Stability enhancement of a distribution network comprising a fuel cell and a microturbine

The paper demonstrates that distributed generators, namely a fuel cell and a microturbine, could cause instability of electric power distribution systems following fault conditions. A control algorithm is then proposed to enhance transient stability in case of large disturbances. The control algorithm consists of (1) disconnecting the fuel cell during the fault and (2) implementing fixed structure decentralized solid oxide fuel cell reconnection controllers and fixed structure decentralized power system stabilizer for the microturbine generator. The stabilizer parameters are tuned using a Swarm optimization technique.