摘要
针对高速电气化铁路特有供电模式和电力机车复杂运行工况导致牵引供电系统负序、电压波动和功率因数低等电能质量问题,以V/v接线变压器的牵引变电所为背景,开发了基于降压变压器二次侧绕组多重化、多个背靠背H桥功率单元并联接入的功率融通型电能质量综合治理装置。文章介绍了其主电路拓扑结构、工作原理,及其等效电气模型;详细论述了有功融通、无功参考电流计算以及基于dq解耦控制方法。该功率融通型电能质量综合治理装置在某牵引变电所实现挂网运行后,系统110 k V侧三相电压和电流保持同相位,电压波动小,电压不平衡度基本控制在0.2%左右,功率因数提高至0.95以上,从而验证了该装置主电路参数、控制保护系统等的正确性和可行性。
Power quality problems of negative sequence current, voltage fluctuation and low power factor in traction power supply system are caused by the high-speed electric railway＇s unique power mode and complex operating conditions of electric locomotives. Based on the traction substation with V/v connection transformer, a power quality comprehensive control device with active power transfer was developed on the basis of the secondary windings of step-down transformer multiplexing and some back-to-back H-bridge power units in parallel. The main circuit topology, operating principle and equivalent electrical model were analyzed. Moreover, the reference value calculation of active current, reactive current, harmonic and decoupling control method based on dq were discussed. After the operation of equipments in a traction substation, three-phase voltage and current of 110 kV side keep the same phase, voltage fluctuation is small, voltage unbalance is about 0.2%, system power factor is increased to 0.95. The results verify that the equipment＇s main circuit parameters, control and protection system are accurate and feasible.
出处
《大功率变流技术》
2015年第4期61-64,79,共5页
HIGH POWER CONVERTER TECHNOLOGY
关键词
高速铁路
供电系统
功率融通
负序电流
无功补偿
解耦控制
high-speed railway
power supply
power transfer
negative sequence current
reactive power compensation
decouplingcontrol
