Fault detection and compensation for a PV system grid tie inverter

The main purpose of this paper is to propose a fault detection and fault tolerant control mechanism to maintain the continuous operation of the grid tied inverter, which is commonly used to interface renewable energy and distributed generation to the grid. The fault tolerance is provided using modified topology of the DC-AC power converter with redundant standby branch. The proposed system insures the continuous operation without isolating the energy source from the grid during faults on inverter switch. The fault may be open circuit fault or short circuit fault.