单相三阶SPWM逆变器设计及输出补偿研究  

Research on Single Phase Third Order SPWM Inverter and Output Compensation

作　　者：马乐[1] 李旭春[1] 肖佰旺[1] 

机构地区：[1]清华大学,自动化系,北京100084

出　　处：《电力电子技术》2011年第11期75-77,共3页Power Electronics

摘　　要：单相全桥结构是一类中小功率场合广泛采用的逆变器拓扑。分析了基于单相全桥电路的二阶正弦脉宽调制(SPWM)波与三阶SPWM波的生成方式,并通过二重傅里叶展开法分析了采用三阶SPWM逆变器在减小输出电压谐波含量方面的优越性。为减小输出电压中的谐波含量,分析了死区时间对系统输出的影响,并提出了谐波补偿方案。实验结果验证了三阶SPWM逆变器的优越之处及输出补偿的有效性。Single phase full-bridge inverter is one of the most common used topologies in middle and low power ap- plications.This paper compares the modulation method of 2nd order SPWM waveform with 3rd order SPWM waveform, and analyses their harmonic frequency speetrum by using double Fourier expansion method.According to the compari- son, 3rd order SPWM waveform is better in harmonic reduction.To reduce output harmonic waveform,this paper analy- ses the effect of dead-time to the system, and proposes a harmonic compensation algorithm.Experimental results prove 3rd order SPWM waveform＇s advantage and the effectiveness of their compensators.

关 键 词：逆变器 正弦脉宽调制 输出补偿 

分 类 号：TM464[电气工程—电器]