Abstract
Necessity of electricity access in remote area is the main reason for expanding decentralized energy system such as stand-alone power systems. The best electrical power supply must provide a constant magnitude and frequency voltage. Therefore, good power quality is an important factor for the reliable operation of electrical loads in a power system. However, the current drawn by most of electronic devices and non-linear loads are non-sinusoidal, which can result in a poor power quality, especially in off-grid power systems. Poor power quality is characterized by electrical disturbances such as transients, sags, swells, harmonics and even interruptions in the power supply. Off-grid power systems worldwide often struggle with system failures and equipment damage due to poor power quality. In this paper, MAT- LAB/Simulink is used to model and analyses power quality in an off-grid renewable energy system. The results show high voltage transient when the inductive loads were switched OFF. The voltage and current harmonics are also determined and compared for various types of loads.
Highlights
Energy demand increasing makes important problems such as grid instability or even outage
Good power quality is an important factor for the reliable operation of electrical loads in a power system
The results show high voltage transient when the inductive loads were switched OFF
Summary
Energy demand increasing makes important problems such as grid instability or even outage. More energy must be generated at the grid. Energy generation by big plant is not economically. Implementation of distributed generation is rapidly increased. Because of increasing global warming, limitation and high cost of fossil fuel sources, governments tend to increase use and implementation of renewable energy sources. The main difference between renewable energy and fossil fuels systems is up-front cost versus lifelong energy cost. In most development countries, governments as well as utilities provide a variety of incentives, to help the renewable energy industry reach to a higher economic scale. Solar/photovoltaic, wind, hydro, geothermal, tidal, wave and bio energy are examples of renewable energy sources which the solar/ photovoltaic and wind are most popular among them
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