Z源光伏逆变器中感性负载的改进控制方法  

Improved control of Z-source PV inverter with inductive load

作　　者：高志强[1] 纪延超[1] 王建赜[1] 谭光慧[1] 

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,黑龙江哈尔滨150001

出　　处：《电力自动化设备》2011年第7期27-30,共4页Electric Power Automation Equipment

基　　金：黑龙江省青年科学技术专项资金项目(G010303)~~

摘　　要：简单Z源逆变器的控制方法通过在普通SPWM零状态中插入固定直通占空比来获得。该方法虽然实现简单,但是在感性负载情况下,由于换向过程中无法提供续流通道,给输出电压和电流造成严重的畸变。基于产生畸变的机理,提出了一种改进的SPWM控制方法。该方法在换向时提供续流通道,不仅消除由于感性负载引起的输出交流波形的畸变,而且减少了周期内开关管动作个数和次数,有效降低了输出交流的THD和能量的损耗,提高了逆变的效率和质量。通过Matlab/Simulink对改进控制方法进行了仿真,仿真结果证明该方法理论分析的正确性与可行性。Z-source inverter is normally controlled by simply inserting the fixed shoot-through state into the zero state of SPWM.Because there is no any free-wheel path,serious distortion of output voltage and current may be induced by inductive load.An improved SPWM control is proposed to support the free-wheel path,which not only eliminates the output voltage and current distortion of Z-source inverter with inductive load,but also lowers the switching frequency and decreases the operating switches in one cycle.Simulation with Matlab / Simulink verifies its effectiveness and feasibility.

关 键 词：Z源 逆变器 光伏 脉冲宽度调制 感性负载 电压畸变 

分 类 号：TM464[电气工程—电器]