摘要
光伏并网逆变器作为光伏发电系统的核心部分,其直流侧工作电压必须高于电网峰值电压,故光伏发电系统一般采用Boost+逆变器两级式拓扑结构.以两级式三相光伏并网逆变器为研究对象,分析了其工作原理.前级Boost变换器控制实现MPPT控制;后级DC-AC变换器控制采用电压外环、电流内环双闭环控制,实现直流侧电压稳定和单位功率因数并网.最后在Matlab中搭建了两级式三相光伏并网逆变器的仿真模型,仿真结果表明了控制方法的有效性.
Photovoltaic（PV）grid-connected inveter is the core of photovoltaic power generation system. When it is working,its DC voltage must be higher than peak value of grid voltage,so photovoltaic power generation system usually uses the Boost＋inverter two-stage type topology structure. This paper takes double-stage three-phase photovoltaic grid-connected inverter as the research object,analyzes the work theory of double-stage three-phase photovoltaic grid-connected inverter. The pre-stage Boost converter control realizes maximum power point tracking（MPPT） control. The post-stage DC-AC inverter control uses double closed loop control of voltage outer loop and current inner loop,the control realizes stability of the DC voltage and grid-connected running with unity power factor. Finally,the simulation model of double-stage three-phase photovoltaic grid-connected inverter is built in the Matlab,the simulation results present the effectiveness of this control.
出处
《河南科学》
2017年第5期722-726,共5页
Henan Science
基金
商洛市科技局项目(SK2016-18)
关键词
光伏发电系统
两级式三相光伏电路
MPPT控制
双闭环控制
photovoltaic power system
double-stage three-phase photovoltaic circuit
maximum power point tracking（MPPT） control
double closed loop control
