摘要
介绍了模块化多电平换流器(modularized multilevel converter,MMC)的拓扑结构及其工作原理,针对MMC子模块电容电压平衡问题,提出了一种新型的适用于采用载波移相正弦脉宽调制技术的MMC电容电压优化平衡控制算法,其本质是调整子模块的导通时间以对其电容电压进行动态调节。分别定义了在系统工作点附近具有相对稳定性的环流抑制系数以及电容均压系数,对子模块调制波进行纵向调整,有效确保MMC子模块电容电压的动态平衡;同时给出了环流抑制系数和电容均压系数的优化目标,以期得到理想的电容电压平衡控制效果。仿真结果验证了所提算法的正确性与有效性。
The topological structure and working principle of modularized multilevel converter （MMC） are presented, and a novel capacitance voltage balancing algorithm for MMC, in which the carrier phase shifted sinusoidal pulse width modulation （CPS-SPWM） technology is adopted, is proposed. The essence of the proposed algorithm is dynamical regulation of capacitance voltage by adjusting the turn-on time of sub-modules in each bridge-arm. The circulating current suppression index, which is near the working point of the system and possesses relative stability, as well as the capacitance voltage balancing index are defined respectively, and the longitudinal adjustment of modulation waves of the corresponding sub-modules is performed to effectively ensure the dynamic balance of capacitance voltage of MMC sub-modules; meanwhile the optimization objectives of circulating current suppressing index and capacitance Voltage balancing index are given to achieve desired effect of balance control of capacitance voltage. Both correctness and effectiveness of the proposed algorithm are verified by simulation results.
出处
《电网技术》
EI
CSCD
北大核心
2012年第6期256-261,共6页
Power System Technology
基金
国家自然科学基金项目(51177042)
中央高校基本科研业务费项目(11QX46)~~
关键词
模块化多电平换流器
高压直流输电
正弦脉宽调
制
环流抑制
子模块电容均压
modularized multilevel converter（MMC）： highvoltage direct current （HVDC） power transmission
sinusoidalpulse width modulation
circulating current suppression
sub-module capacitance voltage balancing
