直接功率控制在三相光伏并网系统中的研究  

Direct Power Control of Three-phase Photovoltaic Grid-connected System

作　　者：宋平岗[1] 王锴[1] 兰洁[2] 李澄[1] 

机构地区：[1]华东交通大学电气与电子工程学院,江西南昌330013 [2]华南师范大学数学科学学院,广东广州510631

出　　处：《华东交通大学学报》2013年第1期10-14,共5页Journal of East China Jiaotong University

摘　　要：逆变器的控制在光伏并网系统中起着核心的作用,在三相光伏并网系统的基础上对并网逆变器提出了一种直接功率控制的方案。直接功率控制(DPC)仅需要测量交流侧的电压与电流,通过坐标转换,计算出瞬时有功功率与无功功率,得到的结果分别与PI调节得到的参考有功功率以及给定无功功率进行比较,经过滞环比较器,开关表等环节来控制并网变流器。Matlab/Simulink仿真结果表明,并网逆变器直接功率控制方法简单,并网功率因数接近于1,电流谐波小,具有良好的动态和稳态性能。Inverter control plays a central role in the photovoltaic grid system.This paper poposes a direct power control scheme of grid-connected inverter on the basis of the three-phase photovoltaic grid system.This study measures the voltage and current of the AC side,calculates the instantaneous active and reactive power through coordinate conversion,then compares the results with respectively the reference active power obtained in PI regulator and given reactive power,and finally completes the grid inverter control by a lag ring comparator and switch table links.Matlab / Simulink simulation results show that the grid-connected inverter direct power control method is simple with good dynamic and steady performance,and network power factor is close to 1 with small current harmonics.

关 键 词：逆变器 三相光伏并网 直接功率控制 开关表 

分 类 号：TM464[电气工程—电器]