光伏并网发电系统软件锁相技术的研究

光伏并网发电系统是利用太阳能的主要技术之一,并网逆变器是实现其与电网连接的核心部分。为使光伏并网逆变器逆变输出电流能够更好地跟踪电网电压基波,完成同步锁相功能,本文以1kW单相光伏并网逆变器为研究平台,阐述光伏并网逆变器的工作原理和系统结构,分析并网逆变器的并网控制技术,提出一种基于坐标变换的双park鉴相器的软件锁相技术,最后通过Matlab仿真验证该方法的可行性。

Study on SPLL of Grid-connected PV Generation System

Grid-connected PV system is one of the technologies to use the solar energy.Grid-connected inverter is a core part of linking the grid.In order to make the output current of grid-connected inverter track the grid voltage fundamental and complete the Genlock,this paper uses 1kW single-phase photovoltaic grid-connected inverter as research platform.The paper describes the working principle of the photovoltaic grid-connected inverter and the system architecture.It analyzes the control technology of grid-connected inverter and proposes a software phase-locked loop of a dual-park phase detector based on coordinate transformation.At last it verifies the feasibility of this method by Matlab simulation.