CN-122026302-A - Power distribution network transient process accurate modeling and switching operation optimization method, system, equipment and medium

CN122026302ACN 122026302 ACN122026302 ACN 122026302ACN-122026302-A

Abstract

The invention discloses a method, a system, equipment and a medium for optimizing transient process accurate modeling and switching operation of a power distribution network, which belong to the technical field of power systems and automation and comprise the steps of collecting real-time data and evaluating running states, constructing a transient simulation model containing high fidelity, carrying out parameter identification based on historical data, simulating different switching operations by using the model to obtain transient process data, establishing a multi-objective optimization model aiming at minimizing transient impact and optimizing switching sequence, solving a pareto optimal solution set by using an intelligent algorithm and giving a configuration scheme, realizing quasi-real-time simulation by adopting parallel computing and model order reduction technology, verifying scheme feasibility by a pre-modeling system before actual operation, generating an operation instruction, carrying out real-time monitoring and comparing with simulation results, and starting emergency adjustment according to deviation. The invention realizes closed-loop control from accurate modeling, optimal decision making, previewing verification to real-time feedback, and improves the safety and stability of switching operation of the power distribution network.

Inventors

LI QINGSHENG
WANG WEI
ZHANG ZHAOFENG
YANG JIERUI
PANG HAIDONG
YANG SHUNJI
CHEN JULONG
LONG JIAHUAN
ZHANG YU
LI ZHEN
AO JUN
XU YUTAO
LIU HENG
ZHANG SHA

Assignees

贵州电网有限责任公司

Dates

Publication Date: 20260512
Application Date: 20251205

Claims (10)

