Method for monitoring and protecting high-voltage disconnection in power generation process of permanent magnet motor
A permanent magnet motor, medium and high voltage technology, applied in the direction of controlling generators, controlling and protecting power generation, emergency protection circuit devices, etc., can solve problems such as detecting the voltage rise rate, to provide accuracy, ensure accuracy, and avoid accidental factors Effect
Pending Publication Date: 2021-12-17
DONGFENG COMML VEHICLE CO LTD
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Problems solved by technology
The technical solution of this patent application cannot detect the voltage rise rate during the power generation process and identify the abnormal voltage rise when the high voltage is disconnected
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[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not limit the present invention.
[0020] Such as figure 1 As shown, the present invention provides a monitoring and protection system for high voltage disconnection in the permanent magnet motor power generation process, which is characterized in that it includes a voltage sensor, a motor controller, and a driving device; the voltage sensor is a voltage sensor built in the motor controller. sensor; the output end of the motor controller is electrically connected to the input end of the driving device; the voltage sensor is used to detect the bus capacitor voltage in real time, and send the detected bus capacitor voltage data to the motor controller; the motor controller Receive the bus capacitor voltage data sent by the voltage sensor in real time, and calculate t...
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The invention provides a method for monitoring and protecting high-voltage disconnection in the power generation process of a permanent magnet motor. The method comprises the following steps that: the voltage of a bus capacitor isdetectedin real time through a built-in voltage sensor of a motor controller, and is transmitted to the motor controller; the motor controller receives the bus capacitor voltage data sent by the voltage sensor in real time and calculates the rising change rate of the bus capacitor voltage according to the bus capacitor data received in real time; the motor controller is provided with a change rate set threshold value of bus capacitor voltage rise; the motor controller compares the calculated change rate of the rise of the bus capacitor voltage with a set threshold value of the change rate of the rise of the bus capacitor voltage, and generates a control instruction according to a comparison result; and the motor controller executes a protection action according to the control instruction. In the power generation process, the voltage rise rate is detected, the abnormal voltage rise when the high voltage is disconnected is identified, and the permanent magnet motor is effectively protected.
Description
technical field [0001] The invention belongs to the technical field of permanent magnet motor control for new energy vehicles, and in particular relates to a monitoring and protection method for high-voltage disconnection during the power generation process of a permanent magnet motor. Background technique [0002] During the power generation process of the permanent magnet motor, if the high-voltage power of the busbar is accidentally cut off (such as loose high-voltage connectors, etc.), the back EMF of the permanent magnet motor will generate high voltage. cause havoc. However, in the prior art, there is a lack of monitoring of the bus capacitor voltage, which cannot effectively prevent the abnormal rise of the bus capacitor voltage from causing risks to the safety of the bus capacitor or the high-voltage system. [0003] Patent application CN202010242089.8 discloses a bus capacitor discharge control method, a control device, home appliances, and a storage medium. Where...
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IPC IPC(8): H02H7/06H02P9/00
CPCH02H7/06H02P9/006
Inventor 钟亮徐晖普刚张国平
Owner DONGFENG COMML VEHICLE CO LTD