The invention relates to a permanent magnet motor traction system, in particular to a permanent magnet traction system protection circuit and method. The technical problem that when an isolation contactor is adopted by an existing permanent magnet motor for protection, when a short-circuit working condition occurs in a converter and a three-pole isolation contactor is clamped, the internal fault of the converter is expanded along with the continuity of short-circuit current is solved. According to the invention, a protection switch is added on the basis of the protection of the existing three-pole isolation contactor. Specifically, a short-circuit contactor is added at the front end of a permanent magnet contactor for realizing three-phase short-circuit protection of a permanent magnet motor. The protection switch is used for emergency disposal under the working condition that two-phase short circuit occurs in the converter, and the short-circuit current of the permanent magnet motor is reduced by short-circuiting three phases of the permanent magnet motor, so that the whole vehicle can run to an adjacent station in a safe state. The permanent magnet direct drive technology is the development direction of the converter in the future, and the successful implementation of the method lays a good foundation for mastering the market occupation of the converter in the future.
本发明涉及永磁电机牵引系统,具体为一种永磁牵引系统保护电路和方法。解决了现有永磁电机采用隔离接触器作为保护时,存在当变流器内部出现短路工况,且三极隔离接触器出现卡合的工况下,随短路电流的持续,变流器内部故障扩大化的技术问题。本发明是在既有的三极隔离接触器的保护基础上,增加保护开关。具体为在永磁接触器前端增加短路接触器,用于实现永磁电机的三相短路保护。保护开关用于在变流器内部出现两相间短路的工况下进行紧急处置,通过短接永磁电机三相,降低永磁电机短路电流,使整车可以维持安全状态下运行到临近车站。永磁直驱技术是未来变流器的发展方向,本发明的成功实施,为在未来占领变流器市场掌握奠定了良好的基础。
Permanent magnet traction system protection circuit and method
一种永磁牵引系统保护电路和方法
2024-03-22
Patent
Electronic Resource
Chinese
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