1. The power distribution network transient process accurate modeling and switching operation optimizing method is characterized by comprising the following steps of, Collecting real-time operation data of the power distribution network through the SCADA system, constructing a current operation state vector, identifying a current network topology structure, and evaluating whether the current operation state meets normal operation constraint; carrying out parameter identification by modeling transient characteristics of power distribution network type elements, and constructing a high-fidelity power distribution network transient simulation model; performing simulation calculation by using the established transient simulation model to form complete transient process data for coupling analysis; Based on a transient simulation result, a switching strategy multi-objective optimization model is established, a pareto optimal solution set is solved, a feasible scheme is provided, and a configuration scheme is optimized; accelerating transient simulation by adopting a parallel computing technology, evaluating the accelerating effect of parallel computing, optimizing computing task allocation, and carrying out self-adaptive adjustment; before the actual switching operation is executed, starting a previewing system to carry out final verification, calculating a comprehensive evaluation score, and judging whether the scheme is acceptable or not; When the switching operation is actually executed, the transient process is monitored in real time and compared with the simulation prediction result, and the model precision is optimized.
2. The method for optimizing the transient process accurate modeling and switching operation of the power distribution network of claim 1, wherein whether the normal operation constraint is met or not comprises the steps of collecting real-time operation data of the power distribution network through a SCADA system, constructing a current operation state vector, and correcting a measurement error through a state estimation algorithm; identifying the current network topology structure, and judging the position of a power supply point, load distribution and switching state; Calculating the voltage level of each node, and evaluating whether the current running state meets the normal running constraint; for a handover operation to be performed, the handover type is analyzed and a transient phenomenon of interest is determined.
3. The method for optimizing the transient process precision modeling and switching operation of the power distribution network of claim 2, wherein the constructing the transient simulation model of the power distribution network with high fidelity comprises the steps of establishing a circuit distribution parameter model and a transformer hysteresis characteristic model according to a power distribution network topological structure and equipment parameters, and identifying model parameters through historical operation data; The load side builds a dynamic model of the asynchronous motor, determines model parameters, and adopts a combined model for static load; and correcting model parameters based on historical transient recording data through a parameter identification algorithm, and establishing a complete transient simulation model of the power distribution network.
4. The method for optimizing the transient process precision modeling and switching operation of the power distribution network of claim 3, wherein the simulating calculation comprises setting different switching moments and switching sequences for planned switching operation, and performing the simulating calculation by using the established transient model; For no-load line investment, analyzing traveling wave propagation process and oscillation characteristics; for capacitor bank switching, analyzing transient processes under different switching phase angles; for heavy load transfer, analyzing the influence of load dynamic response on system stability; and recording key parameters in the simulation process to form complete transient process data.
5. The method for accurately modeling and optimizing switching operation of a power distribution network transient process of claim 4, wherein the providing a feasible scheme comprises the steps of establishing a switching strategy multi-objective optimization model based on a transient simulation result, optimizing switching time, and selecting a phase angle for minimizing transient impact; establishing a switching sequence optimization model, and comprehensively considering multiple targets of overvoltage, surge and switching time; A genetic algorithm or a particle swarm algorithm is used for solving the pareto optimal solution set, and a feasible scheme is provided; for each feasible scheme, calculating a comprehensive evaluation score, and sequencing the preferred recommended scheme; For schemes with evaluation scores lower than a threshold value, designing pre-control measures for improvement; and calculating optimal parameters of devices of the pre-control resistor and the reactor, and optimizing a configuration scheme.
6. The method for optimizing power distribution network transient process accurate modeling and switching operation of claim 5, wherein accelerating transient simulation comprises accelerating transient simulation by adopting parallel computing technology; evaluating the acceleration effect of parallel computing, and optimizing the computing task distribution; a model order reduction method is adopted, a calculation model is simplified on the premise of ensuring the accuracy, and the calculation speed is accelerated; Performing quasi-real-time calculation of the transient process, wherein the calculation time is controlled at a minute level; and when the running state of the power grid changes, recalculating the optimization scheme and carrying out self-adaptive adjustment.
7. The method for optimizing transient process precision modeling and switching operations of a power distribution network of claim 6, wherein said starting a previewing system for final verification comprises starting the previewing system for final verification prior to performing an actual switching operation; inputting the optimized switching scheme into a simulation system to simulate a transient process; checking whether the voltage and the current in the simulation result meet constraint conditions or not, and verifying all constraints; calculating a comprehensive evaluation score, judging whether the scheme is acceptable, and when the scheme is not acceptable, previewing the found problem, returning to an optimization stage to recalculate the scheme; if the previewing is passed, generating an operation instruction sequence comprising the operation time, the operation sequence and the configuration of the previewing measures of each switch; when the switching operation is actually executed, the transient process is monitored in real time, the voltage and current waveforms are recorded through a high-speed sampling device, and the voltage and current waveforms are compared with the simulation prediction result; if the actual transient process has deviation from the predicted result, starting an emergency treatment program, and stopping the operation; After switching is completed, transient recording data are analyzed, a switching effect is evaluated, actual operation data are fed back to perform parameter identification, and model accuracy is continuously optimized; and (5) statistically analyzing indexes of switching success rate, transient impact level and equipment stress, and evaluating the overall performance.
8. The power distribution network transient process accurate modeling and switching operation optimizing system is applied to the power distribution network transient process accurate modeling and switching operation optimizing method according to any one of claims 1-7, and is characterized by comprising a data acquisition and state identification module, a power distribution network real-time operation module, a current operation state vector is constructed by acquiring power distribution network real-time operation data through a SCADA system, a current network topological structure is identified, and whether the current operation state meets normal operation constraint is evaluated; the transient model construction and parameter identification module is used for carrying out parameter identification by modeling transient characteristics of power distribution network type elements and constructing a high-fidelity power distribution network transient simulation model; the transient process simulation analysis module is used for performing simulation calculation by using the established transient simulation model to form complete transient process data for coupling analysis; The switching strategy multi-objective optimization module is used for establishing a switching strategy multi-objective optimization model based on a transient simulation result, solving the pareto optimal solution set, providing a feasible scheme and optimizing a configuration scheme; the rapid calculation and real-time decision module adopts a parallel calculation technology to accelerate transient simulation, evaluates the acceleration effect of parallel calculation, optimizes calculation task allocation and carries out self-adaptive adjustment; the switching operation previewing verification module starts a previewing system to carry out final verification before the actual switching operation is executed, calculates a comprehensive evaluation score and judges whether the scheme is acceptable; And the monitoring and effect evaluation module is used for comparing the real-time monitoring transient process with the simulation prediction result and optimizing the model precision when the switching operation is actually executed.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of a method for optimizing the transient modeling and switching operations of a power distribution network according to any one of claims 1 to 7.
10. A computer readable storage medium having stored thereon a computer program, which when executed by a processor performs the steps of a method for optimizing the transient modeling and switching operations of a power distribution network according to any of claims 1 to 7.

