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Control Method of Parallel Control Structure Between Linear Controller and Model Predictive Controller

A technology of linear controller and control structure, applied in the direction of control/regulation system, instrument, output power conversion device, etc., can solve the problems of extra design speed, difficult to determine the switching point of the controller, complicated control process, etc., and achieve fast dynamic The effect of response speed

Active Publication Date: 2020-02-21
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a control method for a parallel control structure of a linear controller and a model predictive controller, thereby solving the existing method or switching the control of the linear controller and the model predictive controller, so that The control process is complicated and oscillation may occur, and the switching point of the controller is difficult to determine; or the linear controller and the model predictive controller are used as the outer loop and the inner loop control respectively, so it is necessary to additionally design the technical problem of the outer loop of the linear controller with limited speed

Method used

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  • Control Method of Parallel Control Structure Between Linear Controller and Model Predictive Controller
  • Control Method of Parallel Control Structure Between Linear Controller and Model Predictive Controller
  • Control Method of Parallel Control Structure Between Linear Controller and Model Predictive Controller

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Embodiment 1

[0062] Embodiment 1: Taking a three-phase grid-connected inverter as an example, and referring to the accompanying drawings, the implementation process of the present invention will be described in detail.

[0063] The topology of the three-phase grid-connected inverter is as follows: Figure 5 As shown, it consists of a DC bus voltage source, a three-phase inverter, a grid-connected filter, and a three-phase grid, among which V dc is the DC bus voltage, S 1 ~S 6 is the power electronic switching device, v ga , v gb , v gc are the three-phase voltages output by the inverter respectively, i ga i gb i gc Respectively three-phase grid-connected current, L g is the grid-connected filter inductance, R g is the leakage resistance of the grid-connected filter and the equivalent resistance of the switching tube loss, u ga , u gb , u gc are the voltages of the three-phase grid, respectively. In order to explain the technical solution of the present invention concisely and ...

Embodiment 2

[0127] Embodiment 2: Taking the Buck circuit as an example and referring to the accompanying drawings, the implementation process of the present invention will be described in detail.

[0128] The topology of the Buck circuit is as follows Figure 7 As shown, let the input voltage be V s , the switch tube is G, the freewheeling diode is D, and the voltage across the diode is V in , the filter inductance is L, and the current through L is i L , the filter capacitor is C, the output voltage is V o . In order to briefly explain the technical solution of the present invention, it is assumed that the Buck circuit always works in the continuous state of the inductor current, and the above-mentioned devices are ideal, that is, the turn-on and turn-off times of G and D are ignored, and the device and line losses are ignored.

[0129] In order to ensure that the inductive current does not flow, while the output voltage remains stable, the Buck circuit adopts a double-loop control, ...

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Abstract

The invention discloses a control method for a parallel control structure of a linear controller and a model predictive controller, comprising: a linear controller discrete mathematical model module G 1 , Model Predictive Controller Discrete Mathematics Model Module G 2 and the controlled object discrete mathematical model module H; the error E between the input R of the parallel control structure and the output Y of the parallel control structure is used as G 1 with G 2 input, and then by G 1 Get the linear controller output C 1 , by G 2 Get the model predictive controller output C 2 , C 1 with C 2 The sum is the total output C of the parallel controller, and then C acts on H to obtain the output Y of the parallel control structure. The invention uses the linear controller and the model predictive controller in parallel, which has better dynamic response performance than the traditional linear controller and better robustness than the model predictive controller, and can control the output of the system faster when the input of the system changes The input can be accurately tracked, and the maximum percentage overshoot during the tracking process is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of power electronic control, and more specifically relates to a control method of a model predictive controller that considers the influence of the parallel linear controller under a control structure that uses a linear controller and a model predictive controller in parallel. Background technique [0002] Power electronic devices and systems are widely used in grid-connected inverters, DC / DC conversion, motor control, distributed power generation, uninterruptible power supply, etc. In order to ensure that these devices and systems can operate normally and achieve excellent control effects, It is necessary to continuously develop and optimize its control technology. The control methods currently applied to power electronic devices and systems mainly include: linear control, sliding mode control, model predictive control, etc. The linear control includes proportional-integral (Proportion Integration, PI) con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48H02M3/156
CPCH02M3/156H02M7/48H02M1/0045
Inventor 陈宇邱伟康康勇
Owner HUAZHONG UNIV OF SCI & TECH