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Permanent magnet synchronous motor low inverter power consumption direct torque control method and device

A permanent magnet synchronous motor and direct torque control technology, which is used in motor generator control, control of electromechanical transmission, electronic commutation motor control, etc., can solve problems such as complex algorithms and inability to apply in real time

Inactive Publication Date: 2014-04-16
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Foreign research in this area has achieved certain results, but there are still problems related to the complexity of the algorithm, which cannot be applied in real time, and the online calculation time increases exponentially with the increase of the prediction time domain.

Method used

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  • Permanent magnet synchronous motor low inverter power consumption direct torque control method and device
  • Permanent magnet synchronous motor low inverter power consumption direct torque control method and device
  • Permanent magnet synchronous motor low inverter power consumption direct torque control method and device

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Experimental program
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Effect test

specific Embodiment approach

[0065] 1 Set K in the speed closed-loop control p =0.08, K i =0.8;

[0066] 2Set the reference speed ω * =900r / min;

[0067] 3 Set the reference flux linkage amplitude

[0068] 4 Sampling the motor phase current i in the inverter circuit through voltage and current sensors a i b i c and bus voltage U dc Calculate the observed value of the stator flux linkage at the current moment:

[0069] (4.1) First convert the current and voltage from the three-phase abc coordinate system to the two-phase d, q coordinate system

[0070] i d i q = 2 3 cos ( θ r ) ...

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Abstract

The invention relates to a permanent magnet synchronous motor low inverter power consumption direct torque control method and device. The permanent magnet synchronous motor low inverter power consumption direct torque control method adopts predictive control strategies. Compared with the space-vector-modulation-based direct torque control and the common direct torque control, the permanent magnet synchronous motor low inverter power consumption direct torque control method has the advantages of enabling the integral inverter switching frequency to be the lowest, optimally using a power device and reducing the switching loss of the inverter due to the facts that predicted values of the torque and the stator flux linkage are predicated according to an interior model of a controller based on the given reference values of the torque and the stator flux linkage and a most suitable switching position for the inverter is obtained through a minimization objective function which comprises the flux linkage, the torque and the average switching frequency within the forecast time domain and enabling online computing time to be greatly reduced due to the fact that the control law is fed back through an offline computing state, maintaining good dynamic performance and robustness of the common direct torque control and maintaining the flux and the torque to be within a corresponding hysteresis range.

Description

technical field [0001] The invention relates to a control method for an optimized direct torque system of a permanent magnet synchronous motor, belonging to the technical field of frequency conversion and speed regulation control of a direct drive system of a permanent magnet synchronous AC motor. Background technique [0002] With the rapid development of semiconductor power switching devices, induction motor speed control drive system has been widely used. Since the development trend of modern electrification is to save energy and improve energy utilization efficiency, permanent magnet synchronous motors are gradually replacing induction motors and getting more and more applications due to their advantages of high efficiency, high power factor and high power density. In these applications, the DC-AC inverter is used as a three-phase voltage source or current source for the motor, and the motor is driven by changing the frequency of the voltage or current output by the inve...

Claims

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Application Information

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IPC IPC(8): H02P21/14
CPCY02P80/10
Inventor 刘景林陈俊硕
Owner NORTHWESTERN POLYTECHNICAL UNIV
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