摘要
针对光伏并网微型逆变器中光伏电池的输出功率所含有两倍的工频功率脉动问题,提出了一种新型功率解耦电路,可以有效地减小解耦电容的容量,使整个微型逆变器的寿命得到延长。详细分析了交错反激式微型逆变器的拓扑结构组成、工作过程及微型逆变器功率解耦的基本原理,并对目前较常用的三类功率解耦电路的工作方式及优缺点做了对比;对提出的功率解耦电路的两个工作模式及控制策略进行了详细分析,最后,在MATLAB仿真软件中搭建了带有功率解耦电路的交错反激式微型逆变器仿真模型,通过仿真实验可得功率解耦电路可以有效抑制功率脉动问题,控制策略可以实现单位功率因数并网。
In view of the output power of the photovoltaic cells of micro inverter contains the double frequency power pulsation, a novel power decoupling circuit is proposed, which can reduce the capacity of decoupling capacitors effectively and prolong the life of micro inverter. In this paper, the topological structure and working principle of the micro inverter and the principle of power decoupling is analyzed in detail. The work methods, merits and drawbacks of three kinds of power decoupling circuits are compared.Two operating modes and control strategies of the power decoupling circuit is proposed. Finally, a simulation model of the 230W with power decoupling circuit is built in the MATLAB simulation software. By means of the simulation experiment, the power decoupling circuit can restrain the power pulsation problem and the control strategy can achieve unity power factor.
出处
《电子技术应用》
北大核心
2017年第4期161-164,共4页
Application of Electronic Technique
基金
内蒙古自然科学基金项目(NJZY13122)
内蒙古高等学校科研项目(2013MS0707)
关键词
光伏并网
反激式
微型逆变器
功率解耦
grid-connected PV
flyback invert
micro inverter
power decoupling
