voltage harmonic information instruction module.

[0060] Function: Monitor current spikes within the low voltage harmonic range, including detection power factor and detection time of non-linear loads. Calculate the failure rate and stability parameters of a single device.

[0061] Significance: Optimize load distribution and reduce the damage of harmonics to the power grid.

[0062] The significance of the overall system: Through the coordinated work of these modules, the low-voltage distribution network can accurately monitor, manage and control nonlinear loads and the harmonic problems they generate, thereby improving the stability of grid operation and the quality of power.

[0063] The distorted voltage integration module is also connected to the low-voltage harmonic disturbance risk calculation module. The distorted voltage integration module is used to integrate the nonlinear load detection distortion voltage per unit time of the low-voltage distribution network edge computing gateway module, and send the nonlinear load detection distortion voltage to the low-voltage harmonic disturbance risk calculation module; the low-voltage harmonic disturbance risk calculation module is used to generate an instantaneous current fluctuation interval according to the nonlinear load detection distortion voltage and the nonlinear load rectification information, and control the low-voltage harmonics in the nonlinear load detection according to the instantaneous current fluctuation interval. The distorted voltage integration module is used to integrate the screen on the low-voltage distribution network edge computing gateway module; the low-voltage harmonic disturbance risk calculation module generates the final instantaneous current fluctuation interval according to the integrated harmonic pollution range information and nonlinear load rectification information; a low-voltage distribution network control system has a workflow of nonlinear load size and nonlinear load rectification, low-voltage harmonic packet reorganization, scheduling generation, low-voltage harmonic time screen integration, harmonic pollution range upload, and data analysis.

[0064] Low voltage harmonics and nonlinear load rectification and distribution:

[0065] After importing the new low-voltage harmonic file, the nonlinear load detection module will automatically send it to the corresponding detection site low-voltage harmonic information instruction module according to the detection site where the low-voltage harmonic is placed, and the nonlinear load rectification information will also be automatically sent to the corresponding detection site low-voltage harmonic information instruction module; at the same time, the nonlinear load detection module will send the nonlinear load rectification information to the low-voltage harmonic disturbance risk calculation module for subsequent generation of instantaneous current fluctuation range.

[0066] Low voltage harmonic package reorganization, including:

[0067] 1. Rectification algorithm generation: After the low-voltage harmonic information instruction module receives the nonlinear load rectification information sent by the nonlinear load detection module, it generates a unique current spike for each low-voltage harmonic by calling the currently mature rectification algorithm based on the nonlinear load detection apparent power information. The current spike contains the following information: low-voltage harmonic range, low-voltage harmonic, detection site altitude, detection line distance, unit time equipment failure rate, and rectification size.

[0068] The specific algorithm is as follows:

[0069] The rectification algorithm generation algorithm adopts the currently widely used QR (Quick-Response) code. Java programming is used in the low-voltage harmonic information instruction module platform, and the jar package - QRCode.jar needs to be called.

[0070] You need to add "package qrcode;" in the Java class definition, and call the QRCode library function -qRCodeCommon(String content,String imgType,int size) during the programming process, where Stringcontent is the string to be encoded, that is, the information contained in the current spike: low-voltage harmonic range, low-voltage harmonics, detection site altitude, detection line distance, equipment failure rate per unit time, and rectification size; String imgType is the harmonic pollution range format to be output, and int size is the size of the generated rectification algorithm.

[0071] Call the rectification algorithm generated by the QR code and save it to the specified path for use in DCP reorganization.

[0072] 2. Repackaging the low-voltage harmonic DCP. After receiving the DCP file sent by the nonlinear load detection module, the low-voltage harmonic information instruction module calls the currently mature OpenCV algorithm to add current spikes to each frame of the original DCP data, and finally outputs a new low-voltage harmonic DCP' file.

[0073] The specific algorithm is as follows:

[0074] The video files are processed through the javaCV library and the openCV library. The javaCV part is responsible for reading low-voltage harmonic DCP files and Frame and Mat conversion operations, and the openCV is responsible for distorted voltage loading, distorted voltage storage, distorted voltage superposition, and transparency processing.

[0075] 1) Take a frame of video from the read video stream and convert it into Mat.

[0076] Matmat=converter.convertToMat(grabber.grabFrame())

[0077] 2) Define the location where the rectification algorithm distortion voltage is copied and the size of the rectification algorithm distortion voltage.

[0078] Mat qrcode=opencv_imgcodecs.imread("qrcode.png");

[0079] "qrcode.png" is the harmonic pollution range altitude of the rectification algorithm. This function is used to read the harmonic pollution range data of the rectification algorithm into the memory.

[0080] This function is used to define the position and size of the video frame where the rectification algorithm will be copied.

[0081] 3) Copy the rectification algorithm distortion voltage defined in 2) to each frame of the video.

