Induction motor for many years has been regarded as the workhorse in industrial applications. An induction motor can run only at its rated speed when it is connected directly to the main supply. However many application need variable speed operations. With the invention of variable voltage variable frequency drives (VVVF), the use of an induction motor has increased. Variable voltage variable frequency control provides a simple and cost efficient method for open-loop speed control of three phase induction motor. This technique is popularly known as V/f control. In this paper principle and operation of V/f drive is summarized. This paper include experimental results of Voltage, Current and Speed on different frequencies which shows that induction motor speed is vary according to frequency input and simultaneously supply voltage is controlled to maintain V/f ratio constant.
The concept of shaping domestic and commercial loads can be an effective way of controlling the load profile of a distribution company. Flat energy rates don’t provide incentives to customers to use power as would be optimal from a utility point of view. Price of energy should be fluctuating according to peak or off peak load condition. Smart meters can offer solution to this by allowing sophisticated measurement of
consumption and using real time pricing (RTP) signals sent by utility. The consumer can minimize their expenses on energy by adjusting their intelligent appliances operation. Home Energy Controllers (HEC) control appliances at domestic and commercial consumer’s premises to save energy, reduce cost, increase reliability, efficiency and transparency. In this paper different automated meter reading (AMR) technologies and
architecture of smart meter are discussed. Appliance scheduling approach is realized here with help of MATLAB simulation to keep the peak power demand for the homes below target value and reduce the cost of energy
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