發(fā)布時間：2018-12-08 10:19

【摘要】：隨著電力系統(tǒng)規(guī)模日益擴大,輸電網(wǎng)絡(luò)結(jié)構(gòu)也愈加復(fù)雜,傳統(tǒng)的雙端行波故障測距方法將無法滿足輸電網(wǎng)絡(luò)故障測距準確性和可靠性的要求。為此,論文以圖論為數(shù)學(xué)基礎(chǔ),提出了一種基于雙端行波法的多端輸電線路故障測距改進算法,并通過仿真驗證了該方法的可靠性和實用性。本文首先介紹了行波故障測距在國內(nèi)外的發(fā)展歷程和多端輸電線路故障測距的研究現(xiàn)狀�，F(xiàn)有的基于小波變換的多端輸電線路故障測距算法和基于希爾伯特-黃變換的多端輸電線路故障測距算法都只能進行傳統(tǒng)的雙端行波故障測距。當其中一端行波故障測距裝置出現(xiàn)故障時,就會造成故障測距失敗�；趫D論的網(wǎng)絡(luò)故障行波測距方法構(gòu)建測距網(wǎng)絡(luò),利用最短路徑算法,將復(fù)雜的多端輸電網(wǎng)絡(luò)簡化成輻射型網(wǎng)絡(luò),并運用數(shù)據(jù)加權(quán)融合技術(shù)對故障位置進行測距。即使在行波裝置一端失信時也能獲得準確的故障測距結(jié)果。但該算法在對故障測距結(jié)果進行加權(quán)融合處理時,只考慮了故障行波傳輸路徑上變電站對測距結(jié)果的作用,忽略了相鄰變電站的輸電線路傳輸距離對故障測距精度的影響。為了提高該算法的精度和可靠性,本文對這一算法進行了改進,使算法精度更高,可靠性更強。最后,引入220kV輸電網(wǎng)故障實例,運用Matlab建立仿真模型,并對以上三種測距方法進行仿真分析。仿真結(jié)果表明,與傳統(tǒng)的小波變換法和HHT故障測距法相比,本文提出的改進的基于雙端行波法的多端輸電線路故障測距方法具有較高的測距精度和可靠性。并且不受故障類型、部分節(jié)點記錄錯誤時間的影響,適用于多端輸電線路故障測距。該研究成果將為下一步開發(fā)應(yīng)用行波保護裝置奠定理論和技術(shù)基礎(chǔ)。
[Abstract]:With the increasing scale of power system and the complexity of transmission network structure, the traditional dual-terminal traveling wave fault location method will not meet the requirements of accuracy and reliability of fault location in transmission network. Therefore, based on graph theory, an improved fault location algorithm for multi-terminal transmission lines based on two-terminal traveling wave method is proposed, and the reliability and practicability of the method are verified by simulation. This paper first introduces the development of traveling wave fault location at home and abroad and the research status of multi-terminal transmission line fault location. The existing multi-terminal transmission line fault location algorithms based on wavelet transform and Hilbert-Huang transform can only carry out traditional two-terminal traveling wave fault location. When one end of the traveling wave fault location device failure, it will cause fault location failure. The fault location network is constructed based on graph theory. The complex multi-terminal transmission network is simplified into a radiative network by using the shortest path algorithm and the data weighted fusion technique is used to locate the fault location. Accurate fault location results can be obtained even when one end of the traveling wave device is discredited. However, in the weighted fusion of fault location results, the algorithm only considers the effect of substation on fault location result on the transmission path of fault traveling wave, and neglects the influence of transmission distance of transmission line of adjacent substation on fault location accuracy. In order to improve the accuracy and reliability of the algorithm, the algorithm is improved in this paper, which makes the algorithm more accurate and reliable. Finally, an example of fault in 220kV transmission network is introduced, and the simulation model is established by Matlab, and the above three fault location methods are simulated and analyzed. The simulation results show that compared with the traditional wavelet transform and HHT fault location method, the improved fault location method based on two-terminal traveling wave method has higher accuracy and reliability. And it is not affected by fault type, and some nodes record error time, so it is suitable for fault location of multi-terminal transmission line. The research results will lay a theoretical and technical foundation for the further development and application of traveling wave protection device.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM75

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本文編號：2368179