含分布式电源多点接入的配电网新型纵联保护

为解决因分布式电源接入配电网导致网络拓扑结构改变而引起的依靠传统电源故障特性建立的保护方案容易发生误动和拒动问题,提出一种基于保护安装处电流序分量相位差的新型纵联保护方案。方案定义电流负序分量和正序分量相位差为电流序分量相位差。通过计算保护装置处电流序分量相位差,进而再比较线路两端保护装置处的电流序分量相位差值大小,快速识别区内外故障。方案针对分布式电源多点接入、过渡电阻大小影响,不可测分支存在情况分别进行分析仿真。最后利用Matlab仿真软件对保护方案进行仿真,验证了保护方案的正确性。

New longitudinal Protection of Distributed Network With Distributed Generation Multi-point Access

In order to solve the problem that the protection scheme based on the fault characteristics of traditional power supply is easy to malfunction and refuse to operate due to the change of network topology caused by the access of distributed generation to distribution network, a new longitudinal protection scheme based on the phase angle difference of current sequence is proposed. The scheme defines the phase difference of current negative sequence component and the positive sequence component as the phase angle difference of current sequence. By calculating the phase angle difference of current sequence components at the protection device, then comparing the phase angle difference value at both ends of the line, the fault inside and outside the circuit can be quickly identified. The scheme analyzes and simulates the influence of multi-point access and transition resistance of DG, and the existence of unmeasurable branches. Finally, MATLAB simulation software is used to simulate the protection scheme to verify the correctness of the protection scheme.