一种基于HHT的光伏并网发电系统保护方法  

A protection method of grid-connected PV power system based on HHT

作　　者：程宏波[1] 陈臣[1] 王勋[1] 伦利[1] 闫俊丽[1] 

机构地区：[1]华东交通大学电子与电气工程学院,南昌330013

出　　处：《电测与仪表》2016年第12期7-12,共6页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(51267004);江西省科技厅项目(2144BBE50008);南昌市科技局项目(1023HZCG013)

摘　　要：当光伏发电系统所连电网发生短路故障时,光伏电源的故障电流会发生暂态突变,但由于逆变器控制电路的保护作用,短路电流的幅值较小,因而传统的保护方法对光伏并网发电系统不一定适用。为寻求适合光伏并网发电系统的保护方法,建立了基于PSCAD/EMTDC的光伏并网发电系统仿真模型,对其短路电流的特性进行了仿真分析,利用希尔伯特-黄变换(HHT)对故障电流的波形进行分解,提出一种基于HHT的光伏并网发电系统保护方法,并进行了算例分析。结果表明,在含有光伏发电的电网发生短路故障时,该保护方法具有一定的有效性和可行性。When the short circuit faults of grid-connected PV（ photovoltaic） power system supply occurred,the fault current of PV power happens transient,due to the protective effect of inverter control circuit,the amplitude of fault current is small,as a result that the traditional detection methods cann＇t satisfy the requirements of grid connected PV generation. In order to seek protection method for grid-connected PV power system,the simulation model was set up based on PSCAD / EMTDC,the characteristics of the short-circuit current are analyzed,and Hilbert-Huang transform（ HHT） was proposed to decompose the fault waveform of current,which found the instantaneous frequency of the fault current is changing when single-phase to ground fault occurs,with this the protection scheme of grid connected PV system based on HHT is proposed. The effectiveness and feasibility of this protection scheme are verified.

关 键 词：光伏并网发电系统 保护 故障分析 HHT 

分 类 号：TM711[电气工程—电力系统及自动化]