基于SVPWM调制的混合级联七电平逆变器优化控制策略  

A Space Vector Pulse Width Modulation Based Optimization Control Strategy for Hybrid Cascaded 7-Level Inverter

作　　者：耿俊利 梁晖[1] 金渊[1] 

机构地区：[1]国家能源主动配电网技术研发中心(北京交通大学),北京市海淀区100044

出　　处：《电网技术》2015年第2期327-333,共7页Power System Technology

基　　金：中央高校基本科研业务费专项资金资助项目(2009JBZ018-5);国家国际科技合作专项项目(2013DFA60930)~~

摘　　要：分析混合级联七电平逆变器带死区时的工作模式,不同工作模式下其逆变器电压的跳变情况不同。在此基础上,提出了基于空间矢量脉冲调制(space vector pulse width modulation,SVPWM)策略的优化控制方法。以控制支撑电容电压为前提,通过对每个区间支撑电容充放电切换过程所对应的开关动作次数、输出电压电平跳变情况的分析,提出了一种减小输出电压跳变的优化控制策略;此外,分析了死区时间的存在所带来的输出电压损失,根据伏秒平衡原理进行计算,并对其调制波进行死区补偿。仿真及实验结果验证了该控制策略的有效性。The working modes of hybrid cascaded 7-level inverter with dead zone are analyzed and analysis results show that there are different jumping situations of inverter voltage under different working modes. On this basis, based on space vector pulse width modulation （SVPWM） strategy an optimal control method is proposed. In the premise that the supporting capacitor voltage is under the control, through. analyzing the jumping of output voltage level and the valve action times correspondirig to the charging/discharging process of supporting capacity voltage switching in each interval an optimal control strategy to reduce the jumping of output voltage is put forward; besides, the output voltage loss due to the existence of dead zone time is analyzed and calculated according to the principle of volt-second balance, and the dead zone compensation for its modulation wave is performed. The effectiveness of the proposed control strategy is validated by results of simulation and experiments.

关 键 词：混合级联 SVPWM 优化控制策略 死区补偿 

分 类 号：TM721[电气工程—电力系统及自动化]