摘要
链式多电平变换器的载波移相PWM方法(CPS-PWM)控制性能和输出性能良好,但在高压大容量场合,直流电压利用率低,器件开关频率高,开关损耗大。结合不连续脉宽调制(DPWM)策略自由度控制思想和CPS-PWM方法原理,提出大容量链式多电平变换器的优化CPS-PWM方法;阐述了优化CPS-PWM方法的原理,分析了功率因数角、开关频率、载波相位与开关损耗的关系,分别推导出同相方式和异相方式的频域输出电压公式。同相方式时直流电压利用率可提高1.154倍,异相方式时可消除输出共模电压分量,两种方式的开关频率均降低1/3倍,控制性能和波形质量保持不变。链式多电平逆变器和链式STATCOM的实验结果表明了优化CPS-PWM方法的正确性和可行性。
Carrier phase-shifted PWM （CPS-PWM） of cascaded multilevel converter has a good control and output performance, but has low utilization of DC voltage, higher switching frequency of the device and more switching loss. Combined the idea about controlling freedom degrees of DPWM and the CPS-PWM, an optimal CPS-PWM strategy more suitable for high-power cascaded multilevel converter is proposed in this paper. The principle of optimization CPS-PWM is given, and the relationship between power-factor angle, switching frequency, carrier-phase and switching loss is amalyzed, and the output voltage formulas in frequency domain both in-phase mode and inter-phase mode are deduced. DC voltage can be increased by 1.154 times when in-phase mode, and can eliminate the output common-mode voltage component when inter-phase mode, and both modes can reduce 1/3 switching frequency, and still maintains the waveform quality and the control performance. The experimental results on the cascaded multilevel inverter and cascaded STATCOM platform are given to demonstrate the correctness and feasibility of the optimization CPS-PWM method.
出处
《电工技术学报》
EI
CSCD
北大核心
2013年第10期167-178,共12页
Transactions of China Electrotechnical Society
基金
陕西省重点学科建设专项资金资助项目(105-00X901)
关键词
载波移相PWM
不连续脉宽调制
链式多电平变换器
电压利用率
开关损耗
Carrier phase-shifted PWM, discontinuous pulse width modulation, cascaded multilevel converter, voltage utilization, switching loss
作者简介
杨波男，1983年生，博士研究生，研究方向为新型电力电子变换器及其控制。
曾光男，1957年生，博士，教授，研究方向为电力电子技术及应用与计算机控制系统。
