A control method of sinusoidal pulse width variable carrier for permanent magnet synchronous motor

A technology of sinusoidal pulse width and permanent magnet synchronous motor, which is applied to the variable carrier control of sinusoidal pulse width of permanent magnet synchronous motor and the variable carrier control field using harmonic injection, which can solve the problems of common mode voltage fluctuation and achieve the suppression of common mode voltage. Fluctuations, the effect of improving utilization

Active Publication Date: 2020-09-25
NORTHWESTERN POLYTECHNICAL UNIV +1
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Problems solved by technology

[0005] In order to avoid the deficiencies of the prior art, the present invention proposes a permanent magnet synchronous motor sinusoidal pulse width variable carrier control method to solve the common mode voltage fluctuation problem of the permanent magnet synchronous motor under the space vector pulse width modulation method

Method used

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  • A control method of sinusoidal pulse width variable carrier for permanent magnet synchronous motor
  • A control method of sinusoidal pulse width variable carrier for permanent magnet synchronous motor
  • A control method of sinusoidal pulse width variable carrier for permanent magnet synchronous motor

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Embodiment Construction

[0026] The present invention will now be further described in conjunction with the embodiments and accompanying drawings:

[0027] The basic idea of ​​the invention is to inject the third harmonic into the sinusoidal pulse width modulation waveform according to the functional characteristics of the space vector pulse width modulation and the sinusoidal pulse width modulation to obtain the same waveform as the space vector pulse width modulation, so as to achieve a high DC voltage utilization effect. Compared with the fixed carrier of space vector pulse width modulation, the control method of carrier phase adjustment is adopted to reduce the common mode voltage fluctuation problem of permanent magnet synchronous motor in space vector pulse width modulation mode.

[0028] The steps of the sinusoidal pulse width variable carrier control method of the permanent magnet synchronous motor are implemented as follows:

[0029] Step 1: Synthesize the comparison value of the three-phase...

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Abstract

The invention relates to a sinusoidal pulse width variable-carrier control method for a permanent magnet synchronous motor. The method comprises combining a sinusoidal pulse width modulation with third harmonic injection by using a mathematical relationship between the third harmonic and the fundamental voltage to improve a DC voltage utilization rate; and adjusting the phase angle of the three-phase carrier according to the intersection of the modulated waves to eliminate a zero vector, thereby suppressing the common-mode voltage fluctuation of the permanent magnet synchronous motor under thecontrol of the variable carrier. The method has the beneficial effects that during the high-speed operation of the permanent magnet synchronous motor, a space vector pulse width modulation method hasa high DC voltage utilization rate, but may aggravate the high-frequency and low-frequency fluctuation of the common-mode voltage of the motor, and the combination of the sinusoidal pulse width modulation, the third harmonic injection and the variable carrier control reduces the fluctuation of the common-mode voltage of the motor under the premise of ensuring the DC voltage utilization rate.

Description

technical field [0001] The invention belongs to a control method of a permanent magnet synchronous motor, and relates to a variable carrier control method of sinusoidal pulse width of a permanent magnet synchronous motor, in particular to a variable carrier control method using harmonic injection. Background technique [0002] Permanent magnet synchronous motor has the advantages of simple structure, high volume energy density and high compactness, and is widely used in AC servo, aerospace and other fields. Space vector pulse width modulation is a commonly used control method for permanent magnet synchronous motors. This method improves the utilization rate of DC voltage while ensuring the high speed control accuracy of the motor. When using space vector pulse width modulation, the motor common mode voltage has obvious fluctuations. [0003] The three-phase voltage source inverter consists of three groups of six switches. The upper and lower switch tubes of the A, B, and C ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/05
Inventor 谭博华志广顾卓斌赵冬冬谢尚威窦满峰
Owner NORTHWESTERN POLYTECHNICAL UNIV
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