Robust Nonsingular Terminal Sliding Mode Control of a Buck Converter Feeding a Constant Power Load
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Date
2023
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Abstract
In recent years, DC microgrid systems feeding constant power loads (CPLs) have been
given a particular focus due to their effect on the overall system stability caused by their electrical
characteristics behaving as negative incremental impedance. To address this issue, this paper investi gates the stabilization of a DC bus voltage in a DC microgrid (MG) feeding a CPL. The output voltage
of the main DC bus is stabilized by using a robust nonsingular terminal sliding mode controller that is
characterized by the elimination of the singularity problem that arises from the conventional terminal
sliding mode controller. The CPL is emulated by a boost converter where its output voltage is tightly
regulated. The system is investigated in terms of voltage following and disturbance rejection. The
robustness and effectiveness of the proposed control strategy are assessed against input voltage
fluctuations and power demand variations. The proposed controller is validated through simulations
and an experimental setup
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Keywords
DC microgrid systems; constant power load; DC-DC converter; nonsingular terminal sliding mode controller; terminal sliding mode controller; incremental negative impedance (INI