Improving the Frequency response of a Microgrid using an Auxiliary Signal in the AGC Loop*

This paper improves the frequency response of a microgrid by including an additional signal in the AGC loop. The system frequency is an indication of the power balance between the generation and the load, moment to moment. The generators employ Automatic Generation Control (AGC) to regulate the power generated to keep the frequency as required. Considering the standard IEEE 15, 33 and 69 bus distribution systems as Microgrid, the proposed control logic is tested for its performance against the existing governor control. The additional signal chosen is the power mismatch after the load change and it is used to modify the generator mechanical input given by the existing governor control. The proposed method is compared against the existing governor control. In this paper, the power source considered is bio-diesel powered synchronous generators. In the upcoming de-regulated energy environment, if the generators acts as frequency response reserves-the system performance as well as the monetary benefits for the generators will improve.