摘要
光伏并网发电系统是光伏发电系统发展的趋势。单极式光伏并网逆变系统具有拓扑结构简单,成本较低的有点。这种系统中只存在一个能量变换环节,太阳能最大功率点跟踪(MPPT),电网电压同步等控制目标需要考虑。本文介绍了单极式光伏系统的拓扑结构和实现最大功率的工作原理,阐述了电导增量法实现MPPT的基本思想。根据光伏系统并网发电拓扑结构,设计了一套新型的实现最大功率跟踪的单极式光伏并网逆变器,逆变器控制部分由DSP实现最大功率跟踪和输出电流跟踪控制,实现了逆变输出电流与电网同步,且高功率因数运行。仿真和实验结果表明,单极式光伏并网逆变系统能准确跟踪太阳能电池最大功率点,并具有较好的稳定性。
Grid-connected photovohaic（PV） system is the trend of photovoltaic system＇s development.Single-state grid-connected photovohaic system has advantage such as simple topology,low cost,ect.This system has only one stage of power conversion and all control objectives need to be considered, This paper introduces the topology and MPPT＇s principle of single-state PV system,as well as illuminates the basic principle of MPPT realized by conductance increment method.According to the topology of the PV system,a nevel single-state PV inverter is designed.The inverter is of MPPT and export current tracking and synchronization with the utility and operation at high power factor based on DSP .Simulink resuh illustrates single-state grid-connected PV system can realize MPPT accurately,also shows the high stability and high efficiedty.
出处
《微计算机信息》
北大核心
2007年第34期202-204,共3页
Control & Automation
基金
国家自然科学基金(50307005)
关键词
并网光伏系统
最大功率点跟踪
电导增量法
单极并网逆变器
grid-connected photovoltaic（PV） system,maximum power point tracking,conductance increment method,single-state PV inverter
