D planning D strategy EnergyPlus Gaussian process regression HOMER IEC 61499 IEC 61850 K-modes clustering Korean Time Use Survey MILP R&amp STEEP analysis Smart Grid Station T1-995 TA1-2040 ToU tariff active distribution networks combined dispatch (CD) strategy comprehensive evaluation cyberattacks daily consumption curve data mining development demand differentiation distributed energy management algorithm distributed generation economic feasibility analysis electric vehicle charging technology electrical distribution system electricity charge discount program