CN-116191451-B - Static reactive compensator constant volume and location method based on electromagnetic transient simulation

Abstract

The invention relates to the field of power system planning, in particular to a static reactive compensator volume-fixing and address-selecting method based on electromagnetic transient simulation, which comprises the steps of randomly generating P simulation scenes and P speed vectors; the method comprises the steps of carrying out electromagnetic transient simulation solution on each simulation scene to obtain an electromagnetic transient simulation result, calculating an optimization target of each scene based on the electromagnetic transient simulation result, repeating the step S2 until P simulation scenes are traversed, selecting a historical optimal solution and all global optimal solutions of each simulation scene in an iterative process, updating a speed value vector of each scene, calculating and updating a static reactive compensator capacity configuration scheme of each scene based on the updated speed value vector, and repeating the steps S2-S4 until iteration converges to obtain a final static reactive compensator configuration scheme. The invention can comprehensively consider the economical efficiency and the stability of the power system, find the bus position most suitable for newly-built static reactive power compensator, and provide an optimized strategy scheme for reactive voltage support of the system.

Inventors

• WANG YONG
• CUI YIPING
• LIU JUNXIANG
• ZHANG YIDI
• LUO SIMIN
• ZHOU KAI
• XU SHUO
• FAN XUJUAN
• YANG JUE
• CHEN JUN
• CHEN YAN
• WANG HONGBIN
• ZHANG XIANCONG
• HUANG QINGDAN
• CHEN YILONG
• XU ZHONG
• PENG HEPING
• ZHENG XIN
• Gu Dade
• KONG LINGMING

Assignees

• 广东电网有限责任公司广州供电局

Dates

Publication Date

20260508

Application Date

20221206

Claims (6)

1. 1. A static reactive compensator constant volume site selection method based on electromagnetic transient simulation is characterized by comprising the following steps: s1, randomly generating P simulation scenes and P speed vectors, wherein each simulation scene corresponds to a configuration scheme of a static reactive power compensator; S2, carrying out electromagnetic transient simulation solution on each simulation scene to obtain an electromagnetic transient simulation result, setting an optimization target of the scene according to the fault severity index of the system, and calculating the optimization target of each scene based on the electromagnetic transient simulation result; function of the optimization objective The method comprises the following steps: ; wherein, the system is provided with M buses, Epsilon is a preset value, A is a constant, For static var compensator capacity deployed at bus j, The cost required for deploying a static var compensator of unit capacity at the jth busbar, ε is 0.05; s3, repeating the step S2 until P simulation scenes are traversed, and selecting a local optimal solution and all global optimal solutions of each simulation scene in the iterative process; S4, updating the speed value vector of each scene, and calculating and updating the capacity configuration scheme of the static var compensator of each scene based on the updated speed value vector; And S5, repeating the steps S2-S4 until iteration converges to obtain a locally optimal configuration scheme on each bus, and determining a final global constant-volume and address selection scheme of the static var compensator.
2. 2. The method for sizing and locating a static var compensator based on electromagnetic transient simulation according to claim 1, wherein the step S1 comprises the steps of adding M buses for adding the static var compensator alternatively, marking the configuration scheme of the static var compensator as Q, ; Wherein Q1, Q2,..qm is the static var compensator capacity added by each of the M bus bars.
3. 3. The static var compensator capacity-fixing and site-selection method based on electromagnetic transient simulation according to claim 1 is characterized in that the setting of the optimization targets of the scene according to the fault severity index of the system comprises the steps that when the fault severity index of the system is smaller than or equal to a preset value, the optimization targets of the scene are total investment cost, and when the fault severity index of the system is larger than the preset value, the optimization targets of the scene are the total investment cost and the comprehensive value of the fault severity index.
4. 4. A static var compensator sizing method based on electromagnetic transient simulation according to claim 3, wherein the fault severity index of the system can be calculated by the following formula: ; wherein the system is provided with N buses, As an index of the severity of the failure of the system, S i (Q, T) is the fault severity index of the ith bus at the time T, and T is the simulation total time after fault clearing.
5. 5. The static var compensator sizing and locating method based on electromagnetic transient simulation according to claim 4, wherein the calculation formula of the velocity value vector is as follows: ; Wherein, the For the speed value of the p-th scene at the kth iteration, Is the local optimal solution of the p-th scene after the kth iteration, alpha and beta are random numbers between 0 and 1, omega is a speed attenuation factor between 0 and 1, c1 and c2 are learning factors, c1=c2=2, And (5) iterating the electromagnetic transient simulation result of the p simulation scene reaching the kth time.
6. 6. The static var compensator capacity allocation method based on electromagnetic transient simulation according to claim 5, wherein the calculation formula for calculating and updating the static var compensator capacity allocation scheme of each scene based on the updated speed value vector is as follows: ; Wherein, the For the configuration scheme of the k+1st iteration process of the scene, For the configuration scheme of the kth iterative process, A velocity value calculated for the kth iteration process.

