A Center Point Iteration MPPT Method With Application on the Frequency-Modulated LLC Microinverter

    Authors

    Q. Zhang; C. S. Hu; L. Chen; A. Amirahmadi; N. Kutkut; Z. J. Shen;I. Batarseh

    Comments

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    Abbreviated Journal Title

    IEEE Trans. Power Electron.

    Keywords

    LLC converter; maximum power point tracking (MPPT); zero-voltage; switching (ZVS); SYSTEM; CONVERTER; TRACKING; Engineering, Electrical & Electronic

    Abstract

    Maximum power point tracking (MPPT) is an essential technique to harvest PV power under varying environments. Perturb and observe (P&O) algorithms are the most broadly used MPPT due to their effectiveness and simplicity. However, it is difficult to balance the tracking speed and oscillation requirements in the conventional P&O with fixed perturb. Adaptive P&O techniques have been proposed as a solution to these problems. However, they are based on duty cycle modulation for conventional pulse width modulation converters. None of them deal with the variable frequency modulation for resonant converters. In this paper, a center point iteration MPPT is proposed, with its variable perturb in frequency. The proposed scheme overcomes the drawbacks of conventional P&O with a simple calculation. Moreover, it is suitable for various power curves, especially the LLC microinverter power curves, which may confuse conventional MPPT algorithms. The effectiveness of the proposed MPPT method was verified in theory. A 300 W prototype was constructed, and the experimental results verified the effectiveness of the proposed center point iteration MPPT. An advanced version was also introduced in order to accelerate the tracking speed.

    Journal Title

    Ieee Transactions on Power Electronics

    Volume

    29

    Issue/Number

    3

    Publication Date

    1-1-2014

    Document Type

    Article

    Language

    English

    First Page

    1262

    Last Page

    1274

    WOS Identifier

    WOS:000328507700022

    ISSN

    0885-8993

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