Nonsingular fast terminal control for the DFIG-based variable-speed hydro-unit

Jianing Fu, Xiangyang Yu, Chunyang Gao, Junda Cui and Youting Li

Energy, 2022, vol. 244, issue PA

Abstract: Pumped storage power plants (PSPPs) with variable-speed hydro-units are credible when tackling the impact caused by the introduction of renewable energy into grids. However, the units suffer from instability when the grid transients occur because the adopted doubly-fed induction generators (DFIG) have a strong coupling and nonlinearity. Conventional controllers failed to handle this situation. Although the sliding mode controller (SMC) is robust enough, it has problems of infinite convergence time and chattering issues. Nonsingular fast terminal sliding mode controller (NFTSMC) - an advanced SMC - is a promising method to solve these problems. This paper took the DFIG-based variable-speed hydro-unit as the studied object and adopted a newly-designed NFTSMC in the rotor side converter to secure the stable operation of the unit. Especially, a feedback control law and a modified coefficient of the sliding mode surface were combined with the adaptive super-twisting algorithm to handle the additional information of the derivatives of the sliding mode surface and guarantee the theoretical stability. Simulations under load rejection, parameter variation, voltage dips were imposed on the unit. Results showed the proposed controller has lower settling times, oscillations, and less over-shooting. The efficiency of the proposed controller is thus proved.

Keywords: DFIG Variable speed hydro-unit; Nonsingular fast terminal sliding mode control; Super-twisting algorithm (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:244:y:2022:i:pa:s0360544221029212

DOI: 10.1016/j.energy.2021.122672

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