Volume 22, No. 01, Month MARCH, Year 2022, Pages 25 - 34

Islanding operation among solar hybrid system and grid-tied pv system in buildings

Piyadanai Pachanapan, Phisut Apichayakul, Akaraphunt Vongkunghae, Sarintip Tantanee

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The solar hybrid system which consists of photovoltaic (PV) and battery storage can provide electricity supply to the buildings both on-grid and off-grid conditions. To improve the uninterrupted operation, it is possible to integrate the grid-tied PV system, without the battery, with the solar hybrid system to enhance the power generation during islanding condition. However, many hybrid on/off grid inverters do not allow the other energy sources to charge the battery in the off-grid mode. A particular power curtailment control is then required for the grid-tied inverter to prevent the excessive power. In this work, the power curtailment controller with the combination of smart meter and solar irradiance sensor is introduced. The set-point of grid-tied inverter is automatically adjusted following the changes of load consumption and PV power. The performance of islanding operation among solar hybrid and grid-tied PV systems is examined based on a time-sweep power flow calculation on DIgSILENT PowerFactory software. It is shown that instead of using solar hybrid system alone, coupling with the grid-tied PV system can help increasing the efficiency of battery usage. Hence, this can extend the continued electricity supply to the building during the loss of grid voltage.


Grid-tied inverter, Hybrid inverter, Islanding operation, Power curtailment, Solar hybrid system


Published by : Asian Institute of Technology
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