60kW grid-connected Interleaved inverter.

60kW Microgrid-based Line interactive UPS.

Electrical power systems

Key contact

M.A. Abusara received his BEng degree from Birzeit University, Palestine, in 2000 and his PhD degree from the University of Southampton, UK, in 2004, both in electrical engineering.

He has over ten years of industrial experience with Bowman Power Group, Southampton, UK, in the field of research and development of digital control of power electronics for distributed energy sources, hybrid vehicles, and machine and drives. During his years in the industry he designed and prototyped a number of commercial products that include grid and parallel connected inverters, MicroGrid, DC/DC converters for hybrid vehicles, and sensorless drives for high speed permanent magnet machines.

Research Interests

•    Microgrid
•    Grid-Connected Inverters for Renewable Energy Resources
•    Power Converters, Control and Topologies
•    High Speed Motor Drives

Current projects

Robust Microgrid Control System

A microgrid is an aggregation of Distributed Generators (DG) and loads. It can work in island standalone mode or in parallel with the main grid. The overall system of a microgrid is shown in the figure below.

Microgrid systems are one of the main building blocks of future Smart Grid technology. Microgrid technology has been a subject for research during the last 10 years. However, there still many technical challenges to be addressed in order to bring microgrid into full commercial use. This work is concerned with fundamental research into the controller of microgrid and its communication system in order to enhance robustness, reliability, and performance. 

Power electronic converters for photovoltaic farm grid interface

Conventional power electronic topologies used in DC/AC inverter have serious shortcomings when used to interface large (MW) solar PV farms to the grid. These shortcomings include using low frequency power switches, large and expensive filter components, and poor output power quality. This project is concerned with the investigation of using alternative power electronic topologies and control systems to interface a sub 5MW solar PV farm to the grid. The aim of the research is to increase the power capability of the DC/AC grid connected inverter, improve efficiency, enhance reliability and reduce cost. Research is focused on two main areas: Converter Topology and Converter Control.

Research into converter topology focuses on fundamental investigation of a novel multilevel/interleaved converter topology, which in effect comprises several low power high frequency multilevel bridge converters with output inductors connected in parallel. The switching instances of the paralleled converters are interleaved so that the switching frequency ripple component of the inductor currents sum to a low value which almost eliminates the requirement for filter capacitors. In addition, the high switching frequency achieved by using smaller power switches reduces the size of the filter inductors.

Research into the converter control system focuses on fundamental research into 1) improving power quality fed into the grid, 2) improving the system robustness of the PV system to grid disturbance such as voltage sags, 3) enhancing the system immunity to grid impedance variation and associated coupling between paralleled units, 4) maximizing power extraction from the PV modules.

Power System Laboratory

This laboratory has state of the art simulation software along with a Real Time simulation system. Additionally the laboratory has the capability of integrating small machine and for testing power conditioning systems.

 The overall system of a microgrid.
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