Electric energy quality management system
By using the real-time monitoring and rectification plan verification of the power quality management system, the problem of low efficiency in rectifying power quality issues has been solved, achieving rapid response and effective power quality management.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-08
- Publication Date
- 2026-05-08
AI Technical Summary
Current technologies have low efficiency in rectifying power quality problems and cannot be implemented quickly during periods of increased load, resulting in users experiencing low voltage and other quality issues for extended periods.
A power quality management system is adopted to monitor power quality issues in real time through the collaborative work of the main station, the first monitoring terminal, and the second monitoring terminal. Based on the line topology diagram and power data, the rectification plan is simulated and verified to determine whether rectification measures should be implemented.
It has improved the efficiency of power quality rectification in the distribution network, ensured the timely resolution of power quality issues and the effective implementation of rectification plans, and enhanced the user's electricity experience and the stability of the power grid.
Smart Images
Figure CN122001083A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of power quality management technology, and in particular to a power quality management system. Background Technology
[0002] With the rapid growth of electricity demand in urban and rural areas, power quality problems such as heavy overload operation, three-phase load imbalance, and low voltage frequently occur on the low-voltage side of distribution transformer areas during peak electricity consumption periods. These problems directly affect the normal operation of electrical equipment at the user end, leading to shortened equipment lifespan or even large-scale power outages. Due to the significant peak-valley fluctuation characteristics of electricity load, some areas require repeated rectification measures to ensure power supply quality during periods of load surge due to insufficient grid capacity.
[0003] Current technologies for addressing power quality issues primarily involve adjusting the power supply range of distribution transformer areas through load switching to distribute the load pressure in heavily overloaded areas; replacing low-voltage conductors with higher-specification ones to increase line current carrying capacity; and replacing undercapacitated distribution transformers to improve power supply capacity. These measures require multiple stages, including site surveys, plan approvals, material procurement, and construction coordination.
[0004] However, power quality improvement measures are constrained by lengthy approval processes and construction cycles, making it impossible to implement them quickly during periods of peak load. This results in users enduring quality issues such as low voltage for extended periods. Therefore, existing technologies suffer from low efficiency in power quality improvement. Summary of the Invention
[0005] This application provides a power quality management system to achieve the technical effect of improving the efficiency of power quality rectification in the distribution network.
[0006] In a first aspect, embodiments of this application provide a power quality management system, comprising:
[0007] The main station consists of the first monitoring terminal located in the target distribution area and the second monitoring terminal located on the low-voltage downlead in the target distribution area.
[0008] The main station is used to update the line topology map of the target transformer area based on the rectification plan for the power quality problem obtained, and to send data acquisition instructions to the first monitoring terminal; the line topology map is obtained in advance by surveying the low-voltage distribution lines of the target transformer area.
[0009] The first monitoring terminal is used to send data acquisition instructions to the second monitoring terminal;
[0010] The second monitoring terminal is used to acquire pre-frozen power data according to the data acquisition instructions and send the power data to the first monitoring terminal.
[0011] The first monitoring terminal is also used to send power data to the main station;
[0012] The main station is also used to verify rectification plans for power quality issues based on power data and line topology diagrams, in order to determine whether to implement the rectification plan.
[0013] In one possible implementation, the main site is specifically used for:
[0014] The impedance values in the line topology diagram are simulated and calculated based on the power data to obtain the simulation verification results corresponding to the rectification plan; the implementation of the rectification plan is determined based on the simulation verification results.
[0015] In one possible implementation, the first monitoring terminal is also used to send a load data value freeze command to the second monitoring terminal and send power quality data to the master station when a first type of power quality problem is detected.
[0016] The second monitoring terminal is also used to freeze the currently collected power data according to the load data value freeze command. The power data includes at least the power quality type, occurrence time and impedance value of the current transformer area.
[0017] The main station is also used to create work orders to be inspected based on power quality data; and to determine rectification plans for the first type of power quality problems based on the work orders to be inspected.
[0018] In one possible implementation, the first type of power quality problem includes heavy overload problems and three-phase imbalance problems; the first monitoring terminal is specifically used for:
[0019] When the load capacity of the target transformer area calculated according to the heavy overload test formula exceeds the preset heavy overload threshold, a heavy overload problem is determined to have occurred.
[0020] When the three-phase imbalance degree of the target transformer area calculated according to the three-phase imbalance degree test formula exceeds the preset three-phase imbalance degree threshold, a three-phase imbalance problem is determined to have occurred.
