供电系统低压配电网继电安全保护仿真

Simulation of Relay Safety Protection for Low Voltage Distribution Network of Power Supply System

对供电系统低压配电网继电的安全保护,能够保证供电系统供电的安全性、可靠性和持续性。对低压配电网继电保护,需要获取继电保护区域以内的综合阻抗和继电保护的保护判据,确定故障点位置,完成对低压配电网继电保护。传统方法建立继电关联保护的特征向量,通过信息矩阵的输出值进行继电保护区域的故障定位与判别,但忽略了确定配电网故障点位置,导致继电安全保护精度偏低。提出智能电压低压配电网继电保护模型,首先计算继电保护区域以外的综合阻抗和故障发生时的故障附加电路电流和电压,判断继电保护区域上是否发生了故障;然后计算继电保护区域以内的综合阻抗和继电保护的保护判据;最后依据判据结果,确定故障点位置,采用相应策略实现继电保护。仿真结果证明,所提方法能够提高故障识别概率,实现故障位置的准确定位,保证供电系统的持续稳定供电。

This article proposes a model for relay protection of low - voltage network of intelligent voltage. First- ly, the comprehensive impedance Outside area of relay protection and current and voltage of fault adjunct circuit dur- ing failure occurrence are calculated, and then whether fault occurred in the area of relay protection is judged. More- over, the comprehensive impedance inside area of relay protection and protection criterion of the relay protection are calculated. Finally, according to the criterion result, the position of fault is confirmed. Thus, the relay protection is achieved by using corresponding strategy. Simulation results prove that the method can improve probability of fault identification and achieve exact orientation of fault position. It ensures continuous and steady power supply of power supply system.