摘要
模块组合多电平变换器(MMC)具有良好的可扩展性、模块化以及输出谐波含量低的特点,是一种能很好满足未来高压或中压功率变换需求的拓扑。首先建立了三相MMC系统基于开关函数的数学模型,然后在分析MMC特点的基础上,提出了双调制波载波移相SPWM(CPS-SPWM)技术在MMC中的具体实现方法。通过基于Matlab/Simulink的仿真模型,详细分析了其静态特性和动态特性,结果表明MMC采用CPS-SPWM技术后可获得较高的等效开关频率,同时具有较好的自动均压效果。实验结果进一步验证了控制策略的可行性和有效性。
Modular multilevel converter （MMC）, featured with scalability,modularity and low generation of harmonics, fulfils the demanding requirements for future high-voltage or medium-voltage power conversion. Firstly,a switching function based three-phase mathematical model of MMC was established. Then, based on the study of the characteristics of MMC,the law and realization of double-modulation-wave carrier phase shifted sinusoidal PWM （CPS - SPWM） applying for MMC was proposed and analyzed. The static and dynamic characteristics were explained in detail with the three-phase MMC simulation model based on Matlab / Simulink. The simulation results show that MMC with CPS - SPWM can achieve high equivalent switching frequency as well as good voltage self-balancing capability. The effectiveness of the proposed control strategies are further verified by the experimental results.
出处
《电气传动》
北大核心
2011年第10期15-20,共6页
Electric Drive
基金
北京交通大学优秀博士生科技创新基金项目(141091522)
关键词
模块化
多电平变换器
双调制波
载波移相SPWM
均压控制
桥臂电流
功率单元
modularity
multilevel converter
double-modulation-wave
carrier phase-shi（ted SPWM
voltagebalancing control
leg currents
power unit
