Angular-difference closed-loop power regulation setting and risk checking method and system for power distribution network
By constructing a full-voltage-level power grid model and calculating the loop current, and setting the loop unblocking point and backup loop unblocking point, the problem of phase angle difference loop regulation in the distribution network is solved, enabling power outage-free operation and improving power supply reliability and the accuracy of risk verification.
Patent Information
- Application Number
- CN202511478362.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-16
- Publication Date
- 2026-01-23
AI Technical Summary
When load is adjusted in a loop on interconnecting lines with phase angle differences in a distribution network, it can easily cause both lines to trip simultaneously, resulting in short-term power outages, affecting power supply reliability, and frequent load adjustments without power can lead to economic losses and user complaints.
By constructing a power grid model covering all voltage levels, calculating the loop current and performing risk verification, setting the loop unblocking point and backup loop unblocking point, and setting the loop unblocking protection settings, the feasibility evaluation of loop unblocking power regulation with angle difference and the operation without power outages are realized.
Complete the loop-connected power regulation with angle difference without power outage, improve power supply reliability, reduce economic losses, avoid frequent power outage complaints, simplify on-site operations, and improve the accuracy of power grid risk verification.
Smart Images
Figure CN121395345A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of 10kV distribution network with angle difference closed-loop regulation in power systems, and in particular to a method and system for setting and risk verification of distribution network with angle difference closed-loop regulation. Background Technology
[0002] The statements in this section are merely background information related to this application and do not necessarily constitute prior art.
[0003] In power distribution networks, due to changes in transformer wiring groups within the upstream power supply path, some interconnected distribution lines may have a 30° phase angle difference at the loop closing point. If load adjustment is directly performed on interconnected lines with phase angle differences, the loop closing current will cause both lines to trip simultaneously, and may even affect the upstream power grid. Therefore, load adjustment without power supply can only be performed, which will cause two short-term power outages and affect the reliability of power supply.
[0004] Currently, the interconnection rate of 10kV distribution lines is continuously increasing, and load transfer between them is frequent. Approximately 10% of the 10kV interconnection lines in the distribution network have a 30-degree phase angle difference, while branch interconnection lines with phase angle differences account for an even larger proportion, around 12%. Assuming each pair of interconnection lines performs 5 load transfers per year during power outages, with an average load of 2000kW, an average operation time of 0.5 hours, and an average electricity price of 0.5 yuan / kWh, the economic loss per pair of interconnection lines due to load transfers during power outages is 5 * 2000 * 0.5 * 0.5 = 2500 yuan per year. Furthermore, as users' requirements for power quality continue to increase, two short-term power outages occur during the process of load transfers from power outages to power returns, easily leading to work orders and even frequent power outage complaints.
[0005] Closing loads on interconnecting lines with phase angle differences is a significant challenge currently facing the power distribution industry. There is an urgent need for an operable method for closing loads with phase angle differences to improve the power supply reliability of the distribution network. Summary of the Invention
[0006] Based on this, and in response to the aforementioned technical problems, this application provides a method and system for adjusting and verifying the risk of power distribution network with angle difference loop regulation.
[0007] The technical solution adopted in this application to solve the problems existing in the prior art is: This application proposes a method for setting and verifying the risk of distribution network with angle difference loop regulation, including the following steps: S0: Import power grid diagrams and load data from the power grid dispatch automation system and distribution automation system to form a power grid model for all voltage levels; S1: Obtain the first equivalent impedance of the 10 kV busbar of the substation on one side of the loop closure point. First outgoing switch First equivalent voltage ; Obtain the second equivalent impedance of the 10 kV busbar of the substation on the other side of the loop connection point. Second outgoing switch Second equivalent voltage ; Determine the location of the loop-breaking point; S2: Calculate the closed-loop current using the short-circuit impedance method. : ; S3: Calculate the inrush current of closed-loop power regulation with angle difference using the power flow calculation method. and steady-state current ; S4: Calculation and deviation : like Then proceed to step S5; like If so, return to step S0; S5: Based on the inrush current of the loop-connected current regulation with angle difference and steady-state current This enables risk verification of the power grid and status assessment of loop equipment during loop closure with angle difference, achieving quantitative evaluation of the feasibility of loop closure operation and providing intuitive conclusions for control and operation personnel to carry out loop closure operation; If successful, proceed to step S6; otherwise, adjust the load using a power-off method. S6: Set the temporary protection setting value when the loop is closed at the unloop point.
