Improved Low Voltage Ride-Through Strategy for Grid-Connected Photovoltaic Systems during Line-to-Line Fault
DOI:
https://doi.org/10.53799/w04ht470Abstract
With the increasing integration of photovoltaic (PV) systems into power grids, Low Voltage Ride-Through (LVRT) capability has become crucial for maintaining grid stability and reliability. Existing LVRT strategies often struggle with asymmetrical faults, leading to DC-link voltage fluctuations and inadequate reactive power support. This study proposes an improved integrated control method to enhance the LVRT capability of grid-tied PV systems during asymmetrical disturbances. The control strategy integrates DC-link voltage regulation, reactive power injection, and voltage sag compensation, considering both balanced and unbalanced fault conditions. A PI controller with cascaded control with feed-forward decoupling in the current loop is implemented for improved current control, while a Synchronous Reference Frame Phase-Locked Loop (SRF-PLL) ensures grid synchronization. This integrated approach offers advantages in system stability, rapid fault response, and grid code compliance. Simulation results for a 1.5 MW PV plant demonstrate the control's effectiveness, reducing grid voltage sag by 96.5%, injecting up to 78% of reactive power, and maintaining DC-link voltage within acceptable limits during Line-to-line faults.References
[1] S. Ahmad, H. Mubarak, U. K. Jhuma, T. Ahmed, S. Mekhilef, and H. Mokhlis, "Point of Common Coupling Voltage Modulated Direct Power Control of Grid‐Tied Photovoltaic Inverter for AC Microgrid Application," Int. Trans. Electr. Energy Syst., vol. 2023, no. 1, Art. no. 3641907, 2023.
[2] T. J. Rumky, T. Ahmed, M. Ahmed, S. Ahmad, and M. M. Rahman, "Performance of microgrid systems on multiple dynamic loads penetration," in Proc. 10th IEEE Int. Conf. Power Syst. (ICPS), 2023, pp. 1- 6.
[3] [3] Z. Hossain, S. Ahmad, U. K. Jhuma, S. Mekhilef, M. Mubin, H. Mokhlis, and T. Ahmed, "A Flexible Interconnection and Power Sharing Strategy For Two Autonomous Microgrid Systems," in Proc. IEEE 6th Int. Conf. Comput., Commun., and Autom. (ICCCA), 2021, pp. 472-477.
[4] U. K. Jhuma, S. Mekhilef, S. Ahmad, J. Islam, J. R. Jesan, and M. M. Billah, "The Impact of Synchronous Generator on Voltage Sag Mitigation in Power System Network," in Proc. IEEE 4th Int. Conf. Comput., Power and Commun. Technol. (GUCON), 2021, pp. 1-5.
[5] J. Rocabert, A. Luna, F. Blaabjerg, and P. Rodriguez, "Control of power converters in AC microgrids," IEEE Trans. Power Electron., vol. 27, no. 11, pp. 4734-4749, Nov. 2012.
[6] A. Merabet, L. Labib, A. M. Y. M. Ghias, C. Ghenai, and T. Salameh, "Robust feedback linearizing control with sliding mode compensation for a grid-connected photovoltaic inverter system under unbalanced grid voltages," IEEE J. Photovoltaics, vol. 7, no. 3, pp. 828-838, May 2017.
[7] S. Abbasi, A. A. Ghadimi, A. H. Abolmasoumi, M. R. Miveh, and F. Jurado, "Enhanced control scheme for a three-phase grid-connected PV inverter under unbalanced fault conditions," Electronics, vol. 9, no. 8, Art. no. 1247, 2020.
[8] P. P. Dash and M. Kazerani, "Dynamic modeling and performance analysis of a grid-connected current-source inverter-based photovoltaic system," IEEE Trans. Sustain. Energy, vol. 2, no. 4, pp. 443-450, Oct. 2011.
[9] Y. Gu, W. Li, and X. He, "Frequency-coordinating virtual impedance for autonomous power management of DC microgrid," IEEE Trans. Power Electron., vol. 30, no. 4, pp. 2328-2337, Apr. 2014.
[10] A. Mojallal and S. Lotfifard, "Enhancement of grid connected PV arrays fault ride through and post fault recovery performance," IEEE Trans. Smart Grid, vol. 10, no. 1, pp. 546-555, Jan. 2017.
