N-2组合故障集的暂态功角稳定在线快速评估

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...

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Bibliographic Details
Published in电力系统保护与控制 Vol. 43; no. 7; pp. 122 - 126
Main Author 徐泰山 鲍颜红 杨莹 周海锋 徐伟 薛禹胜
Format Journal Article
LanguageChinese
Published 国网电力科学研究院/南京南瑞集团公司,江苏 南京,211106 2015
Subjects
参与因子
故障筛选
暂态功角稳定
有功灵敏度
组合故障
组合故障
有功灵敏度
participation factor
active power sensitivity
transient angle stability
contingency screening
故障筛选
暂态功角稳定
参与因子
faulty element combination
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ISSN1674-3415

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Summary: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。
Bibliography:XU Taishan, BAO Yanhong, YANG Ying, ZHOU Haifeng, XU Wei, XUE Yusheng （State Grid Electric Power Research Institute/NARI Group Corporation, Nanjing 211106, China）
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.
41-1401/TM
ISSN:1674-3415