[0008] Preferably, The loop-breaking point is located at the first outgoing switch. With the second outgoing switch At any other switch between them.
[0009] Preferably, The loop closure point is set as a backup loop unclosure point.
[0010] Preferably, The point where the loop merges is in a separate position before the loop merges.
[0011] Preferably, The closing point is a tie switch.
[0012] Preferably, S6 includes: Obtain the minimum loop current ;like < ,but: Set the loop closure protection setting value at the loop unblocking point. , ∈ ( , The protection action time is 0 seconds; like ≤ Then, after the loop is closed, the unlooping point switch should be manually opened.
[0013] Preferably, S6 includes: Obtain the minimum loop current Set the loop closure protection setting value at the loop unblocking point. ; The protective action time is 0 seconds.
[0014] Preferably, S6 further includes: Set the loop-closing protection setting value for the backup loop-breaking point. , The protective action takes 0.2 seconds.
[0015] A distribution network with angle difference loop regulation setting and risk verification system includes: A power grid model that connects to power grid dispatch automation systems and distribution automation systems; The data acquisition module is used to obtain the first equivalent impedance of the 10 kV busbar of the substation on one side of the loop point from the power grid model. First outgoing switch First equivalent voltage The second equivalent impedance of the 10 kV busbar of the substation on the other side of the loop connection point. Second outgoing switch Second equivalent voltage ; The data processing module is used to calculate the closed-loop current using the short-circuit impedance method on the data acquired by the data acquisition module. Used to calculate the inrush current of closed-loop power regulation with angle difference using power flow calculation methods. and steady-state current ; The data judgment module is used to make judgments. and deviation and in When the surge current is applied and steady-state current Transmitted to the risk verification module; The risk verification module is used to... At that time, based on the impact current of the loop-connected power supply with angle difference and steady-state current , Complete the risk verification of the power grid and the status assessment of the loop equipment when closing the loop with angle difference, realize the quantitative evaluation of the feasibility of the loop closing operation, and provide intuitive conclusions for the control and operation personnel to carry out the loop closing operation; if it passes, the temporary protection setting value at the loop closing point will be adjusted.
[0016] Preferably, it further includes: The temporary protection setting module is used to set temporary protection settings for the loop-breaking point and the backup loop-breaking point.
[0017] Compared with the prior art, the beneficial effects of this application are as follows: The purpose of this application is to complete the loop load adjustment of distribution lines with angle difference without power interruption, including setting calculation and power grid risk verification. This patent application is applicable to live load adjustment between any distribution network main line or branch line with angle difference.
[0018] This patent application, adhering to the principles of "accurate power grid model, precise equipment parameters, simplified setting calculation, and simple on-site operation," constructs a method and system for calculating and verifying the setting of loop-locked power regulation with angle difference in distribution networks. First, a risk verification platform for loop-locked power regulation based on a smart digital cloud power grid is deployed in the power grid's production control area. This platform integrates data from dispatch automation and distribution automation systems, including graphical archives and telemetry and telecontrol data, forming a real-time data warehouse covering all voltage levels, encompassing power grid models, equipment parameters, and real-time data. This system allows for online calculation and conclusions of loop-locking and unlocking operations under specified conditions, including calculations of the main and distribution integrated loop power flow, steady-state current, and inrush current. Second, it provides an accurate and convenient method for calculating short-circuit impedance, enabling simple and rapid calculation of the loop-locking current with angle difference. Third, it provides a simplified principle for calculating the unlocking point setting. After calculating the loop-locking current, appropriate temporary protection settings are set at the unlocking point, achieving "manual loop-locking and protection-based loop-locking." Fourth, a "backup loop-breaking point" is set up, which delays action when the loop-breaking point protection fails or the switch fails to operate, to avoid cascading tripping. Fifth, the one-click download function of distribution network settings is applied to achieve quick, accurate and convenient modification of field settings. Attached Figure Description
[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.
