柔性直流架空线路差模波特征优化方法

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Abstract With the development of flexible DC transmission systems towards high voltage and large capacity, the use of overhead lines has become an inevitable direction for engineering selection. This article is based on engineering application scenarios, combined with traveling wave models and computational complexity, using discrete wavelet transform and multi resolution analysis methods to process electrical quantities such as differential mode traveling wave, DC current and DC voltage, and obtain their respective eigenvalues. The differences between the three are compared and analyzed for faults in the remote area and faults outside the remote area. And for the differential mode traveling wave eigenvalues, the fault condition through transition resistance in the remote region is tested. The results show that the calculation method described in the article has good selectivity and sensitivity for differential mode traveling wave transformation, and the computational complexity is small, which can meet the practical needs of engineering.

Key words： flexible DC overhead lines traveling wave protection wavelet transform

Received: 02 February 2024

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http://dqjs.cesmedia.cn/EN/Y2024/V25/I5/70

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