基于三相串联半H桥型MMC的HVDC换流站研究  

HVDC Station Based on Three-phase Series-connected Half H-bridge Modular Multilevel Converter

作　　者：王春义 郝全睿[2] 孔鹏 曹相阳 高峰[2] 

机构地区：[1]国网山东省电力公司,济南250001 [2]电网智能化调度与控制教育部重点实验室(山东大学电气工程学院),济南250061

出　　处：《山东电力技术》2015年第9期1-8,13,共9页Shandong Electric Power

基　　金：山东省自然科学基金资助(ZR2014EEQ033);中国博士后基金资助(2015M572029);山东大学基本科研业务费专项资金资助(2014TB012)

摘　　要：提出一种基于三相串联半H桥型MMC的HVDC换流站模型,在承受相同直流电压的情况下,其开关器件数目只有传统MMC的1/3,经济性显著。首先分析半H桥型MMC的运行原理,提出其等效模型及直流侧电容的确定准则;然后建立三相串联半H桥型MMC换流站基于交流有功功率平衡的控制系统,解决了其在交流故障下安全稳定运行的问题,同时提出附加直流侧电压控制方法,改善了直流侧相间电压平衡;最后在PSCAD/EMTDC中搭建仿真模型,仿真结果验证了所提三相串联半H桥型MMC换流站良好的交流故障穿越能力。We propose a novel HVDC station based on three-phase series-connected half H-bridge modular multilevel converter （MMC） ,which could reduce two thirds of switching devices compared to the conventional MMC to withstand the same DC voltage.Firstly,the operational principles are analyzed,and the equivalent model and the principle to determine the DC capacitance of half H-bridge MMC are also proposed.Next, the control scheme based on AC power balance is established, which enables the station operates safely and stably under unbalanced grid condition.Besides,the additional DC voltage balance control is presented to improve the issue of DC voltage balance.Finally,the simulation results in PSCAD/EMTDC verify the AC fault ride-through ability of the proposed HVDC station.

关 键 词：高压直流输电 模块化多电平换流器 广义同步坐标系 不对称交流电压 电流矢量控制 

分 类 号：TM721.1[电气工程—电力系统及自动化]