RISK ANALYSIS OF ISLANDING OF PHOTOVOLTAIC
POWER SYSTEMS PROTECTION
ABSTRACT
When system frequency starts falling due to overloads or fault, there is a possibility of cascade tripping of turbine-generator units in the entire regional grid and the total National Grid. To avoid this and maintain save the Grid, the Network is Islanded into separate Islands. In majority of power systems, load shedding is automatically performed because the time available is insufficient for manual operation. Frequency relay is frequently utilized for load shedding
The probability of load/generation match conditions being met at any time is a function of the load/generation match criteria. The risks associated with islanding can be reduced if the inverter has the ability to detect a loss of mains supply. The ‘fault tree’ method used to structure the PV risk analysis. The success of the protection system will depend on its correct design and the reliability of its components. The stability of a power island is governed by how long it is able to sustain itself.
