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An Improved MPPT Approach Based on Analytical Inverter Input Impedance Computation for PV Water Heating Systems

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Abstract

An emerging type of photovoltaic (PV) system for which maximum power point tracking (MPPT) algorithms are scarce in the literature is the PV water heating system (PWHS). The application of existing PWHS-specific MPPT algorithms presents a significant difficulty in that none of them is able to provide, concurrently, low-complexity implementations and high tracking efficiencies. This paper addresses such challenge by proposing a novel impedance matching-based MPPT algorithm that has O(1)-complexity iterations and high efficiency for typical PWHS loads. Such efficiency improvement is achieved via generalization of a previous impedance matching algorithm, which is obtained by taking into account the effect of current harmonics into the impedance matching computations. The proposed algorithm is validated by means of simulation experiments, whose results confirm that it yields superior performance when compared to other low-complexity MPPT methods in the PWHS literature.

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Notes

  1. Clearly, if a more traditional algorithm such as P &O is used for carrying out MPPT, the irradiance and temperature sensors should be replaced by voltage and current sensors.

  2. In any case, all derivations carried out in this work can be readily adapted to any modulation scheme with a known ratio between input and output voltages (see Sect. 3.1).

  3. Since only the inverter-load subsystem is simulated in this experiment, a DC input voltage value must be specified; we have thus adopted \(V_o=200\ \textrm{V}\). Identical results shall be obtained for any \(V_o\) which is sufficiently large (as is the case in practice) so that the voltage drop through the MOSFET on-resistance \(r_{on}\) (see Table 2) may be deemed negligible.

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Author notes

  1. Henrique Pires Corrêa and Henrique Teles Vieira have contributed equally to this work.

Authors and Affiliations

  1. School of Electrical, Mechanical and Computer Engineering, Federal University of Goiás, Avenida Universitária 1488, Goiânia, GO, 74605-010, Brazil

    Henrique Pires Corrêa & Flávio Henrique Teles Vieira

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  1. Henrique Pires Corrêa
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  2. Flávio Henrique Teles Vieira
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Correspondence to Henrique Pires Corrêa.

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The authors have no known competing interests to declare. No funding was received. The datasets generated and analyzed are available from the corresponding author on reasonable request.

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Corrêa, H.P., Vieira, F.H.T. An Improved MPPT Approach Based on Analytical Inverter Input Impedance Computation for PV Water Heating Systems. J Control Autom Electr Syst 34, 820–830 (2023). https://doi.org/10.1007/s40313-023-01009-1

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