Robust Observer-Based Sliding Mode Control for Maximum Power Point Tracking
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Robust Observer-Based Sliding Mode Control for Maximum Power Point Tracking Amruta S. Deshpande1
· S. L. Patil1
Received: 17 July 2019 / Revised: 16 March 2020 / Accepted: 3 June 2020 © Brazilian Society for Automatics–SBA 2020
Abstract This paper presents a new observer-based maximum power point tracking technique (MPPT) for the solar panel system. Apart from fulfilling the main objective of MPPT, it is designed to accomplish the task without having the measure solar panel output voltage and with a chatter-free control. The proposed control strategy employs a disturbance observer to do away with the need to sense solar panel output voltage and also to ensure insensitivity of uncertainties. A special state observer enables operating the system even when the converter output voltage is initially zero. The performance of the algorithm is assessed for robustness towards the parasitics and uncertainties. The scheme is validated by simulation as well as experimentation in the laboratory. Keywords Photovoltaic cell · Maximum power point tracking · Sliding mode control · Disturbance observer
1 Introduction The optimum utilization of sustainable energy helps to reduce the global level energy crisis. The solar energy is one of the clean energies and spreads across the world free of cost. The drawback of the solar panel is the very low conversion efficiency, as it depends on several factors such as irradiance, environmental temperature, dirt, loading condition and solar panel type. The improvement in the efficiency of the solar panel is possible at the manufacturing stage and conversion stage. In the conversion stage, the suitable converter topology helps to improve the efficiency with maximum power point tracking (MPPT) algorithm. These algorithms help to extract maximum energy from the solar panel in the presence of changing environmental conditions. The various types of dc– dc converter optimize the match between the solar panel and load. The boost converter is one of the preferred converters in photovoltaic (PV) application because of its higher efficiency and operation under continuous conduction mode helps to
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Amruta S. Deshpande [email protected] S. L. Patil [email protected]
1
Department of Instrumentation and Control, College of Engineering Pune, Pune, India
extract maximum energy from the solar cell (Glasner and Appelbaum 1996). In the MPPT literature, algorithms, viz. perturb and observe (P&O) (Femia et al. 2005) and incremental conductance (IC) (Lin et al. 2011), are popular on account of the simplicity of their architecture and ease of implementation. The main drawbacks of the P&O and IC algorithms are continued oscillations and requirement of sensors for current and voltage. The drawbacks can be removed by improving the existing algorithm (Yong and Huiqing 2019; Abdel-Salam et al. 2018; Rezaei 2019). The algorithms like ripple correlation control (RCC) (Esram et al. 2006) and extremum seeking control (ESC) (Heydari-doostabad et al. 2013) are well suited for low-cost application, but these algo
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