Nowadays, the rapid development of power electronics has made that the old devices for controlling voltage based on capacitors and reactors have been replaced by Flexible AC Transmission Systems (FACTS).
New wind turbines have integrated different systems to withstand voltage dips; however the old wind turbines have to install different FACTS to overcome dips. The main solutions are installed either in each turbine or in the point of common coupling.
The FACTS used in wind systems can be divided into three categories depending on their connection (Amaris, 2007; Hingorain, 1999):
• Series device, for example the Dynamic Voltage Restorer (DVR)
• Shunt device, such as Static Voltage Compensator (SVC) and Static Compensator (STATCOM).
• Series-shunt device. They are a combination of a series and a parallel FACTS. In wind system Unified Power-Quality Conditioner (UPQC) are used.
Next, these systems are explained.
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