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Predictive control method for optimized output track of DC-DC converter discrete model

A DC-DC and predictive control technology, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve the problems of single operation mode of DC-DC converter, large amount of calculation, inability to perform online optimization, etc. Achieve the effect of avoiding voltage overshoot, simple mathematical model, and realizing online calculation

Inactive Publication Date: 2015-05-27
XIAN UNIV OF TECH
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Problems solved by technology

[0006] The purpose of the present invention is to provide a predictive control method for optimizing the output trajectory of a DC-DC converter discrete model, which solves the problem that the model predictive control in the prior art has a large amount of calculation and cannot be optimized online; the control strategy is only applicable to DC-DC converters. The single operation mode of the DC converter; only a single expected value can be set for the output voltage of the converter, which may easily cause the problem of overshoot voltage during the start-up process of the converter

Method used

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  • Predictive control method for optimized output track of DC-DC converter discrete model

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Embodiment

[0081] The DC-DC converter uses a non-isolated Boost converter. The circuit topology of an ideal Boost converter is as follows: Figure 4 As shown, the design method is as follows:

[0082] Step 1: Determine the discrete prediction model of the Boost transformer

[0083] according to Figure 4 According to the operating characteristics of the Boost converter circuit shown, the state space formulas shown in formula (1) and formula (4) can be obtained, where A 1 ~A 3 and B 1 ~B 2 The matrix of five coefficients is:

[0084] A 1 = - 1 RC 0 0 0 , B 1 = 0 ...

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Abstract

The invention discloses a predictive control method for the optimized output track of a DC-DC converter discrete model. The predictive control method comprises the following steps: step 1, establishing a discrete predictive model of a DC-DC converter; step 2, determining the steady-state voltage and the current characteristic of the discrete predictive model; step 3, determining the objective function of the discrete predictive model; step 4, determining a predictive control strategy. The method has the simple mathematical model and small computational amount of optimization problem solving and can realize online computation of control decisions. The method can work alone in a CCM, also can work alone in a DCM, and also can work in the mixed mode of the CCM and DCM. The method can avoid the voltage overshoot phenomenon of the DC-DC converter in the starting process and also has the accuracy and fastness of the DC-DC converter for regulation of output voltage under various running conditions.

Description

technical field [0001] The invention belongs to the technical field of direct current power converter control, and relates to a predictive control method for optimizing an output track of a discrete model of a DC-DC converter. Background technique [0002] DC-DC converters are widely used in various industrial fields and have wide operating conditions. Since the converter is a hybrid system with rich linear and nonlinear phenomena, the control of DC-DC converters has always been valued by researchers. , especially the regulation of the output voltage under various operating conditions (load disturbance or input disturbance). With the improvement of the computing power of control chips and the development of hybrid system control technology, model predictive control (MPC) technology has been introduced into the field of DC-DC converter control. [0003] Model predictive control has been successfully used in the field of industrial process control. Process control has slow dy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
Inventor 冷朝霞刘庆丰陆唯平
Owner XIAN UNIV OF TECH
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