交直流混联电网系统保护策略校核与辅助决策方法

随着交直流混联电网的快速发展,系统保护策略成为保障跨区互联电网安全稳定运行的重要措施。由于系统运行环境多变,需根据电网实时运行状态与预想故障,对系统保护策略进行校核。通过研究多类型数据提取与关联匹配方法实现安控可调资源的在线跟踪与集成;提出逻辑校核与指标校核方法,对系统保护策略的有效性与合理性进行评估;基于校核结果,提出多直流紧急控制、抽蓄切泵、切负荷等多控制资源的协调策略,为电网调度提供参考。最后基于IEEE 39节点标准算例构造的两区四直流互联电网与山东电网模型,验证在直流闭锁故障下,系统保护策略校核与辅助决策方法的有效性。

Assessment of system protection strategy and aided decision scheme for AC/DC hybrid power systems

With the rapid development of AC/DC hybrid power system, the system protection strategy has become an important measure to ensure the safe and stable operation of trans-region power grids. Due to the changeable operation environment of the system, the effectiveness of the system protection strategy should be evaluated according to the real-time operation status of the power grid and the contingencies. The online tracking and integration of the adjustable resources of security control are realized by studying multi-type data extraction and association matching methods. The logical assessment and index assessment methods are proposed to assess the feasibility and rationality of the system protection strategy. Based on the assessment results, the coordination schemes of load shedding, multi-DC emergency control, switching the pump and other control resources are proposed, which can provide aided decision schemes for power grid dispatching. Finally, a two-area four-DC power grid constructed based on the IEEE 39-bus standard system and Shandong Power Grid model are taken as examples to verify the effectiveness of the assessment of system protection strategy and aided decision method under DC blocking fault.