[0020] Figure 1 This is a block diagram illustrating the components of a closed-loop power regulation risk verification platform based on a smart digital cloud power grid, as described in one embodiment of this application. Figure 2 This is a loop diagram illustrating the calculation of the loop current in one embodiment of this application. Figure 3 for Figure 2 Schematic diagram of the middle loop impedance. Figure 4 This is a flowchart of the distribution network with angle difference loop power regulation in one embodiment of this application. Detailed Implementation
[0021] The present application will be further described below with reference to the accompanying drawings and embodiments.
[0022] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this disclosure. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0023] In this disclosure, terms such as "upper," "lower," "left," "right," "front," "back," "vertical," "horizontal," "side," and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are merely relational terms determined for the convenience of describing the structural relationship of the various components or elements in this disclosure, and do not specifically refer to any component or element in this disclosure, nor should they be construed as limiting this disclosure.
[0024] This application provides a method for setting and verifying the risk of power distribution network with angle difference loop regulation, including the following steps: S0: Import power grid diagrams and load data from the power grid dispatch automation system and distribution automation system to form a power grid model covering all voltage levels; specifically, refer to... Figure 1 In the power grid's production control area, in conjunction with the construction of a smart digital cloud power grid, a closed-loop power dispatch risk verification platform is deployed. Power grid diagrams and load data are imported from the dispatch automation system and distribution automation system to form a power grid model for all voltage levels.
[0025] S1: Obtain the first equivalent impedance of the 10 kV busbar of the substation on one side of the loop closure point. First outgoing switch First equivalent voltage ; Obtain the second equivalent impedance of the 10 kV busbar of the substation on the other side of the loop connection point. Second outgoing switch Second equivalent voltage ; Determine the location of the loop-breaking point; That is: collect the equivalent impedance of the 10 kV busbars of the substations on both sides of the loop closure point, and the distribution network line parameters from the loop closure point to the 10 kV busbars of the substations, and establish a loop power dispatching model; the definitions of the loop closure point, the loop unclosure point, and the backup loop unclosure point are as follows: Figure 2 As shown, the closed-loop power regulation model is generalized, equipment parameters are added, and complete and accurate closed-loop path topology and parameter information are established. S2: Reference Figure 3 The loop current is calculated using the short-circuit impedance method. : ; It should be noted that this application uses an angle difference of 30° as an example for calculation, and adjustments can be made according to actual needs in practical applications; S3: Calculate the inrush current of closed-loop power regulation with angle difference using the power flow calculation method. and steady-state current ; S4: Calculation and deviation : like Then proceed to step S5; like If so, return to step S0; S5: Based on the inrush current of the loop-connected current regulation with angle difference and steady-state current This enables risk verification of the power grid and status assessment of loop equipment during loop closure with angle difference, achieving quantitative evaluation of the feasibility of loop closure operation and providing intuitive conclusions for control and operation personnel to carry out loop closure operation; If successful, proceed to step S6; otherwise, proceed to the power-off method, i.e., adjust the load after power is cut off. S6: Set the temporary protection setting value when the loop is closed at the unloop point.
[0026] In some embodiments, the unlooping point is located at the first outgoing switch. With the second outgoing switch At any other switch between them.
[0027] In some embodiments, the loop closure point is set as a backup unloop closure point, and the loop closure point is in a vacancy position before the loop is closed.
[0028] In some embodiments, the closing point is a handshake switch.
