基于SVG功率因数调节的光伏电站集中孤岛检测法  

Centralized Islanding Detection Method for Photovoltaic Power Station Based on Power Factor Regulation with SVG

作　　者：贾科 魏宏升 李晨曦 林瑶琦 刘搏晗 何国庆[3] JIA Ke WEI Hongsheng LI Chenaci LIN Yaoqi LIU Bohan HE Guoqing(State Key Laboratory o{ Alternate Electrical Power System with Renewable Energy Sources （North China Electric Power University）, Beijing 102206, China State Grid AC Engineering Construction Corporation, Beijing 100082, China State Key Laboratory of Renewable Energy Sources and Energy Storage Operation Control （China Electric Power Research Institute）, Beijing 100192, China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市102206 [2]国家电网公司交流建设分公司,北京市100082 [3]新能源与储能运行控制国家重点实验室(中国电力科学研究院),北京市100192

出　　处：《电力系统自动化》2017年第6期92-97,112,共7页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51407067);中央高校基本科研业务费专项资金资助项目(2016ZZD01);国家电网公司总部科技项目"大规模新能源集中防孤岛技术研究与应用"~~

摘　　要：传统的主/被动式孤岛保护法应用于光伏电站孤岛检测时存在孤岛检测死区。文中首先分析孤岛前后电压和频率的变化情况,以及传统主动孤岛检测法应用于光伏电站时的失效机理,提出基于静止无功发生器(SVG)的集中防孤岛保护策略。根据光伏电站集中无功补偿的结构特点,在光伏电站低有功功率输出可能与本地负载功率匹配时,控制SVG输出的无功功率使得功率因数小幅波动,导致光伏电站系统输出的无功功率与本地负载消耗的无功功率不能匹配,以此来集中检测光伏电站的孤岛。理论分析和仿真验证结果证明该方法可以无死区检测孤岛。The conventional passive and active islanding detection methods have large non-detection zones when employed to detect the islanding of the photovoltaic（PV）power station.The changing situation of voltage amplitude and frequency before and after islanding and failure mechanism of the typical conventional active islanding detection method is analyzed firstly.Then the centralized islanding detection method for PV power station is proposed.According to the structural characteristics of centralized reactive power compensation in the PV power station,when the low output active power of PV power station may match the consumed active power of local loads,regulating the power factor to fluctuate within a narrow range by controlling reactive power output by static var generator（SVG）,leading to the mismatching of reactive power between PV power station system and local loads,and islanding is detected accordingly.Theoretical analysis and simulation result has proven that the proposed method can accurately detect islanding of PV power station without none detection zone.

关 键 词：光伏电站 孤岛检测 静止无功发生器(SVG) 功率因数 

分 类 号：TM615[电气工程—电力系统及自动化]