Study on Impact on Negative Sequence of Single Three-Phase Combined Co-Phase Power Supply System
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摘要:负序是我国电气化铁路牵引供电系统中存在的主要电能质量问题之一，为研究单三相组合式同相供电系统负序的影响情况，介绍了单三相组合式同相供电系统结构及特点，采用通用方法分别计算了异相供电系统和单三相组合式同相供电系统下牵引负荷产生的负序电流，并对比分析了单三相组合式同相供电系统和异相供电系统中列车处于牵引或再生制动状态下负序影响情况，计算结果表明，单三相组合式同相供电系统平衡变压器绕组容量利用率比YNvd平衡变压器高，其容量利用率最小为85.7%.
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关键词:
- 单三相组合式同相供电系统/
- 再生制动/
- 负序
Abstract:The negative sequence is one of the main power quality issues in the tractive power supply system in our country. The structure and characteristics of a single three-phase combined co-phase power supply system are introduced herein, to study the impact of the negative sequence of a single three-phase combined co-phase power supply system. Negative-sequence currents produced by traction loads of the different phase power supply system and the single three-phase combined co-phase power supply system were calculated with the generalized method. In addition, the impact of a single three-phase combined co-phase power supply system and the different phase power supply system on the negative sequence were analyzed in the situation when traction loads are under traction and regenerative braking. The calculation results indicated that capacity utilization of single three-phase combined-type balanced transformer winding is at least 85.7%. This is higher than the YNvd connected transformer, and the impact of train regenerative braking is lower on the negative sequence. -
图 2单三相组合式平衡变压器接线方式
Figure 2.Connection mode of single three-phase combined-type balanced transformer
图 3容量利用率与两端口负荷比的关系
Figure 3.Relationship between the capacity utilization and the two-port load ratio
图 4单三相组合式原、次边电流相量关系
Figure 4.Relationship between the primary and secondary current phases of single three-phase combined-type
图 5负序电流比例系数随负荷波动关系
Figure 5.Relationship between the negative sequence current ratio and the load fluctuation
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