含分布式电源配电网的相间短路故障分析  

Analysis on the Distribution Network With Distributed Generators Under Phase-to-phase Short-circuit Faults

作　　者：吴争荣[1] 王钢[1] 李海锋[1] 潘国清[1] 高翔[1] 

机构地区：[1]华南理工大学电力学院,广东省广州市510000

出　　处：《中国电机工程学报》2013年第1期130-136,共7页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973项目)(2009CB219704);粤港关键领域重点突破项目(2009A091300011);广东省教育部产学研结合重点/重大项目(2011A090200127;2011A090200074);广东省自然科学基金(S2012010008355)~~

摘　　要：以电压源换流器为接口的分布式电源(distributedgenerator,DG)的故障电流完全由其控制策略决定,其传统的等值模型通常与常规电源类似,而忽视了控制策略的影响,造成含DG配电网故障分析存在局限性,尤其对于非对称故障情况。为此,首先对DG的相间短路故障穿越控制特性进行分析,针对正序分量控制的DG提出了压控电流源等值模型;在此基础上,通过建立DG输出电流与公共联接点(point of common coupling,PCC)正、负序电压之间的关系方程式,推导出不同的相间短路故障条件下PCC正序电压的求解方程组,从而建立含DG配电网相间短路故障分析精确模型。基于DIgSILENT建立含DG配电网模型,仿真结果验证了该故障分析方法的正确性。The fault current of the distributed generators（DG） with voltage source converter （VSC） is determined by its control scheme. However, the traditional equivalent model for DGs didn＇t distinguish the DGs from common source. Thus, the effect of control scheme was neglected and this caused significant limitations on fault analysis of distribution network with DGs, especially in the case of unsymmetrical fault analysis. For this reason, this paper analyzed the control scheme and fault characteristics under phase-to-phase short-circuit faults, then put forward a voltage control current source equivalent model for DGs under positive sequence control. Based on this, the equations between the positive, negative sequence voltages of the point of common coupling （PCC） and DGs＇ currents were built. The solving equations for the positive voltage of PCC were built under different phase-to-phase short-circuits. Thus, the precise method for fault analysis under phase-to-phase short-circuit faults was obtained. A 10 kV distribution network case was built in DIgSILENT and the proposed method was verified to be correct.

关 键 词：分布式电源 配电网 等值模型 故障穿越控制 相间短路故障分析 

分 类 号：TM71[电气工程—电力系统及自动化]