基于集散式逆变的光伏并网系统的仿真与研究

本文对光伏并网发电系统做了详细的介绍,其中包括对光伏电池的SIMULINK仿真以及对其输出特性的分析.然后提出一种以1 MW光伏并网发电系统为基础,应用集散式逆变系统来取代传统的集中式逆变系统和组串式逆变系统的方案.在靠近光伏组件端直接采用多路MPPT先进行最大功率点跟踪,并且将直流电升压到800 V之后,再集中在逆变室中进行逆变成520 V交流电,然后并入电网系统中,减少了交直流传输过程中的线损和逆变器自身损耗,并且提升了整个系统的发电效率.

Simulation and study of photovoltaic power system based on collecting and distributing type inverter

In this paper,the photovoltaic grid power generation system is introduced in detail firstly,including the MATLAB-SIMULINK simulation of photovoltaic cells,and the analysis of its output characteristics.And then a scheme which is based on 1 MW photovoltaic grid power generation system,applies the collecting and distributing type inverter system to replace the traditional centralized inverter system and the set of string type inverter system is put forward.Multi-channel MPPTs are adopting directly to track the maximum power point near the photovoltaic modules.And after direct current is boosted to 800 V,then is invertered centrakized into 520 V AC in the inverter rooms,and it is connected to the state grid finally.This system reduces the line loss during the DC/AC transmission and the inverters'loss,and improves the efficiency of the whole system.