Rural areas are either weakly connected to grid or
have no grid access. Therefore, hybrid system is only solution for
continuous undisrupted power supply. Also these rural
microgrids have specific types of load. Small systems are more
vulnerable to load disturbances and therefore, frequency and
voltage variation have post disturbance effect on the system
stability. Four different types of loads having exponential voltage
and frequency characteristics are considered for the study. EPRI
Load modeling has been considered based on aggregate index
calculation. The system is studied for step increase/decrease in
load as well as input power to the wind energy system and also
the post effect of voltage & frequency change on the load with its
influence on the system is considered for study purpose. The
isolated microgrid proposed has wind energy system with PMSG
and biogas genset (BG) with synchronous generator (SG). The
system is designed in such a way that any increase/decrease in
load and input power to wind is taken up by the biogas system.
No additional reactive power compensator is envisaged.
Accordingly, the controllers are tuned using Integral Square
Error criterion for mitigate variation in load voltage &
frequency.
Small Scale Stability of Isolated Rural Microgrid Based on Load Characteristics
