N-2组合故障集的暂态功角稳定在线快速评估  

Online fast transient angle stability assessment of N-2 contingency set

作　　者：徐泰山[1] 鲍颜红[1] 杨莹[1] 周海锋[1] 徐伟[1] 薛禹胜[1] 

机构地区：[1]国网电力科学研究院/南京南瑞集团公司,江苏南京211106

出　　处：《电力系统保护与控制》2015年第7期122-126,共5页Power System Protection and Control

基　　金：国家电网公司资助项目"大电网规划与运行控制技术深化研究重大专项(SGCC-MPLG003-2012)"及"输电线路在线动态增容技术研究与应用"

摘　　要：大电网中N-2组合故障数目巨大,若对每个组合故障分别进行暂态功角稳定评估,难以满足在线评估的时间要求。基于N-2组合故障中第一个元件故障的暂态功角稳定在线评估结果(裕度和主导群发电机的参与因子),结合第一个元件故障的暂态功角稳定主导群中发电机的有功功率对第二个开断元件有功功率的灵敏度,计算出N-2组合故障的暂态功角稳定严重程度排序指标。通过优先对排序在前位的组合故障进行基于详细模型时域仿真的暂态功角稳定量化评估,直至排序号连续的多个组合故障的暂态功角稳定裕度都大于0,则直接判定排序在其后的所有组合故障均是暂态功角稳定的,从而满足N-2组合故障集暂态功角稳定在线评估对计算速度的要求。实际电网算例验证了该方法的有效性。The total number of N-2 faulty element combinations is huge in large scale power system. Transient angle stability analysis for all N-2 contingencies cannot be finished in given time required by online assessment. The index for contingency severity ranking is proposed to filter out slight cases. The index is calculated based on the stability margins and dynamic modes of the N-1 contingency and sensitivity analysis of another faulty element to generators in the critical cluster. Contingencies with larger index are selected for detailed transient angle stability assessment in order. If the transient angle stability margins of multiple sequential contingencies are greater than 0, subsequent contingencies can be judged stable. Real engineering applications in actual power grid have fully confirmed the validity and practicability of this method.

关 键 词：暂态功角稳定 组合故障 故障筛选 参与因子 有功灵敏度 

分 类 号：TM712[电气工程—电力系统及自动化]