Robust Output Feedback Control of the Voltage Source Inverter in an AC Microgrid

Hamid Saeed Khan and Attaullah Y. Memon
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Hamid Saeed Khan: Department of Electronics & Power Engineering, PN Engineering College, National University of Science and Technology, Karachi 75350, Pakistan
Attaullah Y. Memon: Department of Electronics & Power Engineering, PN Engineering College, National University of Science and Technology, Karachi 75350, Pakistan

Energies, 2022, vol. 15, issue 15, 1-21

Abstract: This paper presents the mathematical model and control of the voltage source inverter (VSI) connected to an alternating current (AC) microgrid. The VSI used in this work was a six-switch three-phase PWM inverter, whose output voltages were controlled in a synchronous ( d q ) reference frame via a sliding mode control strategy. The control strategy required only output voltages; other states of the system were estimated by using a high-gain observer. The power-sharing among multiple inverters was achieved by solving power flow equations of the electrical network. The stability analysis showed that the error was ultimately bound in the case of the real PWM inverter and/or with a nonlinear load in the electrical network. The microgrid was simulated using the SimPowerSystems Toolbox from MATLAB/Simulink. The simulation results show the effectiveness of the proposed control scheme. The output voltage regulation of the inverter and power-sharing was achieved with the ultimately bounded error for the linear load. Later, the nonlinear load was also included in the electrical network and the error was shown to remain ultimately bounded. The output voltage regulation and power-sharing were achieved with the nonlinear load in the system.

Keywords: microgrids; observers; output feedback; power system control; sliding mode control; voltage control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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