Islanding issues associated with photovoltaic inverters

One of the main barriers for the proliferation of photovoltaic (PV) systems in power distribution networks is the concern over possible islanding, i.e., when a disconnected part of the power network remains energized by the connected PV systems for a significant time interval. Islanding is undesirable for a number of reasons including safety hazards to utility personnel; and potential damage to equipment. Numerous anti-islanding techniques have been proposed and implemented in present-day grid-tie inverters. This thesis reviews some of the pros and cons of different anti-islanding techniques, and offers a solution to the Multiple Inverter Islanding Issue and also presents some experimental results conducted on two local grid-tie inverters.