Non-linear Dynamic Modeling and Adaptive Control of a Power System with Unified Power Flow Controller

Abstract

The unified power flow controller is considered to be a promising device in the family of flexible AC transmission systems to enhance transient stability. This article documents some of the drawbacks of the conventional controllers used in the area of power system stability and proposes an approach that can overcome many of the shortcomings while delivering better performance. The novel approach proposed here includes developing a non-linear dynamic approximation of the power network, using a unified power flow controller as a controller, augmenting the unified power flow controller with non-linear adaptive control based on back-stepping for oscillation damping, and using an adaptive control law to approximate uncertain parameters that contribute significantly to the stability of the power system. The feasibility of the proposed technique is validated using simulation on a single-machine to infinite-bus system.

Keywords:

• dynamic stability
• non-linear control
• system oscillations
• unified power flow controller