【作者】 周敏；

【导师】 刘艳；

【作者基本信息】 华北电力大学 ， 农业电气化与自动化， 2011， 硕士

【摘要】 网络重构阶段是电力系统黑启动过程中的一个重要阶段,其系统结构持续变化、控制操作频繁,受到众多不确定性因素的影响。而在以火电机组为主要构成的系统中,机组的启动时间将决定大停电后网架重构的速度。本文首次采用电厂集控运行仿真机对火电机组的启动过程进行了深入研究,针对典型的机组类型建立了机组累积启动时间和机组停机时间之间的关系。在此基础上,提出了一种新的网架重构并行恢复策略。该策略以每一恢复阶段的可用启动功率为约束,将待恢复的机组节点作为优先级别最高的负荷节点与其他负荷节点一起考虑,并采用Prim算法寻找尽可能多的并行恢复路径。针对IEEE30节点和IEEE57节点系统的验证结果表明:所获得的重构顺序能够最大限度地利用启动功率,争取多台机组、多条路径的同时恢复,有效压缩了网架重构时间,提高了后续恢复的效率,对于快速、有序地组织系统的重构操作具有重要意义。同时获得的机组恢复时间对大停电后的网架重构提供了具有重要指导意义的时间信息。本文在极端情况下又考虑了机组启动失效后的网架重构恢复,并以IEEE30节点系统为例,得出了各个机组启动失效后的转移路径,针对不同机组启动失效后的恢复方案进行评估,识别出哪台机组启动失效后对系统后续恢复的影响较大。算例分析结果表明了该恢复策略的有效性和实用性,为调度人员提供了更具可行的操作指导。更多还原

【Abstract】 The network reconfiguration is an important stage in the process of the power system black start, attracted by many uncertain factors because of its system structure changes constantly、control operation frequently. In power systems mainly consisting of thermal units, the time for unit’s start-up and restoration determines the duration of network reconfiguration following large-area blackout. In this paper, centralized-operation simulator of power plant is first employed to investigate the starting process of thermal units thereby establishing the relation between start-up time and the cumulative downtime corresponding to typical unit types. On this basis, a parallel recovery strategy is proposed for network reconfiguration. According to this strategy, the unit nodes are viewed as the load nodes with the highest priority and dealt with the other load nodes together. After available crank power in each stage is used as constraints, parallel restoration paths are optimized with Prim algorithm. The application to IEEE 30-bus system and IEEE 57-bus system verify that reconfiguration scheme achieved can make full use of the crank power thereby restoring multi units and paths simultaneously so that the duration is reduced effectively, which is significant for organizing restoration scenarios rapidly and orderly following a large-scale blackout. Also it receives the unit recovery time which provides the time information of important guiding significance for network reconfiguration after blackout. This paper also considered the grid units start reconstruction after the failed recovery, and the establishment of the related index on the transfer path of uncertainty assessment, identification of unit start failure subsequent recovery of the system. Finally, to verify the relevant examples, the results show that the recovery strategy is effective and practical, has a more realistic operational guidance for dispatchers.更多还原