| 引用本文: | 刘平,张星,黄守道,尹书虎.基于实时结温观测的电动汽车逆变器动态限流策略[J].电力自动化设备,2018,(12): |
| LIU Ping,ZHANG Xing,HUANG Shoudao,YIN Shuhu.Dynamic current limiting strategy of electric vehicle inverters based on real-time junction temperature observation[J].Electric Power Automation Equipment,2018,(12): |
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| 摘要: |
| 针对电动汽车逆变器中功率模块因实时结温过高而造成器件乃至系统失效的问题，提出了基于实时结温观测反馈的逆变器动态电流限幅控制策略。建立绝缘栅双极型晶体管(IGBT)的电热模型，在线观测功率模块中所有IGBT芯片和续流二极管(FWD)芯片的瞬时最大结温；将该热状态以及器件的最大可用热容量输入电流限幅控制器得到逆变器的最大运行电流值，实现逆变器的电流动态限幅控制。测试结果表明，所提控制策略使逆变器安全地工作在最大可用结温范围内，可使逆变器的运行性能极限最大化，提高系统的功率密度和可靠性。 |
| 关键词: 电动汽车 逆变器 结温观测 热容量 电流限幅 可靠性 控制策略 |
| DOI：10.16081/j.issn.1006-6047.2018.12.002 |
| 分类号:TM464;U469.72 |
| 基金项目:国家自然科学基金资助项目(51507055)；湖南省战略性新兴产业科技攻关与重大成果转化专项(2017GK4020)；中国博士后科学基金面上项目(2016M602406) |
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| Dynamic current limiting strategy of electric vehicle inverters based on real-time junction temperature observation |
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LIU Ping1, ZHANG Xing1, HUANG Shoudao1, YIN Shuhu2
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1.College of Electrical and Information Engineering, Hunan University, Changsha 410082, China;2.Hunan VicRuns Electric Co.,Ltd.,Xiangtan 411100, China
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| Abstract: |
| Aiming at the problem that the too high real-time junction temperature of power module in the EV(Electric Vehicle) inverter may cause the device and even the system to break out, the dynamic current limiting control strategy of EV inverters based on the real-time junction temperature observation feedback is proposed. The electro-thermal model of IGBT(Insulated-Gate-Bipolar Transistor) is established to online observe the real-time maximum junction temperature of all IGBT chips and FWD(Fly-Wheel Diode) chips in the power module. Then, the thermal state and the maximum available heat capacity of the devices are imported to the current limiting controller to obtain the maximum operation current of the inverter, which realizes the dynamic current limiting control of the EV inverters. Simulative results show that the proposed strategy enables the inverter to operate safely within the maximum available junction temperature range, and it can also maximize the limit of operation performance for the inverter and improve the power density and reliability of the system. |
| Key words: electric vehicles electric inverters junction temperature observation heat capacity current limiting reliability control strategy |
