含双向变流装置的城轨牵引供电系统协同供电潮流计算  

Calculation of Collaborative Power Flow for Urban Rail Traction Power Supply System with Bidirectional Converter Device

作　　者：刘炜[1] 曾佳欣 马庆安[1] 张戬 熊蓬 戚贺 LIU Wei;ZENG Jiaxin;MA Qingan;ZHANG Jian;XIONG Peng;QI He(School of Electric Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学电气工程学院,四川成都610031

出　　处：《西南交通大学学报》2023年第5期1145-1153,共9页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金(51607148)。

摘　　要：双向变流装置可以有效抑制牵引变电所直流侧网压的波动,减小跨区间传输的电流,限制钢轨电位.鉴于电双向变流装置与整流机组的协同控制策略会对城轨牵引供电系统潮流产生直接影响,提出双向变流装置与24脉波整流机组协同供电的方案,分析该方案下牵引变电所的综合输出外特性;建立计及换流装置精确有功损耗的牵引变电所供电计算模型,并提出考虑滞环比较的多状态切换控制策略,实现含双向变流装置的城轨牵引供电系统协同供电潮流计算;通过与Simulink仿真结果对比,验证算法的有效性及准确性.以某地铁工程为例进行仿真,仿真结果表明:协同供电方案下,牵引网网压上升,全线上、下行钢轨电位最大值分别降低12.6%~15.6%、14.7%~17.5%,直流牵引供电系统损耗、系统综合成本最多可分别降低9.7%、1.17%;随着双向变流装置整流启动电压增大,部分牵引变电所的整流/逆变功率增大,直流牵引供电系统损耗先升高后降低,但钢轨电位变化不大.在实际工程中,双向变流装置的逆变启动电压一定时,适当提高其整流启动电压可以获得更佳的节能效果.The bidirectional converter device can effectively inhibit the fluctuation of the DC-side grid voltage at traction substation,reduce the current transmitted between regions,and limit the rail potential.As the collaborative control strategy of the bidirectional converter and rectifier unit will directly affect the power flow of urban rail traction power supply system,a coordinated power supply scheme composed of a bidirectional converter device and a 24-pulse rectifier is proposed,and the comprehensive output characteristics of traction substation with this scheme are analyzed.The power supply calculation model of traction substation is established,allowing for the accurate active power loss of converter device,and a multi-state switching control strategy with hysteresis comparison is proposed to calculate the cooperative power flow for urban rail traction power supply system with a bidirectional converter device.Compared with Simulink simulation results,the effectiveness and accuracy of the algorithm are verified.In the simulation of a subway project,under the collaborative power supply scheme,when the traction network pressure increases,the maximum rail potential decreases by 12.6%–15.6%and 14.7%–17.5%up and down the whole line,respectively.The loss of DC traction power supply system and the overall cost of the system can be reduced by 9.7%and 1.17%at most.As the rectifier starting voltage of the bidirectional converter device increases,the rectifier/inverter power of some traction substations increases,and the loss of DC traction power supply system increases first and then decreases,but the rail potential changes little.In practice,when the inverter starting voltage of the bidirectional converter is fixed,increasing the rectifier starting voltage appropriately can achieve better energy saving.

关 键 词：城市轨道交通 双向变流装置 输出外特性 潮流计算 协同控制策略 

分 类 号：TM922.3[电气工程—电力电子与电力传动]