The quantum‐mode regulated power point tracking in a photovoltaic array for application under the quantised converter duty ratio

Reddy, M. Kranthi Kumar and Sarkar, Vaskar (2021) The quantum‐mode regulated power point tracking in a photovoltaic array for application under the quantised converter duty ratio. IET Renewable Power Generation, 15 (8). pp. 1748-1764. ISSN 1752-1416

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Abstract

The objective of this work is to develop a realistic control technique for stably regulating the power output of a photovoltaic array. The associated process is referred to as the regulated power point tracking (RPPT). Ideally, the converter duty ratio is expected to be a continuous variable so that the photovoltaic power output can be freely adjusted. However, such a continuous-mode RPPT is possible only with the help of an analogue pulse-width-modulation (PWM) control. In contrast, the modern digital PWM control causes a duty ratio quantisation. As a result, the photovoltaic power output can, practically, be adjusted only at some discrete power levels. Therefore, existing RPPT control techniques, which optimistically assume a continuous power production range, may lead to persistent low-frequency power oscillations because of the digital PWM. To overcome the particular problem, a quantum-mode RPPT control technique is proposed in this paper. The quantum-mode RPPT basically limits its search only to the practically attainable discrete power levels by suitably modifying the given power reference command. Thus, the power tracking can always reach a converged state. For the faster RPPT, the perturbation step size is dynamically adapted. The proposed RPPT control technique is verified via both simulations and hardware experiments.

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IITH Creators:
IITH CreatorsORCiD
Reddy, M. Kranthi KumarUNSPECIFIED
Sarkar, VaskarUNSPECIFIED
Item Type: Article
Uncontrolled Keywords: Continuous variables; Control techniques; Low frequency power; Photovoltaic arrays; Photovoltaic power; Power point tracking; Pulse width modulation control; Reference command
Subjects: Electrical Engineering
Divisions: Department of Electrical Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 17 Jul 2021 07:07
Last Modified: 17 Jul 2021 07:07
URI: http://raiith.iith.ac.in/id/eprint/8393
Publisher URL: http://doi.org/10.1049/rpg2.12143
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