Frequency response of autonomous microgrid based on family-friendly controllable loads

Abstract

Frequency is a key issue for the stable operation of autonomous microgrid (AMG) with a large penetration of intermittent renewable energy resources. The fast development of demand-side response technology provides a new solution for the frequency control of the AMG. In this paper, a novel decentralized demand control strategy (DDC) for family-friendly controllable refrigerators considering customer comfort level is proposed to regulate the frequency of AMG in coordination with the energy storage system (ESS). The refrigerator under DDC responds to the local frequency signals quickly and adjusts its operation cycle dynamically. Meanwhile, a customer participation degree which is proportional to the frequency deviation is introduced to evaluate the customer comforts when responding to the frequency of AMG. Finally, a benchmark low voltage AMG is established as a test system to verify the effectiveness of the proposed DDC strategy. Simulation results show that the DDC strategy can not only improve the frequency control effect of AMG effectively but also guarantee the customer comforts as well as reduce the capacity of ESS.