基于三相Z源并网逆变器的间接单周控制策略  

Study of Indirect One-cycle Control Strategy Based on Three-phase Z-source Grid-connected Inverter

作　　者：邓强[1] 杨燕翔[1] 田果[1] 易忠尧 赵帆[1] 

机构地区：[1]西华大学电气信息学院,四川成都610039

出　　处：《现代电力》2015年第4期74-78,共5页Modern Electric Power

基　　金：西华大学研究生创新基金(yljj2014082)

摘　　要：提出一种基于三相Z源网络的间接单周控制方式,解决常规控制方式所带来的系统复杂与响应速度慢的缺点。结合Z源阻抗网络中输入输出关系,建立三相Z源并网逆变器状态平均方程数学模型,运用单周控制原理推导控制方程,以实现单位功率因数并网。仿真结果表明,基于单周控制的三相Z源并网逆变器能在单个工频周期内(0.02s)实现单位功率因数并网,其输出电流谐波畸变率小于1%,且输出几乎不受输入电压波动的影响。与传统Z源并网逆变器比较,基于单周控制的间接电流控制方式能在没有电流采样环节的情况下快速实现单位功率因数并网,具有动态响应快、稳定性较强、鲁棒性较优的特点。In this paper, an indirect onecycle control strate gy based on threephase Zsource network is proposed to solve the disadvantages of complex system and slow response in the conventional control mode. Combined with the rela tionship between input and output of Zsource impedance network, the mathematical model of threephase Zsource gridconnected inverter is built based on stateaverage equa tions, and the control equation is deduced according to one cycle control principle, which make inverter connect to power grid with unit power factor. Simulation results show that the threephase Zsource gridconnected inverter based on onecycle control can realize grid connecting with unit power factor in single power cycle （0.02s）, the harmonic distortion rate of output current is less than 1%, and the output almost is not affected by input voltage fluctuation. Comparing with traditional Zsource gridconnected invert er, the indirect current control mode based on onecycle control can achieve grid connecting with unit power factorrapidly in the absence of current sampling, which has such advantages as fast dynamic response, strong stability, and good robustness.

关 键 词：三相Z源并网 单周控制 状态平均方程 单位功率因数 

分 类 号：TM4[电气工程—电器]