基于三相Z源并网逆变器的间接单周控制策略
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。
Abstract:In this paper, an indirect one-cycle control strategy based on three-phase Z-source network is proposed to solve the disadvantages of complex system and slow response in the conventional control mode. Combined with the relationship between input and output of Z-source impedance network, the mathematical model of three-phase Z-source grid-connected inverter is built based on state-average equations, 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 three-phase Z-source grid-connected inverter based on one-cycle 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 Z-source grid-connected inverter, the indirect current control mode based on one-cycle control can achieve grid connecting with unit power factor rapidly in the absence of current sampling, which has such advantages as fast dynamic response, strong stability, and good robustness.
标题：基于三相Z源并网逆变器的间接单周控制策略
英文标题：Study of Indirect One-cycle Control Strategy Based on Three-phase Z-source Grid-connected Inverter
作者：邓强, 杨燕翔, 田果, 易忠尧, 赵帆,
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,
发表日期：2015-08-09
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