VFT-STATCOM coordinated system for improved power transfer between asynchronous grids

• Published in: 2016 Biennial International Conference on Power and Energy Systems: Towards Sustainable Energy (PESTSE) pp. 1 - 5
• Main Authors: Sreelakshmi, C. S., Pramelakumari, K.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.01.2016
• Subjects: Automatic voltage control; Flexible AC Transmission Systems (FACTS); Integrated circuit interconnections; Load flow; Reactive power; Rotors; Static Synchronous Compensators (STATCOM); Transient analysis; Variable Frequency Transformer (VFT); Voltage fluctuations; Voltage Source Converter (VSC)
• DOI: 10.1109/PESTSE.2016.7516417

In recent years demand for quality power is more due to technological developments and increasing standard of living. The congestion due increase in load in the prevailing grids has led to grid interconnections. Apart from conventional methods a new alternative for grid interconnection, VFT (Variable Frequency Transformer), is recently been introduced for power transfer between synchronous as well as asynchronous areas. VFT which is a doubly fed induction machine, though claimed best for real power transfer, can also supply reactive power which is free flowing in nature and not a product of tuned circuit. Hence supply of reactive power is not assured to satisfy the demand. So need for a coordinated system rises in which VFT has to be assisted by a reactive power compensator to improve VFT response. STATCOM is well known as a device for reactive power compensation and voltage regulation in synchronous systems. The VFT-STATCOM coordinated system can have both the features of VFT and STATCOM. In this paper, the coordinated system is modeled and the performance during applied transient conditions is compared with that of system with VFT alone. Modeling and simulations are done with MATLAB/SIMULINK.