[0029] In some embodiments, step S6 includes the following: Obtain the minimum loop current ;like < ,but: Set the loop closure protection setting value at the loop unblocking point. , ∈ ( , The protection action time is 0 seconds; like ≤ Then, after the loop is closed, the unlooping point switch should be manually opened.
[0030] In other embodiments, step S6 is: Obtain the minimum loop current Set the loop closure protection setting value at the loop unblocking point. ; The protective action time is 0 seconds.
[0031] In some embodiments, S6 further includes: Set the loop-closing protection setting value for the backup loop-breaking point. , The protective action takes 0.2 seconds.
[0032] refer to Figure 4 This is a flowchart of a distribution network with angle difference loop-locked power regulation in one embodiment of this application. After completing step S6, the distribution network with angle difference loop-locked power regulation further includes the following steps: S7: Input the closing protection setting value into another setting zone at the loop-breaking point and standby loop-breaking point switch protection device, and put it into operation through the one-click download function of distribution network setting; When a distribution network needs to switch from open-loop to closed-loop operation, protection settings must be adjusted to avoid malfunctions. Protection devices can store multiple sets of settings in a storage area for switching between different operating modes or fault scenarios. This operation allows for advance preparation of settings and rapid switching via automated tools such as distribution network dispatching systems, reducing the risk of manual operation and improving power supply reliability. In protection devices at grid disconnection / standby disconnection points, the protection settings required for closed-loop operation are pre-stored in another setting area (not the current operating area). Subsequently, the "one-click download" function of the distribution network automation system quickly downloads the new settings to the device and activates it, putting it into operation. The goal is to efficiently and safely switch protection settings to adapt to the needs of grid closed-loop operation. S8: Manually remotely control the loop closing switch to close the loop; S9: If the temporary protection of the loop disconnection point operates and the loop is successfully disconnected, the load transfer will be successful without power interruption; if the loop disconnection point switch does not operate and the standby loop disconnection point switch trips, the operating mode before power adjustment will be restored. Power adjustment will be carried out by adjusting the load without power, and the reasons for the failure of the loop disconnection point to operate and the operation of the standby loop disconnection point will be further investigated. S10: Use the one-click download function of the distribution network setting to restore the normal protection setting.
[0033] This application also provides a distribution network with angle difference loop-loop regulation setting and risk verification system, based on the above-mentioned distribution network with angle difference loop-loop regulation setting and risk verification method, including: A power grid model that connects to power grid dispatch automation systems and distribution automation systems; The data acquisition module is used to obtain the first equivalent impedance of the 10 kV busbar of the substation on one side of the loop point from the power grid model. First outgoing switch First equivalent voltage The second equivalent impedance of the 10 kV busbar of the substation on the other side of the loop connection point. Second outgoing switch Second equivalent voltage ; The data processing module is used to calculate the closed-loop current using the short-circuit impedance method on the data acquired by the data acquisition module. Used to calculate the inrush current of closed-loop power regulation with angle difference using power flow calculation methods. and steady-state current ; The data judgment module is used to make judgments. and deviation and in When the surge current is applied and steady-state current Transmitted to the risk verification module; The risk verification module is used to... At that time, based on the impact current of the loop-connected power supply with angle difference and steady-state current , Complete the risk verification of the power grid and the condition assessment of the loop equipment when closing the loop with angle difference, realize the quantitative evaluation of the feasibility of the loop closing operation, and provide intuitive conclusions for the control and operation personnel to carry out the loop closing operation; if it passes, the temporary protection settings at the loop closing point will be adjusted. The temporary protection setting module is used to set temporary protection settings for the loop-breaking point and the backup loop-breaking point.
[0034] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
[0035] While the specific embodiments of this application have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of this application. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of this application are still within the scope of protection of this application.
