Anti‐windup compensator design for power system subjected to time‐delay and actuator saturation. Issue 1 (23rd January 2019)

• Record Type: Journal Article
• Authors: Obaiah, Maddela Chinna; Subudhi, Bidyadhar
• Is Part Of: IET smart grid. Volume 2:Issue 1(2019)
• Page Start: 106
• Page End: 114
• Publication Date: 2019-01-23
• Subjects: compensation -- actuators -- power system stability -- damping -- Lyapunov methods -- closed loop systems -- nonlinear control systems -- power transmission control -- feedback -- oscillations -- delays -- control nonlinearities -- convex programming -- flexible AC transmission systems -- asymptotic stability -- robust control -- control system synthesis -- linear matrix inequalities; anti‐windup compensator design -- time‐delay -- delay‐dependent anti‐windup compensator -- supplementary damping control -- SDC -- flexible AC transmission system device -- inter‐area low‐frequency oscillations -- robust output feedback controller -- delay‐dependent AWC -- actuator saturation nonlinearity -- closed‐loop power system; B0210 Algebra -- B0260 Optimisation techniques -- B8110C Power system control -- B8120E a.c. transmission -- C1110 Algebra -- C1180 Optimisation techniques -- C1320 Stability in control theory -- C1340K Nonlinear control systems -- C3340H Control of electric power systems; Smart power grids -- Periodicals; Computer science -- Periodicals; Energy industries -- Periodicals; Broadcasting -- Periodicals; 333.79110285
• DOI: 10.1049/iet-stg.2018.0113
• Languages: English
• ISSNs: 2515-2947

Abstract

Abstract : In this study, a delay‐dependent anti‐windup compensator (AWC) is designed for supplementary damping control (SDC) of flexible AC transmission system (FACTS) device to enhance the damping of inter‐area oscillations of the power system subjected to time‐delay and actuator saturation. By employing global signal measurements, an SDC of FACTS device is designed without considering the effect of time‐delay and actuator saturation to stabilise the power system using a robust output feedback controller with pole placement approach. Then, based on the generalised sector condition and Lyapunov–Krasovskii functional, an add‐on delay‐dependent AWC is designed to mitigate the adverse effect of time‐delay and actuator saturation non‐linearity. For the design of delay‐dependent AWC, sufficient conditions guarantee the asymptotic stability of the closed‐loop power system are formulated in the form of linear matrix inequalities (LMIs). These conditions are cast into the LMI‐based convex optimisation problem to compute the AWC gains. To evaluate the effectiveness of the proposed controller, non‐linear simulations were performed first using MATLAB/Simulink. Then, the authors implemented the proposed controller in real‐time using the Opal‐RT digital simulator. From the obtained results, it is observed that the proposed controller enhances the damping of inter‐area oscillations by compensating the effect of time delay and actuator saturation.