Robust Decentralized Control of Unified Power Flow Controller

A new approach based on structured singular value is proposed for the robust decentralized Unified Power Flow Controller (UPFC) design. To achieve decentralization, using the schauder fixed point theorem the synthesis and analysis of Multi-Input Multi-output (MIMO) control system is translated into set of equivalent Multi-Input Single-Output (MISO) control system. Power systems such as the other industrial plants contain different kinds of uncertainties, which should be considered in controller design procedure. For this reason, the idea of µ-synthesis technique was used for designing of UPFC controllers. The proposed µ-based controller has a decentralized scheme and advantage of a decentralized controller design is reduction in the controller complexity and suitability for practical implementation. The effectiveness of the proposed control strategy was evaluated under operating conditions for damping low frequency oscillations in comparison with the classical controller to demonstrate its robust performance through nonlinear time simulation and some performance indices.

[1]  I. Horowitz.  Quantitative synthesis of uncertain multiple input-output feedback system† , 1979 .

[2]  P. L. So,et al.  Coordination of TCSC and SVC for inter-area stability enhancement , 2000, PowerCon 2000. 2000 International Conference on Power System Technology. Proceedings (Cat. No.00EX409).

[3]  M. L. Kothari,et al.  Damping of Power System Oscillations using Unified Power Flow Controller ( UPFC ) , 2003 .

[4]  K. R. Padiyar,et al.  Coordinated design and performance evaluation of UPFC supplementary modulation controllers , 2005 .

[5]  Ganapati Panda,et al.  TS-fuzzy controller for UPFC in a multimachine power system , 2000 .

[6]  San Shing Choi,et al.  A robust control method to improve the performance of a unified power flow controller , 2000 .

[7]  K.Y. Lee,et al.  Choice of FACTS device control inputs for damping interarea oscillations , 2004, IEEE Transactions on Power Systems.

[8]  Seyed Abbas Taher,et al.  Design of Robust UPFC Controller Using H Control Theory in Electric Power System , 2008 .

[9]  Felix F. Wu,et al.  Application of unified power flow controller in interconnected power systems-modeling, interface, control strategy, and case study , 2000 .

[10]  Hossein Shayeghi,et al.  Robust Decentralized LFC Design in a Restructured Power System , 2006 .

[11]  Ganapati Panda,et al.  A radial basis function neural network controller for UPFC , 2000, 2000 Power Engineering Society Summer Meeting (Cat. No.00CH37134).

[12]  M. A. Abido,et al.  A particle-swarm-based approach of power system stability enhancement with unified power flow controller , 2007 .

[13]  Laszlo Gyugyi,et al.  Unified power-flow control concept for flexible AC transmission systems , 1992 .

[14]  B. C. Pal,et al.  Robust damping of interarea oscillations with unified power-flow controller , 2002 .

[15]  Aleksandar M. Stankovic,et al.  Modeling of UPFC Operation under Unbalanced Conditions with Dynamic Phasors , 2002, IEEE Power Engineering Review.