Decoupled State-Feedback Based Control Scheme for the Distributed Generation System

Abstract

This article presents a new development for the decoupled state-feedback control to operate the distribution generation unit (DGU) within an efficient distribution generation system (DGS). The developed decoupled state-feedback is better than the conventional voltage vector control and sliding mode control for dealing with active and reactive power. Therefore, it is embraced to form a new control scheme, which is employed to effectively decouple and precisely control the injected active and reactive power to the distribution system. A five-level diode-clamped inverter is adopted to build the DGU in order to minimize the injected harmonics, facilitate the operation of the proposed control scheme, and ease the design of its passive filter. The proposed control scheme enables the DGS to be functional in several operational modes such as grid-connected, intentional islanding, unintentional islanding, anti-islanding, and ride-through modes. The effectiveness of the proposed control scheme is proved through the simulation results for all foregoing modes. Experimental results are provided to show how the proposed concepts are practically implemented to control the voltage of the DGU so that the active power and reactive power are exchanged between the power grid and the DGS in the grid-connected mode.

Keywords::

• decoupled state-feedback controller
• control scheme
• multilevel inverter
• distributed generation system
• grid-connected mode and stand-alone mode

Funding

This research work is sponsored by the University of Sharjah under the grant no. 1802040393-P.

Additional information

Notes on contributors

Amr Elnady

Amr Elnady graduated from the Electrical Power and Machines Dept., Cairo University, Cairo, Egypt, where he received the Master degree in Electric Power Engineering in 1998. He got his Ph.D. degree in 2004 from University of Waterloo, Waterloo, ON, Canada. Dr. Elnady had worded as a visiting staff at Queen's University from 2005 till 2007, Kingston, ON, Canada. He is an adjunct Associate Professor in the Electrical and Computer Engineering Dept. at the Royal Military College, Kingston, ON, Canada. His research interests include power-electronics applications in power systems, power quality in distribution systems, smart grids, and integration of renewable sources within power grids.

Ali Adam

Ali Adam received his Ph.D. degree in electrical engineering from Technical University of Yildiz, Istanbul, Turkey in 2007, and M.Sc. degree from Bagdad University, Iraq, in 1997, and B.Sc. degree in electrical engineering from University of Khartoum (UoK); Khartoum, Sudan, in 1991. Since 1991 he had been with the faculty of Engineering Science in Omdurman Islamic University in Sudan till 2009, where after he joined Fatih University as a staff member till 2013. Since then he is assistant professor in University of Sharjah; Sharjah, UAE. His main research of interest includes control of electrical, machines power electronics applications, propagation of low-frequency electromagnetic wave, and microcontroller-impeded systems as well as active and passive filters.