IIDG低压穿越模型及其在配网故障分析中的应用  

Low-voltage Ride Through Model of Inverter-interfaced Distributed Generator and Its Application to Fault Analysis of Distribution Network

作　　者：戴志辉[1] 李川[1] 焦彦军[1] DAI Zhihui;LI Chuan;JIAO Yanjun(School of Electrical and Electronic Engineering,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学电气与电子工程学院,保定071003

出　　处：《电力系统及其自动化学报》2018年第7期16-23,共8页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目(51307059);河北省自然科学基金资助项目(E2014502065);中央高校基本科研业务费专项资金资助项目(2017MS096)

摘　　要：在我国并网规程对分布式电源低压穿越功能的要求下,为了实现逆变型分布式电源IIDG(inverter-inter-faced distributed generator)的最优工作效率,提出了基于无功电流支撑的低电压控制策略。通过增加电压跌落门槛值实现输出有功电流的优化,并分析了采用该策略时逆变型分布式电源的故障特性。在此基础上,建立了含IIDG的配电网短路计算模型。DIGSILENT仿真表明该低电压穿越策略在电压跌落时可实现IIDG的并网运行和最大的有功输出。含IIDG的配电网短路计算模型考虑了低压穿越策略,为大规模分布式电源并网的继电保护方案提供参考。To realize the optimal efficiency of an inverter-interfaced distributed generator(IIDG)according to the lowvoltage ride through(LVRT)requirement stipulated by the distribution network standards in China,a reactive current supported low-current control strategy was proposed.By adding a voltage dip threshold,the optimization of active current output could be realized.Moreover,the fault characteristics of IIDGs were analyzed under this strategy.On this basis,a short-circuit calculation model of distribution network with IIDGs was established.Case studies in DIGSILENT showed that under this strategy,IIDGs could remain grid-connected while maximizing their active power output during voltage dips.With the consideration of LVRT strategy,the proposed short-circuit calculation model can provide a reference for the schemes of protective relays in the integration of large-scale distribution networks.

关 键 词：逆变型分布式电源 低电压穿越 故障分析 短路模型 配电网 

分 类 号：TM711[电气工程—电力系统及自动化]