Joint energy management and trading among renewable integrated microgrids for combined cooling, heating, and power systems

Abstract

Energy depletion and rising demand cause a demand-supply imbalance and power system instability. Centralized energy production makes the system less reliable and less efficient because of problems with transmission and line losses. Conventional microgrids use electricity to heat, cool, and power loads, wasting microturbine surplus heat. To address these issues, a joint energy management and trading model for combined cooling, heating, and power (CCHP) microgrids is proposed to minimize the system cost as well as enhance the system’s efficiency and reliability. The framework is designed in such a way that, in the first step, each CCHP microgrid will apply demand-side management to meet its load demands from its own generation. If any CCHP microgrid does not have enough self-generated energy to meet its load demands, then it can purchase energy from nearby CCHP microgrids or utility. On the other hand, each CCHP microgrid has the option to sell any extra energy to nearby CCHP microgrids or utility. Furthermore, each CCHP microgrid can use a diesel generator to meet its energy demands if the available energy from its own generation and energy purchased from other CCHP microgrids or utilities is not enough. To solve the problem of integer linear programming, the branch, and bound algorithm is used. The results show a reduction in the system’s overall cost by 33.29% whereas peak energy demand is reduced by 25.76%. Reduction in peak energy demand will minimize the line losses, and hence the system efficiency and reliability will be improved.