Description

Static reactive compensator constant volume and location method based on electromagnetic transient simulation Technical Field The invention relates to the field of power system planning, in particular to a static reactive power compensator constant volume and location method based on electromagnetic transient simulation. Background Along with a large number of HVDC transmission lines and new energy being connected into a power grid, the traditional alternating current power grid gradually evolves into an alternating current-direct current hybrid power grid which takes HVDC direct current power transmission as a backbone grid and is connected with a large number of new energy power generation and distributed electric equipment. A large number of power electronics are accompanied by nonlinear characteristics including complex dynamic response, high frequency and multi-time scale coupling. The novel power system structure requires more reactive support, which brings new challenges to reactive voltage stability of the power grid. The installation of reactive compensation equipment is an effective measure for supplementing reactive support and improving voltage stability, and a static reactive compensator has natural advantages in terms of size, price and response speed compared to other reactive compensation equipment such as synchronous regulators, static reactive generators, etc. On the other hand, the dynamic characteristic analysis of a large-scale power grid depends on time domain simulation, and the transient stability analysis of a large-scale power transmission and transformation system is an electromechanical transient simulation program which is adopted conventionally, however, with the development of a power system, a modern power grid integrates more and more complex elements, such as a renewable energy source device and a high-voltage direct current power transmission device, and the simulation precision of the electromechanical transient simulation program is not required when the electromechanical transient simulation program faces complex faults such as phase change failure, subsynchronous oscillation and the like. Therefore, electromagnetic transient simulation is required to be adopted for dynamic characteristic analysis of an actual power grid at present. Basic algorithms for electromagnetic transient simulation of power systems (electromagnetic transient program, hereinafter referred to as EMTP) were proposed by Dommel et al in the beginning of the 60 s of the 20 th century, and were originally used to study the problem of transient overvoltage of power systems. With the development of technology, more and more high-voltage direct-current transmission systems and power electronic components in a power grid are used, electromagnetic transient simulation is more and more important for better simulating the transient process of the power grid, and commercially used and mature electromagnetic transient simulation software such as EMTP-RV, PSCAD/EMTDC, cloudPSS and the like is generated. When the actual power transmission network encounters the problems of fault grounding of a transmission line and the like in operation, voltage fluctuation of the whole grid can possibly occur, the problems of direct-current power transmission commutation failure and the like are further caused, and safe and stable operation of the power transmission network is affected. For the problem of voltage instability of the grid that may occur in operation, it is necessary to add static reactive compensators at specific nodes to provide reactive support. For a large-scale power system with thousands of nodes, a plurality of positions for adding a static reactive compensator can be selected, however, not all sites can meet the problem of voltage instability of a power grid, and the configuration of each site and capacity also has differences on reactive voltage supporting capability of the power grid. At present, the problems of addressing and constant volume configuration of the newly added static var compensator still lack research, and an addressing optimization method of the static var compensator is needed. Disclosure of Invention In order to solve the technical problems in the prior art, the invention provides the static reactive compensator constant volume and location method based on electromagnetic transient simulation, which can comprehensively consider the economical efficiency and the stability of a power system, find the bus position most suitable for newly building the static reactive compensator and provide an optimized strategy scheme for reactive voltage support of the system. The invention can be achieved by adopting the following technical scheme: a static var compensator constant volume site selection method based on electromagnetic transient simulation, the method comprising: s1, randomly generating P simulation scenes and P speed vectors, wherein each simulation scene corresponds to a configuration s