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Optimal model predictive control method for double-inverter open winding induction motor

A technology of induction motor and double inverter, which is applied in motor-generator control, AC motor control, electronic commutation motor control, etc., can solve the difficulty in setting the value function weight factor, the complex setting of the internal current loop, and the output torque of the motor. The problem of large ripple, etc., can eliminate the problem of weight factor setting, reduce the calculation burden, and achieve the effect of simple algorithm.

Inactive Publication Date: 2019-07-09
HUAIHAI INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-performance AC speed control methods include field oriented control (FieldOrientedControl, FOC) and direct torque control (DirectTorqueControl, DTC). In FOC, good torque and flux linkage control of the motor can be achieved, but the internal current loop requires complex tuning , the control structure in DTC is simple to achieve fast dynamic response, but the output torque ripple is large
[0003] Model predictive control (Model Predictive Control, MPC), as a control strategy emerging in recent years, has the advantages of simple structure, fast dynamic response, and good control effect; currently, MPC is applied to high-performance closed-loop control of asynchronous motors, and good control effects are obtained. However, it is difficult to adjust the weight factor in the value function, which is not conducive to practical application; in order to solve this problem, a predictive current control is proposed, although the adjustment process of the weight factor is omitted, the output torque ripple of the motor is relatively large; and A non-weight factor MPC applied to permanent magnet synchronous generators is proposed. This method can solve the problem of weight factor tuning, but the calculation process is complicated and not applicable to OEWIM; a method based on multi-objective sorting analysis is also proposed to eliminate The purpose of the weighting factor, however, this method makes the forecasting process more complicated due to the complex mathematical derivation involved

Method used

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Embodiment 1

[0036] An optimized model predictive control method for a double-inverter open-winding induction motor, comprising the following steps:

[0037] By discretizing the OEWIM mathematical model, the predicted values ​​of flux linkage and current can be obtained as follows:

[0038] ψ s (k+1)=ψ s (k)+T s [V s (k)|R s i s (k)] (1)

[0039]

[0040] According to the predicted values ​​of flux linkage and current, the predicted electromagnetic torque is obtained, specifically:

[0041]

[0042] in

[0043]

[0044] In order to control the stator flux amplitude and electromagnetic torque at the same time, the value function can be constructed as follows, where λ is the weight factor of the flux amplitude:

[0045]

[0046] The value function consists of two parts, the first part is used to evaluate the torque error, and the second part is used to evaluate the flux linkage error, where λ represents the weight factor of the stator flux linkage respectively.

[0047] ...

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Abstract

The invention belongs to the technical field of double-inverter open winding induction motors, in particular to an optimal model predictive control method for a double-inverter open winding inductionmotor. The optimal model predictive control method comprises the following steps: (1) constructing a weightless factor value function; (2) studying and establishing a virtual ideal vector FCS-MPC; (3)and introducing a loss factor to construct a low switching frequency control strategy. The problem of high switching loss of OEWIM in high power applications can be analyzed and solved.

Description

technical field [0001] The invention belongs to the technical field of double-inverter open-winding induction motors, and in particular relates to an optimization model predictive control method for double-inverter open-winding induction motors. Background technique [0002] Double-inverter-fed open-winding asynchronous motor (OpenEndWindingInductionMotor, OEWIM) has been rapidly promoted and applied in high-power applications in recent years due to its high fault tolerance and ability to provide more levels. High-performance AC speed control methods include field-oriented control (FieldOrientedControl, FOC) and direct torque control (DirectTorqueControl, DTC). In FOC, good torque and flux linkage control of the motor can be achieved, but the internal current loop requires complex tuning , the simple control structure in DTC can achieve fast dynamic response, but the output torque ripple is large. [0003] Model predictive control (Model Predictive Control, MPC), as a contr...

Claims

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Application Information

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IPC IPC(8): H02P21/00H02P21/28H02P27/12
CPCH02P21/0003H02P27/12H02P21/28
Inventor 吴迪陈继峰胡家全朱芮华国武
Owner HUAIHAI INST OF TECH
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