计及母联开关的高压直流工程最后断路器智能判断方法

为了提高电网运行的安全可靠性，提出了一种计及母联开关的高压直流工程最后断路器智能判断方法。建立了涉及母联开关的交流场等效模型和图论求解模型，针对各交流母线上接入的N个母联开关，将交流母线抽象为N+1个节点，各节点之间经母联开关相连。以线路汇集节点为起点，以阀组为终点，通过搜索图论模型中起点到终点之间割边的集合，解决了多种功率输送方式下使用常规逻辑设计无法实现包含母联开关在内的整个交流场阀组最后断路器求解的问题。理论推导和工程用例结果表明，该方法能够大大降低工程应用程序的编写和调试难度，有效规避工程扩建期间由于功能修改带来的风险，确保电网安全可靠地运行。

Intelligent judgment method for the last breaker in HVDC project including bus-tie switch

In order to improve the safety and reliability of power grid operation, an intelligent judement method for the last circuit breaker in HVDC project including bus-tie switch is proposed. An equivalent model and graph theory model for the last circuit breaker of AC field including bus-tie switch is set up, in view of the N bus-tie switches which are inserted in each AC bus, the AC bus is abstracted as N+1 nodes, and the nodes are connected by bus-tie swich. Taking line convergence joint as starting point and converter as the finishing piont, by way of searching the set of cut edges between starting and finishing point in the graph theory model, the problem that using conventional logic design can not realize the judement of last breaker of the full AC filed including bus-tie switch under multiple power transmission mode is sovled. Theoretical analysis and engineering case results show that this method can make the engineering application programming and debugging much easier, effectively avoid the risk of functional changes during the project expansion, and ensure the safe and reliable operation of power grid.