三相Boost并网逆变器的离散时间预测控制  

Discrete-time Predictive Control of Three-phase Boost Grid-connected Inverter

作　　者：李玉玲[1] 王克柔[1] 林辉品[1] 张仲超[1] 

机构地区：[1]浙江大学电气工程学院,浙江省杭州市310027

出　　处：《中国电机工程学报》2011年第15期22-26,共5页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50707030)~~

摘　　要：三相Boost并网逆变器工作在直流输入电压小于电网电压峰值的场合,具有输入电压调节范围宽的优良特性,适合用于燃料电池、光电池等可再生能源系统的单级并网发电。提出一种三相Boost并网逆变器网侧电流的离散时间预测控制。该方法在每一个采样周期内,利用逆变器输出电流的离散时间模型和逆变器产生的7种电流空间矢量,预测逆变器下一个采样周期的网侧电流,并以该电流与理想网侧电流的误差最小作为优选指标,确定下一个采样周期的开关信号。该方法不需要传统Boost逆变器控制中的任何调制策略,方法简单,实现容易。实验结果表明,采用离散时间预测控制的三相Boost逆变器并网系统具有优良的并网性能。Three-phase Boost grid-connected inverters,working in the situation where the input DC voltage is lower than the peak grid voltage and varies in a wide range,greatly suits the single-stage fuel-cell or photovoltaic power conversion.This paper presented a discrete-time predictive control method applied to a Boost grid-connected inverter.In this method,a discrete-time model of output current and 7 types of current vectors generated by the inverter were used to predict the value of the grid current in the next sampling period.According to a quality index that minimizes the errors of the predicted grid current and the ideal grid current,the next sampling time of the switches signal were determined.This method avoids using any modulation in traditional Boost inverter control schemes,so it is easy and simple to be implemented.Experimental results demonstrate that good control performances can be obtained with the proposed discrete-time predictive control scheme for the Boost grid-connected inverter.

关 键 词：三相Boost并网逆变器 离散时间 预测控制 调制策略 

分 类 号：TM464[电气工程—电器]