[0021] In one possible implementation, when the master station determines the rectification plan for the first type of power quality problem based on the work order to be inspected, it is specifically used for:
[0022] Based on the work order to be inspected, at least one of the following is identified as the rectification plan corresponding to the first type of power quality problem: load cut-off, replacement of low-voltage conductors, and replacement of distribution transformer.
[0023] In one possible implementation, the main station is also used to: receive second-type power quality problems reported by users; establish a work order to be inspected corresponding to the second-type power quality problem; and determine a rectification plan for the second-type power quality problem based on the work order to be inspected.
[0024] In one possible implementation, when the first type of power quality problem is a heavy overload problem, the master station is specifically used for:
[0025] The impedance values in the line topology diagram are calculated based on the heavy overload test formula to obtain the heavy overload simulation test results.
[0026] If the simulated load capacity in the heavy overload simulation verification results does not exceed the preset heavy overload threshold, a rectification plan will be determined.
[0027] If the simulated load capacity in the heavy overload simulation verification results exceeds the preset heavy overload threshold, it will be determined that no rectification plan will be implemented.
[0028] In one possible implementation, when the first type of power quality problem is a three-phase imbalance problem, the master station is specifically used for:
[0029] Based on the three-phase unbalance test formula, the impedance value in the line topology diagram is calculated to obtain the simulation test result of the three-phase unbalance.
[0030] If the simulated three-phase imbalance in the three-phase imbalance simulation verification results does not exceed the preset three-phase balance threshold, a rectification plan will be implemented.
[0031] If the simulated three-phase imbalance in the three-phase imbalance simulation verification results exceeds the preset three-phase balance threshold, it is determined that no rectification plan will be implemented.
[0032] In one possible implementation, upon receiving a Type II power quality problem, the master station specifically performs the following actions:
[0033] Calculate the total current value at the beginning of the target transformer area based on the voltage at the beginning and the impedance value of the corresponding phase line; the voltage at the beginning of the target transformer area where the second type of power quality problem occurs is the voltage at the beginning of the target transformer area.
[0034] Calculate the simulated verification voltage value of the low-voltage point based on the total current value;
[0035] When the simulated voltage value meets the preset threshold, a rectification plan will be implemented.
[0036] If the simulated voltage value does not meet the preset voltage threshold, it will be determined that no rectification plan will be implemented.
[0037] In one possible implementation, when multiple power quality data are received, the master station also uses:
[0038] When multiple power quality data points are determined to have the same power quality type, they are sorted from highest to lowest according to the severity of the first type of power quality problem.
[0039] Create inspection work orders for the most severe Category I power quality problems.
[0040] Secondly, embodiments of this application provide an electronic device, including: a memory and a processor;
[0041] The memory stores computer-executed instructions;
[0042] The processor executes computer execution instructions stored in the memory, causing the processor to perform the first aspect and / or various possible implementations of the first aspect as described above.
[0043] Thirdly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the first aspect and / or various possible implementations of the first aspect.
[0044] Fourthly, embodiments of this application provide a computer program product, including a computer program that, when executed by a processor, implements the first aspect and / or various possible implementations of the first aspect.
[0045] The power quality management system provided in this application includes a master station, a first monitoring terminal located in the target distribution area, and a second monitoring terminal located on the low-voltage down-lead of the target distribution area. The master station updates the line topology map of the target distribution area based on the acquired power quality problem rectification plan and sends data acquisition commands to the first monitoring terminal. The master station also verifies the power quality problem rectification plan based on power data and the line topology map to determine whether to implement the rectification plan. The first monitoring terminal sends the data acquisition commands to the second monitoring terminal and also sends power data to the master station. The second monitoring terminal acquires pre-frozen power data according to the data acquisition commands and sends the power data to the first monitoring terminal. This effectively improves the efficiency of power quality rectification in the distribution network. Attached Figure Description
[0046] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.
[0047] Figure 1 Schematic diagram of the power quality management system provided in this application Figure 1 ;
[0048] Figure 2 A schematic diagram of the low-voltage side topology of the distribution transformer target area for the power quality management system provided in this application;
[0049] Figure 3 Schematic diagram of the power quality management system provided in this application Figure 2 ;
[0050] Figure 4 Flowchart of the power quality management system provided in this application Figure 3 ;
[0051] Figure 5 A flowchart illustrating the power quality management method of the master station in the power quality management system provided in this application;
[0052] Figure 6 A hardware schematic diagram of the power quality management system provided in this application.
[0053] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation
[0054] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of methods and approaches consistent with some aspects of this application as detailed in the appended claims.
