Six-phase motor harmonic current suppression method based on model predictive direct torque control

A technology of direct torque control and model prediction, applied in the control of generators, control of electromechanical brakes, control of electromechanical transmissions, etc., can solve the problems of underutilization, complex and time-consuming vector synthesis process, etc. The process is simple and easy to implement, and the effect of improving efficiency

Active Publication Date: 2019-10-15
TAIZHOU UNIV
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Problems solved by technology

However, these methods use vectors of various amplitudes to combine the control process. On the one hand, the vector synthesis process is complex and time-consuming, and on the other hand, they do not make full use of the largest voltage vector

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  • Six-phase motor harmonic current suppression method based on model predictive direct torque control
  • Six-phase motor harmonic current suppression method based on model predictive direct torque control
  • Six-phase motor harmonic current suppression method based on model predictive direct torque control

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Embodiment Construction

[0019] Attached below Figure 1-4 The present invention is carried out the detailed description of specific embodiment:

[0020] Step 1: According to the voltage vector characteristics of the six-phase motor, analyze the vector requirements that meet the harmonic current suppression;

[0021] The six-phase motor drive system corresponding to the neutral point isolation of the present invention is as figure 1 As shown, the vectors of the α, β and x, y subspaces of the system can be expressed as follows:

[0022]

[0023] where a=e jπ / 6 , (S a ,S b ,S c ,S d ,S e ,S f )∈(0,1) is the switching state of the six bridge arms of the inverter, such as S a =0 means the switch tube S of the upper bridge arm a1 cut-off, lower arm switch S a2 conduction, S a =1, the opposite is true, and the other bridge arms are similar. α, β and x, y subspaces each have 2 6 = 64 vectors, divided into 4 magnitudes, the vector space composed of L4, L3, L2, L1 is as follows figure 2 As s...

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Abstract

The invention discloses a six-phase motor harmonic current suppression method based on model predictive direct torque control, which includes the following steps: analyzing the vector requirements ofharmonic current suppression according to the characteristics of a voltage vector of a six-phase motor; making a vector selection table by considering the changes of torque and flux according to the vector selection rules of direct torque; selecting corresponding zero vectors according to the principle of minimum number of switching times, and making a zero vector correspondence table; deriving aprediction model of the motor from a mathematical model of the six-phase motor; and obtaining a simplified cost function according to the characteristics of model predictive direct torque control. Themodel predictive direct torque control method based on the scheme can suppress the harmonic current of the six-phase motor. The implementation process of the scheme is simple and easy, and the maximum voltage vector of the system can be fully utilized.

Description

technical field [0001] The invention relates to the technical field of six-phase motor control, in particular to a six-phase motor harmonic current suppression method based on model prediction direct torque control. Background technique [0002] Multi-phase motors are very suitable for electric vehicles, ship propulsion, wind power, all-electric aircraft and other systems due to their small torque ripple, large control freedom, especially their low-voltage, high-power output, and strong fault tolerance. The double three-phase motor is an asymmetric six-phase motor with two sets of three-phase windings with an electrical angle difference of 30 degrees. In this motor, the α and β subspace voltage vectors for the motor energy conversion will be projected to the x and y harmonic subspaces at the same time. In terms of space, the vector and direct torque control methods of ordinary three-phase motors need to be modified appropriately to be suitable for use in dual three-phase mot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/30H02P27/12
CPCH02P27/12H02P21/30
Inventor 雷必成梅盼林志明邬玲伟陈跃苏娜
Owner TAIZHOU UNIV
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