基于移相全桥DC-DC变换器的城市轨道交通车辆高频充电机软开关实现方法
王哲1,2,3李思睿4马驰1,2,3程龙1,2,3刘东辉1,2,3宋术全1,2,3
Realization Method for Urban Rail Transit Vehicle High-frequency Charger Soft-Switching Based on PS-FBC
WANG ZheLI Sirui, MA ChiCHENG LongLIU DonghuiSONG Shuquan
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作者信息:1.中国铁道科学研究院集团有限公司机车车辆研究所， 100081， 北京
2.动车组和机车牵引与控制国家重点实验室， 100081， 北京
3.北京纵横机电科技有限公司， 100094， 北京
4.天津一号线轨道交通运营有限公司， 300350， 天津
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Affiliation:Locomotive and Car Research Institute, China Academy of Railway Sciences Group Co., Ltd, 100081, Beijing, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2023.10.006
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中图分类号/CLCN:TN624∶U270.38+1
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栏目/Col:研究报告
摘要:
目的：为了提高城市轨道交通车辆充电机的供电效率和功率密度，基于软开关技术，对PS-FBC(移相全桥DC-DC变换器)在轨道交通车辆高频充电机中的应用进行了研究。方法：分析了PS-FBC电路在3种工作模态下的运行特点，建立了过谐振模态中高频电流与电容电压的时域解析数学模型。基于该模型深入分析了电压极性翻转特性，探究了死区效应下电压极性翻转的触发条件，提出一种死区时间优化设计方法。通过PSIM软件对PS-FBC时域解析数学模型进行了仿真验证。结果及结论：PS-FBC工作在重载且过谐振条件时，将开关频率设置在靠近谐振频率附近，可以避免电压极性翻转现象的发生。通过合理设计开关死区时间，可以改善软开关的工作特性，降低PS-FBC的系统损耗，提高城市轨道交通车辆充电机的供电效率。通过多种工况下的仿真结果，验证了死区时间优化设计方法的有效性。
Abstracts:
Objective: In order to enhance the power supply efficiency and power density of chargers for urban rail transit vehicles, the application of PS-FBC (phase-shifted full-bridge DC-DC converter) based on soft-switching technology is investigated.Method: The operational characteristics of the PS-FBC circuit in three working modes are analyzed, and a time-domain analytical mathematical model is established for high-frequency current and capacitor voltage in the over-resonance mode. The voltage polarity reversal characteristics are thoroughly examined based on this model. Additionally, the triggering conditions for voltage polarity reversal under dead-zone effects are explored, and an optimization method for dead-zone time design is proposed. The PS-FBC time-domain analytical mathematical model is simulated and verified using PSIM (physical security information management) software.Result & Conclusion: When the PS-FBC operates under heavy load and over-resonance conditions, setting the switching frequency close to the resonance frequency can prevent voltage polarity reversal. By designing the switch dead-zone time reasonably, the working characteristics of soft-switching can be improved, reducing system losses in the PS-FBC, enhancing the power supply efficiency of chargers for urban rail transit vehicles. Simulation results under various working conditions validate the effectiveness of the dead-zone time optimization design method.
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