Summary Photovoltaic (PV) systems are expected to grow on the distribution networks in the future. Under the current regulatory frameworks, islanding operation of PV systems is not permissible because the frequency and voltage of the islanded networks are not regulated and maintained within the statutory limits during islanding operation. Consequently, PV systems must be disconnected immediately in the event of the grid outage as per Malaysian Standards, MS 1873. However, it is proven that the islanded operation of PV systems would enable the owners to consume the available solar energy and help the utility company improve the reliability of electricity supply. To enable the islanded operation of PV systems, a fuzzy‐based controller is developed to drive the operation of the energy storage system to maintain the frequency and voltage within the tolerances during the transition from grid‐connected to islanded operation. Several experimental case studies are performed to show that the fuzzy‐based controller is able to maintain the frequency and voltage within the statutory limits before the islanded networks are reconnected to the grid. It is also shown that the fuzzy controller performs more effective than the proportional‐integrator controller.

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