Comprehensive Compensation Schemes of Cophase Power Supply of Electrified Railway Based on YNd Transformer and Static Var Generator
Wang Hui1, Li Qunzhan1, Li Jin2, Xie Shaofeng1, Huang Wenxun2
1. School of Electric Engineering Southwest Jiaotong University Chengdu 611756 China 2. China Railway First Survey and Design institute Group Co. Ltd Xi’an 710043 China
Abstract:Aiming at the mainly problem of power quality of electrified railways with negative sequence, a comprehensive compensation scheme and control strategy for cophase power supply of electrified railway based on YNd transformer and static var generator are proposed. Taking YNd11 transformer as an example, the comprehensive compensation schemes of cophase power supply based on YNd transformer and static var generator are divided into two-port compensation mode and three-port compensation mode. The basic principle of negative sequence compensation is studied, and the mathematical models of two-port compensation mode and three-port compensation mode of comprehensive compensation of cophase power supply are constructed, with which the method to determine the compensation scheme is given. According to different compensation modes, corresponding control strategies are proposed. According to different mathematical models of compensation mode, the corresponding compensation control strategies are proposed, and the correctness and effectiveness of the comprehensive compensation scheme and control strategy of cophase power supply are verified by simulation. The results show that the comprehensive compensation scheme can achieve the treatment of negative sequence problems caused by traction load at point of common coupling, with which will not bring about new power quality problems. At the same time, it can also deal with the harmonic problems caused by traction load at point of common coupling.
王辉, 李群湛, 李晋, 解绍锋, 黄文勋. 基于YNd变压器与静止无功发生器的电气化铁路同相供电综合补偿方案[J]. 电工技术学报, 2020, 35(17): 3739-3749.
Wang Hui, Li Qunzhan, Li Jin, Xie Shaofeng, Huang Wenxun. Comprehensive Compensation Schemes of Cophase Power Supply of Electrified Railway Based on YNd Transformer and Static Var Generator. Transactions of China Electrotechnical Society, 2020, 35(17): 3739-3749.
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