Rate of Change of Frequency Detection in Microgrid under Stochastic Supply and Load

The frequency variation is detected in a microgrid consisting of wind turbine, solar thermal, fuel cell, diesel generator along with storage devices like battery and flywheels. The frequency changes abruptly because of sudden and stochastic changes in load, solar and wind turbine outputs. The rate of change of frequency (ROCOF) is detected using a relay which is tested both in simulation as well as real-time hardware set up using NVIDIA JETSON NANO and NI DAQ. It is analyzed that the proposed technique detects the change in frequency effectively and generates the required trip signal for the circuit breaker for improvements in the protection strategy in microgrid under various operating scenarios.