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A motor seamless switching power supply method based on residual voltage estimation

A technology of seamless switching and power supply method, which is used in the control of generators, motor generators, electronic commutation motor control, etc., and can solve problems such as excessive phase difference

Active Publication Date: 2017-12-22
GUANGDONG POWER GRID CO LTD DONGGUAN POWER SUPPLY BUREAU +1
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Problems solved by technology

Therefore, when the high-voltage large-capacity induction motor is powered off and the backup power supply is used to restore the power supply, it must face the problem of excessive phase difference between the backup power supply and the residual voltage of the motor load. There is no ideal solution to this problem at present.

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  • A motor seamless switching power supply method based on residual voltage estimation
  • A motor seamless switching power supply method based on residual voltage estimation
  • A motor seamless switching power supply method based on residual voltage estimation

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specific Embodiment approach

[0102] The residual voltage attenuation phase of the induction motor after de-energization is as follows: figure 1 As shown, after power failure, there is a residual voltage on the motor bus. The residual voltage is a transient quantity with the same phase and amplitude as the mains power supply. The residual voltage will cause a great impact on the equipment when the backup power supply is switched on. Since there is a residual voltage on the bus on the load side, when power is applied to the load, there will be a voltage difference between the residual voltage and the power supply voltage, such as figure 2 and image 3 shown, where u s is the residual voltage of the bus on one side of the motor, u B is the backup power supply voltage, Δu is the vector difference between the two, and Δθ is the phase difference between the two. If there is a phase difference between the two voltages, a surge voltage will appear at the motor terminals.

[0103] The seamless switching power...

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Abstract

A power supply method for seamless switching of motors based on residual voltage estimation: the system adopted in the method includes working and standby power supplies respectively connected to the motor, and a rectifier is connected between the output of the working and standby power supplies, and the rectifier is also connected through an inverter Motor; method: S1, modeling the residual voltage of the induction motor after de-energization; S2, predicting the residual voltage of the motor bus; S3, predicting the initial value of the residual voltage of the bus after the induction motor is de-energized, when the initial value of the residual voltage of the bus is less than the rated voltage of the bus , make sure to start the UPS inverter, so that the UPS inverter is stable in the working state of supplying power to the induction motor; S4, compare the phase of the bus residual voltage with the phase of the backup power supply voltage, and when the phase difference between the two is less than 20°, the backup Power on. The invention can not only provide short-term power supply for important loads when the mains power fails, but also actively adjust the output voltage, quickly switch the standby power supply to avoid impact on the load, and can effectively limit the instantaneous impact current of the standby power supply.

Description

technical field [0001] The invention relates to a method for seamlessly switching power supply when a motor loses power, in particular to a method for seamlessly switching power supply for a motor based on residual voltage estimation. Background technique [0002] When the high-voltage large-capacity induction motor bus loses power, there will be residual voltage, which will have a great impact on switching the backup power supply. The low-voltage starting mode of the existing switching device is realized by low-voltage detection and fixed delay. When the amplitude of the residual voltage of the induction motor bus is low, the impact on the induction motor is relatively large when the power is switched. Therefore, when the high-voltage large-capacity induction motor is powered off and the backup power supply is used to restore the power supply, it must face the problem of excessive phase difference between the backup power supply and the residual voltage of the motor load, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J9/06H02P21/28H02P21/26
Inventor 曾伟章李雄峰罗建何坚翟照辉任宗基钟振兴吴杰辉周海潇杨沛霖叶俊鸿李晓钧罗志勇姚志良邹小辉黄世昌戴华刘超
Owner GUANGDONG POWER GRID CO LTD DONGGUAN POWER SUPPLY BUREAU
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