Method for optimizing DTC system of six-phase asynchronous motor

An asynchronous motor and optimization method technology, applied in the control system, AC motor control, electrical components and other directions, can solve the problems of large motor torque ripple and stator harmonic current, affecting motor speed regulation performance, shortening motor life, etc. Small torque ripple, stable speed, and the effect of avoiding torque overshoot

Inactive Publication Date: 2014-08-06
CHINA UNIV OF MINING & TECH
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Problems solved by technology

However, the DTC system has the problem of large motor torque ripple and stator harmonic current. The large torque ripple of the motor will affect the speed regulation performance of

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  • Method for optimizing DTC system of six-phase asynchronous motor
  • Method for optimizing DTC system of six-phase asynchronous motor
  • Method for optimizing DTC system of six-phase asynchronous motor

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Embodiment Construction

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0034] Such as figure 2 As shown, a structural block diagram of an optimization method for a six-phase asynchronous motor DTC system, the control system includes: an intermediate voltage vector selection unit, a basic voltage vector action time calculation unit, a speed regulator, a torque observer, and a flux linkage observer , Torque hysteresis comparator, flux linkage hysteresis comparator, voltage 6s / 2s unit, current 6s / 2s unit, sector judgment unit, space vec...

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Abstract

The invention relates to a method for optimizing a DTC system of a six-phase asynchronous motor. The DTC system comprises an intermediate voltage vector selection unit, a fundamental voltage vector action time calculation unit, a speed regulator, a torque observer, a flux linkage observer, a torque hysteresis comparator, a flux linkage hysteresis comparator, a voltage 6s/2s unit, a current 6s/2s unit, a sector judgment unit, a space vector modulation generator and a speed measurement encoder. Compared with a traditional DTC system, intermediate voltage vectors serve as selected voltage vectors, zero vectors are evenly distributed in each switching period, and therefore current harmonics of a motor stator are improved and vector selection is simplified; the action time duty ratio of the intermediate voltage vectors in the next switching period is worked out through torque difference value variables in the current period and the moments when fundamental voltage vectors start to act are further worked out to compensate for a torque difference value, the torque ripple of the motor is reduced, and the switching frequency is kept constant.

Description

technical field [0001] The invention relates to the field of asynchronous motor control, in particular to an optimization method for a DTC system of a six-phase asynchronous motor. Background technique [0002] In recent years, in ship propulsion and other occasions that require low voltage, high current, and high reliability transmission, the application of multi-phase motor speed control systems has become increasingly widespread. Compared with the three-phase system, the multi-phase system has high reliability, can operate without phase, has small torque ripple, good dynamic and static characteristics of the system, and can realize low voltage and high power. Therefore, the six-phase asynchronous motor speed control system, as a typical multi-phase speed control system, has broad application prospects. Direct torque control (DTC) technology is another high-performance AC motor speed control method developed after vector control. DTC technology avoids complex decoupling ...

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Application Information

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IPC IPC(8): H02P23/00H02P23/12
Inventor 耿乙文鲍宇周勤奋施向前李小强王凯段然张翀胡骢张雪吴琼李珊珊李周生郑飞
Owner CHINA UNIV OF MINING & TECH
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