[0055] With a sharp increase in electricity load, power quality problems such as heavy overload, three-phase imbalance, and low voltage can easily occur on the low-voltage side of distribution transformer areas. Currently, power supply companies address these problems by implementing measures such as load cut-off, replacing low-voltage conductors, and replacing distribution transformers. However, these measures can take several months to implement. As the load decreases, the power quality problems will automatically and temporarily disappear, making it impossible to directly verify the effectiveness of the rectification measures implemented by the power supply company. When the load surges again, the power quality problems may reappear, again affecting users' normal electricity use and prolonging the actual rectification time. Currently, power supply companies lack specific measures to verify the effectiveness of power quality rectification projects. After project completion, they can only wait for the next peak load period for self-verification, which is extremely inefficient and cannot effectively improve the efficiency of low voltage rectification. Incomplete rectification can even lead to long-term disruptions to users' normal electricity use. Therefore, existing technologies suffer from poor power quality management and low efficiency in power quality rectification.
[0056] The power quality management system provided in this application includes a master station, a first monitoring terminal located in the target distribution area, and a second monitoring terminal located on the low-voltage down-lead of the target distribution area. The master station updates the line topology map of the target distribution area based on the acquired power quality problem rectification plan and sends data acquisition commands to the first monitoring terminal. The master station also verifies the power quality problem rectification plan based on power data and the line topology map to determine whether to implement the rectification plan. The first monitoring terminal sends the data acquisition commands to the second monitoring terminal and also sends power data to the master station. The second monitoring terminal acquires pre-frozen power data according to the data acquisition commands and sends the power data to the first monitoring terminal. This effectively improves the efficiency of power quality rectification in the distribution network.
[0057] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.
[0058] Figure 1 Schematic diagram of the power quality management system provided in this application Figure 1 ,like Figure 1 As shown, the system includes: a main station, a first monitoring terminal set up in the target transformer area, and a second monitoring terminal set up on the low-voltage downlead in the target transformer area.
[0059] S101. Based on the rectification plan for the power quality problem obtained, the main station updates the line topology map of the target transformer area and sends a data acquisition command to the first monitoring terminal.
[0060] In this embodiment, the data of the line topology map of the target transformer area is modified. The modifications are carried out according to the actual rectification content. For load cutover, the entire cut-out line segment is removed and added under the actual cut-in transformer area. After the cutover adjustment of the power quality management system is completed, the power quality management system will automatically adjust the naming of the conductor measured impedance and the impedance collected by the second monitoring terminal according to the rules, and send it to all second monitoring terminals for updating. When replacing low-voltage conductors, the cross-sectional area and material of the conductors are reselected. When replacing distribution transformers, the capacity, model, and other information of the transformer area in the system are updated. Furthermore, the master station sends a data acquisition command to the first monitoring terminal of the target transformer area. The data acquisition command includes, but is not limited to, the target transformer area number, the target transformer area name, the power quality type, and the occurrence time.
[0061] Optionally, the line topology map is obtained in advance based on the low-voltage distribution lines of the target transformer area. This power quality management system uses a single distribution transformer area as its core, employing drones to survey the low-voltage distribution lines. The main measurement is the length of the low-voltage conductors. The low-voltage distribution lines are divided into multiple conductor segments using the down conductor as the dividing point. The cross-sectional area and material of the conductors are manually selected within the system. The impedance value of a conductor segment is calculated using the formula shown below:
[0062]
[0063] Where R is the measured resistance of the conductor, ρ is the resistivity, mainly determined by the material and temperature of the conductor, L is the length of the conductor, A is the cross-sectional area of the conductor, X is the measured reactance of the conductor, and D is the measured reactance of the conductor. AB D is the straight-line distance between phase A conductor and phase B conductor. BC D is the straight-line distance between phase B conductor and phase C conductor. CA D is the straight-line distance between phase C conductor and phase A conductor. Z It is the radius of the conductor core.
[0064] In one possible implementation, the naming rules for the measured impedance of a conductor are as follows: the measured impedance of a conductor is identified by L, and the string of numbers following L represents a branch (the first digit represents the first-level branch, the second digit represents the second-level branch, the third digit represents the third-level branch, and so on). A "-" is immediately following the branch number, and the number after the "-" is the measured impedance number of the conductor for that branch. For example, L112-3 represents the measured impedance of the third conductor in the third-level branch (code 2) under the second-level branch (code 1) under the first-level branch (code 1).