Claims
1. A power distribution network with angle difference loop closing power adjustment setting and risk checking method, characterized in that: It comprises the following steps: S0: Import the power grid model and load data from the power grid dispatching automation system and the power distribution automation system to form a full voltage level power grid model; S1: obtaining the first equivalent impedance of the 10-kilovolt bus of the substation on the closing point side , the first outgoing line switch , the first equivalent voltage ; acquire the second equivalent impedance of the 10kv bus of the substation on the other side of the closing point , the second outgoing line switch , the second equivalent voltage ; Determine the location of the loop breaking point; S2: Calculate the loop current by using short circuit impedance method : ； S3: use the power flow calculation method to calculate the impact current of the loop regulation power with angle difference and steady-state current ; S4: Calculate With deviation : If then go to step S5; If then return to step S0; S5: Impulse current of closing loop with angle difference and steady-state current , complete the risk check of power grid and the state evaluation of loop equipment when closing loop with angle difference, realize the quantitative evaluation of the feasibility of closing loop operation, and provide intuitive conclusion for the closing loop operation of the operation personnel. If it passes, go to step S6; otherwise, adjust the load by non-electricity method; S6: Set the temporary protection setting value when the loop breaking point is closed.
2. The power distribution network with angle difference loop closing power adjustment setting and risk checking method according to claim 1, characterized in that: The decoupling point is at any other switch between the first outgoing switch and the second outgoing switch .
3. The power distribution network with angle difference loop closing power adjustment setting and risk checking method according to claim 2, characterized in that: The loop closing point is set as a backup loop breaking point.
4. The power distribution network with angle difference loop closing power adjustment setting and risk checking method according to claim 1, characterized in that: The loop closing point is in a split position before closing.
5. The power distribution network with angle difference loop closing power adjustment setting and risk checking method according to claim 4, characterized in that: The loop closing point is a tie switch.
6. The power distribution network with angle difference loop closing power adjustment setting and risk checking method according to claim 1, characterized in that: S6 comprises: Obtaining minimum hoop current ; if < then: Setting the reclosing point of the loop protection value , ∈( , ), the protection action time is 0 seconds; If ≤ , then the artificial pull open the release point switch after the ring.
7. The power distribution network with angle difference loop closing power adjustment setting and risk checking method according to claim 1, characterized in that: S6 comprises: Obtaining minimum loop current ; setting loop protection setting value of loop breaking point ; , the protection action time is 0 seconds.
8. The power distribution network with angle difference loop closing power adjustment setting and risk checking method according to any one of claims 6 or 7, characterized in that: S6 further comprises: Setting a loopback protection threshold value for a backup loopback point , , the protection action time is 0.2 seconds.
9. A power distribution network with angle difference loop closing power adjustment setting and risk checking system based on the power distribution network with angle difference loop closing power adjustment setting and risk checking method according to any one of the above claims, characterized in that: It comprises: A power grid model connected to the power grid dispatching automation system and the power distribution automation system; The data acquisition module is configured to acquire the first equivalent impedance of the 10-kilovolt bus of the substation on the loop-through point side from the power grid model , the first outgoing line switch , the first equivalent voltage ; second equivalent impedance of the other side of the transformer substation 10 kV bus , second outgoing line switch , second equivalent voltage ; The data processing module is used for calculating the loop current by using the short-circuit impedance method on the data acquired by the data acquisition module ; Method for calculating the inrush current of a looped power supply with angle difference using a power flow calculation and steady state current ; Data judging module, for judging deviation of , and transmitting impact current and steady-state current to risk checking module when ; a risk checking module for checking the risk of an impact current and a steady state current at the time of closing the loop according to the phase angle difference Complete the risk checking of the power grid and the state evaluation of the loop equipment when closing the loop with angle difference, realize the quantitative evaluation of the feasibility of loop closing operation, and provide intuitive conclusion for the loop closing operation of the control and operation personnel; If it passes, set the temporary protection setting value when the loop breaking point is closed.
10. The power distribution network with angle difference loop closing power adjustment setting and risk checking system according to claim 9, characterized in that: It further comprises: A temporary protection setting value setting module for setting temporary protection setting values for the loop breaking point and the backup loop breaking point.