摘要
在建立级联型H桥脉冲宽度调制(pulse Width modulation,PWM)变换器的平均模型的基础上,对单极性和双极性调制算法谐波特性进行分析,提出基于左、右桥臂独立调制的级联型调制算法;分析了级联型直流侧电压不均衡的原理及调节方法,给出基于调制比重构的直流侧平衡控制算法。MATLAB/Simulink软件仿真验证了所提出调制策略以及控制策略的有效性。
On the basis of establishing average model for pulse width modulation （PWM） rectifier of cascading H-bridge, the paper analyzes harmonic characteristics of single polarity and bipolar modulation algorithms. It proposes cascading modula- tion algorithm based on independent modulation of left and right bridge arms and analyzes mechanism of voltage imbalance at cascading DC side and modulation method; it presents balance control algorithm at DC side based on reconstitution of modulation ratio. Simulation by MATLAB/Simulink verifies effectiveness of modulation strategy and control strategy.
出处
《广东电力》
2012年第6期62-68,共7页
Guangdong Electric Power
基金
江苏省产学研前瞻性项目(BY2011156)
关键词
级联H桥
单极性
双极性
直流电压平衡
调制比重构
cascading H-bridge
single polarity
bipolarity
DC voltage balance
modulation ration reconstitution
