含DG的多电源配电系统的故障分析

分布式发电系统广泛应用于配电网后传统的单电源供电模式变为多端电源供电模式,从而导致系统潮流分布和拓扑结构发生改变,使各线路发生故障时的短路电流大小和流向发生根本性变化,同时会对配电网继电保护装置的配置和动作整定值增加难度.针对上述问题,研究了由大系统、风电场、地方热电厂三方供电组成的多电源复杂配电系统,通过建立35 kV配电系统模型的等效电路,重点分析了风电场接入后,风电场接入线路上以及相邻线路上发生三相短路故障时,对系统各母线电压和各线路电流的影响,以及故障点位置对系统故障分量的影响,从而为多端供电网络的保护策略的研究提供了依据.研究结果表明,分布式电源接入配电网后,线路故障分量与分布式电源的输出功率以及分布式电源接入位置直接相关.

Failure analysis of more power distribution system with distributed generation

Distributed generation system is widely used in the distribution system, the traditional single power supply mode changes to a multi power supply mode, the construction of the system and the system power flow will be changed, and thereby changing the size and direction of each line short-circuit current, it is harder to prepare the grid protection devices and set the value of the protection. Aiming at these problems, the complex distribution system which contains wind farms and thermoelectric power factory was studied, it was analyzed that the change of voltage and current of each bus when the fault happen after the wind farms connected into the system, and it was discussed how the fauh location affect the system fault component. Then, the basis for the study of muhiterminal supply network protection strategy was proved. The research results show that the line fault component directly relates to the out power of distributed power and distributed power＇s access position, when distributed access to the distribution network.