含微网群并网的配电网纵联保护方案

The Pilot Protection Programmes of Distribution Network Including Microgrid

摘要: 首先，本文分析了微网群并网对配电网保护的影响。微网群并网会引起保护的误动、拒动以及使保护失去选择性，给配电网的保护带来了许多不利的影响。其次，本文提出了一种基于故障分量电流向量比较的允许式纵联保护方案。通过比较方向元件采集的电流相位信息来确定故障线路，并由纵联线路两端保护发送允许信号断开故障线路。该方案充分发挥了允许式纵联比较保护的动作速度快及灵敏度高的优势；无需电压信息，减少了信息交互，提高保护动作的准确性与可靠性；方向元件的应用极大地降低了允许式对通讯通道的要求，提高了允许式纵联比较保护的可靠性。最后，本文搭建Simulink仿真实验模型，分析了在不同故障情况下该方案的可行性，能够有效解决微网群并网给配电网保护带来的问题。

Abstract: Firstly, this paper analyzes the effect of micro-microgrid-connected group on distribution network protection. Microgrid network will cause the malfunction of protection, refuse and protection to lose selectivity, and bring many adverse effects to the protection of distribution network. Secondly, this paper proposes a new scheme based on the comparison of the current vector of fault component. The fault line is determined by comparing the current phase information collected by the direction element, and the two ends of the longitudinal link are protected to allow the signal to be disconnected. The project makes full use of the allowed type longitudinal comparison protection action speed and high sensitivity advantage; without voltage information, reducing information exchange, improving the accuracy and reliability of the protection action; application of directional element is greatly reduced to allow type communication channels, improving the reliability of allowed type longitudinal comparison protection. At last, this paper builds the Simulink simulation model, and analyzes the feasibility of the scheme under different fault conditions, which can effectively solve the micro network connected to distribution network protection problems.