Application of the direct Lyapunov method for robust finite-time power flow control with a unified power flow controller


Unified power flow controller (UPFC) is one in every of the most versatile and complex flexible AC transmission system devices to have emerged with a proven capability of instantaneous management of transmission line parameters. This study presents an approach primarily based on the direct Lyapunov stability theory with finite-time convergence and chattering free characteristics to enhance the ability flow management in transmission lines employing a UPFC. A state variable management strategy is derived and implemented to tackle the problems of reference tracking, robustness against parameter uncertainty and external disturbances. The main goal of the presented management system is power flow control with finite-time convergence of system states??. The chattering phenomena and discontinuity of the controller that is common in finite-time controllers are removed to get endless and swish controller. Simulation results are given for example the effectiveness of the proposed algorithm. It is shown that the settling time of the system enhanced with the proposed controller is considerably less than the standard non-linear controllers. As the foremost merely measurable states of the system are employed in the advised controller, there is no want to design a state area variable observer system. The proposed controller is investigated on the UPFC connected to a twobus Power System.

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