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Hybrid discontinuous PWM-based instantaneous power decoupling control method for open winding permanent magnet synchronous motor

A technology of permanent magnet synchronous motor and instantaneous power, which is applied in the direction of motor generator control, AC motor control, electronic commutation motor control, etc., and can solve the problems of complex implementation and large amount of calculation

Active Publication Date: 2019-02-15
JIANGSU UNIV
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Problems solved by technology

The vector phase control algorithm needs to use trigonometric functions to calculate the phase of the voltage and current vector, which has the disadvantages of large amount of calculation and complicated implementation

Method used

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  • Hybrid discontinuous PWM-based instantaneous power decoupling control method for open winding permanent magnet synchronous motor
  • Hybrid discontinuous PWM-based instantaneous power decoupling control method for open winding permanent magnet synchronous motor
  • Hybrid discontinuous PWM-based instantaneous power decoupling control method for open winding permanent magnet synchronous motor

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Embodiment Construction

[0057] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0058] Such as figure 1 As shown, the structural schematic diagram of the flying-span capacitor type open-winding permanent magnet synchronous motor system implemented in the present invention includes: a DC power supply, a main inverter, a permanent magnet synchronous motor, a compensation inverter, and a flying-span electrolytic capacitor, a three-phase current sensor, a DC supply voltage sensor, a flying capacitor voltage sensor, a photoelectric encoder and a DSP controller.

[0059] Such as figure 2 As shown, the control block diagram of the flying capacitor type open winding permanent magnet synchronous motor system implemented by the present invention, the control method includes the following steps:

[0060] (1) Use the three-phase current sensor to detect the three-phase stator current i of the permanent ...

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Abstract

The invention discloses a hybrid discontinuous PWM-based instantaneous power decoupling control method for an open winding permanent magnet synchronous motor. According to the method, instantaneous power required by operation of the motor is decoupled into active power and reactive power, and is provided by a main inverter powered by a power supply and a compensation inverter powered by a capacitor in flying capacitor type double inverters; and the main inverter and the compensation inverter are operated in a unit power factor state and a reactive compensation state respectively, so that a trigonometric function and an anti-trigonometric function required to be used in a traditional power distribution algorithm are avoided, the complexity of the control method is reduced, and the running performance of a system of the open winding motor is improved. For a voltage and current phase relation between alternating-current sides of the double inverters, the invention further discloses a hybrid discontinuous PWM modulation strategy, so that the switching loss of the double inverters is greatly reduced, and the efficiency of the driving system of the open winding motor is improved.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to an instantaneous power decoupling control method of an open-winding permanent magnet synchronous motor based on hybrid discontinuous PWM. Background technique [0002] Compared with induction motors, permanent magnet synchronous motors have the advantages of high efficiency, high power factor, high power density and wide speed range, and are widely used in CNC machine tools, electric vehicles, wind power, ship propulsion, aerospace and other fields. Although the permanent magnet synchronous motor has a wide range of speed regulation, as the speed increases, the counter electromotive force gradually increases. In order to maintain the balance between the back EMF and the inverter terminal voltage, a higher inverter DC bus voltage is required. [0003] Using over-modulation technology can improve the utilization rate of DC voltage, but over-modulation will lead t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14H02P27/08H02M7/48
CPCH02M7/48H02P21/14H02P27/08H02M1/0054Y02B70/10
Inventor 许德志赵文祥徐亮陈前
Owner JIANGSU UNIV
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