基于Y,d11接线变压器的同相供电技术方案

Co-Phase Power Supply Technology Based on Power Transformer With Y,d11 Winding Connection

提出一种基于Y,d11接线变压器的同相供电技术方案,立足于无源对称补偿技术,构建电气化铁路同相供电系统。其主要思想是通过设计单调谐LC滤波器滤除牵引负荷3、5、7次谐波,利用全负序相量图设计对称补偿装置,补偿同相供电带来的负序问题。采用Matlab/Simulink中的电力系统仿真元件库对系统建模并仿真,仿真结果验证了该接线方式的同相供电系统综合补偿方案的正确性和可行性,它不仅能够满足高速、重载机车运行的要求,取消分相绝缘器,而且能够达到三相完全平衡,同时滤除谐波和补偿无功。

Establishing in passive symmetrical compensation technology, a co-phase power supply scheme based on power transformer with Y, dl 1 winding connection is proposed to construct a co-phase power supply system for electric railway. The main thinking of this scheme is to filter the third, fifth and seventh harmonics by designing single-tuned LC filters and to compensate the negative-sequence trouble brought by co-phase power supply through designing a symmetrical compensation device based on total negative-sequence phasor diagram. Utilizing the component library for power system simulation in Maflah/Simulink, the co-phase power supply system is simulated, and simulation results verifies the correctness and feasibility of the comprehensive compensation for the proposed co-phase power supply system based on power transformer with Y,dll winding connection. Adopting the proposed co-phase power supply, not only the requirements to the operation of high-speed and heavy-loaded electric locomotives can be met while the neutral section insulators can be no longer equipped, but also the complete balance among the three phases can be realized, and the harmonic filtering and reactive power compensation can be simultaneously implemented.