[0065] A first monitoring terminal is installed on the low-voltage side of the target distribution transformer area, and a second monitoring terminal is installed on each low-voltage downlead of the target distribution transformer area. Both the first and second monitoring terminals have built-in voltage and current transformers to collect voltage and current data at the head end of the target distribution transformer area and the user side. The naming rule for the impedance collected by the second monitoring terminal is the same as the naming rule for the calculated impedance of the conductors, except that the impedance collected by the second monitoring terminal is identified by F. For example, F11-2 represents the calculated impedance of the third conductor in the third-level branch line (code 2) under the second-level branch line (code 1) of the first-level branch line. An exemplary topology diagram of the low-voltage side of the target distribution transformer area is shown in Figure 2.
[0066] S102, the first monitoring terminal sends the data acquisition command to the second monitoring terminal.
[0067] In this embodiment, after receiving the data acquisition instruction, the first monitoring terminal sends the data acquisition instruction to the second monitoring terminal. The data acquisition instruction includes, but is not limited to, the power quality type and the time of occurrence.
[0068] S103. The second monitoring terminal acquires the pre-frozen power data according to the data acquisition instruction and sends the power data to the first monitoring terminal.
[0069] In this embodiment, the second monitoring terminal selects the corresponding data and uploads it to the first monitoring terminal according to the received data acquisition instruction. The uploaded content includes, but is not limited to, the naming number of the impedance acquired by the second monitoring terminal and the impedance value acquired by the second monitoring terminal.
[0070] S104, The first monitoring terminal sends the power data to the main station.
[0071] In this embodiment, the first monitoring terminal sends the power data collected by the second detection terminal to the main station.
[0072] S105. The main station verifies the rectification plan for power quality issues based on power data and line topology diagram to determine whether to implement the rectification plan.
[0073] In this embodiment, after receiving the power data sent by the first monitoring terminal, the main station verifies the rectification plan for the power quality problem based on the power data and the line topology diagram, thereby verifying the rectification effect of the rectification plan and determining whether the rectification plan can be implemented.
[0074] In one possible implementation, the main station is primarily used to simulate and calculate the impedance values in the line topology diagram based on power data, and obtain the simulation verification results corresponding to the rectification plan; based on the simulation verification results, it is determined whether to implement the rectification plan.
[0075] The power quality management system provided in this application includes a master station, a first monitoring terminal located in the target distribution area, and a second monitoring terminal located on the low-voltage down-lead of the target distribution area. The master station updates the line topology map of the target distribution area based on the acquired power quality problem rectification plan and sends data acquisition commands to the first monitoring terminal. The master station also verifies the power quality problem rectification plan based on power data and the line topology map to determine whether to implement the rectification plan. The first monitoring terminal sends the data acquisition commands to the second monitoring terminal and also sends power data to the master station. The second monitoring terminal acquires pre-frozen power data according to the data acquisition commands and sends the power data to the first monitoring terminal. This effectively improves the efficiency of power quality rectification in the distribution network.
[0076] Figure 3 Schematic diagram of the power quality management system provided in this application Figure 2,like Figure 3 As shown, in this embodiment... Figure 1 Based on the implementation examples, the process for handling the first type of power quality problem detected in the power quality management system, i.e., the process before determining the rectification plan for the first type of power quality problem, includes:
[0077] S301. The first monitoring terminal sends a load data value freeze command to the second monitoring terminal and sends power quality data to the main station.
[0078] In this embodiment, when the first monitoring terminal detects a first type of power quality problem, the first monitoring terminal sends a load data value freeze command to all the second monitoring terminals below it, and sends the power quality data of the target transformer area to the main station. The data sent includes, but is not limited to, transformer area number, transformer area name, power quality type, and occurrence time.
[0079] In one possible implementation, the first type of power quality problem includes heavy overload and three-phase imbalance. Heavy overload refers to an operating state in which the load on electrical equipment exceeds its rated capacity. Three-phase imbalance refers to a state in a three-phase power system where the amplitudes of the three-phase voltages or currents are not equal, or the phase difference is not 120°, or both.
[0080] In one possible implementation, the first monitoring terminal is specifically used for:
[0081] When the load capacity of the target transformer area calculated according to the heavy overload test formula exceeds the preset heavy overload threshold, a heavy overload problem is determined to have occurred.
[0082] When the three-phase imbalance degree of the target transformer area calculated according to the three-phase imbalance degree test formula exceeds the preset three-phase imbalance degree threshold, a three-phase imbalance problem is determined to have occurred.
[0083] The following formula can be used to determine whether a target area has experienced a severe overload:
[0084]
[0085] The following formula can be used to determine whether a three-phase imbalance has occurred in the target transformer area:
[0086]
[0087] Where S is the total capacity of the target area; This refers to the voltage of phase A conductor; The current in phase A conductor; This refers to the voltage of phase B conductor; This refers to the current in phase B conductor; This refers to the voltage of phase C conductor; This represents the current in phase C conductors.
