DC-BUS VOLTAGE CONTROL OF A GRID-CONNECTED PHOTOVOLTAIC INVERTER USING A PI–FUZZY CONTROLLER
DOI:
https://doi.org/10.62985/j.huit_ojs.vol26.no2E.387Từ khóa:
DC-bus voltage, grid-tied photovoltaic inverter, PI–Fuzzy control, fuzzy logic controller, voltage stabilityTóm tắt
This paper presents an adaptive DC-bus voltage control scheme using a proportional-integral fuzzy (PI–Fuzzy) controller for a three-phase grid-tied photovoltaic (PV) inverter operating under varying solar irradiance conditions. The proposed control strategy is implemented in the outer DC-bus voltage control loop, where a fuzzy logic controller is employed to adaptively tune the PI controller gains based on the DC-bus voltage error and its variation, aiming to improve dynamic performance and robustness against power fluctuations. A mathematical model of the grid-connected PV inverter system is developed in the synchronous reference frame to analyze the DC-bus dynamics and control behavior. The effectiveness of the proposed PI Fuzzy controller is validated through MATLAB/Simulink simulations under different irradiance levels and compared with a conventional fixed-parameter PI controller. Simulation results demonstrate that the proposed approach significantly reduces DC-bus voltage overshoot, shortens the settling time, and suppresses steady-state voltage oscillations, confirming its suitability for DC-bus voltage stabilization in three-phase grid-tied PV inverter systems.
Tài liệu tham khảo
[1] Y. Wang, J. Lu, Y. Zhang, and H. Huang, “Research on key technologies of smart grid supporting smart city,” International Journal of Smart Grid and Clean Energy, vol. 4, no. 3, pp. 199–208, 2015, doi: https://doi.org/10.12720/sgce.4.3.199-208.
[2] B. Yu, M. Matsui, and G. Yu, “A review of current anti-islanding methods for photovoltaic power systems,” Solar Energy, vol. 84, no. 5, pp. 745–754, 2010, doi: https://doi.org/10.1016/j.solener.2010.01.018.
[3] A. O. Althobaiti, “Proportional resonant control of three-phase grid-connected inverter during abnormal grid conditions,” Ph.D. dissertation, School of Engineering, Newcastle Univ., Newcastle upon Tyne, U.K., 2018. [Online]. Available: http://theses.ncl.ac.uk/jspui/handle/10443/3987.
[4] F. Iov, M. Ciobotaru, D. Sera, R. Teodorescu, and F. Blaabjerg, “Power electronics and control of renewable energy systems,” in Proc. 7th IEEE International Conference on Power Electronics and Drive Systems (PEDS), Bangkok, Thailand, 2007, pp. P-6–P-28, doi: https://doi.org/10.1109/PEDS.2007.4487719.
[5] T. Aung and T. L. Naing, “DC-link voltage control of DC–DC boost converter–inverter system with PI controller,” International Journal of Electrical and Computer Engineering, vol. 12, no. 11, pp. 833–841, 2018, doi: https://doi.org/10.5281/zenodo.2021969.
[6] M. Karimi-Ghartimani, S. A. Khajehoddin, P. Jain, and A. Bakhshai, “A systematic approach to DC-bus control design in single-phase grid-connected renewable converters,” IEEE Transactions on Power Electronics, vol. 28, no. 7, pp. 3158–3166, Jul. 2013, doi: https://doi.org/10.1109/TPEL.2012.2227508.
[7] Y. Guo, B. C. Pal, and R. A. Jabr, “Dynamic voltage support control of inverter-based resources in weak grids,” IEEE Transactions on Power Systems, 2021, doi: https://doi.org/10.1109/TPWRS.2021.3050562.
[8] H. E. Aboadla, A. A. Zaki, and M. A. Elgendy, “Maximum power extraction and DC-bus voltage regulation in grid-connected PV/BES system using modified incremental conductance,” Scientific Reports, vol. 12, 2022, doi: https://doi.org/10.1038/s41598-022-05041-0.
[9] H. Li, Y. Huang, and J. Lu, “Reactive power compensation and DC-link voltage control using fuzzy–PI on grid-connected PV system with D-STATCOM,” in Proc. IEEE PES Asia-Pacific Power and Energy Conference (APPEEC), Xi’an, China, Oct. 2016, pp. 1240–1244, doi: https://doi.org/10.1109/APPEEC.2016.7779691.
[10] H. A. Ismail, A. Alenany, and B. Abozalam, “Improved DC-link voltage controller for photovoltaic on-grid systems,” Indonesian Journal of Electrical Engineering and Informatics, vol. 9, no. 2, pp. 442–452, Jun. 2021, doi: https://doi.org/10.52549/ijeei.v9i2.3071.
[11] A. Kusmantoro, M. H. Purnomo, A. Priyadi, and V. L. B. Putri, “Fuzzy-PID controller on MPPT PV to stabilize DC bus voltage,” in Proc. 2019 International Conference on Technologies and Policies in Electric Power and Energy (TPEPE), Yogyakarta, Indonesia, Oct. 2019, pp. 10–15, doi: https://doi.org/10.1109/IEEECONF48524.2019.9102618.
[12] A. D. Martin and J. R. Vazquez, “MPPT algorithms comparison in PV systems: P&O, PI, neuro-fuzzy and backstepping controls,” in Proc. IEEE International Conference on Industrial Technology (ICIT), 2015, pp. 2841–2847, doi: https://doi.org/10.1109/ICIT.2015.7125476.
[13] A. I. Dounis, S. Stavrinidis, P. Kofinas, and D. Tseles, “Fuzzy-PID controller for MPPT of PV system optimized by Big Bang–Big Crunch algorithm,” in Proc. IEEE International Conference on Fuzzy Systems (FUZZ-IEEE), 2015, doi: https://doi.org/10.1109/FUZZ-IEEE.2015.7337886.
[14] L. Xu and D. Chen, “Control and operation of a DC microgrid with variable generation and energy storage,” IEEE Transactions on Power Delivery, vol. 26, no. 4, pp. 2513–2522, Oct. 2011, doi: https://doi.org/10.1109/TPWRD.2011.2157856.
[15] P. Sanchis, A. Ursaea, E. Gubia, and L. Marroyo, “Boost DC–AC inverter: A new control strategy,” IEEE Transactions on Power Electronics, vol. 20, no. 2, pp. 343–353, Mar. 2005, doi: https://doi.org/10.1109/TPEL.2004.843000.
