Method and device for driving high-speed motor based on pulse width modulation extremum voltage harmonic injection
A pulse width modulation, voltage harmonic technology, applied in the control of electromechanical transmission, generator control, motor generator control, etc., can solve the three-phase voltage vector synthesis direction error, the voltage vector direction deviation, the bus voltage utilization rate is not high. higher question
Inactive Publication Date: 2019-08-06
HARBIN UNIV OF SCI & TECH
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[0009] After the above process, the line-to-line voltage U between any two phases of the motor uv , U vw , U wu None of them exceed the bus line voltage "1", but if Image 6 The restriction on the amplitude of the three-phase voltages shown in the figure results in an error in the synthesis direction of the three-phase voltage vectors. The maximum deviation angle of the voltage vector calculation reaches 2.8°, and the maximum voltage vector amplitude is as follows: Figure 7 As shown, its voltage vector mean value is 0.8561
At this time, the voltage vector direction of the three-phase phase voltage synthesis deviates, and the bus voltage utilization rate is not high
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[0085] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0086] Figure 8 Shown is a schematic diagram of the structure of the motor driving method based on pulse width modulation extreme voltage injection, including:
[0087] The permanent magnet synchronous motor unit 1, the three-phase stator coil of the permanent magnet synchronous motor unit 1 receives the pulse width modulation waveform output by the power modulation unit 10, and drives the rotor to rotate;
[0088] The encoder unit 2 is used to measure the current position of the rotor of the permanent magnet synchronous motor unit 1, and output the mechanical rotation angle θ of the rotor of the permanent magnet synchronous motor unit 1 m ;
[0089] An electrical angle conversion unit 3, used to convert the mechanical angle θ obtained by the encoder unit 2 m Converted to the electrical angle θ used for the calculation of the space vector coordinate transf...
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The embodiment of the invention relates to a method and device for driving a high-speed motor based on pulse width modulation extremum voltage harmonic injection. The high-speed motor generates a highcounter electromotive force in rotation, the maximum speed of a permanent magnet synchronous motor is restricted, the maximum speed of the motor is improved in order to improve the voltage utilization efficiency of the motor in operation, and a pulse width modulation extremum voltage harmonic injection method is proposed. The calculation of a phase voltage harmonic injection value is determined according to a phase voltage extremum relation in the current calculation period of three-phase voltage, and harmonic injection is carried out by adopting a table look-up mode, so that the calculationtime is reduced, and the current response speed is improved. The pulse width modulation mode of equal-proportion three-phase voltage scaling is adopted, and the voltage vector calculation angle deviation caused by the limited phase voltage amplitude of the traditional pulse width modulation is eliminated. According to the invention, the utilization rate of bus voltage is effectively improved, thevoltage vector calculation angle deviation of the traditional pulse width modulation method is effectively restrained, and the current control accuracy of the motor in high-speed rotation is improved.
Description
technical field [0001] The invention is mainly aimed at the control process of a permanent magnet synchronous motor, and is a harmonic injection method for improving the bus voltage utilization rate of a control system. The method can effectively solve the problem of low bus voltage utilization rate during high-speed rotation of a high-speed motor. Background technique [0002] figure 1 It is the modulation process of the pulse width modulation wave (only U and V two phases are drawn), and the counter is compared with the command sine to fit the pulse width modulation waveform. Let the bus voltage be V dc , when the upper bridge arm of the power switch tube is turned on in forward saturation, the equivalent phase voltage at this time is +V dc / 2, when the lower bridge arm of the power switch tube is turned on in reverse saturation, the equivalent phase voltage is -V dc / 2. When the upper bridge arm of the U-phase power switch tube is 100% open, and the V-phase lower brid...
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Login to View More IPC IPC(8): H02P21/00H02P25/022
CPCH02P21/0003H02P25/022H02P2207/05
Inventor 王磊任齐民张洪鑫
Owner HARBIN UNIV OF SCI & TECH