A Novel DC-Bus Sensor-less MPPT Technique for Single-Stage PV Grid-Connected Inverters

Mohamed A. Elsaharty, Hamdy A. Ashour, Elyas Rakhshani, Edris Pouresmaeil and João P. S. Catalão
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Mohamed A. Elsaharty: Department of Electrical and Control Engineering, College of Engineering and Technology, Arab Academy for Science, Technology & Maritime Transport, Alexandria 1029, Egypt
Hamdy A. Ashour: Department of Electrical and Control Engineering, College of Engineering and Technology, Arab Academy for Science, Technology & Maritime Transport, Alexandria 1029, Egypt
Elyas Rakhshani: Electrical Engineering Department, Technical University of Catalonia (UPC), Barcelona 08034, Spain
Edris Pouresmaeil: University of Beira Interior, R. Fonte do Lameiro, 6201-001 Covilhã, Portugal
João P. S. Catalão: University of Beira Interior, R. Fonte do Lameiro, 6201-001 Covilhã, Portugal

Energies, 2016, vol. 9, issue 4, 1-23

Abstract: Single-stage grid connected inverters are considered as an economic, compact and simple topology compared with multi-stage inverters. In photovoltaic (PV) grid connected systems, the major requirement is to achieve maximum output power from the source. Maximum Power Point Tracking (MPPT) techniques require measurements on the DC side of the inverter connected to the PV in order to determine the current operating point on the power characteristics. Typically this is achieved by perturbing the reference output power and observe the change in the PV voltage, current or both. Based on the observation, it could be determined whether the current operating point is beyond or below maximum power. This paper presents an MPPT technique for a single-stage PV grid connected inverter where the MPPT algorithm determines the current operating point at different operating conditions based upon observing the inverter controller action. Such approach eliminates the requirement of sensing elements to be added to the converter which aids the advantages of the single-stage converter. Design of the utilized PV system is derived based on filter parameters, PV panel selection and controller parameters. Using simulation and practical implementation, the performance of the proposed MPPT technique is evaluated for the PV grid connected system.

Keywords: single-stage converter; MPPT technique; sensor-less; photovoltaic; grid connected (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2016
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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