Enhanced Disturbance with Droop Mechanism for FACTS Based PV System

Enhanced Disturbance with Droop Mechanism for FACTS Based PV System



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    Droop control has commonly been used with distributed generators
    for relating their terminal parameters with power generation. The generators
    have also been assumed to have enough capacities for supplying the required
    power. This is however not always true, especially with renewable sources
    with no or insufficient storage for cushioning climatic changes. In addition,
    most droop-controlled literatures have assumed a single dc-ac inverter with
    its input dc source fixed. Front-end dc-dc converter added to a two-stage
    photovoltaic (PV) system has therefore usually been ignored. To address these
    unresolved issues, an improved droop scheme for a two-stage PV system has
    been developed in the paper. The Proposed scheme uses the STATCOM
    control structure in both grid-connected and islanded modes, which together
    with properly tuned synchronizers, and mitigates the harmonics, by providing
    Reactive power and Load current Subsequently the proposed scheme adapts
    well with internal PV and external grid fluctuations, and is hence more
    precise with its tracking, as compared with the traditional droop scheme.
    Simulation and experimental results are obtained using MATLAB Simulink.
    Keywords: Droop Control, Photovoltaic, STATCOM.
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    Enhanced Disturbance with Droop Mechanism for FACTS Based PV System