A new approach in MPPT for photovoltaic array based on Extremum Seeking Control under uniform and non-uniform irradiances |
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| Affiliation: | 1. Department of Electrical and Computer Engineering, University of Semnan, 19111-3513 Semnan, Iran;2. Department of Electrical Engineering, Mashhad Branch, Islamic Azad University, Mashhad, Iran;3. Department of Electrical and Robotic Engineering, Garmsar Branch, Islamic Azad University of Iran, Garmsar, Iran;1. Intelligent Fusion Technology, Inc., Germantown, MD, 20876, USA;2. Department of Electrical Engineering and Computer Science, University of Central Florida, Orlando, FL, 32816, USA;3. School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA;1. Department of Chemical Engineering, Queen’s University, Kingston, ON, Canada;2. Université Catholique de Louvain, ICTEAM, Louvain-la-Neuve, Belgium;1. African Railway Centre of Excellence, Addis Ababa Institute of Technology, Addis Ababa, Ethiopia;2. Electrical and Computer Engineering, Addis Ababa Institute of Technology, Addis Ababa, Ethiopia;1. Joint Doctoral Program (Aerospace and Mechanical) Between San Diego State University and University of California, San Diego, La Jolla, CA 92093-0411, USA;2. Department of Electrical and Computer Engineering, San Diego State University, San Diego, CA 92182-1309, USA;3. Department of Mechanical and Aerospace Engineering, University of California, San Diego, La Jolla, CA 92093-0411, USA |
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| Abstract: | This work presents a Maximum Power Point Tracking (MPPT) based on analyzing the output characteristics of PV array under uniform irradiance and partial shading conditions. In order to carry out MPPT in PV panels, under partial shading conditions a method based on Extremum Seeking Control (ESC) is introduced. In contrast with classic ESC, in this method the double of dithering signal frequency is not used, consequently PV output power has a ripple of a lower frequency. Also the drop which occurs when MPPT system starts to operate in classic ESC method is minimized in this paper. The ESC approach for MPPT in this paper uses a series combination of a Low Pass Filter (LPF) and a High Pass Filter (HPF). These two filters act as a Band Pass Filter (BPF) and let a specific frequency of input power which includes the derivative of PV with respect to its voltage pass through. Finally, the system does not operate in local optimal points for efficient point will be global. The algorithm adds partial shadow judging conditions in ESC method. The system runs the variable step ESC method to realize MPPT when photovoltaic array is under uniform irradiance. Under Partial Shading Condition (PSC), the control method can eliminate the interference of local maximum power point (MPP) to make 23 the PV array running at global MPP. In addition, unlike other methods, the proposed MPPT operates on the global MPPs. The proposed MPP tracker does not add any extra complexity compared to the classical ones. However, it increases significantly the efficiency of the PV installation under PSC. We will show that under uniform irradiance, the proposed MPPT leads to faster performances than classical approaches. |
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| Keywords: | Boost converter Extremum Seeking Control Maximum Power Point Tracking (MPPT) Partial Shading Conditions (PSCs) Photovoltaic (PV) system |
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