MANAGEMENT OF HYBRID (AC-DC) MICRO-GRIDS

The objective of this thesis is to demonstrate the sharing demanded power in a single-phase hybrid micro grid operating in autonomous island mode. We assume that we have DC power sources such as a photovoltaic array and wind turbine in the DC sub-grid that is tied to the AC sub-grid consisting of two uninterruptible power sources (UPS) through a bi-directional single phase inverter. Demand-droop control is used to manage power sharing between power sources in each sub-grid; however, managing the power flow through the entire grid is still a challenge. To overcome this we develop droop control strategies for each sub-grid, and droop control for the interfacing converter. The latter, can be formed using available information from each sub-grid and a specific normalization technique for the droop control of the interfacing converter. In this thesis it is assumed that supply and demand are matched at all times, and the major problem addressed is managing power sharing. Simulation results using MATLAB are used to demonstrate the performance of the power sharing methodology developed in the thesis. Four different scenarios have been tested: (1) Both sub-grids have a heavy load, (2) both sub-grids have a light load, (3) a heavy DC load with a light AC load, and (4) a heavy AC load with a light DC load.

Name thesis:degree_name

Master of Sciences (Engineering)

Level thesis:degree_level

masters

Discipline thesis:degree_discipline

EECS - System and Control Engineering

Grantor dc:publisher

Case Western Reserve University School of Graduate Studies

Year dc:date

2013

Author dc:creator

• Alsharif, Sameer

Contributors dc:contributor

• Loparo, Kenneth

• Electrical Engineering

Statement dc:rights

• unrestricted
• This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.

Language dc:language

English

Repository record dc:identifier

http://rave.ohiolink.edu/etdc/view?acc_num=case1355191663

OAI identifier oai:identifier

oai:etd.ohiolink.edu:case1355191663