摘要
光伏并网逆变器输出中存在的直流分量、谐波、间谐波造成的危害日益严重。将直流分量、谐波、间谐波三者一起定义为全谐波,并基于对其的分析,提出一种光伏并网逆变器全谐波的统一补偿策略。该策略以载波周期为单位对光伏并网逆变器输出电压中的全谐波进行统一瞬时检测,并通过改进并结合重复控制,比例积分(PI)控制,跟踪控制实现对其的统一补偿,通过构造半波负载和非线性负载模拟电网侧影响进行实验,实验结果验证了该策略对直流分量、谐波的单独补偿以及对全谐波的统一补偿的良好效果。
As DC component,harmonic and inter-harmonic existing in the output of photovoltaic grid-connected inverter are doing increasing harm,this paper analyses them which are defined as all-harmonic by the authors and proposes a strategy for unified compensation of the all-harmonic of photovoltaic grid-connected inverters.This strategy detects the all-harmonic in the output voltage by every carrier cycle in a unified and instantaneous manner, and it improves and incorporates repetitive control, proportional integral（H） control and tracking control to achieve unified co- mpensation of all-harmonic.This strategy has good effects on compensating DC component and harmonic as well as good unified compensation effects on all-harmonic, which is verified through experimental results by constructing half- wave load and non-linear load to simulate the effects of the grid.
出处
《电力电子技术》
CSCD
北大核心
2016年第5期31-34,37,共5页
Power Electronics
关键词
并网逆变器
谐波
间谐波
grid-connected inverter
harmonic
inter-harmonic
