Abstract
In this paper, an optimal energy management strategy for a cooperative multi-microgrid system with combined cooling, heat and power (CCHP) is proposed and has been verified for a test case of building microgrids (BMGs). Three different demand types of buildings are considered and the BMGs are assumed to be equipped with their own combined heat and power (CHP) generators. In addition, the BMGs are also connected to an external energy network (EEN), which contains a large CHP, an adsorption chiller (ADC), a thermal storage tank, and an electric heat pump (EHP). By trading the excess electricity and heat energy with the utility grid and EEN, each BMG can fulfill its energy demands. Seasonal energy demand variations have been evaluated by selecting a representative day for the two extreme seasons (summer and winter) of the year, among the real profiles of year-round data on electricity, heating, and cooling usage of all the three selected buildings. Especially, the thermal energy management aspect is emphasized where, bi-lateral heat trading between the energy supplier and the consumers, so-called energy prosumer concept, has been realized. An optimization model based on mixed integer linear programming has been developed for minimizing the daily operation cost of the EEN while fulfilling the energy demands of the BMGs. Simulation results have demonstrated the effectiveness of the proposed strategy.
Highlights
Microgrid penetration has increased at medium and low voltage levels in developed/developing countries worldwide
Various types of distributed generators along with small-scale combined heat and power (CHP) and combined cooling, heat and power (CCHP) equipment are used for district heating and/or cooling
electric heat pump (EHP), adsorption chiller (ADC), large CHP, and thermal storage tank are assumed to be owned by a single stakeholder, which is named as energy network (EEN) in this paper
Summary
Microgrid penetration has increased at medium and low voltage levels in developed/developing countries worldwide. A mathematical model based on mixed integer linear programming has been formulated for managing all the three forms of energies for BMGs in the proposed building multi-microgrid system. The proposed building multi-microgrid system comprises of three different demand types of buildings with their own local CHP generations: BMGs, and an external energy network (EEN) having a large CHP, adsorption chiller (ADC), thermal storage tank, and electric heat pump (EHP). The objective of the developed model is to minimize the operation cost of EEN while fulfilling the CCHP needs of BMGs in the building multi-microgrids system This will result in bi-lateral heat trading between the conventional energy supplier and the consumers resulting in the involvement of energy prosumer stakeholders. All the formulations are based on mixed integer linear programming, which are easy to implement
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