Study on Application Usage Scheduling considering Usage Pattern in HEMS

In HEMS, a residential power consumer can use power efficiently and participate the demand response according to an electricity price or other conditions. An optimal usage scheduling for appliances is the main function of HEMS, which generally attempts to minimize the expense on power consumption. However, user’s convenience should be considered in determining when an appliance is used, or how much power is consumed. User’s convenience is related with the usage pattern, and this paper introduce a methodology for modelling the usage pattern using copula function. From cumulative data for the appliance usage, a dependence between the appliance usage and factors affecting the usage is represented by copula function. By copula function with the dependence, a usage pattern for the next day is obtained. And, the modelled pattern is reflected to a scheduling problem as the constraint. In order to explain the methodology and its application, as an example, modelling the pattern and scheduling for an electric heater are carried out.