Z源光伏并网直接电流单周控制系统  

A Direct Current One-cycle Control Method for Z-source Grid-connected Photovoltaic System

作　　者：蒋立[1] 郑建勇[1] 

机构地区：[1]东南大学电气工程学院苏州研究院,江苏省苏州市215123

出　　处：《电力系统自动化》2008年第22期87-90,共4页Automation of Electric Power Systems

基　　金：2007年江苏省科技成果转化专项资金资助项目(BA2007070)~~

摘　　要：为构建高效且结构简单的光伏并网系统,将单周控制这一非线性控制方法用于电流内环,快速跟踪电流的同时,开关频率得以保持不变,改善了传统并网逆变系统三环控制性能。阻抗源(Z源)变换器将光伏电池板电压提升以满足并网电压条件,并实现最大功率跟踪。给出了综合以上两者的系统结构和单周控制模型,通过对电流跟踪过程的理论分析,结合MATLAB/Simulink仿真结果表明并网电流能很好地跟踪指令电流与电网电压同步。该方案通过了小功率实验验证。To build an efficient grid-connected photovoltaic system with simple structure, one-cycle control, a non linear control method, is applied to the inner loop current control. The conventional three-loop control performance is improved by keeping the switching frequency constant while maintaining an optimal current-tracking effect. Z-source converter boosts the photovoltaic panel voltage to meet the grid-connecting requirement, also achieve the maximum power point tracking. A system topology and one-cycle control model is proposed. Theoretical analysis and simulation results using Matlab/Simulink reveal that the output current of the inverter synchronizes with the grid voltage effectively. Small power experiments verify the proposed method. This work is supported by the Special Program for the Commercialization of Key Science and Technology Achievements, Jiangsu, 2007 （No. BA2007070）.

关 键 词：Z源 单周控制 光伏并网 电流跟踪 

分 类 号：TM615[电气工程—电力系统及自动化] TM131