4.7 Article

Interacting Multiple Model Strategy Based Adaptive Wide-Area Damping Controller Design for Wind Farm Embedded Power System

Journal

IEEE TRANSACTIONS ON SUSTAINABLE ENERGY
Volume 14, Issue 2, Pages 962-973

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TSTE.2022.3231647

Keywords

Wind turbine system; low-frequency oscillation; inter-area oscillation; wide area damping control; interacting multiple model strategy

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This paper presents a Wide-Area Damping Controller (WADC) to mitigate the impact of intermittent Wind Turbine Systems (WTSs) on Low-Frequency Oscillations (LFOs) in the power system. The WADC adopts a modal-based prescribed degree approach to adjust the positions of critical modes and provide adequate damping. However, the fixed operating point and time delay in feedback signals can lead to performance degradation, hence the use of an Interacting Multiple Model (IMM) framework to handle these uncertainties and maintain robust damping performance.
The intermittent nature of Wind Turbine Systems (WTSs) can severely affect the Low-Frequency Oscillations (LFOs) in the power system. Hence, a Wide-Area Damping Controller (WADC) is designed in this paper to provide adequate damping to critical LFO modes. This WADC utilizes a modal-based prescribed degree approach, ensuring the specified shift of concerned modes from their existing position. However, the design of WADC at a fixed operating point and time delay in feedback signals does not provide robust performance as these uncertainties may vary for different time intervals. Specifically, time-varying delays should be tackled appropriately, or the system's damping performance will be severely hampered. Keeping this in view, an Interacting Multiple Model (IMM) infrastructure is employed to provide robust damping performance for such uncertainties. The IMM strategy utilizes the deviation of output error between actual and probable plants, through which weights are assigned to corresponding probable WADCs via the Bayesian framework. The simulations are performed on the nonlinear 4-machine, 11-bus system and the complex 16-machine, 68-bus system using MATLAB/Simulink platform. The results demonstrate that the proposed IMM-based WADC furnishes adequate damping to critical LFO modes for operating point and time delay uncertainties.

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