@article{alosaimi_aladhyani_alsubaie_alshammari_aljumah_bhattacharya_2025, title={Dual-Loop FCS-MPC with Online Grid Impedance Estimation for PV System Operating as STATCOM}, DOI={10.1109/ecce58356.2025.11259754}, abstractNote={This paper proposes a dual-loop finite control set model predictive control (FCS-MPC) strategy for a photovoltaic (PV) system operating as a static synchronous compensator (STATCOM). The inner loop implements FCS-MPC to regulate DC-link voltage and control reactive power through optimal switching state selection. To enhance control accuracy under varying grid conditions, an outer loop performs real-time estimation of grid inductance using a model-based approach embedded in the controller. This online estimator updates the predictive model at each sampling instant without requiring signal injection or offline calibration. The coordinated dual-loop architecture enables the PV inverter to adapt dynamically to changes in grid impedance, improving robustness and ensuring reliable voltage regulation and reactive power support. The proposed strategy is validated through Controller Hardware-in-the-Loop (C-HIL) testing, demonstrating its effectiveness in maintaining stability and performance under different operating scenarios.}, author={Alosaimi, Hamdan and Aladhyani, Hadhlul and Alsubaie, Mohammed and Alshammari, Sulaiman and Aljumah, Osamah and Bhattacharya, Subhashish}, year={2025}, month={Oct} }
 @article{alsubaie_burugula_alosaimi_aladhyani_aljumah_bhattacharya_2025, title={Multifunction Grid Forming Inverter for Harmonics Mitigation in AC Microgrid Systems}, DOI={10.1109/ecce58356.2025.11259613}, abstractNote={Power quality issues in modern power systems have become critical due to the proliferation of nonlinear loads in the power system. Most electronic devices and motor drives are designed to operate with direct current (DC). Since the available supply is alternating current (AC), a switch mode power supply (SMPS), such as a diode-bridge rectifier, is typically used to convert the AC supply to DC. However, this conversion process injects harmonic currents into the system, resulting in undesirable voltage and current distortions, which can threaten the power quality and stability of the microgrids. Voltage Source Inverters (VSIs) play a crucial role in modern microgrids by enabling the integration of distributed energy resources (DERs). This paper will extend the use of the VSIs operating in grid-forming mode to mitigate these harmonics actively. Stability analysis will be conducted to evaluate the performance of the proposed controller. Additionally, time domain simulations and hardware-in-the-Ioop (HIL) real-time simulations will be presented to show the effectiveness of this method.}, author={Alsubaie, Mohammed and Burugula, Vasishta and Alosaimi, Hamdan and Aladhyani, Hadhlul and Aljumah, Osamah and Bhattacharya, Subhashish}, year={2025}, month={Oct} }
 @article{aladhyani_alosaimi_alsubaie_nath_bhattacharya_2025, title={Stability Region Analysis of Parallel MMC-HVDC Systems for Offshore Wind Energy Integration}, DOI={10.1109/ecce58356.2025.11259635}, abstractNote={This paper presents a stability region analysis of parallel Multi-modular High-voltage Direct Current (MMC-HVDC) systems for offshore wind energy connection. The studied system consists of two aggregated offshore wind farms, each interfaced through back-to-back Voltage Source Converters (VSCs) and connected to a common onshore AC grid via parallel point-to-point MMC-HVDC links. Both offshore and onshore MMCs operate under grid-forming control (GFM). A sequence domain impedance modeling framework is used to capture frequency-dependent converter-grid interactions, and stability margins are assessed through eigenvalue-based frequency scan analysis. To improve damping and mitigate resonance, a reactive power circulation strategy is used, reshaping the impedance of the system without modifying the primary control loops. The proposed approach provides insight into coordinated impedance shaping in multi-terminal HVDC networks and supports the design of robust, stable offshore wind integration.}, author={Aladhyani, Hadhlul and Alosaimi, Hamdan and Alsubaie, Mohammed and Nath, Harshit and Bhattacharya, Subhashish}, year={2025}, month={Oct} }