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Residual voltage estimate based seamless switching power supply method for motor

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

Active Publication Date: 2015-03-04
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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  • Residual voltage estimate based seamless switching power supply method for motor
  • Residual voltage estimate based seamless switching power supply method for motor
  • Residual voltage estimate based seamless switching power supply method for motor

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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. The residual voltage will cause a great impact on the equipment when the backup power is put in. 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 supply method for a moto...

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Abstract

The invention relates to a residual voltage estimate based seamless switching power supply method for a motor. A system adopted in the method comprises a working power supply and a standby power supply which are connected with the motor respectively, wherein a rectifier is connected between outputs of the working power supply and the standby power supply and is further connected with the motor through an inverter. The method comprises steps as follows: S1, modeling of residual voltage of an induction motor after power loss; S2, prediction of residual voltage of a bus of the motor; S3, predication of the initial value of the residual voltage of the bus of the induction motor after power loss: when the initial value of the residual voltage of the bus is smaller than rated voltage of the bus, a UPS (uninterrupted power supply) inverter is started and stabilized in a work state for supplying power to the induction motor; and S4, the phase of the residual voltage of the bus is compared with the phase of voltage of the standby power supply, and the standby power supply is put into use when the phase difference is smaller than 20 degrees. By means of the method, power can be supplied to an important load during power loss of electric supply, output voltage can be also initiatively adjusted, the standby power supply can be rapidly switched and put into use, impact to the load is avoided, and the instant impact current when the standby power supply is put into use can be effectively limited.

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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IPC IPC(8): H02J9/06H02P21/14
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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