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Three-phase alternating current motor current harmonic suppression method

A motor current and three-phase AC technology, which is applied in motor control, motor generator control, electromechanical brake control, etc., can solve problems such as the inability to achieve effective control of the current AC component, and achieve a good suppression effect of each harmonic and a large amount of calculation The effect of small size and simple algorithm structure

Inactive Publication Date: 2019-04-16
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the traditional vector control current control scheme, the d-q axis current regulator is mainly used to realize the control of the DC component of the current, and cannot effectively control the AC component of the current, and proposes a three-phase AC Current Harmonic Suppression Method of Permanent Magnet Motor

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  • Three-phase alternating current motor current harmonic suppression method

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0033] In the following embodiments, the AC motor is an example of a permanent magnet motor, and the inverter is an example of a two-level voltage type inverter.

[0034] figure 1 It is a schematic circuit structure diagram of a permanent magnet motor speed control system, and the control system includes a DC bus voltage source, a current sampling circuit, a three-phase inverter, a DSP controller and a power drive module. The invention respectively collects the DC side bus voltage and the phase current of the permanent magnet motor through the current and voltage Hall sensors, and then inputs the voltage sampling signal and the current sampling signal into a DSP controller through a hardware conditioning circuit and converts them into digital signals. The controller generates the driving control signal of the power module of the permanent magn...

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Abstract

A three-phase alternating current motor current harmonic suppression method extracts the sum of harmonic components of a three-phase current of a motor through a low-pass filter, and then obtains a harmonic voltage component value to be injected through a harmonic component adjuster, and then superimposes a harmonic voltage component value on an output voltage control signal of a d, q-axis currentclosed-loop controller to obtain the target reference voltage. A control signal of a power driving module is obtained by the space vector pulse width modulation technology. The method can realize thedecoupling and independent control of a d, q-axis current direct current component and a current full order harmonic component of the current, and effectively reduce the current harmonic content of each order.

Description

technical field [0001] The invention relates to a method for controlling a three-phase AC motor. Background technique [0002] With the modern industry's higher and higher requirements for motor control performance, field oriented control is widely used in the high-performance control of AC motors. The field oriented control is realized through the direction of the rotor magnetic field, so that the stator current can be decomposed into the excitation component and the torque component in the synchronous rotating coordinate system, and then the target voltage reference value is obtained through the proportional integral regulator, and finally the space vector pulse width is used Modulation (SVPWM) technology to obtain the control signal of the power drive module, so as to realize the high-performance control of the AC motor. Due to the existence of factors such as the distortion of the air gap magnetic field of the AC motor and the nonlinearity of the inverter, the three-pha...

Claims

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Application Information

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IPC IPC(8): H02P29/50H02P21/22
CPCH02P21/22H02P29/50
Inventor 张剑夏波温旭辉
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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