Advanced frequency support strategy of photovoltaic system considering changing working conditions

Xue Lyu, Xu Zhao, Jian Zhao, Kit Po Wong

    Research output: Contribution to journalArticle

    21 Citations (Scopus)


    A novel system frequency support strategy is proposed for the two-stage three phase photovoltaic generation system, which involves simultaneously utilising a direct current (DC)-link capacitor and deloading generation output. When frequency variation is detected, the energy stored in an inverter DC-link capacitor is utilised to enable virtual inertia characteristic for system frequency support. At the same time, a deloading control strategy is also activated to provide system frequency support based on reserved generation beforehand. To address impacts due to the changing working conditions with respect to irradiance and ambient temperature, a variable droop scheme is designed for dynamically adjusting the frequency regulation ability based on deloading. Case studies using a microgrid system embedded with a solar and diesel generator are carried out to verify the effectiveness of the proposed control strategy.

    Original languageEnglish
    Pages (from-to)363-370
    Number of pages8
    JournalIET Generation, Transmission and Distribution
    Issue number2
    Publication statusPublished - 30 Jan 2018

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