2017 Volume 30 Issue 4 Pages 143-152
Surplus power generated by large number of photovoltaics (PV) systems which are penetrating to general households is concerned as great impact to grid systems. This paper proposes a home energy management system (HEMS) which simultaneously controls charge/discharge of an in-vehicle battery of electric vehicle (EV) and operates heat pump water heating (HPWH). The proposed control is model predictive control manner in which the profiles of in-vehicle battery charge/discharge and HPWH operation are calculated iteratively in each step, minimizing the electricity bill with considering both the reverse surplus power as penalty and the vehicle usage as constraint. Especially,a piece-wise linear model of HPWH is introduced into the optimization problem in order to realize realistic computational time. As the result, both suppressing the surplus power reversing to the grid and decreasing electricity bill of the residents are realized. The effectivity of proposed system is verified by a simulation utilizing real data of a household.