基于静止无功发生器的双流制牵引供电系统控制策略

Control Strategy of Double-current Traction Power Supply System Based on Static Var Generator

基于静止无功发生器的双流制牵引供电系统可用于交直流供电系统并存的供电区段,也能为多制式机车提供出厂试验,减少供电设备,提高效率,并解决以负序为主的电能质量问题。提出双流制供电系统的结构,根据负荷的运行工况分别研究2种运行方式的基本原理,构建负序补偿数学模型并推导静止无功发生器容量的计算式。基于瞬时无功理论,研究该方案中静止无功发生器的控制策略。搭建仿真模型,仿真结果表明在不同的负荷运行工况下,双流制供电系统既能为交流负荷和直流负荷提供运行功率,也能对公共连接点处的负序进行治理,验证了补偿方案的正确性与可行性。

The double-current traction power supply system based on static var generator can be used in the power supply section where AC and DC power supply system coexist,and can also provide factory test for multi-system locomotive,reduce power supply equipment,improve efficiency,and solve the negative sequence power quality problem.The structure of the double-current power supply system is proposed,and the basic principles of the two operating modes are studied respectively according to the operating conditions of the load.The negative sequence compensation mathematical model is constructed and the calculation formula of the capacity of the static var generator is derived.Based on instantaneous reactive power theory,the control strategy of static var generator in this scheme is studied.Built the simulation model,the simulation results show that under different load operating conditions,the double-current power supply system can not only provide running power for AC load and DC load,but also manage the negative sequence at the point of common coupling,which verifies the correctness and feasibility of the compensation scheme.