组合式同相供电系统容量配置优化及分析

Optimizing and analyzing of capacity configuration in combined co-phase power supply system

为优化组合式同相供电系统同相补偿装置的容量,在牵引变电所端口电气量分析的基础上,利用变压器平衡接线和对称分量法原理,对同相补偿装置和牵引变压器的相对容量(β_1)、电网侧负序和无功功率关系进行了分析。通过分析组合式同相供电系统结构,得到牵引变压器容量、同相补偿装置容量、系统短路容量和负载容量之间的关系,进而求得组合式同相供电系统在完全补偿、满意补偿条件下的β_1值。分析表明,完全补偿时,β_1等于1。无功满意补偿时,高速铁路不设无功补偿,功率因数可满足国标;普速铁路根据负载功率因数设置无功补偿度。负序不平衡度满足国标时,根据短路容量和负载容量设计β_1。最后利用Matlab软件仿真验证了该结果的正确性。

In order to optimize the capacity of co-phase compensation device in combined co-phase power supply system, the relationship among relative capacity （β1） on co-phase compensation device and traction transformer, negative sequence and power factor is analyzed. Based on structure analysis of combined co-phase power supply system, with the usage of principle of transformer connection, the compensation principle of traction substation and symmetrical components theory, the relationship among traction transformer capacity, co-phase compensation device capacity, system short circuit capacity and load capacity is obtained. And then a series of values of β1 on complete compensation and satisfying compensation are analyzed respectively. The search result indicates as follows. The value of β1 is 1 when completely compensated. High speed railway doesn＇t need reactive compensation when satisfying compensation on reactive power because its power factor is nearly 1, but ordinary speed railway set reactive power compensation factor according to power factor of load. Both of them need determine the values of β1 according to the short circuit and load capacity. Eventually simulation results by Matlab verify the validity of analytical calculation.