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Due to deregulation and the use of renewable power, especially solar power, the proportion of PV system is rapidly increasing and most of them are connected to distribution networks to supply power to the grid as well as local loads. There are many power quality issues to be considered with PV systems and one of the main issues is islanding. It is important to estimate and detect an islanding situation...
Accompanying the fast development of DG system and more DGs connecting to the distribution system, some new problems appear in protection technique area about grid-connected DG system, among which islanding is a typical and major one. Unplanned islanding will bring many problems to the grid: It threatens the life safety of power line maintaining staff and consumers; influence normal operation of equipment...
The penetration of distributed generation (DG) in electrical power systems is rapidly increasing these days and more attention is drawn to maintaining a healthy distribution system. Islanding operation of DG is one of the biggest challenges. When Islanding occurs, the power supply from the main grid is interrupted which may cause a problem when distributed generators keep providing power into the...
An islanding situation should be detected accurately soon after the island is formed. Because failure to trip the islanded distributed resource can lead to a number of problems for the resource and the connected load. Therefore, it is important to distinguish islanding and non-islanding situations and block the nuisance tripping effectively. This paper compares two islanding detection methods, during...
Islanding detection and anti-islanding protection is one of the most main protection requirements of grid connected wind turbines. This paper investigated a new islanding detection algorithm for wind turbine, which is combining the ROCOF relays and the Total Harmonic Distortion (THD) of wind turbines phase currents algorithms. The THD of wind turbines phase currents method is introduced as interlock...
In this paper, a new Prony's method for frequency estimation is investigated to calculate df/dt. for the rate of change of frequency (ROCOF) protection technique. This algorithm provides accurate and fast frequency calculation for fault detection. System with noise and non-linear load are added during simulation to provide a system similar to real. During non-islanding situation (load adding or adding),...
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