Optimal scheduling of a CHP system with energy storage

Microgrid concept has been proven to have a positive impact on the operation of the power system. Distributed generation and energy storage enable control of microgrid power flow which can be optimized for participation in the electricity markets. This paper presents an optimization model for economical scheduling of a microgrid using linear programming. Two microgrid models are taken into account. The microgrid proposed in the first model consists of thermal and electrical loads and a CHP unit. The second model consists of the units considered in the first model with addition of thermal and electrical storage. Optimization results for the two cases are compared to determine the impact of energy storage on an optimal scheduling. Operational costs are calculated for both cases and compared to the benchmark case where thermal energy is supplied from a gas fired boiler and all electricity is acquired from the grid. Additionally, the savings in several cases of energy storage size are compared.