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 inverters, can solve problems such as poor controllability of switching frequency and unfixed switching frequency, and achieve reduced switching times, high sine degree, Effect of Reducing Torque Ripple

Active Publication Date: 2019-07-09
NORTHWESTERN POLYTECHNICAL UNIV
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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.

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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] Such as 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...

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Abstract

The invention provides a hysteresis current control method based on a synchronous rotating coordinate system. The current error is limited to a square rotating with the coordinate axis through hysteresis control based on a voltage vector, and the coupling relationship of the three phases is considered. When the current error exceeds the hysteresis width, an appropriate voltage vector is selected to make the current error run in the opposite direction, and thus, the current error is limited to the square. A detailed voltage vector selection scheme is proposed to make the output current waveformhighly sinusoidal. The torque ripple can be reduced. Moreover, the number of switching operations of the inverter can be reduced, and the switching loss can be reduced.

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 Applications(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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