光伏并网系统的新型基准正弦电路设计  

Design on Novel Reference Sinusoid Circuit of Grid-connected Photovoltaic System

作　　者：陈晓[1] 孙以泽[2] 徐洋[2] 孟婥[2] 

机构地区：[1]安阳工学院机械工程学院,河南安阳455000 [2]东华大学机械工程学院,上海201620

出　　处：《电气传动》2012年第12期69-72,共4页Electric Drive

基　　金：国家金太阳示范工程项目([2009]718号用户侧并网发电项目第47项);中央高校基本科研业务费专项资金重点项目(11D10301)

摘　　要：基于光伏并网系统在并网过程中需具备的同步锁相和孤岛检测两项关键技术,深入分析并设计了一种集成软件锁相和孤岛检测技术的新型光伏并网系统用基准正弦电路。该电路主要由电网电压检测电路、正弦波生成电路构成,采用了过/欠压、过/欠频检测和相位偏移法相结合来实现电路的锁相和孤岛检测功能。给出了关键电路参数设计准则与试验结果,试验结果证明该电路不仅可以输出与电网电压同步的基准正弦波,将其用于光伏并网系统中又具有孤岛检测功能,简单实用,价格低廉。According to phase-locked and islanding detection, which are two key technical requirements of photovoltaic grid-connected system, a novel reference sinusoid circuit was deeply analyzed and proposed, which consists of grid voltage detection circuit and sinusoid wave generation circuit. The phase-locked and islanding detection functions are achieved in combination with over-voltage protection/under-voltage protection, over- frequency protection/under-frequency protection and phase-shift method. The parameter design principle of these circuits and their test results were given, which show that, its output sinusoidal voltage is synchronous with grid voltage. Moreover, it has islanding detection function when it is used in photovoltaic grid-connected system. It is simple and practical with low price.

关 键 词：光伏并网系统 基准正弦电路 锁相 孤岛检测 

分 类 号：TK514[动力工程及工程热物理—热能工程]