Small signal induction generator model connected in a frequency-droop controlled renewable energy microgrid

The present paper presents the development of the small signal model of an induction generator (IG) connected in a renewable energy microgrid. The induction generator is used in this microgrid to convert biomass and geothermal energy to electrical energy. The control of the microgrid is based on frequency-voltage droop. The prime mover (biogas or geothermal) keeps the speed of the IG rotor constant thus the output power of the IG can be varied by modifying the local grid frequency. As a consequence this paper proposes a small signal model for the IG used in this microgrid. A simulation model is also developed in PSIM to validate the mathematical model.