[0088] S302. The second monitoring terminal freezes the currently collected power data according to the load data value freeze command.
[0089] In this embodiment, the power data includes at least the current power quality type, occurrence time, and impedance value of the transformer area. The power data frozen in this step is used for... Figure 1 In step S103, the second monitoring terminal acquires the pre-frozen power data according to the data acquisition instruction and sends the power data to the first monitoring terminal.
[0090] S303. The main station establishes a work order to be inspected corresponding to the power quality data based on the power quality data; and determines the rectification plan for the first type of power quality problem based on the work order to be inspected.
[0091] In this embodiment, when the master station determines the rectification plan for the first type of power quality problem based on the work order to be inspected, the specific operation is as follows: based on the work order to be inspected, at least one of the following is determined as the rectification plan corresponding to the first type of power quality problem: load cut-off, replacement of low-voltage conductors, and replacement of distribution transformer.
[0092] When determining the rectification plan for the first type of power quality problem based on the work order to be inspected, the main station will comprehensively consider measures such as load cut-off, replacement of low-voltage conductors and replacement of distribution transformers to ensure that power quality is effectively improved.
[0093] Load cutover refers to transferring existing loads from current equipment or lines to new equipment or lines to achieve load redistribution and optimization. Its purposes include improving network redundancy and reliability, adding or replacing equipment, and adjusting data flow. The implementation steps cover establishing a cutover project team, preparing cutover documentation, conducting on-site surveys, developing a cutover plan, reviewing and approving the cutover plan, disseminating and training on the cutover plan, pre-cutover preparations, on-site cutover operations, cleaning up the cutover site, post-cutover operational monitoring, and obtaining a cutover confirmation.
[0094] Replacing low-voltage conductors involves selecting appropriate conductor materials and structures to replace them when they are aging, damaged, or no longer meet the current power grid requirements, thus ensuring the normal operation of the power grid and power quality. When selecting conductors, factors such as conductivity, heat resistance, oil resistance, flexibility, insulation performance, safety, and cost must be comprehensively considered.
[0095] Replacing distribution transformers mainly targets old, high-energy-consuming transformers. These transformers have high losses, and replacing them with new energy-saving transformers can improve economic efficiency, reduce line loss rates, and promote the development of power supply companies.
[0096] In determining the rectification plan for the first type of power quality problem, the main station will flexibly select measures such as load cut-off, replacement of low-voltage conductors, or replacement of distribution transformers based on the actual situation in order to improve power grid performance and power quality.
[0097] In one possible implementation, when the first type of power quality problem is a heavy overload problem, the master station calculates the impedance value in the line topology diagram according to the heavy overload test formula to obtain the heavy overload simulation test result; if the simulated load capacity in the heavy overload simulation test result does not exceed the preset heavy overload threshold, it is determined to implement the rectification plan; if the simulated load capacity in the heavy overload simulation test result exceeds the preset heavy overload threshold, it is determined not to implement the rectification plan.
[0098] In one possible implementation, when the first type of power quality problem is a three-phase imbalance problem, the main station calculates the impedance value in the line topology diagram according to the three-phase imbalance test formula to obtain the three-phase imbalance simulation verification result; if the simulated three-phase imbalance in the three-phase imbalance simulation verification result does not exceed the preset three-phase balance threshold, the rectification plan is determined to be implemented; if the simulated three-phase imbalance in the three-phase imbalance simulation verification result exceeds the preset three-phase balance threshold, the rectification plan is determined not to be implemented.
[0099] Overload verification can be performed using the following formula: when the three-phase voltage values are all the same (220V) and the phase angle differs by 120 degrees. If the actual load capacity under the transformer substation does not exceed 80% of the substation's rated capacity, the online simulation of the overload problem for that substation has passed, and the relevant work orders pending inspection should be archived.
[0100]
[0101] Three-phase imbalance can be verified using the following formula, where the three-phase voltage values are all the same (220V). When the three-phase imbalance in the transformer area does not exceed 4%, it proves that the online simulation of the three-phase imbalance problem in that area has passed, and the relevant work orders to be inspected are archived:
[0102]
[0103] Where S is the total capacity of the target area; This refers to the voltage of phase A conductor; The current in phase A conductor; This refers to the voltage of phase B conductor; This refers to the current in phase B conductor; This refers to the voltage of phase C conductor; For phase C conductor current; Z A Z represents the impedance value of phase A conductor; B Z represents the impedance value of phase B conductor; C This represents the impedance value of the C-phase conductor.
