以电导增量法实现MPPT的单级光伏并网逆变器

Single-stage Photovoltaic Grid-connected Inverter of MPPT with Conductance Increment Method

介绍了单级光伏系统的拓朴结构和工作原理,着重阐述了用电导增量法实现最大功率跟踪(MPPT)的基本原理。根据光伏阵列的特性,设计了一套能实现最大功率跟踪的新型光伏并网逆变器。该逆变器采用单级结构,控制部分采用基于DSP(TMS320LF2407)控制的最大功率跟踪和电流跟踪控制策略,实现了与网压同步的正弦电流输出及高功率因数运行。

The grid-connected photovohaic system is a trend of photovohaic system development.This paper introduces the topology and operation principle of single-stage photovoltaic system,illuminates mainly the principle of realizing Maximum Power Point Tracking （MPPT） with conductance increment method.According to the character of solar array,we designed a novel grid-connected photovoltaie inverter with the function of MPPT.The inverter consists of a single-stage construction.We adopt the MPPT and current tracking algorithm via a DSP controller.As a result,the sinusoidal wave output current is synchronized with grid voltage, and operation is at high power factor.