Partial feedback linearization controller for flexible excitation system in synchronous generator

Yang, Ning and Wen, Jianfeng and Jiang, Lin (2024) Partial feedback linearization controller for flexible excitation system in synchronous generator. In: The 2024 International Conferences on Life System Modeling and Simulation (LSMS2024) & The 2024 Intelligent Computing for Sustainable Energy and Environment (ICSEE2024), 2024-09-13 - 2024-09-15, Suzhou.

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Abstract

The stability and control of power systems remain a challenge as the modern power system becomes more complex. A flexible excitation system (FES) based on fully controlled devices for the synchronous generator that can provide field voltage regulation and extra reactive power compensation, while the conventional half-controlled static excitation system (CSES) can only regulate field voltage for modern power systems stability enhancement. This paper applies the FES to the synchronous generator and proposes a nonlinear coordinated control strategy to enhance the voltage and rotor angle stability. To deal with the control of the nonlinear system which contains the synchronous generator and FES (SG-FES), the system is linearized to a two-input two-output system via partial feedback linearizing control (PFLC). With PFLC, the system is divided into a reduced-order linear part and a nonlinear dynamic autonomous part. The control method for SG-FES is tested with a single machine infinite bus (SMIB) system under a three-phase short circuit fault and small disturbance. The results show the effectiveness and better performance of the proposed control strategy compared with SG-CSES with conventional power system stabilizer, and avoid the need for rotor angle measurement compared with SG-FES with feedback linearization control.

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