A.T. Alahmad; A. Saffarian; S.G. Seifossadat; S.S. Mortazavi
Abstract
The widespread adoption of microgrids in electric power systems has brought numerous advantages such as decentralized control, reliability, cost-effectiveness, and environmental benefits. However, one of the most critical challenges faced by islanded microgrids is ensuring frequency and voltage stability. ...
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The widespread adoption of microgrids in electric power systems has brought numerous advantages such as decentralized control, reliability, cost-effectiveness, and environmental benefits. However, one of the most critical challenges faced by islanded microgrids is ensuring frequency and voltage stability. This paper addresses these stability issues that arise when microgrids operate independently, disconnected from the main network through the point of common coupling (PCC). These microgrids rely on renewable resources like photovoltaic (PV) systems, wind turbines, and energy storage systems, which often require DC to AC conversion through inverters to simulate synchronous generators. To overcome the frequency and voltage stability challenges, this research utilizes the droop control technique to regulate the active and reactive power of distribution generators (DGs). The droop control technique is implemented and simulated using MATLAB software, specifically employing a multi-DC bus-based inverter. The simulation results demonstrate that the DGs successfully supply the required total power to meet load demands while maintaining frequency and voltage stability. Through the droop control technique, active and reactive power sharing is achieved, ensuring stability at nominal values. The DGs can effectively maintain a constant power profile at desired values, even in the presence of static and dynamic loads.
M.A. Qasim; V.I. Velkin; A.K. Hassan
Abstract
Nowadays, renewable energy sources are considered better choices in the field of energy generation. It is possible to replace traditional energy sources (i.e., petroleum oil and gases) with more attractive alternatives. This presents several advantages, such as low emissions of greenhouse gases and reduction ...
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Nowadays, renewable energy sources are considered better choices in the field of energy generation. It is possible to replace traditional energy sources (i.e., petroleum oil and gases) with more attractive alternatives. This presents several advantages, such as low emissions of greenhouse gases and reduction of climatic change along with associated global warming. In the current paper, a comprehensive review is done introducing thermoelectric generation (TEG). These are applications of renewable energy sources that use the Seebeck effect to generate electricity. In this type of system, two different materials melt at their ends. One is on the hot side, while the other is used as a cold side. The present paper is a survey that includes applications and hybrid systems (based on renewable energy sources) that are integrated with a thermoelectric generator. Also, investigations of the effects of including thermoelectric generation in hybrid systems on the overall performance of such systems are reviewed. These systems can be viewed as an investment in recovery of waste heat from devices such as water pipes, photovoltaic panels, and vehicle exhaust to produce extra power in a hybrid system.
