International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 03 | Mar -2017
p-ISSN: 2395-0072
www.irjet.net
Industrial Power Control by Integral Cycle Switching Without Generating Harmonics Dharmesh K. Gohil1, Nidhi S. Kami2, Hiral H. Hadiya3, Vishal N. Jogidas4 1, 2, 3 1, 2, 3,4Department
U. G. Student, 4Assistant Professor
of Electrical Engineering, Dr. Subhash Technical Campus, Junagadh, Gujarat, INDIA
---------------------------------------------------------------------***--------------------------------------------------------------Abstract – This paper present integral cycle switching control for industrial power control. In this method voltage control is achieved by connecting load to source for some – on cycle and then disconnecting some load for off-cycle.Principle of operation and circuit description are presented in this paper. The result are simulated using MATLAB SIMULING Integral Cycle control introduces less harmonica into the supply system Key Words: Integral Cycle Control, Harmonics, Welding, high power factor, single phase induction motor, Control Strategies, MATLAB Simulation and Heating Application. 1. INTRODUCTION AC voltage controller is a power electronic circuit in which fixed ac is converted to variable ac without changing the frequency. The converter circuit consists of SCR as switches and provides variable ac to the load. Speed control of induction motor, Industrial heating and lighting, on load tap changing transformers, soft start of induction motors, ac magnet controls, etc. The most commonly used power electronic circuit for controlling the ac voltage is using two SCR’s connected in anti-parallel between source and load. The control strategy depends upon the gate pulse given to the SCR’s [1]. We induction motor controller for reducing harmonics for controlling ATmega8 pin to provide fast and reliable control operations. The controller also includes 28 digital input/output pins. This has wide applications in manufacturing, light dimmer, induction motor speed controlling etc. Vo = V [1/ π {(π – α) – 1/ 2 sin 2 α}] 1/2 P F = Vo / V where input supply voltage v(t) = Vm sin ωt; Vm and V are maximum and rms values of the supply voltage and α is the switching angle of the circuit.Where I is the fundamental value of the line or input supply current and Ii are represents the harmonic current components of I. When α varies between 60 and 120, the supply voltage is close to its Peak value (86.7% to 100%) and the corresponding voltage control range is from 44.2% to 89.7%. At the switching instant (ω t = α), the line current jumps from zero to almost its peak value. Thus, di /dt is high over a wide range of control. Moreover, there is heavy inrush current when furnace element R is heated from cold. At a higher value of α, PF is also low and THD is significantly high [2].
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