Issues on load shedding in a microgrid operated at constant frequency

This paper presents a method to shed off the least important loads in a microgrid operated at constant frequency under the contingency of inadequate power generation. Different from conventional frequency deviation based load shedding, this paper discusses in detail how to shed off load based on the voltage deviation. The key issue is to differentiate whether the voltage deviation is due to sudden change of loadings and renewable generation or due to insufficient power generation. By setting proper time margin, an error-free judgement could be made to shed off the least important loads.