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Multi-feeder based FACTS devices are supposed to be a concept of more than a decade ago but the technologies are still not profound. However, there are some promising projects started in the recent years. A detailed study of these projects and selecting the best components is the first task for the design of the FACTS devices. In literature, different classifications of the FACTS devices may be found. The recent research projects are classified based on their features and explanations are given with respect to each classification. The load connected to the FACTS devices could be either the common voltage source or the distributed fixed voltage sources and the FACTS devices are classified accordingly. In all these projects, a single or multi-feeder are used for voltage/current balance in the FACTS devices. Some projects use the FREUs for helping in voltage/current balance[26] in FACTS devices, and there are few of them using them for active power balance[27]. So, in this thesis, the load connected to the FACTS devices is either the fixed voltage source(s) or the distributed or common voltage source and their configurations are proposed for improving the frequency stability and eliminating the multiple structures in the typical duplex converter. Several control strategies are proposed for improving the operation of the FACTS devices including modified methods of computer based controller, extended control strategies and hybrid control strategies.

The variable reactive power compensation devices are widely used in FACTS as a compensator for the voltage source converter (VSC) devices. The variable reactive power compensator is a device that can actively controll its reactive power. There are two main types of the reactive power including the constant reactive power and the constant active power[28]. The capacitor based constant active/reactive power compensator is widely used for active power compensation. However, the magnitude of its reactive power compensation ratio is possible to be in between 0 and 1. But the capacitor based constant active/reactive power based compensator has only one main end of its reactive power compensation ratio. The inductor based constant active/reactive power compensator is developed to compensate the active power and reactive power of the variable inductor-based devices. The inductor based constant active/reactive power based compensator has a potential to compensate the active power and reactive power of a single or multiple VSC devices. d2c66b5586