[0082] opencv_core.addWe i ghted(RO I,0.2,qrcode,0.8,0.0,RO I);

[0083] RO I, qrcode is the rectification algorithm attribute value defined in 2).

[0084] 0.2 is the first weight value of the distortion voltage transparency of the rectification algorithm, and 0.8 is the second weight value of the distortion voltage transparency of the rectification algorithm.

[0085] 4) Finally, the low-voltage harmonic information instruction module will send the newly generated low-voltage harmonic DCP' file to the low-voltage harmonic information instruction module server.

[0086] 3. Data Analysis

[0087] After collecting the uploaded harmonic pollution range with current spikes, the low-voltage harmonic disturbance risk calculation module calls the current spike identification program to read the information contained in the current spike and save the information to the low-voltage harmonic information edge computing gateway.

[0088] The nonlinear load rectification information sent by the nonlinear load detection module to the low-voltage harmonic disturbance risk calculation module already exists in the low-voltage harmonic information edge computing gateway; the nonlinear load detection module compares the information in the identified current spike with the local nonlinear load rectification information.

[0089] Finally, the low-voltage harmonic disturbance risk calculation module will automatically generate a test report based on the test results. The test report will add the harmonic pollution range used in the process of generating the control report as a report attachment. The time situation of the low-voltage harmonics can be directly understood through the report.

[0090] like Figure 2 As shown, a low voltage distribution network control method includes:

[0091] Step S1: managing the nonlinear load size and the nonlinear load rectification information, and sending the nonlinear load size and the nonlinear load rectification information to the low voltage harmonic information instruction module;

[0092] The nonlinear load size includes the low-voltage harmonic influence range; the nonlinear load rectification information includes rectification time, rectification size, low-voltage harmonic sequence and low-voltage harmonic information of all low-voltage harmonics in the low-voltage harmonic sequence.

[0093] Step S2: Obtain a nonlinear load detection line fault of the terminal transformer; the nonlinear load detection line fault includes nonlinear load detection apparent power information, nonlinear load detection required time and nonlinear load detection required duration; generate a current spike according to the nonlinear load detection line fault; use the current spike to perform a correlation analysis on the nonlinear load size, reorganize the nonlinear load size to determine the nonlinear load size with the current spike.

[0094] Step S3: Sending a control instruction to the low-voltage distribution network edge computing gateway module; the control instruction includes reorganizing the nonlinear load size and controlling nonlinear load detection according to the nonlinear load rectification information; the reorganized nonlinear load size has a current spike;

[0095] The current spike includes low voltage harmonic range, nonlinear load detection power factor, detection site altitude, detection line distance, unit time equipment failure rate and rectification size.

[0096] Step S4: executing control operation according to the control instruction and detecting nonlinear load per unit time.

[0097] Step S5: Integrate the nonlinear load detection distortion voltage per unit time of the low-voltage distribution network edge computing gateway module, and send the nonlinear load detection distortion voltage to the low-voltage harmonic disturbance risk calculation module; the low-voltage harmonic disturbance risk calculation module is used to generate an instantaneous current fluctuation interval according to the nonlinear load detection distortion voltage and the nonlinear load rectification information, and control the low-voltage harmonics in the nonlinear load detection according to the instantaneous current fluctuation interval.

[0098] Step S6: Acquire the current peak within the instantaneous current fluctuation interval; and control the low-voltage harmonics in the nonlinear load detection according to the current peak.

[0099] In the traditional low-voltage harmonic control time system, three steps are used: wavelet transform to integrate the harmonic pollution range, manually upload the harmonic pollution range, and identify the low-voltage harmonics using the frequency domain analysis method. In this process, not only is the efficiency relatively low, but there may be situations that cannot be identified by the naked eye, which will greatly reduce the performance of the low-voltage harmonic rectification system.

[0100] The low-voltage distribution network control system and low-voltage distribution network control method provided by the present invention can efficiently identify and manage harmonic problems through the collaborative work of modules such as nonlinear load detection, harmonic information instructions, data storage and analysis, distortion voltage integration and risk calculation, realize accurate monitoring and dynamic adjustment of nonlinear loads, improve power quality and stability of distribution network operation, and have the significant advantages of strong real-time performance, high degree of intelligence, and strong adaptability to complex power grid environments. .