Description

Power distribution network transient process accurate modeling and switching operation optimization method, system, equipment and medium Technical Field The invention relates to the technical field of power systems and automation, in particular to a method, a system, equipment and a medium for optimizing accurate modeling and switching operation of a transient process of a power distribution network. Background With the continuous expansion of the power distribution network scale and the increasing complexity of the operation mode, the switching operation has become one of the most frequent operations in the daily operation and maintenance of the power distribution network. However, the conventional switching control method is mainly based on steady-state analysis, and researches and control on transient processes are seriously insufficient, so that various problems frequently occur in actual operation. The traditional switching control depends on experience judgment of a dispatcher, quantitative analysis on a transient process is lacking, and transient phenomena such as overvoltage and inrush current possibly caused by switching operation are difficult to accurately predict. Disclosure of Invention The present invention has been made in view of the above-described problems. Therefore, the method aims to solve the technical problems of low modeling precision, missing optimization strategies and the like in the transient process of the switching operation of the power distribution network. In order to solve the technical problems, the invention provides a method for optimizing the transient process accurate modeling and switching operation of a power distribution network, which comprises the following steps, The method comprises the steps of collecting real-time operation data of a power distribution network through a SCADA system, constructing a current operation state vector, identifying a current network topological structure, evaluating whether the current operation state meets normal operation constraint, carrying out parameter identification through modeling transient characteristics of power distribution network elements, constructing a high-fidelity power distribution network transient simulation model, carrying out simulation calculation through the established transient simulation model to form complete transient process data for coupling analysis, establishing a switching strategy multi-objective optimization model based on transient simulation results, solving a pareto optimal solution set, providing a feasible scheme, optimizing a configuration scheme, accelerating transient simulation by adopting a parallel computing technology, evaluating acceleration effect of parallel computation, optimizing calculation task distribution, carrying out self-adaptive adjustment, starting a pre-modeling system for final verification, calculating comprehensive evaluation scores, judging whether the scheme is acceptable or not, and comparing a real-time monitoring transient process with a simulation prediction result when the switching operation is actually executed, and optimizing model accuracy. The invention relates to a power distribution network transient process accurate modeling and switching operation optimization method, which comprises the steps of collecting real-time operation data of a power distribution network through a SCADA system, constructing a current operation state vector, and correcting measurement errors through a state estimation algorithm; identifying the current network topology structure, and judging the position of a power supply point, load distribution and switching state; Calculating the voltage level of each node, and evaluating whether the current running state meets the normal running constraint; for a handover operation to be performed, the handover type is analyzed and a transient phenomenon of interest is determined. The method for accurately modeling and optimizing the switching operation of the transient process of the power distribution network comprises the steps of constructing a transient simulation model of the power distribution network with high fidelity, constructing a circuit distribution parameter model and a hysteresis characteristic model of a transformer according to a topological structure and equipment parameters of the power distribution network, and identifying model parameters through historical operation data; The load side builds a dynamic model of the asynchronous motor, determines model parameters, and adopts a combined model for static load; and correcting model parameters based on historical transient recording data through a parameter identification algorithm, and establishing a complete transient simulation model of the power distribution network. As a preferable scheme of the power distribution network transient process accurate modeling and switching operation optimizing method, the invention comprises the following steps: the simulation calculat