[0104] In one possible implementation, when the master station receives multiple data feedbacks for the same power quality problem in the same distribution area—that is, when the power quality types in the multiple power quality data are determined to be the same—they are sorted according to the severity of the first type of power quality problem from highest to lowest. A work order for inspection is then created for the most severe first-type power quality problem. The significance of this step is that it allows the master station to prioritize handling the most severe power quality problems, thereby improving processing efficiency, optimizing resource allocation, and avoiding resource waste. Simultaneously, this approach can also respond to and resolve the most severe power quality problems in a timely manner, improving user satisfaction and service quality. Furthermore, through real-time monitoring and analysis of power quality problems, the master station can also prevent faults from occurring and ensure the safe and stable operation of the power grid. Finally, the master station will create a work order for inspection for the most severe first-type power quality problem, so that targeted solutions can be developed subsequently, supporting decision-making and further improving power quality.
[0105] Figure 4 Flowchart of the power quality management system provided in this application Figure 3 ,like Figure 4 As shown, in this embodiment... Figure 1 Based on the implementation example, when the main station receives reports of second-type power quality issues from users, the power quality management system's processing procedure—that is, the process before determining a rectification plan for the second-type power quality issue—is specifically used by the main station for:
[0106] S401. Based on the second type of power quality problem, establish a work order to be inspected corresponding to the second type of power quality problem.
[0107] In this embodiment, in the power system, the second type of power quality problem is a low-voltage fault that causes electrical equipment to malfunction or malfunction. This second type of power quality problem not only affects the normal operation of electrical equipment but may also threaten the stability and reliability of the power system. Therefore, when a second type of power quality problem is detected, a corresponding inspection work order needs to be created immediately. The significance of this step is that it ensures that power quality problems are analyzed and studied in a timely and systematic manner to identify the causes of the problems and take targeted solutions, thereby ensuring the normal operation of the power system and the safety of electrical equipment.
[0108] S402. Calculate the total current value at the beginning of the target transformer area based on the voltage at the beginning and the impedance value of the corresponding phase line.
[0109] In this embodiment, the head-end voltage refers to the head-end voltage of the target transformer area where the Type II power quality problem occurs. Head-end voltage is a crucial parameter in a power system, representing the voltage level at the head end. The impedance value of the corresponding phase line represents the apparent resistance to current flow in the circuit, reflecting the power system's impediment to current transmission. Using the head-end voltage and the impedance value of the corresponding phase line, the total head-end current of the target transformer area can be calculated. This method can assess the load condition of the power system, providing a basis for subsequent voltage verification. By calculating the total head-end current, the load capacity and stability of the power system can be determined, thus providing a scientific basis for developing a rectification plan.
[0110] S403. Calculate the simulated verification voltage value of the low voltage point based on the total current value.
[0111] In this embodiment, after obtaining the total current value at the beginning of the line, the simulated voltage value at the low-voltage point can be calculated based on three principles: voltage division when series current is the same, current division when parallel voltage is the same, and Ohm's law. This method can predict the voltage situation at the low-voltage point, thereby determining whether a rectification plan needs to be implemented. By simulating and verifying the voltage value, the voltage quality of the power system can be assessed to ensure that electrical equipment operates within its normal operating range. If the simulated and verified voltage value is lower or higher than the normal range, it indicates that there is a voltage quality problem in the power system, and corresponding rectification measures need to be taken.
[0112] S404. If the simulated voltage value meets the preset voltage threshold, the rectification plan shall be implemented; if the simulated voltage value does not meet the preset voltage threshold, the rectification plan shall not be implemented.
[0113] In this embodiment, the preset voltage threshold is a standard value set based on the actual situation of the power system and the requirements of the electrical equipment. When the simulated voltage value meets the preset threshold, it indicates that the voltage quality of the power system meets the standard, and no rectification plan is needed. However, when the simulated voltage value does not meet the preset threshold, it indicates that there is a problem with the voltage quality of the power system, and a rectification plan needs to be implemented to improve the voltage quality. This method can ensure that the voltage quality of the power system meets the standard, improving the stability and reliability of the system. At the same time, by implementing the rectification plan, voltage quality problems can be resolved in a timely manner, avoiding damage to electrical equipment.
[0114] Figure 5 A flowchart illustrating the power quality management method of the master station in the power quality management system provided in this application is shown below. Figure 5 As shown, the method includes:
[0115] S501, Power quality issue.
[0116] In this embodiment, the power quality problem includes receiving power quality data sent by the first monitoring terminal, or receiving a second power quality problem reported by the user. The power quality data is sent by the first monitoring terminal when it detects a first power quality problem; the power quality data includes at least the transformer substation number, transformer substation name, power quality type, and occurrence time; the second power quality problem includes low voltage locations.
