Embedding Power Line Communication in Photovoltaic Optimizer by Modulating Data in Power Control Loop

Yue Zhu, Jiande Wu, Ruichi Wang, Zhengyu Lin, Xiangning He

    Research output: Contribution to journalArticlepeer-review


    In Photovoltaic (PV) system, dc-dc power optimizer (DCPO) is an option to maximize output power. At the same time, data links among DCPOs are often required for system monitoring and controlling. This paper proposes a novel power line communication (PLC) method for the DCPOs, in which the data of a DCPO is modulated into the control loop of power converter, and then transmitted through the series-connected dc power line to other DCPOs. In the process of communication, differential phase shift keying (DPSK) modulation and discrete Fourier transformation (DFT) demodulation are employed. To analyze the quality of communication, the communication model of the system is built, based on small-signal model. Furthermore, the noises of the system, including switching, maximum power point tracking (MPPT) and additive white Gaussian noise (AWGN), are discussed and measured to evaluate the signal-to-noise ratio (SNR). At last, an experimental system including 6 DCPOs is established and tested, which verifies the feasibility and effectiveness of the proposed method.
    Original languageEnglish
    Pages (from-to)3948-3958
    Number of pages11
    JournalIEEE Transactions on Industrial Electronics
    Issue number5
    Early online date24 May 2018
    Publication statusPublished - May 2019

    Bibliographical note

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    Funding: This work is sponsored by the National Nature Science Foundation
    of China under Grants 51577170, National Key Technologies R&D
    Program of China No. 2017YFE0112400, and the European Union’s Horizon
    2020 research and innovation programme under grant agreement No. 734796.


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