The Power quality is essential prerequisite of todays required load. Power system has been facing many problems due to variation in loads. Conventional on load tap changer (OLTC) is being used since long time for any momentary changes in load requirement. Conventional tap changers uses mechanical switches for tap changing. Mechanical tap changer has some drawbacks, like they takes more time for operation, arching, mechanical losses, manpower required, continues maintenance. Also sometimes mechanical tap changer get stuck between two taps, which leads to damage of whole system, it affects stability of the system etc. The ceaseless development in utilization of energy using semiconductor gadgets, for example, the TRIAC, Metaloxide-semiconductor field-effect transistor (MOSFET), Insulated gate bi-polar transistor (IGBT) and Gate turn off thyristor (GTO) has helped for the working of OLTC controllers. To eliminate the drawbacks of mechanical tap changer, this paper presents implementation of Automatic Voltage Control on load (AVCL) tap changer for maintaining constant output voltage. The implemented design of AVCL can be suitable in smart grid technology as an advance technology. The designed and fabricated of AVCL system is using tapings on primary side instead of secondary side, which will provides the quick response, no arcing problems, no wear and tear, reduction of losses, safety towards equipment and human beings.
Multiphase motors are induction motors in which stator has more than three phases. These motor drives (more than three phases) have attracted more attention in recent automation as they possess several advantages over conventional threephase drives such as lower space-harmonic content, can operate even during phase open fault, higher torque density, and higher efficiency. For applications operating with electric cars, multiphase system could satisfy potential demand for electric drive systems of power, which are both robust and energy efficient. This paper presents dynamic modeling of five-phase induction motor drive, also simulation results of a five phase induction machine supplied from a five phase inverter.
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