A Field Weakening Control Method for Unity Power Factor of Permanent Magnet Motor Based on Flying Capacitor
A unit power factor, permanent magnet motor technology, applied in the field of permanent magnet motor, flying capacitor open winding field weakening control, can solve the problem of low power factor of permanent magnet motor, to improve control performance and control stability, reduce Effect of reactive pressure and improvement of control performance
Active Publication Date: 2021-05-25
JIANGSU UNIV
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Problems solved by technology
[0005] The invention aims at the problem of low power factor of the permanent magnet motor, uses the power theory to decouple the power flow required by the motor, and all the reactive power is provided by the capacitor bank, so that the motor system operates under the state of unit power factor, thereby obtaining a higher voltage utilization rate
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[0060] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.
[0061] The present invention respectively obtains the dq-axis voltages required for the operation of the motor according to the outer loop control of the speed and the inner loop control of the current; decouples the power required by the motor, proposes a power distribution strategy, and controls the main inverter to provide all the active power required for the operation of the motor At the same time, the capacitor inverter is controlled to compensate the reactive power of the motor; the capacitor bank voltage is sampled and fed back to the capacitor proportional integral controller to calculate the charging voltage reference value. Both the speed outer loop control and the current inner loop control adopt proportional integral controllers.
[0062] Such as figure 1 As show...
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The invention discloses a field weakening control method for unit power factor of a permanent magnet motor based on a flying capacitor. The control method includes the following steps: the speed outer loop controller is composed of a proportional-integral controller to generate a q-axis current reference value; the q-axis inner-loop controller also uses a proportional-integral controller to obtain a motor q-axis voltage reference value; the d-axis The current reference value is obtained from the voltage monitored in real time by the dq axis; as the speed increases, the voltage required for motor operation rises rapidly. Considering that in practical applications, the power supply voltage is difficult to change. To increase the speed, field weakening control is required. The invention enables the power inverter to provide only the active power required for the operation of the motor, and the rest of the reactive power is provided by the capacitor inverter, the motor system operates in the state of unit power factor, and the speed regulation of the motor is extended by using the method of field-weakening control range, expand the constant power area of motor operation, and realize high-performance control of permanent magnet motors.
Description
technical field [0001] The invention relates to the field of permanent magnet motors, in particular to the field of open-winding field-weakening control of flying capacitors, in particular to an open-winding unit power factor field-weakening control, which is conducive to improving the power factor of permanent magnet motors and improving the control performance of the motor. Background technique [0002] With the rapid development of high-tech technologies such as electric vehicles, wind power generation, and wave power generation, how to improve the reliability of the motor system and the efficiency of energy conversion has become a hot issue in these fields. In this technical background, a permanent magnet vernier motor, with its high power density and simple structure, is widely considered to have broad application prospects in direct drive systems. However, the traditional permanent magnet motor has large magnetic flux leakage and low power factor, and often needs to be...
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IPC IPC(8): H02P21/00H02P21/22H02P27/08
CPCH02P21/0089H02P27/085H02P21/22
Inventor 赵文祥宋鑫鑫成瑀
Owner JIANGSU UNIV