Basic study on interaction between synchronous machine and islanding detection method of power conditioning system

The interaction between synchronous generator and islanding detection of power conditioning system (PCS) for distributed generation, especially bases on positive frequency feedback by reactive power injection, is focused in this paper. When PCS using frequency-feedback islanding detection system are installed to power system intensively, PCSs are afraid to deteriorate the frequency stability. This research focuses on small islanding system such as microgrid, including a synchronous generator and a PCS. In a microgrid which is operated in islanding mode, its frequency stability may be sensitive to islanding detection system compared with a large scale grid. From the simulations using different automatic voltage regulator (AVR) and governor of the synchronous generator, it is found that there is a possibility of continuous frequency fluctuation caused by the interaction between AVR and islanding detection system. In addition, maximum tolerable capacity of PCS in the system used in this research is presented.