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Permanent magnet synchronous motor control algorithm for improving transient stability of small capacity dc bus capacitor voltage

A DC bus capacitor and permanent magnet synchronous motor technology, applied in the field of permanent magnet synchronous motor control algorithm, can solve the problems of large input current distortion rate of the grid, unstable DC bus voltage, low system power factor, etc. Lower system cost and less energy storage

Active Publication Date: 2017-05-10
SOUTHEAST UNIV
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  • Application Information

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Problems solved by technology

Capacitors with small capacity have less energy storage, and the DC bus voltage is unstable and fluctuates greatly. When the motor speed is high and the instantaneous value of the grid voltage is low, the back electromotive force of the motor will increase the voltage on the capacitor. At this time, the voltage on the capacitor is higher than The absolute value of the grid voltage, the rectifier diode is turned off, the distortion rate of the input current of the grid becomes larger, causing harmonic pollution of the grid, and the power factor of the whole system is low. Therefore, the control of the DC bus voltage becomes the key to reduce the distortion rate of the input current of the grid The essential

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  • Permanent magnet synchronous motor control algorithm for improving transient stability of small capacity dc bus capacitor voltage
  • Permanent magnet synchronous motor control algorithm for improving transient stability of small capacity dc bus capacitor voltage
  • Permanent magnet synchronous motor control algorithm for improving transient stability of small capacity dc bus capacitor voltage

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Embodiment Construction

[0025] The present invention will be further explained below in conjunction with the accompanying drawings.

[0026] Such as figure 1 As shown, a permanent magnet synchronous motor control algorithm to improve the transient stability of the small-capacity DC bus capacitor voltage includes the following steps:

[0027] (1) Obtain the current motor rotor position angle θ through the encoder or Hall position sensor, and calculate the actual speed ω of the motor rotor. Then, the actual speed ω of the motor rotor is compared with the given speed ω through negative feedback. * Constitute the speed outer loop, subtract the two to get the speed deviation signal Δω, the output signal of the speed deviation signal after the speed regulator is used as the motor torque given value T ** .

[0028] (2), set the motor torque given value T in step (1) ** After a low-pass filter or Fourier decomposition, the torque given value T is obtained ** , Torque given value T ** After passing thro...

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Abstract

The invention discloses a permanent magnet synchronous motor control algorithm for improving the transient stability of a small capacity DC bus capacitor voltage. According to the difference between a DC bus voltage and an absolute value of a grid voltage, a given component of a motor direct-axis current is adjusted, the transient stability of the DC bus voltage is improved, and the distortion rate of a grid input current is reduced. A small capacity thin-film capacitor is used for replacing a power factor correction circuit to extend the service life of the entire system. However, the capacitance of the thin-film capacitor is small and the capacitor voltage is susceptible to motor back electromotive force, which results in a series of problems of a high distortion rate of the grid input current and the like. For this reason, the invention adjusts the given component of the direct-axis current based on the difference between the DC bus voltage and the absolute value of the grid voltage, and adopts an internal model controller or a repetitive controller or a PR controller as a current controller to realize the fast tracking of period demand signals by d-q currents of the motor.

Description

technical field [0001] The invention relates to a control algorithm of a permanent magnet synchronous motor for improving the transient stability of a small-capacity DC bus capacitor voltage. Background technique [0002] The permanent magnet synchronous motor has the advantages of low loss, high efficiency, high power density and high reliability, and is widely used in household appliances. The hardware circuit of the permanent magnet synchronous motor drive system is mainly composed of rectifier diodes, power factor correction circuits and three-phase voltage The control system requires energy storage inductors and electrolyte capacitors, which greatly increases the volume of the drive system. The life of the electrolyte capacitors tends to decrease with the increase of the ambient temperature, which seriously restricts the reliability of the entire system. The loss of the tube is large, and the utilization efficiency of the whole system is low. [0003] The traditional p...

Claims

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Application Information

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IPC IPC(8): H02P21/22H02P21/14H02P21/20
CPCH02P21/0003H02P21/14
Inventor 林明耀张贝贝台流臣谭广颖付兴贺刘凯
Owner SOUTHEAST UNIV
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