混合多电平逆变器功率均衡分布的研究  

A Study on the Power Balanced Distribution of Hybrid Multi-level Inverters

作　　者：王源汇 南余荣[1] 

机构地区：[1]浙江工业大学信息工程学院,浙江杭州310023

出　　处：《电气自动化》2015年第3期3-6,共4页Electrical Automation

基　　金：浙江省自然科学基金重点项目(LZ2E07003)

摘　　要：基于多电平逆变器混合调制策略,高压逆变单元在调制比范围内,通过采用常值比较电平的方式,输出主要基波电压,低压单元采用高频调制方式调节输出电压。但低调制比时,高低压单元输出功率分布不均衡,降低了系统效率。通过分析发现,混合多电平逆变器直流电压比固定时,改变比较电平的取值在调节输出功率的同时并不影响输出电压波形。因此在全调制比范围内,通过比较电平的变化,调节逆变单元的输出功率,使各单元功率分布趋于均衡。对典型的混合不对称逆变器进行了仿真验证,仿真结果表明了新调制方法和分析的正确。Based on the hybrid modulation strategy for multiple-level converters, the high-voltage inverter unit generates main fundamental wave voltage output within the modulation ratio range in the method of normal comparative level, while the low-voltage unit adjusts the output voltage in the HF modulation method. At a lower modulation ratio, however, there is no balance in output power distribution between high and low voltage units, thus reducing system efficiency. As found in the analysis process, the hybrid multiple-level converter with a fixed DC voltage ratio will not affect the output voltage waveform when changing the comparative level. Therefore, by changing the comparative level over the entire range of modulation ratio, we can adjust the output power of the converter unit in such a way that the power distribution between these units may be balanced. The results of simulation made on typical asymmetrical hybrid converters show that the correctness of the new modulation method and analysis.

关 键 词：混合不对称 多电平逆变器 比较电平 线性输出 功率均衡 

分 类 号：TM464[电气工程—电器]