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Current harmonic suppression method for electric motor

A technology of current harmonics and sub-harmonics, which is applied in the field of current harmonic suppression of motors, can solve the problem of reducing the effect of harmonic suppression, achieve good harmonic elimination, and improve performance

Active Publication Date: 2015-09-23
SHANGHAI STEP ELECTRIC +1
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Problems solved by technology

[0003] Taking a three-phase asynchronous motor as an example, the current contains harmonics such as 5th, 7th, 11th, 13th, and 17th. When the harmonic frequency is low, the current loop controller can better suppress the harmonic current. However, when the frequency increases, due to the limitation of the bandwidth of the current loop controller, the effect on harmonic suppression is reduced

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  • Current harmonic suppression method for electric motor
  • Current harmonic suppression method for electric motor
  • Current harmonic suppression method for electric motor

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Embodiment Construction

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] The invention is realized on the basis of motor vector control. The control block diagram of the existing vector control is as follows: figure 1 shown. figure 1 in, ω * and ω are given speed and feedback speed respectively, i d * i d Respectively for the d-axis given current and feedback current, i q * i q Respectively for the q-axis given current and feedback current, i a i b are the phase currents of phase A and phase B of the motor, i α i β is the current component in the stationary two-phase coordinate system, u d , u q Respectively d-axis voltage and q-axis voltage, u α , u β is the voltage component in the stationary two-phase coordinate system, ω e For the synchronous angular velocity of the motor, both the speed controller and the current loop controller are PI regulators.

[0023] After converting the current ...

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Abstract

The invention discloses a current harmonic suppression method for an electric motor. The current harmonic suppression method comprises the following steps of: estimating a harmonic current i<dhe>of i<d> and a harmonic current i<qhe> of i<q> according to a received signal i<dh> obtained by calculating the difference between a d-axis given current i<d><*> and a d-axis feedback current i<d> and a received signal i<qh> obtained by calculating the difference between a q-axis given current i<q><*> and a q-axis feedback current i<q>; calculating a d-axis compensation voltage u<dco> and a q-axis compensation voltage u<qco> according to the estimated harmonic currents i<dhe> and i<qhe>; and respectively adding the d-axis compensation voltage u<dco> and the q-axis compensation voltage u<qco> into a d-axis voltage u<d> output from a d-axis current loop controller and a q-axis voltage u<q> output from a q-axis current loop controller. After adopting the above technical scheme, current harmonics of the electric motor can be effectively eliminated during vector control of the electric motor.

Description

technical field [0001] The invention relates to a current harmonic suppression method of a motor. Background technique [0002] Due to the structure of the motor such as the cogging effect, the back electromotive force of the motor is not in an ideal shape, which will cause the current of the motor to not be a sine wave, but contain harmonics. Harmonic currents cause torque ripple, which degrades motor performance. Suppression of current harmonics can improve the performance of the motor. [0003] Taking a three-phase asynchronous motor as an example, the current contains harmonics such as 5th, 7th, 11th, 13th, and 17th. When the harmonic frequency is low, the current loop controller can better suppress the harmonic current. However, when the frequency increases, the effect on harmonic suppression is reduced due to the limitation of the bandwidth of the current loop controller. To suppress harmonics, the harmonic currents can be individually controlled. Vector control ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14
Inventor 李柏松陈伟金辛海蔡亮
Owner SHANGHAI STEP ELECTRIC
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