[0117] S502. Establish work orders to be inspected corresponding to power quality problems; determine rectification plans to solve power quality problems based on the work orders to be inspected.
[0118] S503. Based on the rectification plan, obtain the corresponding rectification data; based on the rectification data, update the line topology map of the target transformer area.
[0119] In this embodiment, the line topology map is obtained in advance by surveying the low-voltage power distribution lines of the target transformer area.
[0120] S504. Send a first data acquisition command to the first monitoring terminal so that the first monitoring terminal sends a second data acquisition command to the second monitoring terminal.
[0121] In this embodiment, the first data acquisition instruction includes the target substation number, the target substation name, the power quality type, and the occurrence time; the second data acquisition instruction includes the power quality type and the occurrence time.
[0122] S505: Receive power data sent by the first monitoring terminal; based on the power data and the line topology diagram, verify the rectification plan for the power quality problem and obtain the verification result; determine the rectification plan for the power quality problem based on the verification result.
[0123] In this embodiment, the power data is acquired by the second monitoring terminal according to the power quality type and occurrence time in the first data acquisition instruction and sent to the first monitoring terminal. The power data includes at least the impedance naming number and the acquired impedance value.
[0124] In one possible implementation, the first monitoring terminal receives a data acquisition command sent by the master station. The data acquisition command includes the target transformer area number, target transformer area name, power quality type, and occurrence time. The first monitoring terminal then sends the first data acquisition command to the second monitoring terminal, which receives the power data sent by the second monitoring terminal. The power data is acquired by the second monitoring terminal based on the power quality type and occurrence time, and includes at least the impedance naming number and the acquired impedance value. The power data is then sent to the master station, enabling the master station to verify the rectification effect of the power quality problem based on the power data and the line topology diagram, obtain the verification result, and determine the rectification plan for the power quality problem based on the verification result.
[0125] In one possible implementation, the second monitoring terminal receives a data acquisition command sent by the first monitoring terminal. The data acquisition command includes the power quality type and the occurrence time. The data acquisition command is sent by the first monitoring terminal after receiving the data acquisition command from the master station. Further, the second monitoring terminal sends power data to the first monitoring terminal. The power data is acquired by the second monitoring terminal based on the power quality type and the occurrence time, and the power data includes at least the impedance naming number and the acquired impedance value. This enables the first monitoring terminal to send the power data to the master station, allowing the master station to verify the rectification effect of the power quality problem based on the power data and the line topology diagram, obtain the verification result, and determine the rectification plan for the power quality problem based on the verification result.
[0126] The power quality management system provided in this application embodiment enables efficient verification and optimized implementation of power quality problem rectification plans. The system consists of a main station, a first monitoring terminal for the target transformer area, and a second monitoring terminal at the low-voltage down-line. The main station updates the transformer area's line topology map based on the acquired rectification plan and issues a data acquisition command. This command is transmitted via the first monitoring terminal to the second monitoring terminal, triggering it to acquire preset frozen power data and forming a data feedback link back to the main station. The main station combines the power data and topology map information to accurately verify the rectification plan, thereby deciding whether to implement it. This process significantly improves the feasibility and execution efficiency of the rectification plan, ensuring the accuracy and real-time nature of power quality management.
[0127] Figure 6 A hardware schematic diagram of the power quality management system provided in this application. Figure 6 As shown, the electronic device 60 provided in this embodiment includes at least one processor 601 and a memory 602. Optionally, the device 60 further includes a communication component 603. The processor 601, memory 602, and communication component 603 are connected via a bus 604.
[0128] In a specific implementation, at least one processor 601 executes computer execution instructions stored in memory 602, causing at least one processor 601 to perform the above-described method.
[0129] The specific implementation process of processor 601 can be found in the above method embodiments, and its implementation principle and technical effect are similar. It will not be repeated here.
[0130] In the above embodiments, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor.
[0131] The memory may include random access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage device.
[0132] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, the buses shown in the accompanying drawings are not limited to a single bus or a single type of bus.
[0133] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method.
[0134] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the above-described method.
[0135] The aforementioned readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium can be any available medium accessible to a general-purpose or special-purpose computer.
[0136] An exemplary readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can reside in an Application Specific Integrated Circuit (ASIC). Alternatively, the processor and the readable storage medium can exist as discrete components in the device.
[0137] The division of units is merely a logical functional division; in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, methods, or units, and may be electrical, mechanical, or other forms.
[0138] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.
[0139] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.
[0140] If a function is implemented as 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 technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.
[0141] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.
[0142] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.
