两相坐标系下MMC环流抑制策略  

Circulating Current Suppression Control Strategy of MMC Under Static Coordinate

作　　者：宋平岗[1] 江浪[1] 李云丰[1] 

机构地区：[1]华东交通大学电气与电子工程学院,南昌330013

出　　处：《电测与仪表》2014年第20期80-84,共5页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(51367008)

摘　　要：MMC的相间环流具有二倍频负序性质,不会对外电路造成影响,但会增加电容电压、桥臂电流的波动程度以及系统损耗和电磁干扰,降低了MMC运行效率和使用寿命。在αβ坐标系下,将载波移相调制策略和排序算法相结合,采用比例谐振积分控制器,提出了一种无需旋转坐标变换的环流抑制策略。最后在MATLAB/Simulink中搭建了MMC-HVDC仿真模型,仿真结果表明所提策略的正确性和有效性。The double frequency negative circulating current among MMC three phases increase the voltage fluctuation of capacitor,arm current distortion,system losses and electro- magnetic interference,although they do not influence the outer circuit. Combining carrier phase shifted modulation strategy with sorting algorithm,a circulating current sup-pression control strategy is proposed without rotating coordinate transformation by adopting proportion resonance inte-gral controller under αβ coordinate. Finally,a MMC-HVDC simulation system is constructed in MATLAB/Simulink and the simulation results show that the proposed strategy is correctness and validity.

关 键 词：模块化多电平换流器 高压直流输电 环流抑制 均衡控制 

分 类 号：TM464[电气工程—电器]