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Dead-beat torque control device, method and system

A torque control and deadbeat technology, applied in the field of deadbeat torque control devices, can solve problems such as system instability and current oscillation

Active Publication Date: 2020-01-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The literature "Permanent Magnet Synchronous Motor Deadbeat Current Predictive Control" is based on motor vector control, and the current PI controller is changed to a current deadbeat controller, which improves the rapidity of control, but the nominal inductance of the controller exceeds the actual inductance When doubled, the system will be unstable, resulting in current oscillations

Method used

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  • Dead-beat torque control device, method and system
  • Dead-beat torque control device, method and system

Examples

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Effect test

no. 1 approach

[0052] According to the first embodiment of the present invention, a deadbeat torque control method is provided. figure 1 A schematic flowchart of the deadbeat torque control method is shown. like figure 1 As shown, the method includes the following steps:

[0053] S110, Reference torque Stator voltage μ sα, mu sβ , stator current i sα, i sβ , stator resistance R s , discrete period T s , stator and rotor self-inductance and stator-rotor mutual inductance L s , L r , L m , the number of motor pole pairs p;

[0054] S120, calculating stator flux linkage and rotor flux linkage,

[0055] Among them, the stator flux linkage is calculated according to the following formula: Ψ s = L s i s +L m i r ,

[0056] The rotor flux linkage is calculated according to the following formula: Ψ r = L r i r +L m i s .

[0057] S130, decompose the stator flux linkage in the two-phase stationary coordinate system, and obtain ψ sα and ψ sβ , calculate the torque of the ind...

no. 2 approach

[0085] Due to the calculation delay and one-beat lag of the control cycle in the digital control system, the reference voltage vector calculated at time k acts at time k+1, and reaches the given torque and given flux linkage at time k+2. In order to eliminate the one-beat lag of the digital control system, it is considered to add delay compensation to the dead-beat direct torque controller to predict the two-time electromagnetic torque and stator flux linkage. The calculation process and calculation results in the case of predicting the electromagnetic torque and stator flux linkage twice are described below.

[0086] According to equations (3) and (11), the electromagnetic torque and stator flux linkage at time k+2 can be predicted

[0087]

[0088]

[0089] Due to the reference voltage vector calculated at time k, the given torque and given flux linkage can only be reached at time k+2, that is

[0090]

[0091]

[0092] From equations (3) and (14), the torque an...

no. 3 approach

[0101] According to the third embodiment of the present invention, a deadbeat torque control device is also provided. image 3 A schematic block diagram of the device is shown. like image 3 As shown, the device includes:

[0102] The receiving component 310 is used to receive the reference torque Stator voltage μ sα, mu sβ , stator current i sα, i sβ , stator resistance R s , discrete period T s , stator and rotor self-inductance and stator-rotor mutual inductance L s , L r , Lm, the number of motor pole pairs p;

[0103] The torque calculation component 320 is used to calculate the stator flux linkage and the rotor flux linkage according to the following formula: Ψs=Lsi s +L m i r Ψ r = L r i r +L m i s ; Decompose the stator flux linkage in the two-phase stationary coordinate system to get ψ sα and ψ sβ , calculate the torque of the induction motor at time k according to the following formula:

[0104] T e (k)=p[ψ sα (k)i sβ (k)-ψ sβ (k)i sα (k)] ...

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Abstract

The invention discloses a dead-beat torque control device, method and system. The dead-beat torque control method comprises the steps of receiving reference torque T*e, stator voltages [mu]<s[alpha]>and [mu]<s[beta]>, stator currents i<s[alpha]> and i<s[beta]>, stator resistance Rs, a discrete period Ts, stator self-inductance, rotor self-inductance and stator and rotor mutual inductance Ls, Lr and Lm, and a motor pole pair number p; calculating a stator flux linkage and a rotor flux linkage; calculating the torque of an induction motor at the moment k; calculating a torque angle of the induction motor at the moment k; calculating a torque angle increment; discretizing the stator flux linkage to obtain a stator flux linkage at the moment k and a reference stator flux linkage at the momentk; and calculating the stator voltage at the moment (k+1). According to the technical scheme, dead-beat control replaces a hysteresis comparator for direct torque control, and delay compensation is added, so that accurate tracking of the torque is achieved, the torque pulsation is reduced, and the switching frequency is fixed.

Description

technical field [0001] The invention relates to direct torque control of space voltage vector pulse width modulation, in particular to a deadbeat torque control device, method and system. Background technique [0002] The three-level inverter is a topological structure with low harmonic content and low switching loss. Compared with the two-level inverter, the switching devices have lower voltage stress and are widely used in high-voltage and high-power fields. As a fault-tolerant structure of three-level topology, three-phase eight-switch has fewer devices and is easier to operate than the four-arm redundant structure. However, the three-phase eight-switch topology has the problem of uneven voltage division of the supporting capacitors on the DC side, that is, the shift of the midpoint potential will increase the harmonic content of the voltage, increase the voltage on both ends of the power tube, and affect the normal operation of the load. In response to the above problem...

Claims

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Application Information

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IPC IPC(8): H02P21/05H02P27/12H02P21/30
CPCH02P21/05H02P27/12H02P21/30
Inventor 向超群成庶李卓鑫张璐琳陈春阳
Owner CENT SOUTH UNIV
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