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Permanent magnet synchronous motor protection method based on Nuttall window interpolation algorithm

A permanent magnet synchronous motor, interpolation algorithm technology, applied in the direction of automatic disconnection emergency protection device, emergency protection circuit device, emergency protection data processing device, etc., can solve the problem of long action time, can not effectively protect the motor and inverter circuit devices, etc., to achieve the effects of short delay time, shortened protection action time, and simple protection process

Active Publication Date: 2020-06-02
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional relay protection, from the discovery that the current harmonic component exceeds the allowable range of the permanent magnet synchronous motor system to the relay action, takes a long time to operate, and cannot effectively protect the components of the motor and inverter circuit

Method used

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  • Permanent magnet synchronous motor protection method based on Nuttall window interpolation algorithm
  • Permanent magnet synchronous motor protection method based on Nuttall window interpolation algorithm
  • Permanent magnet synchronous motor protection method based on Nuttall window interpolation algorithm

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Embodiment Construction

[0053] Such as figure 1 As shown, a kind of permanent magnet synchronous motor protection method based on adding Nuttall window interpolation algorithm of the present invention comprises the following steps:

[0054] Step 1: Connect high-speed and high-current Darlington tubes in series in the bus bar of the high-power inverter circuit, and each phase on the load side is grounded through the Darlington tubes; the specific protection circuit of the permanent magnet synchronous motor system is as follows: figure 2 shown.

[0055] Step 2: Obtain the current harmonic component when the permanent magnet synchronous motor system works normally through computer simulation;

[0056] Step 3: By adding the Nuttall window interpolation algorithm to analyze the harmonic method, obtain the current harmonic component when the permanent magnet synchronous motor system is working in real time, and the step 3 is specifically:

[0057] Step 3.1: performing Fourier transform on the discrete f...

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Abstract

The invention discloses a permanent magnet synchronous motor protection method based on a Nuttall window interpolation algorithm, and the method comprises the steps: 1, connecting a high-speed large-current Darlington tube in a bus of a large-power inverter circuit in series, and enabling each phase of a load side to be grounded through the Darlington tube; 2, obtaining a current harmonic component of the permanent magnet synchronous motor system during normal operation through computer simulation; 3, analyzing a harmonic method by adding the Nuttall window interpolation algorithm to obtain acurrent harmonic component when the permanent magnet synchronous motor system works in real time; 4, comparing the current harmonic component during normal operation with the current harmonic component during real-time operation, judging whether the circuit is normal or not, returning to the step 3 if the circuit is normal, and otherwise, executing the step 5; 5, controlling the high-speed Darlington transistor connected in series in the bus to be disconnected, and grounding the high-speed Darlington transistor at the front end of the motor through a resistor. According to the method, the protection process becomes simple, the delay time is short, and the effect of rapidly protecting the permanent magnet synchronous motor system is achieved.

Description

technical field [0001] The invention belongs to the field of power electronic transmission and relates to a permanent magnet synchronous motor protection method based on a Nuttall window interpolation algorithm. Background technique [0002] In recent years, with the maturity of the inverter circuit, the permanent magnet synchronous motor system has been further promoted. When the permanent magnet synchronous motor system works normally, the harmonic component of the input current at the motor side is within the allowable range of the permanent magnet synchronous motor system. If the current harmonic component exceeds the allowable range of the permanent magnet synchronous motor system, it will cause a series of problems to the permanent magnet synchronous motor system, such as torque ripple, overheating, and damage to inverter circuit components. Once the current harmonic components are found to exceed the allowable range of the permanent magnet synchronous motor system, p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/08H02H3/52H02H1/00
CPCH02H1/0007H02H1/0092H02H3/52H02H7/0805H02H7/0833
Inventor 钟高刘震
Owner NORTHEASTERN UNIV
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