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Robust decentralized controller for minimizing coupling effect in single inductor multiple output DC-DC converter

Renan Landau Paiva de Medeiros¹, Walter Barra², Iury Valente de Bessa¹

¹Federal University of Amazonas - UFAM, Department of Electricity, Av. Rodrigo Octávio, 6200, Coroado I, CEP: 69080-900, Brazil.

ISA Transactions

|January 14, 2018

Summary

A new robust decentralized control method for single inductor multiple output (SIMO) DC-DC converters improves performance under parameter uncertainty. This approach offers superior results compared to traditional multiple input multiple output (MIMO) control techniques.

Keywords:

Effective relative gain array Integral square error performance index Pairing analysis Parametric uncertainties Robust decentralized controller Single inductor multiple output DC-DC converter

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Area of Science:

Electrical Engineering
Control Systems
Power Electronics

Background:

Single Inductor Multiple Output (SIMO) DC-DC converters are essential for efficient power management in modern electronics.
Controlling multiple outputs from a single inductor presents challenges due to inherent loop coupling and parametric uncertainties.
Existing control strategies often struggle to maintain performance under varying operating conditions.

Purpose of the Study:

To develop a novel robust decentralized control design methodology for SIMO DC-DC converters.
To attenuate loop coupling through systematic input-output pairing analysis.
To validate the proposed control strategy's effectiveness in the presence of parametric uncertainties.

Main Methods:

A nominal Multiple Input Multiple Output (MIMO) plant model was utilized for control design.
Input-output pairing analysis was performed to select optimal control pairings.
Plant uncertainty limits were defined and expressed in interval form.
A single inductor dual output (SIDO) DC-DC buck converter was developed for experimental validation.

Main Results:

The proposed decentralized control methodology demonstrated robust performance despite parametric uncertainties.
Experimental results confirmed the ability to maintain desirable performance levels.
Performance indexes indicated superior outcomes compared to classical MIMO control techniques.

Conclusions:

The developed robust decentralized control design is effective for SIMO DC-DC converters.
The methodology successfully addresses loop coupling and parametric variations.
This approach offers a significant advancement over existing MIMO control strategies for SIMO converters.