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Hysteresis current control method based on synchronous rotating coordinate system

A technology of hysteresis current and control method, which is applied in the field of current control of three-phase voltage source inverter, can solve the problems of unfixed switching frequency and poor controllability of switching frequency, achieve high sine degree, reduce the number of switching actions, Effect of Reducing Switching Loss

Active Publication Date: 2021-04-02
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Hysteresis control has been widely used due to its simple implementation, good stability, fast dynamic response, and good robustness. However, its switching frequency is not fixed within a power frequency cycle, and the switching frequency controllability is poor.

Method used

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  • Hysteresis current control method based on synchronous rotating coordinate system
  • Hysteresis current control method based on synchronous rotating coordinate system
  • Hysteresis current control method based on synchronous rotating coordinate system

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.

[0030] like figure 1 As shown, the present invention provides a hysteresis current control method based on a synchronous rotating coordinate system, which can realize direct control of the instantaneous current of the motor. figure 2 It is a permanent magnet synchronous motor (Permanent Magnet SynchronousMotor, PMSM) control block diagram, which is composed of three loops: position loop, speed loop and current loop, using i d = 0 control method, where APR and ASR are position controller and speed controller respectively, θ and θ * are the actual feedback position and the reference position of the rotor, respectively, n and n * are the actual feedback speed of the rotor and the reference speed, respectively, i A i B i C is the three-phase current value output by the in...

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Abstract

The invention provides a hysteresis current control method based on a synchronous rotating coordinate system. Through the hysteresis control based on the voltage vector, the current error is limited to the square that rotates with the coordinate axis, and the coupling relationship between the three phases is considered. When the current error exceeds the hysteresis width, an appropriate voltage vector is selected to make the current error to It runs in the opposite direction, and then limits the current error within the square, and provides a detailed voltage vector selection scheme, so that the output current waveform has a high sine degree. It can reduce the torque ripple, and at the same time reduce the switching times of the inverter and reduce the switching loss.

Description

technical field [0001] The invention belongs to the field of current control of a three-phase voltage source inverter, and in particular relates to a hysteresis current control method under a synchronous rotating coordinate system. Background technique [0002] The current control of the three-phase voltage source inverter is an important part of the overall control structure of applications such as active power filters, AC motor control, and uninterruptible power supplies. The quality of the current controller directly affects the performance of the system. Current control mainly includes predictive control, PI control and hysteresis control. Predictive control is complicated to implement and requires load parameters; PI control parameter adjustment takes a long time and there are many uncertain factors. [0003] Hysteresis control is a control technology based on instantaneous value feedback. The feedback signal is compared with the given signal. If the feedback value is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387H02M7/5395H02P27/08
CPCH02M7/53875H02M7/5395H02P27/08H02M1/0054Y02B70/10
Inventor 解恩任璐于博文薛世阳张智
Owner NORTHWESTERN POLYTECHNICAL UNIV
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