Optimal Placement & Control Modeling of Unified Power Flow Controller Using Voltage Stability Index and α - β Transformation Theory for Multi-Machine Power System
Rishabh Shah,  Sarafraz Gandhi
The Unified Power Flow Controller (UPFC) is the most versatile and complex power electronic FACTS device that has emerged for the control and optimization of power flow in electrical power transmission system. In this study, Unified Power Flow Controller (UPFC) is designed and simulated by α-β transformation theory. Here the transformation of a three phase system (abc) to the 2-axis system (α-β) is done through which power profile can be controlled individually, while also regulating the local bus voltage. In this paper 3 machine 9 bus standard (WSCC) system is considered for implementation and analysis of unified power flow controller for different loading conditions. This paper also presents an optimal placement analysis of UPFC to determine the location and operating parameters for improving voltage profile in a power system. The location of UPFC is placed based on Voltage Stability Index (VSI) or L-index method for different loading conditions. All Simulations are done using Matlab/ Simulink12a and results obtained shows the effectiveness of the controller in improving the power profile and voltage profile of the system.
Keywords- UPFC, power flow control, α-β Theory, Voltage Stability Index, Optimal placement, L-index method
Cite this Article
Rishabh Shah,  Sarafraz Gandhi ,   "Optimal Placement & Control Modeling of Unified Power Flow Controller Using Voltage Stability Index and α - β Transformation Theory for Multi-Machine Power System "
, International Journal of Engineering Development and Research (IJEDR), ISSN:2321-9939, Volume.2, Issue 2, pp.1657-1666, June 2014, Available at :http://www.ijedr.org/papers/IJEDR1402063.pdf