[11] X. Guo, X. Zhang, B. Wang, W. Wu, and J. M. Guerrero, "Asymmetrical grid fault ride-through strategy of three-phase grid-connected inverter considering network impedance impact in low-voltage grid," IEEE Trans. Power Electron., vol. 29, no. 3, pp. 1064-1068, Mar. 2013.
[12] J. Miret, A. Camacho, M. Castilla, L. G. de Vicuña, and J. Matas, "Control scheme with voltage support capability for distributed generation inverters under voltage sags," IEEE Trans. Power Electron., vol. 28, no. 11, pp. 5252-5262, Nov. 2013.
[13] State Grid Corporation of China, "Grid Code for Wind Power Generation," Beijing, 2011.
[14] N. Espinoza and O. Carlson, "Field-test of wind turbine by voltage source converter," Wind Energy Sci., vol. 4, pp. 465-477, 2019.
[15] M. N. Tasnim, T. Ahmed, S. Ahmad, S. Mekhilef, and S. M. Ferdous, "Autonomous power management and control among interconnected standalone hybrid microgrids," in Proc. 10th IEEE Int. Conf. Power Syst. (ICPS), 2023, pp. 1-6.
[16] S. Ahmad, U. K. Jhuma, M. Karimi, A. Pourdaryaei, S. Mekhilef, H. Mokhlis, and K. Kauhaniemi, "Direct power control based on point of common coupling voltage modulation for grid-tied AC microgrid PV inverter," IEEE Access, vol. 10, pp. 109187-109202, 2022.
[17] S. Ahmad, S. Mekhilef, H. Mokhlis, M. Karimi, A. Pourdaryaei, T. Ahmed, U. K. Jhuma, and S. Afzal, "Fuzzy logic-based direct power control method for pv inverter of grid-tied ac microgrid without phase-locked loop," Electronics, vol. 10, no. 24, Art. no. 3095, 2021.
[18] S. Bagchi, D. Chatterjee, R. Bhaduri, and P. K. Biswas, "An improved low-voltage ride-through (LVRT) strategy for PV-based grid connected inverter using instantaneous power theory," IET Gener. Transm. Distrib., vol. 15, no. 5, pp. 883-893, 2021.
[19] M. N. Tasnim, T. Ahmed, M. A. Dorothi, S. Ahmad, G. M. Shafiullah, S. M. Ferdous, and S. Mekhilef, "Voltage-oriented control-based three-phase, three-leg bidirectional AC--DC converter with improved power quality for microgrids," Energies, vol. 16, no. 17, Art. no. 6188, 2023.
[20] Y. Bak, J. S. Lee, and K. B. Lee, "Low-voltage ride-through control strategy for a grid-connected energy storage system," Appl. Sci., vol. 8, no. 1, Art. no. 57, 2018.
[21] A. Q. Al-Shetwi, M. Z. Sujod, and F. Blaabjerg, "Low voltage ride-through capability control for single-stage inverter-based grid-connected photovoltaic power plant," Sol. Energy, vol. 159, pp. 665-681, 2018.
[22] S. I. Mahmud, M. A. Mannan, and M. R. Hazari, "Design and Performance Analysis of a PV Control Scheme to Improve LVRT of Hybrid Power System," AIUB J. Sci. Eng. (AJSE), vol. 20, no. 2, pp. 20-21, 2021.
[23] T. Orłowska-Kowalska, F. Blaabjerg, and J. Rodríguez, Eds., Advanced and Intelligent Control in Power Electronics and Drives. Berlin, Germany: Springer, 2014.
[24] M. Billah, S. Ahmad, M. R. Hazari, A. R. Sagor, T. Ahmed, S. Mekhilef, M. Seyedmahmoudian, A. Stojcevski, and O. Alshammari, "Integrated DC-link regulation and reactive power injection strategies for LVRT compliance of grid-tied PV systems," in Proc. Int. Conf. Electr. Electron. Eng., 2024, pp. 503–519.
Downloads
Published
Issue
Section
License
Copyright (c) 2026 AIUB Journal of Science and Engineering
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
AJSE contents are under the terms of the Creative Commons Attribution License. This permits anyone to copy, distribute, transmit and adapt the work non-commercially provided the original work and source is appropriately cited.
