A new method for energy management of residential microgrid for sizing electrical and thermal storage systems

Abstract

This paper proposes a frequency-based energy management scheme (FEMS) for islanded operation of a residential Microgrid (MG) using a Lithium-Ion battery (LIB) energy storage system (LIBESS) and distributed generators (DGs). The LIBESS handles primary frequency control and energy management during peak-load period while the dispatchable DGs supply the base load. Considering that the thermostatically controlled loads (TCLs) make up a major part of MG load profile especially during peak-load period in summer. Unlike TCLs like ACs and EHPs that instantaneously use their generated cooling thermal energy, the Thermal Energy storages (TESs) can also store it and use it later. In this paper the Thermal Energy Storages (TESs) are used instead of TCLs like ACs and EHPs to supply the cooling thermal energy for maintaining the indoor temperatures of residences within comfort limits. The TESs can be charged to provide cooling thermal energy during in islanded operation with insufficient power generation capacity. By doing this, the total energy consumption of MG and the required LIB capacity for energy management decreases considerably. The results shows that with TCLs being totally replaced with TESs, the required LIB capacity is decreased 70 % than the case TCLs are not replaced with TESs.