Partial feedback linearization controller for flexible excitation system in synchronous generator

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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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