Robust sliding mode controller for buck DC converter in off-grid applications

Emad Awada, Eyad Radwan, Mutasim Ibrahim Nour

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

This paper presents a robust sliding mode controller of DC-DC buck converter for renewable energy applications, such as photovoltaic systems in off-grid configurations. Photovoltaic systems in off-grid configuration are exposed to significant variations in input voltage and power loads. The proposed sliding mode controller presents a simple and efficient method of continuously updating the duty cycle of a pulse width modulation unit (PWM) of a buck converter. The PWM unit is operated at constant switching frequency of 10 kHz carrier signal and varying duty cycle. The differences in input voltage and power load are treated as two bounded uncertainties, thus eliminating the need for input voltage sensor and output current sensors leaving the system with a single sensor required to measure the converter output voltage. That is, measured output voltage is compared with the reference voltage to continuously update the average duty cycle value of PWM unit. Adjustment of PWM duty cycle is performed while maintaining the sliding condition always fulfilled. The simulation results of the proposed controller showed robustness and accuracy against power load fluctuation, changes in desired output voltage, and variations in the input supply voltage that may result from the varying level of irradiance and temperature.

Original languageEnglish
Pages (from-to)2425-2433
Number of pages9
JournalBulletin of Electrical Engineering and Informatics
Volume11
Issue number5
DOIs
Publication statusPublished - Oct 2022

Keywords

  • Buck converter
  • Constant frequency duty cycle
  • Parametric uncertainty
  • Renewable energy
  • Sliding mode control

ASJC Scopus subject areas

  • Computer Science (miscellaneous)
  • Control and Systems Engineering
  • Information Systems
  • Instrumentation
  • Hardware and Architecture
  • Computer Networks and Communications
  • Control and Optimization
  • Electrical and Electronic Engineering

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