采用空间矢量调制方法的光伏并网系统滞环电流控制

Hysteresis current control technique for grid-connected PV systems using space vector modulation method

文章研究了基于空间矢量调制概念的光伏并网系统滞环电流控制技术。该技术使用双滞环控制器获取电流误差信息,内滞环使输出电流在限定范围内,外滞环确定输出指令电压信号的空间位置。根据电流误差信号优化并网逆变器输出电压矢量,使误差电流信号变化速度降低,从而使逆变器的开关频率降低。该技术结合了空间矢量控制及滞环电流控制方法的优点,提高了逆变装置直流端的电压利用率,系统响应速度快,并且减少装置的散热及能量损失。

A space vector modulation （SVM） based hysteresis current control technique for grid- connected photovohaic （PV） system is studied in this paper. This technique adopts dual-hysteresis- loop to get error current signal. The inner loop confines output current, and the outer loop decides output reference voltage vector. This technique optimizes grid-connected PV inverter＇s output volt- age according to current error signals, so as to lower down current error changing rate, which re- duces switching frequency. This technique combines advantages of both SVM method and hystere- sis control method, improves system response speed, and lower down equipment heat and energy loss, which shows a high quality performance.