ISSN: 2277-9655 [Reddy & Rao* et al., 5(12): December, 2016] Impact Factor: 4.116 IC™ Value: 3.00 CODEN: IJESS7 http: // www.ijesrt.com© International Journal of Engineering Sciences & Research Technology [523] IJESRT INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY SIMULATION COMPARISONS OF INDUCTION MOTOR DRIVE WITH ESTIMATOR AND PLL V. Narsi Reddy * , S. Krishnarjuna Rao*, S.Nagendra Kumar * Assistant Professor, Dept. of EEE, Malineni Perumallu Educational Scoety’s Group of Institutions, Guntur, Andhra Pradesh, India Assistant Professor, Dept. of EEE, Universal College of Engineering & Technology, Guntur, Andhra Pradesh, India DOI: 10.5281/zenodo.203959 ABSTRACT This paper proposes a new control scheme for controlling of Induction Machine. In this control mechanism we are comparing the results with different schemes as 1. Rotor angle based speed estimation and 2. Phased lock loop based speed estimation. Then it is preceded with comparison through these two estimation methods. The simulation has been done and results is verified and validated in MATLAB /SIMULINK with different test conditions. KEYWORDS: Induction Motor, PLL, V/f Control. INTRODUCTION The adjustable speed drives (ASD) are used more and more in industrial processes. The widespread industrial use of Induction Motor (IM) has been stimulated over the years by their relative cheapness, low maintenance and high reliability. The control of IM variable speed drives [1] often requires control of machine currents, which is normally achieved by using a voltage source inverter. A large number of control strategies have been registered so far. The volts per hertz (v/f) control of IM drives with inverters are widely used in a number of industrial applications promising not only energy saving, but also improvement in productivity and quality. The low cost applications usually adopt v/f scalar control when no particular performance is required. Variable- speed pumps, fans are the examples. For those applications which require higher dynamic performance than v/f control, the dc motor like control of IM that is called, the Field Oriented Control (FOC) is preferred. During the last few years, a particular interest has been noted on applying speed FOC to high performance applications that is based on estimation of rotor speed by using the machine parameters, instantaneous stator currents and voltages.The benefits of speed sensorless control are the increased reliability of overall system with the removal of mechanical sensors, thereby reducing sensor noise and drift effects as well as cost and size. However to exploit the benefits of sensorless control, the speed estimation methods must achieve robustness against model and parameter uncertainties over a wide speed range. To address this issue, a variety of approaches have been proposed. While all the speed techniques eliminate the use of mechanical speed sensor, they require the stator current and stator voltage signals as input. This requires at-least two current sensors and two voltage sensors on the stator side. It is difficult to get current sensors with equal gains over the wide range of frequencies, voltages and currents used in a practical inverter. The problem is exacerbated if the motor windings are not perfectly balanced or if the current sensors have some dc offset. Over last few years, techniques of stator current reconstruction from the dc link current have been suggested in literature.