Unlike the traditional traction power supply system which enables the electrified railway traction sub- station to be connected to power grid in a way of phase rotation, a new generation traction power supply system w...Unlike the traditional traction power supply system which enables the electrified railway traction sub- station to be connected to power grid in a way of phase rotation, a new generation traction power supply system without phase splits is proposed in this paper. Three key techniques used in this system have been discussed. First, a combined co-phase traction power supply system is applied at traction substations for compensating negative sequence current and eliminating phase splits at exits of substations; design method and procedure for this system are presented. Second, a new bilateral traction power supply technology is proposed to eliminate the phase split at section post and reduce the influence of equalizing current on the power grid. Meanwhile, power factor should be adjusted to ensure a proper voltage level of the traction network. Third, a seg- mental power supply technology of traction network is used to divide the power supply arms into several segments, and the synchronous measurement and control technology is applied to diagnose faults and their locations quickly and accurately. Thus, the fault impact can be limited to a min- imum degree. In addition, the economy and reliability of the new generation traction power supply system are analyzed.展开更多
研究了燃料电池系统测试平台空气供给系统背压阀的选取,目的是改善空气系统的动态响应特性。以15 k W燃料电池系统测试平台为例,给出系统相关参数的计算方法,对比分析了不同流量特性背压阀对空气供给系统的影响,对比了同一背压阀对不同...研究了燃料电池系统测试平台空气供给系统背压阀的选取,目的是改善空气系统的动态响应特性。以15 k W燃料电池系统测试平台为例,给出系统相关参数的计算方法,对比分析了不同流量特性背压阀对空气供给系统的影响,对比了同一背压阀对不同功率系统特性的影响和不同背压阀对同一系统特性的影响。采用已发表文献中的试验数据搭建了燃料电池系统模型并进行了开环压力控制系统动态响应特性的仿真,结果表明等百分比型背压阀更适合系统需求,适当选取Kv值(流量系数)较小的背压阀可以改善系统的调节精度,但对系统压力动态响应特性影响不大。展开更多
基金supported by the National Natural Science Funds of China (Nos. 51307143 and 51307142)Technology Research and Development Program of China Railway Corporation (No. 2014J009-B)
文摘Unlike the traditional traction power supply system which enables the electrified railway traction sub- station to be connected to power grid in a way of phase rotation, a new generation traction power supply system without phase splits is proposed in this paper. Three key techniques used in this system have been discussed. First, a combined co-phase traction power supply system is applied at traction substations for compensating negative sequence current and eliminating phase splits at exits of substations; design method and procedure for this system are presented. Second, a new bilateral traction power supply technology is proposed to eliminate the phase split at section post and reduce the influence of equalizing current on the power grid. Meanwhile, power factor should be adjusted to ensure a proper voltage level of the traction network. Third, a seg- mental power supply technology of traction network is used to divide the power supply arms into several segments, and the synchronous measurement and control technology is applied to diagnose faults and their locations quickly and accurately. Thus, the fault impact can be limited to a min- imum degree. In addition, the economy and reliability of the new generation traction power supply system are analyzed.
文摘研究了燃料电池系统测试平台空气供给系统背压阀的选取,目的是改善空气系统的动态响应特性。以15 k W燃料电池系统测试平台为例,给出系统相关参数的计算方法,对比分析了不同流量特性背压阀对空气供给系统的影响,对比了同一背压阀对不同功率系统特性的影响和不同背压阀对同一系统特性的影响。采用已发表文献中的试验数据搭建了燃料电池系统模型并进行了开环压力控制系统动态响应特性的仿真,结果表明等百分比型背压阀更适合系统需求,适当选取Kv值(流量系数)较小的背压阀可以改善系统的调节精度,但对系统压力动态响应特性影响不大。
