Nanyang Technological University, Singapore
It is my honor to be the editor-in-chief of IJEETC. The journal publishes good papers which focous on the advanced researches in the field of electrical and electronic engineering & telecommunications.
Abstract—Power is measured in instantaneous quantities, while energy is the integral of power over time.
For example, a 100 W light bulb absorbs 100 W of power. If operated for one hour, that light bulb
absorbs 100 W – hours of energy. Maximum demand is the maximum instantaneous power
consumed over a specified window of time. In the case of that 100 W bulb, as it is switched on and
off, the instantaneous demand goes from zero to 100 W to zero, etc. Not very interesting. But if
that bulb is operated in parallel with a second 100 W light bulb that is left on all the time, the
demand will switch instantaneously between 100 W and 200 W, and the maximum demand of the
combination will be 200 W. Now, the way this is applied is that electric distribution utilities often
include demand as one of the factors used to determine the bill the consumer receives. In addition
to measuring integrated energy consumption over the billing period (typically a month), they also
measure demand. Rather than measure truly instantaneous values, they actually measure energy
over a short window of time, and then divide the energy consumed during that interval by the length
of the interval to arrive at an effective peak value for the interval. This is done because truly
instantaneous measurements can be distorted by common events such as starting a motor (El-
Sayed, 1999). So, for example it is fairly common to see demand referred to as 'fifteen minute
demand' because it is the effective peak value over a fifteen minute window of time. The reason for
measuring and charging for demand is that the distribution utility has to build out its infrastructure
to be able to support the peak consumption by its customers. Measuring and billing for maximum
demand is a way of assessing the degree to which the needs of individual customers are driving
the expansion of the infrastructure that supports all customers (Mostafa et al., 2004).
Index Terms—MDI, Power factor, Penalty, Load management
Cite: Mousam Sharma, Anup Mishra, Nagendra Tripathi and Abhishek Verma, "MICROCONTROLLER BASED MAXIMUM DEMAND INDICATOR AND CONTROLLER FOR EFFICIENT POWER MANAGEMENT," International Journal of Electrical and Electronic Engineering & Telecommunications, Vol. 2, No. 2, pp. 90-98, April 2013.
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