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Dynamic Modeling and Analysis of Buck Converter based Solar PV Charge Controller for Improved MPPT Performance

Venkatramanan, D and John, Vinod (2018) Dynamic Modeling and Analysis of Buck Converter based Solar PV Charge Controller for Improved MPPT Performance. In: 2018 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES), 18-21 Dec. 2018, Chennai.

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Official URL: https://doi.org/10.1109/PEDES.2018.8707505

Abstract

Maximum power point tracking (MPPT) control is a key functionality in solar photo-voltaic (PV) based power generation systems that enhances the efficacy of energy extraction. A pulse-width modulated (PWM) power converter connected to the PV is designed to perform this essential function. A variety of MPPT control schemes are available in literature, many of which are voltage based techniques wherein the PV bus voltage is controlled in closed loop to the required level that achieves MPP tracking. However, a suitable plant model of the PV fed converter system that facilitates the design of such a PV voltage control loop for MPPT purpose, is not fully covered in literature. In this paper, a small-signal model is developed for a buck converter based charger system fed by a PV source, which is a non-linear active source. Based on this model, the relevant transfer functions are analytically derived. The control to converter input voltage transfer-function (v) over tilde (in)/(d) over bar thus obtained, is useful in the systematic design of voltage controller bandwidth, that facilitates the selection of perturbation period of a typical perturb & observe (P&O) MPPT controller. Such an approach for control design is verified in this work on a PV system with energy storage, which is typically used in dual-mode or standalone PV applications. The P&O MPPT control is validated on a buck PV charge controller system employing a 36 V battery bank. Experiments conducted on a 1 kW hardware prototype verify the accuracy of the proposed analytical transfer-functions and the performance of the PV-charger system.

Item Type: Conference Proceedings
Additional Information: 8th IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES), Chennai, INDIA, DEC 18-21, 2018
Keywords: Solar PV; battery charging; MPPT; buck converter modeling; frequency response analysis; control transfer-function
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Division of Electrical Sciences > Electrical Communication Engineering > Electrical Communication Engineering - Technical Reports
Depositing User: Id for Latest eprints
Date Deposited: 20 Jun 2019 18:24
Last Modified: 26 Jun 2019 17:59
URI: http://eprints.iisc.ac.in/id/eprint/62999

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