摘要
提出一种用于级联型大功率变流器的多变量组合控制方案,综合利用非对称直流母线电压控制、移相控制和脉冲宽度调制(PWM)。与传统的非对称电平、阶梯波合成以及混合型调制控制方案相比,该控制方案能更好地消除输出电压的低次谐波,且全部功率器件均低频工作。本文分析了该控制方案下的输出电压谐波特性和各逆变模块功率分配。该控制方案简洁可靠,开关频率低,可用于现有典型的级联型结构变流器。基于混合非对称级联型拓扑并结合SPWM、SHEPWM调制策略的实验样机验证控制方案的可行性和低次谐波消除效果,仿真和实验结果表明理论分析的正确性。
A multi-variable combination control scheme is proposed for high power cascaded inverter. The asymmetric voltage bus control, phase shifting control and pulse wide modulation control are combined effectively. This control scheme processes preferable low-order harmonics elimination with low switching frequency for all switches, comparing with the traditional asymmetric level, staircase and hybrid modulation control scheme. The harmonics of output voltage and power distribution of each inverter module are analyzed. The multi-variable combination control scheme is characterized as concise and reliable control scheme, low switching frequency and strong commonality for several typical cascaded inverters. The feasibility of control scheme and effect of low-order elimination is verified by prototype with hybrid asymmetric cascaded topology and SPWM or SHEPWM strategy. Simulation and experimental results show validity of theoretical analysis.
出处
《电工技术学报》
EI
CSCD
北大核心
2015年第4期129-136,共8页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(51077070)
江苏省科技支撑计划(BE2010188)
江苏省普通高校研究生科研创新计划(CXZZ12_015
中央高校基本科研业务费专项资金)资助项目
关键词
级联型变流器
低开关频率
多变量组合控制
谐波抵消
Cascaded inverter,low switching frequency,multi-variable combination control,harmonics elimination
