城市轨道交通车辆辅助高压母线环形馈线控制方案
杨丽1胡金鑫2柴金川3
Auxiliary Highvoltage Bus Ring Feeder Control Scheme for Urban Rail Transit Vehicle
YANG LiHU JinxinCHAI Jinchuan
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作者信息:1.中车南京浦镇车辆有限公司， 210031， 南京
2.南京浩明工贸实业有限公司， 210009， 南京
3.中国铁道科学研究院集团有限公司国家铁道试验中心， 100015， 北京
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Affiliation:CRRC Nanjing Puzhen Co., Ltd., 210031, Nanjing, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2023.09.043
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中图分类号/CLCN:U231.8
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栏目/Col:应用技术
摘要:
目的：为解决地铁车辆在车间维护时，由于不规范操作引起的维护人员异常触电问题，提出一种城市轨道交通车辆辅助高压母线环形馈线控制方案。方法：所提方案主要从高压箱安全回路、馈线接触器箱安全环路、环形馈线控制及中压母线控制4个方面进行设计。在车辆高压箱前盖板设置行程开关、车间电源插座盖板位置开关和接地隔离开关。既有高压电路中增加馈线接触器箱，其包含馈线接触器、低压控制电路及箱体盖板行程开关。设置网络控制单元及逻辑控制单元对高压箱前盖板状态、车间电源状态、接地隔离开关状态及馈线接触器箱盖板状态进行采集，并根据盖板及隔离开关位置状态进行逻辑诊断。结果及结论：①当上述各状态均在正常位置时，馈线接触器线圈得电，高压馈线贯穿全车两个动力单元。②当任一盖板状态发生异常断开时，两个动力单元的馈线接触器线圈失电，高压馈线断开且仅提供所在动力单元内部的供电；同时，逻辑诊断单元控制三相并网继电器失电，控制三相母线接触器断开，三相母线只进行本动力单元并网。③除受高压安全环路控制外，三相母线还能进行自身状态保护，无短路故障时闭合三相母线接触器，短路故障时断开三相接触器，辅助逆变器诊断为内部短路，切除相应辅助逆变器后重新并网；若辅助逆变器诊断为外部短路，则断开三相接触器。④整车网络故障时，当辅助逆变器检测到内部短路故障，则断开三相接触器。
Abstracts:
Objective: To address the issue of abnormal electric shock incidents among maintenance personnel caused by improper operations during metro vehicle workshop maintenance, a control scheme for the auxiliary highvoltage bus ring feeder in urban rail transit vehicle is proposed. Method: The proposed scheme is designed based on four aspects: highvoltage box safety circuit, feeder contact box safety loop, ring feeder control, and mediumvoltage bus control. Trip switch, workshop power socket cover position switch and grounding isolation switch are installed on the front cover of vehicle highvoltage box. A feeder contact box is added to the existing highvoltage circuit, which includes the feeder contactor, lowvoltage control circuit, and the trip switch on the box cover. A network control unit and a logic unit are set up to collect the status of highvoltage box front cover, workshop power, grounding isolation switch, and feeder contactor box cover, and perform logic diagnostics based on the cover and switch position status. Result & Conclusion: (1) When all the aforementioned status are in the normal position, the feeder contactor coil is energized, and the highvoltage feeder extends through two power units of the entire vehicle. (2) If any cover status is abnormally disconnected, the feeder contactor coils of both power units lose power, resulting in disconnection of the highvoltage feeder, providing power only within the local power unit. Simultaneously, the logic diagnostic unit controls the power loss of threephase gridrelay, disconnecting the threephase bus contactor, and the threephase bus is connected only within the local power unit. (3) In addition to highvoltage safety loop control, the threephase bus can also protect its own status. When there is no shortcircuit fault, the threephase bus contactors are closed, and in case of shortcircuit fault, the contactors are disconnected; when the auxiliary inverter diagnosis indicates an internal shortcircuit, the corresponding auxiliary inverter is cut off and reconnected to the grid. If the auxiliary inverter diagnosis indicates an external shortcircuit, the threephase contactors are disconnected. (4) In case of a network failure throughout the vehicle, and the auxiliary inverter detects an internal shortcircuit fault, the threephase contactors are disconnected.
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