基于大规模子模块群的MMC建模与快速仿真算法  

A Large-Scale Submodule Group Based Algorithm for Modeling and High-Speed Simulation of Modular Multilevel Converter

作　　者：郭高朋 胡学浩[2] 温家良 刘先正 王志霞 吴广禄[2] 

机构地区：[1]国网智能电网研究院,北京市昌平区102200 [2]中国电力科学研究院,北京市海淀区100192

出　　处：《电网技术》2015年第5期1226-1232,共7页Power System Technology

基　　金：国家重点基础研究发展计划项目(973计划)(2012CB215200)~~

摘　　要：对高压大容量模块化多电平变流器(modular multilevel converter,MMC)和基于MMC的直流输电系统进行仿真时,子模块数目众多,导致了仿真速度缓慢。针对该问题,分析了MMC桥臂的电气行为,建立了在闭锁状态和解闭锁状态时桥臂的数学模型。对该数学模型进行简化后,建立了桥臂的等效电路和等效电气关系,使之能够模拟桥臂的闭锁状态和解闭锁状态。为验证桥臂的等效电路和等效电气关系的准确性,设计了一个柔性直流输电系统,并在仿真软件中搭建了基于详细MMC模型和简化MMC模型的直流输电系统,对MMC的启动、解闭锁、稳态过程和直流故障过程进行了仿真。仿真结果表明,2种仿真模型的电气行为基本保持一致,验证了简化MMC模型的准确性。During the simulation of high-voltage modular multilevel converter （MMC） with high capacity and that of MMC based HVDC power transmission system, due to the large-number of submodules the simulation speed is slow. In allusion to this, the electrical behavior of the converter-ann of MMC is analyzed and mathematical models under blocking state and de-blocking state are established. After simplifying the established models, equivalent circuit and equivalent electrical relation of the converter-ann are created to make the established models enable to simulate the blocking state and de-blocking state of the converter-arm. To validate the accuracy between the equivalent circuit of the converter-arm and the equivalent electrical relation, a flexible HVDC transmission system is designed and HVDC transmission systems based on the detailed MMC model and the simplified MMC model are constructed in the simulation system respectively to simulate such process of HVDC transmission system as startup, de-blocking, steady state and DC fault. Simulation results show that the behaviors of the detailed MMC model and the simplified MMC model are basically the same, thus, the simulation accuracy by the simplified MMC model can be ensured.

关 键 词：模块化多电平变流器 高压直流输电 简化模型 变流器桥臂 仿真 

分 类 号：TM721[电气工程—电力系统及自动化]