摘要
针对常用的模块化多电平变换器电容电压平衡控制策略存在电容电压波动较大的问题,在分析改变子模块电容值对其电容电压影响的机理基础上,提出了一种复合电容电压平衡控制策略。该策略将修改调制波的控制策略与改变子模块电容值的控制策略相结合,以控制电容电压的平衡;采用CPS-SPWM对模块化多电平变换器进行调制,将输入到PWM整流器的有功和无功电流通过精确反馈线性化解耦,实现对整流功率因数和整流后直流电压的灵活控制。Matlab仿真结果表明,该控制策略有效地减少了电容电压的波动,达到了预期的效果。
In view of problem that capacitor voltage balance control strategy of common modular multilevel converter has a large fluctuation of capacitance voltage, a composite capacitor voltage control strategy was proposed on the basis of analysis of mechanism of influence of changing capacitance value of sub-modules on its capacitor voltage. The strategy combines control strategy of modifying modulation wave with control strategy of changing capacitance value of sub-modules, so as to control balance of the capacitor voltage. It uses CPS-SPWM to modulate modular multilevel converter, adopts accurate feedback linearization to decouple input active and reactive current of PWM rectifier, so as to control rectifier power factor and DC voltage after rectification. The Matlab simulation results show that the control strategy effectively reduces fluctuations of capacitance voltage and reaches prospective effect.
出处
《工矿自动化》
北大核心
2014年第5期71-76,共6页
Journal Of Mine Automation
基金
山西省研究生优秀创新项目(20133112)
山西省高校科技研究开发项目(20081063)
太原科技大学校博科技研究启动基金(20122033)
太原科技大学研究生科技创新项目(20125014)
关键词
多电平变换器
PWM整流器
电容电压平衡控制
精确反馈
载波移相调制
multilevel converter
PWM rectifier
capacitor voltage balance control
accurate feedback
carrier phase shift modulation
