ABSTRACT
The power supply and demand have to be balanced to keep the frequency deviation in a small range to avoid damages to electrical facilities, and to balance the power supply and demand with optimized control. Generation companies/authorities use this information to plan how much power they need in the present and future to generate at any certain of time. There is no difference between the load duration curve and a load curve. The load curves defined as the relationship between the power loads. Different models of load are established in a way starting from primary load data and based on the need to find the reliability.
