基于Dd接线变压器及静止无功发生器的电气化铁路同相供电综合补偿方案

为解决电气化铁路以负序为主的电能质量问题,提出在牵引变电所设置基于Dd接线变压器及静止无功发生器的负序补偿装置的电气化铁路同相供电综合补偿方案,根据负序补偿装置的结构,将同相供电综合补偿方案分为2端口补偿模式和3端口补偿模式;通过定义无功补偿度和负序补偿度,构建2端口补偿模式和3端口补偿模式下的综合补偿数学模型,基于此定义最大无功补偿量,给出确定综合补偿方案的流程;针对不同补偿模式,提出相应的控制策略,并仿真验证综合补偿方案及控制策略的正确性和可行性。结果表明:综合补偿方案在实现公共连接点处负序综合补偿的同时,还能兼顾该处牵引负荷可能引起的谐波的补偿。

Comprehensive Compensation Scheme of Cophase Power Supply for Electrified Railway with Dd Transformer and Static Var Generator

In order to solve the problem of the negative sequence dominated power quality for electrified railway,the comprehensive compensation schemes of cophase power supply for electrified railway were proposed with the negative sequence compensator based on Dd transformer and static var generator installed in traction substation.According to the structure of the negative sequence compensator,the comprehensive compensation schemes of the cophase power supply were divided into 2-port compensation mode and 3-port compensation mode.By defining the degree of reactive power compensation and the degree of negative sequence compensation,the mathematical models of comprehensive compensation under 2-port compensation mode and 3-port compensation mode were constructed.Based on this,the maximum reactive power of compensation was defined,and the process to determine the comprehensive compensation scheme was given.The corresponding control strategies were proposed for different compensation modes,and the correctness and feasibility of the comprehensive compensation schemes and control strategies were verified by simulation.Results show that the proposed schemes can achieve the comprehensive compensation of negative sequence at the point of common coupling while taking into account the compensation of harmonics which may be caused by the traction loads there.