级联型多电平变频器的一种改进PWM调制法

Research on improved modulation strategy of cells cascaded multi-level converter

本文简单介绍级联型多电平变频器的拓扑结构及其通常采用的载波移相控制的工作原理,根据它的优缺点,提出了一种新型的适用于级联型多电平变频器的改进PWM调制策略,阐述该策略的原理,并给出了其系统的实现方法。使用MATLAB软件对该法进行建模和仿真,结果表明新方法比载波移相法具有更好的控制效果。基于级联型高压变频器平台进行了实验,采用TMS320F2812 DSP,FPGA和PLC实现系统的数字控制,实验结果论证了该方法的可行性。

The topologies and work principle of carrier phase shift control of cells cascaded multi-level converter are introduced simply in this paper. According to its advantages and disadvantages, a new improved PWM modulation strategy is presented, which is suitable for cascade multi-level converters. Then, the paper presents its principle and gives the method of system realization. The building of system module and simulating of this method were done by MATLAB software. The simulation results show that this strategy has the better control effect compared phase shift control. Based on cells cascaded high-voltage converter, numeric control of the system was TMS320F2812, FPGA and PLC. The experimental results demonstrate the feasibility of this new method.