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Volume 7 Issue 1
Jan.  2020

IEEE/CAA Journal of Automatica Sinica

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Article Navigation >  IEEE/CAA Journal of Automatica Sinica  > 2020  >  7(1): 106-117
Maddela Chinna Obaiah and Bidyadhar Subudhi, "A Delay-Dependent Anti-Windup Compensator for Wide-Area Power Systems With Time-Varying Delays and Actuator Saturation," IEEE/CAA J. Autom. Sinica, vol. 7, no. 1, pp. 106-117, Jan. 2020. doi: 10.1109/JAS.2019.1911558
Citation: Maddela Chinna Obaiah and Bidyadhar Subudhi, "A Delay-Dependent Anti-Windup Compensator for Wide-Area Power Systems With Time-Varying Delays and Actuator Saturation," IEEE/CAA J. Autom. Sinica, vol. 7, no. 1, pp. 106-117, Jan. 2020. doi: 10.1109/JAS.2019.1911558
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A Delay-Dependent Anti-Windup Compensator for Wide-Area Power Systems With Time-Varying Delays and Actuator Saturation

doi: 10.1109/JAS.2019.1911558
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    Abstract
  • In this paper, a delay-dependent anti-windup compensator is designed for wide-area power systems to enhance the damping of inter-area low-frequency oscillations in the presence of time-varying delays and actuator saturation using an indirect approach. In this approach, first, a conventional wide-area damping controller is designed by using $ H_{\infty} $ output feedback with regional pole placement approach without considering time-varying delays and actuator saturation. Then to mitigate the effect of both time-varying delays and actuator saturation, an add-on delay-dependent anti-windup compensator is designed. Based on generalized sector conditions, less conservative delay-dependent sufficient conditions are derived in the form of a linear matrix inequality (LMI) to guarantee the asymptotic stability of the closed-loop system in the presence of time-varying delays and actuator saturation by using Lyapunov-Krasovskii functional and Jensen integral inequality. Based on sufficient conditions, the LMI-based optimization problem is formulated and solved to obtain the compensator gain which maximizes the estimation of the region of attraction and minimizes the upper bound of $ L_{2} $-gain. Nonlinear simulations are performed first using MATLAB/Simulink on a two-area four-machine power system to evaluate the performance of the proposed controller for two operating conditions, e.g., 3-phase to ground fault and generator 1 terminal voltage variation. Then the proposed controller is implemented in real-time on an OPAL-RT digital simulator. From the results obtained it is verified that the proposed controller provides sufficient damping to the inter-area oscillations in the presence of time-varying delays and actuator saturation and maximizes the estimation of the region of attraction.

     

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    Highlights

    • A new delay-dependent anti-windup compensator is designed for inter-area oscillations.
    • Actuator saturation effect represented by a generalized sector condition.
    • A new L-K functional proposed to include the effect of time-varying delays.
    • Delay-dependent stabilization conditions derived in LMI using proposed L-K functional.
    • The designed DDAWC with H-infinity controller improves the closed-loop performance.

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