基于過載影響因子的N -2故障快速篩選和排序方法
李本瑜1,游昊1,任文鵬2,秦昊2
(1 云南電力調度控制中心, 云南 昆明 650011;2 武漢佳華創(chuàng)新電氣有限公司,湖北 武漢 430074)
摘 要:為了保證大規(guī)?;ヂ撾娋W的安全和穩(wěn)定運行,需要研究適用于繼電保護元件動作特性分析和評估的初始故障篩選和排序方法。以N-2故障為分析目標,提出了一種基于過載影響因子的快速故障篩選和排序方法。根據所定義的過載影響因子,將所有待分析故障分成兩類并行掃描然后求取并集,再結合行為指標所表征的嚴重程度對所篩選處的故障進行排序。算例結果表明,所提方法能有效縮小N-2故障集規(guī)模,不僅能節(jié)省較多計算量,還可避免排序指標固有的片面性及不確定性。
關鍵詞:連鎖故障;故障篩選;故障排序;距離保護
中圖分類號:TM773 文獻標識碼:A 文章編號:1007-3175(2019)05-0001-06
Fast N-2 Contingency Screening and Ranking Method Based on Line Overload Impact Factor
LI Ben-yu1, YOU Hao1, REN Wen-peng2, QIN Hao2
(1 Yunnan Electric Power Dispatching and Controlling Center, Kunming 650011 , China;
2 Wuhan Jiahua Innovation Electric Co., Ltd, Wuhan 430074, China)
Abstract: In order to keep the secure and stable operation of large-scale interconnected network, the contingency screening and ranking method, which is necessary for analyzing and evaluating characteristics of relay devices, is in need. Taking the N-2 malfunction as an analysis target, this paper proposed a kind of fast contingency screening and ranking method based on line overload impact factor. According to the defined line overload impact factor, this paper divided the objective contingencies into two categories, got union set after scanning in parallel and ranked the contingency according to the severity indicated by the performance index. The case study results prove that the proposed method could effectively reduce the N-2 malfunction set scale. The computation cost is saved by the proposed method, while the innate defects of the factor-based methods are averted.
Key words: cascading failure; contingency screening; contingency ranking; distance protection
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