@article{alharbi_isik_alfaris_alkuhayli_bhattacharya_2022, title={A Fault Clearance and Restoration Approach for MMC-Based MTDC Grid}, volume={11}, ISSN={["2079-9292"]}, DOI={10.3390/electronics11142127}, abstractNote={With the growth in continuous energy demand, high-voltage Multi-Terminal DC (MTDC) systems are technically and economically feasible to transmit bulk power and integrate additional energy sources. However, the high vulnerability of the MTDC systems to DC faults, especially pole-to-pole (P2P) faults, is technically challenging. The development of DC fault ride-through techniques such as DC circuit breakers is still challenging due to their high cost and complex operation. This paper presents the DC fault clearance and isolation method for an MMC-based MTDC grid without adopting the high-cost DC circuit breakers. Besides, a restoration sequence is proposed to re-energize the DC grid upon clearing the fault. An MMC-based four-terminal DC grid is implemented in a Control-Hardware-in-Loop (CHIL) environment based on Xilinx Virtex-7 FPGAs and Real-Time Digital Simulator (RTDS). The RTDS results show that the MTDC system satisfactorily rides through DC faults and can safely recover after DC faults.}, number={14}, journal={ELECTRONICS}, author={Alharbi, Mohammed and Isik, Semih and Alfaris, Faris E. and Alkuhayli, Abdulaziz and Bhattacharya, Subhashish}, year={2022}, month={Jul} }
 @inproceedings{alkuhayli_safayet_husain_2015, title={Single-phase distributed generation synchronization with a distorted or weak grid}, DOI={10.1109/ecce.2015.7309819}, abstractNote={Fast and accurate synchronization of power electronics interfaced distributed generation to the grid or a microgrid is an important step in the management and utilization of the distributed energy resources. Several synchronization algorithms have been proposed to improve the phase tracking of the grid voltage. However, when the grid is weak or distorted, the synchronization process may suffer from poor frequency regulation. Therefore, Sliding Discrete Fourier Transform Phase-locked-loop (SDFT-PLL) algorithm is proposed to extract an accurate angle of the fundamental voltage while rejecting the harmonics in a distorted or weak grid. The SDFT-PLL algorithm and simulation results to validate this method are presented in this paper.}, booktitle={2015 ieee energy conversion congress and exposition (ecce)}, author={Alkuhayli, A. and Safayet, A. and Husain, I.}, year={2015}, pages={1143–1148} }