Permanent magnet synchronous motor control algorithm of small-capacity thin-film capacitor transducer system

A permanent magnet synchronous motor and film capacitor technology, applied in motor generator control, electronic commutation motor control, vector control system, etc., can solve the harmonic pollution of power grid, low system power factor, reduction of diode conduction angle, etc. problems, to achieve the effect of reducing system cost, improving impedance model, and improving stability

Active Publication Date: 2017-01-11
SOUTHEAST UNIV
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Problems solved by technology

Small-capacity capacitors do not have the function of energy storage, and the voltage across the film capacitor will fluctuate with the grid voltage. When the minimum voltage of the DC bus voltage is relatively low, the distortion rate of the input current of the grid is low, but when the motor runs a

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  • Permanent magnet synchronous motor control algorithm of small-capacity thin-film capacitor transducer system
  • Permanent magnet synchronous motor control algorithm of small-capacity thin-film capacitor transducer system
  • Permanent magnet synchronous motor control algorithm of small-capacity thin-film capacitor transducer system

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Embodiment Construction

[0023] The present invention will be further explained below in conjunction with the accompanying drawings.

[0024] Such as figure 1 As shown, a permanent magnet synchronous motor control algorithm for a small-capacity film capacitor inverter system includes the following steps:

[0025] (1), get the current motor rotor position angle θ through the encoder or Hall position sensor, and calculate the actual speed ω of the motor; then the current motor rotor speed ω through negative feedback, and the given speed ω * 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 ** .

[0026] (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 ** Get the DC component through the low-pass filter as the torque given value T ...

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Abstract

The invention discloses a permanent magnet synchronous motor control algorithm of a small-capacity thin-film capacitor transducer system. By precisely controlling motor alternating-axis current, the aberration rate of power grid input current is effectively decreased, the precise control over motor direct-axis current is achieved, and the requirement for speed under the low voltage condition of a DC bus is ensured; by feeding back the voltages of the DC bus, the stability of the whole system is improved. By means of the system, a power factor correcting circuit is omitted, a small-capacity thin-film capacitor is used instead, the whole control system is small in size, cost is reduced, but the control over the rear end is difficult due to the fluctuation of voltages on the capacitor, so a DC component of alternating-axis and direct-axis reference current of a motor is obtained according to the average torque, the alternating-axis and direct-axis reference current is correspondingly adjusted according to the change of bus voltage, an internal model controller or repeated controller or a PR controller is adopted as the current controller, and the alternating-axis and direct-axis reference current of the motor rapidly tracks period demand signals.

Description

technical field [0001] The invention relates to a permanent magnet synchronous motor control algorithm and belongs to the field of motor drive control. Background technique [0002] In the traditional single-phase to three-phase inverter motor drive system, it is mainly composed of rectifier diodes, inductors, electrolyte capacitors and switching tubes. This system is widely used in household appliances, but the efficiency of the entire system is not high, and the current contains A large number of harmonic components cause pollution to the power grid; the inductor as an energy storage element is large in size and high in cost, and the life of the electrolyte capacitor is short, which seriously restricts the life of the entire drive system; the switching loss of the switching tube is large, and the electromagnetic interference problem of the switching tube It is also more serious. [0003] Traditional single-phase to three-phase inverter motor drive systems have many proble...

Claims

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Application Information

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IPC IPC(8): H02P21/00H02P21/22H02P21/20
CPCH02P21/0017
Inventor 林明耀张贝贝杨公德台流臣付兴贺刘凯
Owner SOUTHEAST UNIV
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