Oscillation Suppression of Grid-Forming VSC-HVDC System Based on Fixed-Time Sliding Mode Control

doi:10.3969/j.issn.1008-0198.2024.04.012

Abstract

Abstract: The grid-forming voltage source converter based high voltage direct current(VSC-HVDC)system is connected to the grid, which supports the voltage and frequency of the grid. This paper focuses on the oscillation problem caused by the receiving end grid of grid-forming VSC-HVDC system and proposes a fixed-time sliding mode control method to damp the oscillation. First, a mathematical model of the grid-forming VSC-HVDC system is established based on virtual synchronous generator control. Then, a nonlinear fixed time sliding mode control method is proposed for oscillation suppression control according to the sliding mode control and fixed time stability theory. Furthermore, Lyapunov theory proves that the proposed nonlinear fixed time sliding mode control can realize the restoration of stability of the grid-forming VSC-HVDC system within the fixed time. Finally, a simulation model of the grid-forming VSC-HVDC system is constituted on MATLAB/Simulink and the simulation results verify the validity and superiority of the proposed method in oscillation suppression.

Key words: grid-forming VSC-HVDC system, virtual synchronous generator control, oscillation suppression, sliding mode control, fixed time stability

CLC Number:

TM721.1

ZHU Sirui, WANG Canlin, ZHANG De, LI Yong, ZHOU Yang, WEN Ting. Oscillation Suppression of Grid-Forming VSC-HVDC System Based on Fixed-Time Sliding Mode Control[J]. Hunan Electric Power, 2024, 44(4): 84-92.

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