Abstract:
Due to renewable energy output characteristics and system operational constraints,the improvement on the consumption of renewable energy has been a hot issue recently.By introducing the electric boiler,absorption refrigerator and electric compress chiller into the combined cooling,heating and power (CCHP) micro-grid for increasing the consumption of renewable energy and supply part of heating and cooling loads,this paper proposes a model predictive control energy management method,in which a model of CCHP micro-grid satisfying the actual operation constraints is established and the operational characteristics of each unit in the micro-grid are considered.In an intentional island mode,we establish the optimization objective function of energy management by considering the expected capacity value of energy storage devices and operating characteristics of each unit.And then,a finite-horizon optimization problem with logic variables is established by using receding horizon optimization strategy of model predictive control and the forecast result of renewable energy and load power.Finally,simulation results show that the introduction of electric boiler,absorption refrigerator and electric compress chiller can effectively improve the consumption of renewable energy,reduce the consumption of fuel and decrease the operation costs.Besides,the receding horizon optimization strategy can eliminate the effect of the intermittent output of renewable energy and fluctuation of load demand.