Islanding

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Islanding of inverter-connected PV-generator systems means any situation where the source of power from the network operator’s distribution system is disconnected from the network section in which the generator is connected, and one or more inverters maintain a supply to that section of the distribution system or consumer’s installation. The situation may cause an electrical shock hazard to service personnel operating on the islanding network section while it has been supposedly shut down through separating it from the main power station.

There is discussion in the field about whether islanding is indeed a significant hazard. A study in the Netherlands has suggested that waiting for 60 seconds after disconnecting a network from the main power station should be sufficient time so that statistical power and load fluctutations in the islanding network section will cause shutdown functionality of the PV generators to trip and shut down the network section, thus ending the islanding condition. [1]

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