Claims
1. A power quality management system, characterized in that, The system includes: a main station, a first monitoring terminal set up in the target transformer area, and a second monitoring terminal set up on the low-voltage down conductor in the target transformer area; The main station is used to update the line topology map of the target transformer area based on the rectification plan for the power quality problem obtained, and to send a data acquisition command to the first monitoring terminal; wherein, the line topology map is obtained in advance by surveying the low-voltage distribution lines of the target transformer area; The first monitoring terminal is used to send the data acquisition command to the second monitoring terminal; The second monitoring terminal is used to acquire pre-frozen power data according to the data acquisition instruction, and send the power data to the first monitoring terminal; The first monitoring terminal is also used to send the power data to the main station; The main station is also used to verify the rectification plan for the power quality problem based on the power data and the line topology diagram, so as to determine whether to implement the rectification plan.
2. The system according to claim 1, characterized in that, The main station is specifically used for: The impedance value in the line topology diagram is simulated and calculated based on the power data to obtain the simulation verification result corresponding to the rectification plan; the implementation of the rectification plan is determined based on the simulation verification result.
3. The system according to claim 2, characterized in that, The first monitoring terminal is also used to send a load data value freeze command to the second monitoring terminal and send power quality data to the master station when a first type of power quality problem is detected. The second monitoring terminal is also used to freeze the currently collected power data according to the load data value freeze command. The power data includes at least the power quality type, occurrence time and impedance value of the current transformer area. The main station is also used to establish a work order to be inspected corresponding to the power quality data based on the power quality data; and to determine a rectification plan for the first type of power quality problem based on the work order to be inspected.
4. The system according to claim 3, characterized in that, The first type of power quality problem includes heavy overload problems and three-phase imbalance problems; the first monitoring terminal is specifically used for: When the load capacity of the target transformer area calculated according to the heavy overload test formula exceeds the preset heavy overload threshold, the heavy overload problem is determined to have occurred. When the three-phase imbalance degree of the target transformer area calculated according to the three-phase imbalance degree test formula exceeds the preset three-phase imbalance degree threshold, the three-phase imbalance problem is determined to have occurred.
5. The system according to claim 3, characterized in that, When determining a rectification plan for the first type of power quality problem based on the work order to be inspected, the main station is specifically used for: Based on the work order to be inspected, at least one of the following is identified as the rectification plan corresponding to the first type of power quality problem: load cut-off, replacement of low-voltage conductors, and replacement of distribution transformer.
6. The system according to claim 1, characterized in that, The main station is also used for: receiving second-type power quality problems reported by users; establishing a work order to be inspected corresponding to the second-type power quality problem; and determining a rectification plan for the second-type power quality problem based on the work order to be inspected.
7. The system according to claim 4, characterized in that, When the first type of power quality problem is a severe overload problem, the master station is specifically used for: The impedance value in the line topology diagram is calculated based on the overload test formula to obtain the overload simulation test result. If the simulated load capacity in the heavy overload simulation verification result does not exceed the preset heavy overload threshold, the rectification plan will be implemented. If the simulated load capacity in the heavy overload simulation verification results exceeds the preset heavy overload threshold, it is determined that the rectification plan will not be implemented.
8. The system according to claim 4, characterized in that, When the first type of power quality problem is a three-phase imbalance problem, the master station is specifically used for: Based on the three-phase unbalance test formula, the impedance value in the line topology diagram is calculated to obtain the three-phase unbalance simulation verification result. If the simulated three-phase imbalance in the three-phase imbalance simulation verification result does not exceed the preset three-phase balance threshold, the rectification plan will be implemented. If the simulated three-phase imbalance in the three-phase imbalance simulation verification result exceeds the preset three-phase balance threshold, it is determined that the rectification plan will not be implemented.
9. The system according to claim 6, characterized in that, Upon receiving a second type of power quality problem, the master station is specifically used for: The total current value at the beginning of the target transformer area is calculated based on the voltage at the beginning of the transformer and the impedance value of the corresponding phase line; the voltage at the beginning of the target transformer area where the second type of power quality problem occurs is the voltage at the beginning of the transformer. Calculate the simulated verification voltage value of the low-voltage point based on the total current value; When the simulated verification voltage value meets the preset voltage value threshold, the rectification plan is determined to be implemented. If the simulated verification voltage value does not meet the preset threshold value, it is determined that the rectification plan will not be implemented.
10. The system according to claim 3, characterized in that, Upon receiving multiple power quality data points, the master station is also configured to: When it is determined that the power quality types in the multiple power quality data are the same, they are sorted from high to low according to the severity of the first type of power quality problem; The inspection work order is created for the first type of power quality problem with the highest severity.