Fuzzy logic-based direct power control method for PV inverter of grid-tied ac microgrid without phase-locked loop

Ahmad, Shameem and Mekhilef, Saad and Mokhlis, Hazlie and Karimi, Mazaher and Pourdaryaei, Alireza and Ahmed, Tofael and Jhuma, Umme Kulsum and Afzal, Suhail (2021) Fuzzy logic-based direct power control method for PV inverter of grid-tied ac microgrid without phase-locked loop. Electronics, 10 (24). ISSN 2079-9292, DOI https://doi.org/10.3390/electronics10243095.

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A voltage source inverter (VSI) is the key component of grid-tied AC Microgrid (MG) which requires a fast response, and stable, robust controllers to ensure efficient operation. In this paper, a fuzzy logic controller (FLC)-based direct power control (DPC) method for photovoltaic (PV) VSI was proposed, which was modelled by modulating MG's point of common coupling (PCC) voltage. This paper also introduces a modified grid synchronization method through the direct power calculation of PCC voltage and current, instead of using a conventional phase-locked loop (PLL) system. FLC is used to minimize the errors between the calculated and reference powers to generate the required control signals for the VSI through sinusoidal pulse width modulation (SPWM). The proposed FLC-based DPC (FLDPC) method has shown better tracking performance with less computational time, compared with the conventional MG power control methods, due to the elimination of PLL and the use of a single power control loop. In addition, due to the use of FLC, the proposed FLDPC exhibited negligible steady-state oscillations in the output power of MG's PV-VSI. The proposed FLDPC method performance was validated by conducting real-time simulations through real time digital simulator (RTDS). The results have demonstrated that the proposed FLDPC method has a better reference power tracking time of 0.03 s along with reduction in power ripples and less current total harmonic distortion (THD) of 1.59%.

Item Type: Article
Funders: Academy of Finland [Grant No: Profi4/WP2], Business Finland [GranT nO: 6844/31/2018]
Uncontrolled Keywords: microgrid; PLL; RTDS; direct power control; fuzzy logic; voltage source inverter
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Q Science > QC Physics
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering > Department of Electrical Engineering
Depositing User: Ms Zaharah Ramly
Date Deposited: 30 Jun 2022 07:02
Last Modified: 30 Jun 2022 07:02
URI: http://eprints.um.edu.my/id/eprint/33975

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