2024 : 2 : 23
Hassan Bevrani

Hassan Bevrani

Academic rank: Professor
Education: PhD.
ScopusId: 55913436700
Faculty: Faculty of Engineering
Address: Dept. Of Electrical and Computer Eng, University of Kurdistan, Allameh Hamdi Blvd, Sanandaj PO Box 416, P. C: 66177-15175, Kurdistan, Iran
Phone: +98-87-33624001


Zero-Level Control Design in AC Microgrids: A Robust Multivariable Approach
High-gain proportional–integral (PI) controller, microgrid, multi-input multioutput (MIMO) control, voltage control.
Journal IEEE Transactions on Power Electronics
Researchers Hassan Bevrani ، Toshiji Kato ، Ali Mehrizi_Sani ، Yazdan Batmani ، Ali Rafiee


In this article, a multi-input multioutput robust proportional–integral (PI) controller is designed for zero-level control of ac microgrids. The study system is a voltage-sourced converter connected to the rest of the microgrid through a distribution line and an ac output filter. The design procedure of the proposed high-gain PI controller is independent from the state matrix of the distributed energy resources. Severe local load changes are considered as the system unknown disturbances. It is proved that the closed-loop system behaves like a first-order system with stable internal dynamics. As the bandwidth of the suggested zero-level control can be systematically adjusted, it can properly operate in both high and medium frequencies without considerable fluctuations and overshoots at the output. It is also shown that circulating currents, which can cause overcurrent conditions in power electronic devices and damage dc-link capacitors, are limited without using any limiters. By considering some realistic scenarios and through time-domain simulations in MATLAB/Simulink and a supporting experimental test, it is shown that the proposed strategy can successfully attenuate adverse effects of unknown disturbances on the load voltage of islanded microgrids.