具备直流故障电流阻断能力的MMC改进型拓扑的快速仿真算法  

Fast Simulation Method for Improved Topologies of Modular Multilevel Converter with DC Fault Current Blocking Capability

作　　者：尹晓东[1,2] 郝全睿[1,2] 李正[1,2] 王淑颖[3] 

机构地区：[1]电网智能化调度与控制教育部重点实验室,济南250061 [2]山东大学电气工程学院,济南250061 [3]国网山东省电力公司济南供电公司,济南250000

出　　处：《高电压技术》2017年第7期2183-2193,共11页High Voltage Engineering

基　　金：国家自然科学基金(51507093);山东省自然科学基金(ZR2014EEQ033);中国博士后基金(2015M572029)~~

摘　　要：模块化多电平换流器(MMC)主要采用半桥子模块(HBSM),但HBSM不能阻断直流故障电流,为此,国内外提出了多种具有直流故障电流阻断能力的MMC改进型拓扑。为了提高各MMC改进型拓扑的仿真效率,基于各改进型拓扑基本工作原理,研究了几种典型改进型拓扑的戴维南等效模型,该模型考虑了模块闭锁后桥臂残余电流的影响,提出了改进型拓扑闭锁后的模块电容电压修正方法,并与基于真实开关器件的详细模型进行了仿真对比。仿真表明,提出的改进型拓扑的戴维南等效模型与详细模型的仿真结果一致,能正确仿真MMC闭锁后的故障响应,而仿真时间大大缩短,该仿真模型有良好的研究和应用前景。Modular multilevel converter （MMC） mainly uses half-bridge sub-module （HBSM） as the basic SM. However, as HBSM fails to block the dc fault current, many enhanced SM topologies with dc fault current blocking capability are proposed for MMC application. To improve the simulation efficiency of enhanced SM topologies, we investigated the Thevenin equivalent models of several typical enhanced SM topologies based on their corresponding operation principles. Thereby, we proposed a method for modifying the voltage of SM capacitor considering the effect of the residual arm cur- rent after the blocking of MMC, and compared the proposed models with the detailed models based on real switches. The simulation results show that the proposed Thevenin equivalent model and the detailed model predict the identical perfor- mance of MMC with much less simulation time. These models have very good research and application prospects.

关 键 词：模块化多电平换流器 柔性直流输电 直流故障 闭锁 戴维南等效 改进型拓扑 

分 类 号：TM46[电气工程—电器]