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Abstract By incorporating back-to-back voltage-source converters between the main grid and the regional grid, asynchronous interconnection of the grids can be formed to achieve a scenario of 100% renewable energy islanding operation of the regional grid. The paper begins by detailing the electrical wiring and structural configuration of the regional grid. It then performs a thorough evaluation of traditional fault current suppression techniques during a single-phase-to-ground fault in transmission lines powered solely by renewable energy. To improve low voltage ride-through capabilities, the study introduces an advanced strategy that employs an adaptive control of positive and negative sequence components, combined with DC bus voltage stabilization. The efficacy of this approach is substantiated through hardware-in-the-loop simulations and empirical field testing. Results show a substantial reduction in the regional grid's negative sequence component and harmonic content by 18.5% and 81.7%, respectively. Moreover, the DC voltage oscillation is effectively suppressed following the initiation and clearance of a single-phase-to-ground fault.
Xiong et al. (Wed,) studied this question.