区域电网集中式网络保护研究

Research on centralized network protection of regional power grid

从区域电网整体考虑给出了区域电网集中式网络保护主保护和后备保护的定义,提出了分层的差动保护方法。针对区域电网拓扑结构的特点提出了以双层链表结构进行电网拓扑结构的表达方法,并结合具体实例分析了拓扑结构的识别方法。还对电网集中式保护的故障处理流程进行了研究,提出了按照电流判启动后先电压选线调度再计算差动跳闸的原则。根据提出的区域电网集中式保护方案进行了实现,并用RTDS建立了包括4个220kV变电站在内的区域电网仿真系统。动模试验结果表明,使用区域电网集中式差动保护除传统主保护功能外,其后备差动保护比传统远后备保护具有选择性好,灵敏度高,动作速度快的特点。

From the consideration of the regional power grid as a whole, this paper defines the main protection and backup protection of the centralized network of regional power grid protection, and proposes the hierarchical differential protection method. Double-linked list structure is used to express the grid topology according to characteristics of the regional grid topology, and the identification of topology is analyzed with specific examples. This paper also studies fault handling process of the grid centralized protection and proposes the principle of scheduling voltage line selection firstly and then calculating differential tripping after the start of the current-contracting. A regional power grid simulation system including four 220 kV substations is established using RTDS Dynamic simulation test results show that except for possessing the traditional main protection functions, the reserve differential protection of centralized differential protection of the regional power grid has the features of good selectivity, high sensitivity, and fast action compared with traditional remote backup protection.