光伏并网逆变器的定频滞环电流控制新方法  

Constant-frequency hysteresis current control of PV grid-connected inverter

作　　者：邹晓[1] 易灵芝[1] 张明和[1] 何素芬[1] 谢高生[1] 

机构地区：[1]湘潭大学信息工程学院,湖南湘潭411105

出　　处：《电力自动化设备》2008年第4期58-62,共5页Electric Power Automation Equipment

基　　金：湖南省学位与研究生教育重点项目(06A09);湘潭大学第三批大学生创新基金研究项目~~

摘　　要：提出一种用于光伏发电系统与公用电网并网的逆变器定频滞环电流控制新方法,该方法首先基于电网线电压空间矢量将复平面分为6个扇区,在每个扇区内实现两相开关解耦分别控制相应的线电流;然后,在控制相的下一个线电流误差周期到来时,计算并调节下一周期的滞环宽度以达到定频滞环电流跟踪,改善输出电流波形,提高控制精度。该方法的主要特点是不需要额外的模拟电路便可以实现开关频率的稳定。利用Matlab进行建模,仿真结果证明了该方法对稳定滞环开关频率是有效的,同时也表明该方法应用于光伏并网逆变器是可行的。A constant-frequency hysteresis current control method for PV grid-connected inverter is proposed,in which the complex plane is divided into six sectors based on grid line voltage space vector and the two-phase switch decoupling is realized in every sector to respectively control corresponding line currents. When the next current error cycle of controlled phase comes,the hysteresis band of that cycle is calculated and regulated to track the constant-frequency hysteresis current and improve the output current waveform and control accuracy. The stable switching frequency is thus achieved without additional analog circuitry. Simulation model is built with Matlab and the simulative results verify its validity and feasibility.

关 键 词：光伏并网逆变器 电压空间矢量 定频滞环控制 

分 类 号：TM464[电气工程—电器]