光伏发电系统孤岛运行状态的故障特性分析  

Fault Characteristic Analysis of Photovoltaic Power System Islanding Operation

作　　者：李盛伟[1,2] 李永丽[1] 孙景钌[1] 金强[1] 李旭光[1] 邓哲[3] 

机构地区：[1]天津大学智能电网教育部重点实验室,天津300072 [2]天津市电力公司技术中心,天津300384 [3]南华大学电气工程学院,衡阳421001

出　　处：《天津大学学报》2011年第5期401-405,共5页Journal of Tianjin University(Science and Technology)

基　　金：国家重点基础研究计划(973计划)资助项目(2009CB219704);国家高技术研究发展计划(863计划)资助项目(2007AA05Z241);天津市自然科学基金资助项目(08JCYBJC13500)

摘　　要：为光伏发电(PV)系统及其相关元件合理地配置保护,研究了接入到380,V/50,Hz低压配电网的三相PV系统,并使用欧姆定律及对称分量法对其馈线或联络线的不同类型故障进行了理论分析.同时,在PSCAD/EMTDC中搭建了PV系统的实时仿真模型,并对理论分析结果进行了仿真验证.理论分析和仿真结果一致表明:在PV系统孤岛运行时,基于电流原理的保护将不能正确反映各种故障类型.通过总结故障分析结果,得出了相电压跌落和负序电压升高分别是对应于对称性及非对称性故障的较为明显的故障特征的结论,为保护配置方案的研究提供了理论基础.To guarantee the security and the stability of the photovoltaic（PV） system,the appropriate protection scheme is absolutely necessary.The three-phase PV system which is connected with the 380 V/50 Hz distribution power system is investigated,and the theoretical analysis of the various faults of the feeder or electric line is accomplished.The theoretical analysis results are confirmed by the PSCAD/EMTDC simulation,and the analysis and simulation results are consistent in showing that the current protection is not suitable for the PV system islanding operation any more.By generalizing the fault analysis results,it can be concluded that the sag of the phase voltage and the swell of the negative sequence voltage are the obvious fault characteristics of the balanced and unbalanced faults respectively.The theoretical basis is provided to study the related protection scheme.

关 键 词：光伏发电 故障分析 孤岛运行 并网运行 继电保护 

分 类 号：TM761[电气工程—电力系统及自动化]