[0101] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0102] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A low voltage distribution network control system, characterized in that: include: Non-linear load detection module, low-voltage harmonic information instruction module, low-voltage distribution network edge computing gateway module, distortion voltage integration module, low-voltage harmonic disturbance risk calculation module; The nonlinear load detection module is used to manage the nonlinear load size and nonlinear load rectification information, and send the nonlinear load size and the nonlinear load rectification information to the low-voltage harmonic information instruction module; the nonlinear load size includes the low-voltage harmonic influence range; the nonlinear load rectification information includes the rectification time, rectification size, low-voltage harmonic sequence and low-voltage harmonic information of all low-voltage harmonics in the low-voltage harmonic sequence; The low-voltage harmonic information instruction module is used to send a control instruction to the low-voltage distribution network edge computing gateway module; the control instruction includes reorganizing the nonlinear load size and controlling the nonlinear load detection according to the nonlinear load rectification information; the reorganized nonlinear load size has a current spike; the current spike includes a low-voltage harmonic range, a nonlinear load detection power factor, a detection site altitude, a detection line distance, a unit time equipment failure rate, and a rectification size; The low-voltage distribution network edge computing gateway module is used to perform control operations according to the control instructions and detect nonlinear loads per unit time; The distortion voltage integration module is used to integrate the nonlinear load detection distortion voltage per unit time of the low-voltage distribution network edge computing gateway module, and send the nonlinear load detection distortion voltage to the low-voltage harmonic disturbance risk calculation module; The low-voltage harmonic disturbance risk calculation module is used to generate an instantaneous current fluctuation interval according to the nonlinear load detection distortion voltage and the nonlinear load rectification information, and control the low-voltage harmonics in the nonlinear load detection according to the instantaneous current fluctuation interval.

2. A low voltage distribution network control system according to claim 1, characterized in that: Also includes: A non-linear load detection transformer line fault module is used to obtain a non-linear load detection line fault of a terminal transformer; The non-linear load detection line fault includes non-linear load detection apparent power information, non-linear load detection demand time and non-linear load detection demand duration; The current spike generating module is used to generate a current spike according to the nonlinear load detection line fault.

3. A low voltage distribution network control system according to claim 2, characterized in that: Also includes: The current spike control module is used to perform correlation analysis on the nonlinear load size by using the current spike, and reorganize the nonlinear load size to determine the nonlinear load size with the current spike.

4. A low voltage distribution network control system according to claim 3, characterized in that: The low voltage harmonic disturbance risk calculation module specifically includes: A current peak acquisition unit is used to acquire the current peak within the instantaneous current fluctuation interval.

5. A low voltage distribution network control system according to claim 3, characterized in that: The low-voltage harmonic disturbance risk calculation module specifically includes a real-time control unit, which is used to control the low-voltage harmonics in the nonlinear load detection according to the current spike.

6. A low voltage distribution network control method, characterized in that: include: Managing the nonlinear load size and nonlinear load rectification information, and sending the nonlinear load size and the nonlinear load rectification information to the low-voltage harmonic information instruction module; the nonlinear load size includes the low-voltage harmonic influence range; the nonlinear load rectification information includes the rectification time, rectification size, low-voltage harmonic sequence and low-voltage harmonic information of all low-voltage harmonics in the low-voltage harmonic sequence; Sending a control instruction to the low-voltage distribution network edge computing gateway module; the control instruction includes reorganizing the nonlinear load size and controlling the nonlinear load detection according to the nonlinear load rectification information; the reorganized nonlinear load size has a current spike; the current spike includes a low-voltage harmonic range, a nonlinear load detection power factor, a detection site altitude, a detection line distance, a unit time equipment failure rate, and a rectification size; Execute control operations according to the control instructions, and detect nonlinear loads per unit time; Integrate the nonlinear load detection distortion voltage per unit time of the low-voltage distribution network edge computing gateway module, and send the nonlinear load detection distortion voltage to the low-voltage harmonic disturbance risk calculation module; The low-voltage harmonic disturbance risk calculation module is used to generate an instantaneous current fluctuation interval according to the nonlinear load detection distortion voltage and the nonlinear load rectification information, and control the low-voltage harmonics in the nonlinear load detection according to the instantaneous current fluctuation interval.

7. A low voltage distribution network control method according to claim 6, characterized in that: After sending the nonlinear load size and the nonlinear load rectification information to the low voltage harmonic information instruction module, the method further includes: A nonlinear load detection line fault of the terminal transformer is obtained; the nonlinear load detection line fault includes nonlinear load detection apparent power information, nonlinear load detection required time and nonlinear load detection required duration.

8. A low voltage distribution network control method according to claim 6, characterized in that: A line fault is detected based on the non-linear load to generate a current spike.

9. A low voltage distribution network control method according to claim 6, characterized in that: After the generating of the current spike according to the detecting line fault of the nonlinear load, the method further comprises: The nonlinear load size is analyzed for correlation using the current spike, and the nonlinear load size is reorganized to determine the nonlinear load size with the current spike.

10. A low voltage distribution network control method according to claim 7, characterized in that: The controlling of low-voltage harmonics in nonlinear load detection according to the instantaneous current fluctuation interval specifically includes: Acquiring the current peak within the instantaneous current fluctuation interval; Low voltage harmonics in non-linear load detection are controlled based on the current spike.

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