Z源光伏并网系统电流控制方法研究  

Research on the Current Control Method in Photovoltaic Grid-connected System Based on Z-source Inverter

作　　者：石新聪[1] 

机构地区：[1]山西省电力公司调度通信中心,山西太原030001

出　　处：《山西电力》2012年第2期66-69,共4页Shanxi Electric Power

摘　　要：结合滞环控制的特点,提出一种适用于Z源光伏并网系统的变滞环宽度的电流控制方法。该方法保留了传统滞环控制动态响应速度快,跟踪精确度高,稳定性高等优点,克服了传统滞环控制在过零点附近时滞环宽度过大,造成并网电流的谐波增大等不足。通过MATLAB仿真验证,结果表明该方法能有效改善电流波形,减小谐波含量,提高并网运行效率。A hysteresis band-varying current control method used in PV grid-connected system based on Z-source converter is presented in this paper.This algorithm comprehended the benefits of direct current control,such as quick dynamic response,high tracking precision,high stability,ect.;and overcame the disadvantages such as the increasing of THD caused by too large hysteresis-band at zero-crossing point.The simulation results show that it could effectively improve the quality of current waveform,reduce the harmonic content and improve the efficiency of the grid-connected inverter.

关 键 词：光伏系统 Z源逆变器 滞环电流控制 变滞环宽度 直通状态 

分 类 号：TM464[电气工程—电器]