Permanent magnet synchronous motor model predictive torque control method considering switching frequency optimization

A permanent magnet synchronous motor, switching frequency technology, applied in the direction of motor generator control, AC motor control, electronic commutation motor control, etc., can solve problems such as unconsidered impact and unconsidered IPMSM salient pole effect

Active Publication Date: 2018-08-24
江苏富浩电子科技有限公司
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Problems solved by technology

However, this patent does not consider the influence of the inverter switching loss on the performance of the motor when the IPMSM is running at full speed, nor does it consider the salient pole effect of the IPMSM

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  • Permanent magnet synchronous motor model predictive torque control method considering switching frequency optimization
  • Permanent magnet synchronous motor model predictive torque control method considering switching frequency optimization
  • Permanent magnet synchronous motor model predictive torque control method considering switching frequency optimization

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Embodiment Construction

[0038] The present invention will be further explained below in conjunction with the accompanying drawings.

[0039] The schematic diagram of a model predictive torque control method for permanent magnet synchronous motors considering switching frequency optimization is shown in Fig. figure 1 As shown, it includes a rotational speed PI controller 1 , a model predictive control module 2 , a full-speed domain value function module 3 , an inverter 4 , a coordinate transformation module 5 , a permanent magnet synchronous motor 6 and an encoder 7 .

[0040] Firstly, the speed increment obtained through speed negative feedback passes through the speed PI controller to obtain a given torque T e ref ; Then get the electrical angle θ of the IPMSM from the encoder r and electrical angular velocity ω r , and obtain the three-phase stator current i at time k a , i b and i c , after Clark transformation and Park transformation, the d-q component i of the stator current at time k is o...

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Abstract

The invention discloses a permanent magnet synchronous motor model predictive torque control method considering switching frequency optimization. The method comprises a step of obtaining a given torque Teref after a speed increment obtained by rotation speed negative feedback passes a PI controller, a step of obtaining an electrical angle Theta r and an electrical angular velocity omega r of a permanent magnet synchronous motor from an encoder, obtaining three-phase stator currents ia, ib and ic at a time k, and obtaining d-q components id and iq of stator current at a time k through Clark transform and Park transformation, a step of predicting d-q component idk+1 and iqk+1 of the stator currents at a time (k+1) and an electromagnetic torque Tek+1 in an online way by using a prediction model, and constructing a full-speed domain value function with the combination of multiple control targets, and a step of obtaining an optimal voltage vector of an inverter through minimizing the full-speed domain value function. According to the method, the salient pole effect of the permanent magnet synchronous motor is considered, the switching frequency of the inverter can be effectively reduced, at the same time, the method has good dynamic response performance and can be applied in a constant torque region and a constant power region.

Description

technical field [0001] The invention relates to a model predictive torque control method of a permanent magnet synchronous motor in consideration of switching frequency optimization, which belongs to the field of motor drive and control. Background technique [0002] The interior permanent magnet synchronous motor (IPMSM) has the advantages of high power density, small size, and good speed regulation performance, and has been widely used in new energy fields such as electric vehicles in recent years. Traditional high-performance permanent magnet synchronous motor speed control methods mainly include vector control (Vector control, VC) and direct torque control (Direct torque control, DTC). The main idea of ​​the VC scheme is to decompose the stator current into d-q axis currents to control the rotor flux linkage and electromagnetic torque respectively. The DTC scheme uses the torque of the IPMSM as the control target, which has the advantages of simple structure, fast torqu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/34H02P21/20H02P21/26H02P21/22H02P25/024H02P27/06
CPCH02P6/34H02P21/20H02P21/22H02P21/26H02P25/024H02P27/06
Inventor 於锋田朱杰吴晓新刘兴
Owner 江苏富浩电子科技有限公司
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