A Switching Method of Circular and Hexagonal Direct Torque Control
A direct torque control, hexagonal technology, applied in the control system, control generator, vector control system, etc., can solve the problems of large torque ripple, switching failure, incomplete judgment of switching conditions, etc., to reduce the ripple , to ensure smooth switching, the effect of small impact
Inactive Publication Date: 2017-12-12
CENT SOUTH UNIV +1
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However, the judgment of the existing switching conditions is not comprehensive, and it cannot be guaranteed that the switching can be successful in all cases, that is, the switching failure may occur, and there will still be large torque ripples during the switching process.
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[0052] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
[0053] refer to figure 1 As shown, it is a flow chart of the switching method of circular and hexagonal direct torque control provided by the present invention. The switching method of the circular and hexagonal direct torque control includes:
[0054] Compare the current speed of the motor with the set switching speed to judge whether the speed meets the switching conditions; if not, return to the initial state to re-judgment, and if it is satisfied, continue to judge;
[0055] Calculate the flux linkage amplitude and flux linkage phase angle through the three-phase voltage amplitude and current amplitude of the motor stator; divide the flux linkage sector by the flux linkage phase angle, and judge the flux linkage amplit...
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The invention discloses a switching method of circular and hexagonal direct torque control, which comprises: comparing the current rotating speed of the motor with the switching rotating speed to judge whether the rotating speed satisfies the switching condition; value, calculate the flux linkage amplitude and flux linkage phase angle; divide the flux linkage sector by the flux linkage phase angle, and judge whether the flux linkage amplitude and the flux linkage phase angle meet the switching conditions; The sector distribution and the current switching signal determine whether the voltage vector meets the switching conditions; if both meet the switching conditions, the circular flux linkage control and the hexagonal flux linkage control are switched. The switching method of circular and hexagonal direct torque control can not only effectively ensure the smooth switching between circular flux linkage control and hexagonal flux linkage control, but also reduce the pulsation of speed and torque, and at the same time affect the stator current The impact of the waveform is minimal, and it will not impose an additional burden on the device's withstand voltage and co-current capability.
Description
technical field [0001] The invention relates to the technical field of motor control, in particular to a switching method for circular and hexagonal direct torque control. Background technique [0002] Direct torque control is a new motor control scheme proposed by Professor Depenbrock of Ruhr University in Germany in 1985. Direct torque control has the advantages of simple structure, fast torque response and strong robustness. At present, direct torque control can be divided into hexagonal flux control and circular flux control according to the flux trajectory. The hexagonal flux linkage control is characterized by changing the switching state 6 times in one control cycle. In high-power traction, it can effectively reduce the switching loss. Therefore, the stator flux linkage model can meet the requirements of the hexagonal flux linkage control at high speed. control needs. Circular flux linkage control is characterized by a large number of output voltage vectors in one c...
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IPC IPC(8): H02P21/30H02P21/05
Inventor 成庶向超群毛炳奎于天剑陈雅婷韩丁王晗蒋济雄
Owner CENT SOUTH UNIV