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Model-free predictive current control method and control system based on three voltage vectors

A technology for predicting current and control methods, applied in vector control systems, control systems, motor generator control, etc. Wave current increases and other problems, to reduce fluctuations and steady-state errors, improve tracking accuracy

Pending Publication Date: 2022-07-19
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the traditional model-free predictive current control, since only one voltage vector is applied to the inverter in each control cycle, the steady-state error and ripple current of the current increase, which in turn affects the stability of the system output torque and the control performance of permanent magnet synchronous motor control system

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  • Model-free predictive current control method and control system based on three voltage vectors
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  • Model-free predictive current control method and control system based on three voltage vectors

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Embodiment 1

[0023] figure 1 A three-voltage vector-based model-free predictive current control method provided in Embodiment 1 of the present invention includes the following steps: establishing a current prediction model based on a super-local model; the method further includes the following steps:

[0024] s1. Estimate the expected voltage output in the next cycle based on the current prediction model of the hyperlocal model;

[0025] s2. Select the sector corresponding to the phase angle of the desired vector;

[0026] s3. Calculate the current slope according to the currents corresponding to the three vector voltages included in the sector;

[0027] s4. Calculate the optimal action time of the three voltage vectors according to the Hessian matrix of the cost function, thereby synthesizing the optimal voltage vector.

[0028] The above scheme is based on the super-local model to avoid the dependence of the system on the motor parameters. At the same time, in order to optimize the pha...

Embodiment 2

[0035] figure 2 A permanent magnet synchronous motor control system based on three-voltage vector model-free predictive current control provided in the second embodiment of the present invention is shown. a speed loop controller for an angle value, a model-free predictive current control module for receiving the reference current output from the speed loop controller, a space vector pulse width modulation module for receiving the optimal action time output by the model-free predictive current control module, receiving The three-phase inverter of the optimal voltage vector output by the space vector pulse width modulation module, the encoder receiving the three-phase AC voltage output by the three-phase inverter, and the position and angle connected to the encoder a detection module; the position and angle detection module forms a closed loop by returning the detected angle to the angle input module;

[0036] A Clark transformation module and a Park transformation module are ...

Embodiment 3

[0041] In the specific implementation, the PMSM model based on the hyperlocal model is established first.

[0042] The expression of the first-order hyperlocal model of a single-input single-output system is as follows:

[0043]

[0044] Among them, Y(t) is the output of the system at time t; U(t) is the input of the system at time t; α is the designable scale factor of the hyperlocal model; F(t) is the parameter set value of the system at time t. Based on the above hyperlocal model, the PMSM model can be expressed as:

[0045]

[0046] Among them, F d is the parameter set value of the d-axis; F q is the parameter set value of the q-axis;

[0047]

[0048] where i d and i q are the current values ​​of the d and q axes, respectively; u d and u q are the input voltage values ​​of the d and q axes, respectively; R s is the resistance of the permanent magnet synchronous motor; L s is the inductance of the permanent magnet synchronous motor; ω r is the electrical...

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Abstract

The invention is suitable for the technical field of permanent magnet synchronous motor control, and provides a model-free predictive current control method and system based on three voltage vectors. According to the method, the model-free predictive current control of the permanent magnet synchronous motor is realized by introducing the hyper-local model into the current predictive model, and the voltage vector applied to the inverter is optimized by selecting three voltage vectors and calculating the optimal action time of the three voltage vectors. The current fluctuation and steady-state error are reduced and the tracking precision of the current loop is improved while the current loop controller is ensured to get rid of parameter dependence.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet synchronous motor control, and in particular relates to a three-voltage vector-based model-free predictive current control method and control system. Background technique [0002] In the prior art model-free predictive current control, the future current is predicted according to the current variation corresponding to the eight voltage vectors of the inverter, so as to get rid of the dependence on parameters and improve the robustness of the current loop controller. However, in the traditional model-free predictive current control, since only one voltage vector is applied to the inverter in each control cycle, the steady-state error and ripple current of the current increase, which in turn affects the stability of the system output torque. and the control performance of the permanent magnet synchronous motor control system. There are deficiencies in the existing technology. SUMMARY OF ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/22H02P21/14H02P25/022H02P27/12H02M7/5387
CPCH02P21/22H02P21/14H02P25/022H02P27/12H02M7/53875H02P2207/05
Inventor 邓永停孙征王建立李洪文
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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