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Isolated Site Wind System Start-Up System

Isolated Site Wind System Start-Up System

Lema Gharsellaoui (The National School of Engineers of Sfax, Tunisia) and Moez Ghariani (Laboratory of the Advanced Electronic Systems and the Durable Energy (ESSE), National School of Electronics and Telecoms of Sfax, Tunisia)
Copyright: © 2021 |Pages: 22
DOI: 10.4018/IJSPPC.2021040103
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Abstract

The abundant energy available in nature can be harnessed and converted to electricity in a sustainable way to supply the necessary power to elevate the living standards of the people without access to the electricity grid. Wind power is one of the cleanest and safest of all the renewable commercial methods of generating electricity. However, wind energy is difficult to use due to its stochastic variability. Energy storage can overcome the main drawback. This article consists of studying a wind starting system based on DFIG and operating in isolated mode. This system is formed by a bank of batteries and a bidirectional DC/DC converter charging a DC bus voltage as well as these batteries. The control of this system required a cascade control. Such control needs two loops: the inside loop to control the inductive current and the outside one for continuous voltage bus. The theoretical study of this command has been validated using PSIM software.
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2. The Complete System To Be Studied

In this work, we must ensure the start-up of the wind system in order to assure a well determined voltage value at the DC bus, so we appeal to use a battery bank and an intermediate circuit how presents which is provided by a bidirectional chopper to provide charging and discharging of the battery (Figure 1).

Figure 1.

Starting an isolated wind power system

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3. Modeling Of The Battery

In this case, an AGM –type battery was chosen since this type is designed for start-up applications. In fact, a starter battery is designed to produce a large current for a very short time. A battery is made up of a series of cells, connected in series in order to obtain the desired output voltage. The output for a lead acid cell is approximately 2V so for a 12V battery there are 6 cells connected in series.

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