Wide-area measurement system-based online calculation method of PV systems de-loaded margin for frequency regulation in isolated power systems

This study proposes a photovoltaic (PV) systems de-loaded margin online calculation method that allows PVs to participate in isolated power system frequency regulation with a proper de-loaded margin. The de-loaded margin determines PVs' frequency regulation capacity. The larger de-loaded margin of PVs provides more reserve capacity for frequency regulation, while more economic benefits are sacrificed correspondingly. Therefore, a tradeoff between PVs' economic benefit and their frequency regulation reserve capacity is necessary. Taking into account these two factors, a dynamic calculation method of PVs optimal de-loaded margin based on the systems real-time operation condition is proposed. Real-time monitoring of the systems operation condition is realised by wide-area measurement system. The calculated de-loaded margin can meet the system frequency regulation requirement with PVs' minimum economic loss. RTDS simulation is conducted in an actual industrial isolated system driven by thermal power and PVs to verify the effectiveness of the proposed method.

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