Analysis of frequency stability in a residential autonomous microgrid based on a wind turbine and a Microhydro power plant

This paper focuses on the analysis of frequency stability in an autonomous microgrid (MG) with renewable energy sources (RES), mainly wind power. Frequency control is directly related to the active power balance in the system. When RES are involved the generated active power is difficult to predict, and may have fluctuations mainly in the case of wind power plants. Therefore, the autonomous MGs have to be able to manage fast the active power flow, even when the generated power is less than the loads demand. This paper investigates a new control solution for maintaining the frequency stability in the MG, by using a combination of an energy storage system and a dump load. The solution is evaluated by experimental results.