考虑配电网保护约束的IIDG准入容量及对策分析  

Calculation of Penetration Level for Inverter Interfaced Distributed Generator Considering Protection in Distribution Network Constraints and Related Countermeasures

作　　者：李亚辉[1] 康积涛[1] 叶兰兰[1] 

机构地区：[1]西南交通大学电气工程学院,四川成都610031

出　　处：《中国电力》2013年第3期47-52,共6页Electric Power

摘　　要：逆变型分布式电源(IIDG)在系统故障时的输出特性与旋转电机有显著差异。考虑逆变器有限的过流能力建立了恒功率并网控制策略下的IIDG输出模型,定性分析配电网不同位置故障时IIDG的接入对继电保护可能的影响并推导含IIDG的短路电流计算公式。进而在保护配置不做出调整的条件下求得多个特定接入点处的IIDG的最大准入容量,并与未考虑过流限制的计算结果进行对比分析。为满足含高渗透率IIDG的复杂配电网保护需要,提出了一种配电网区域划分基础上的新型故障定位算法并借助算例进行了验证。There are significant differences in output characteristics between inverter interfaced distributed generator(IIDG) and rotating machine when accidents occur in power system.An IIDG's output model was established based on PQ control strategy considering its limited overcurrent ability,and a qualitative analysis was made on IIDG's influence on relay protection and the short-circuit current calculation formulas containing IIDG was duduced.The maximum penetration level of different access point was obtained according to current protection's state and compared with the penetration level without considering overcurrent limit.To meet the demand of protection of complicated distribution network with high permeability IIDG,a new fault location algorithm was proposed based on zone division and verified by a case study.

关 键 词：逆变型分布式电源 恒功率控制 配电网 准入容量 区域划分 故障定位 

分 类 号：TM711[电气工程—电力系统及自动化]