混合多电平逆变器调制技术研究  

Modulation technology of hybrid multi-level inverter

作　　者：杨兴武[1] 高淳[1] 姜建国[1] 

机构地区：[1]上海交通大学电力传输与功率变换控制教育部重点实验室,上海200240

出　　处：《电力自动化设备》2011年第10期47-51,共5页Electric Power Automation Equipment

基　　金：国家高技术研究发展计划(863项目)(2011AA05-0403)~~

摘　　要：基于传统混合调制策略,在混合多电平逆变器所有调制比范围内,对各单元之间不发生能量流动时的直流电源电压取值问题进行分析,并通过对传统混合调制策略下混合多电平逆变器各单元输出电压的基波分析提出一种新方法:即将2个最低压单元用载波相移调制,使其均工作在高频状态。该方法的突出优点是在各单元不发生能量流动且不出现过调制的情况下,可以提高混合多电平逆变器的直流电源电压比值。最后给出了实验验证:由DSP产生调制信号,通过并行通信传送至FPGA,混合控制算法由FPGA实现。实验结果验证了该方法可在各单元之间不发生能量流动时,混合多电平逆变器的最高直流电压比由1:1:2:4:8:…提高到1:1:3:5:10:…。Based on traditional hybrid modulation strategy,the selection of DC supply voltage is analyzed for all modulation ratios of hybrid multi-level inverter when no energy flows between cells. Based on the analysis of output voltage fundamental for each unit,a modulation method is proposed：the two lowest-voltage cells are modulated by carrier phase-shift strategy to make their working frequency high,which improves the DC supply voltage ratio of hybrid multi-level inverter when no energy flows between cells and no over-modulation occurs. The modulation signals generated by DSP are sent to FPGA in parallel and the hybrid control algorithm is implemented by FPGA. Experimental results show that,the maximum DC voltage ratios are raised from 1：1：2： 4：8：… to 1：1：3：5：10：… when no energy flows between cells.

关 键 词：逆变器 基波电压 调制 比较电平 拓扑 

分 类 号：TM46[电气工程—电器]