Strategies to prevent overvoltage-induced inverter disconnections

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From pv magazine International

Scientists at the University of South Australia have identified a series of strategies that can be implemented to prevent solar power losses when overvoltage-induced inverter disconnections occur, due to voltage limit violations.

The research group said on-load tap changers (OLTC) and shunt reactors – two conventional technologies that are used to address the overvoltage issue – are not particularly effective for PV induced overvoltages, due to the intermittent nature of solar power itself. OLTCs are used to regulate power transformers in electrical energy networks and industrial applications, by enabling voltage regulation and phase shifting by varying the transformer ratio under load without interruption. Shunt reactors are applied to high-voltage power networks to stabilize the voltage during load variations.

Seven more technologies can be used in conjunction with the existing solutions.

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