International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 07 | July -2017
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p-ISSN: 2395-0072
MODELING AND SIMULATION FOR TRANSFORMER RATIO CONTROLLED SLIP POWER RECOVERY SCHEME Ishan Bhardwaj1, Bhupender Singh2 PG Student, Department of Electrical Engineering, Baddi University of Emerging Sciences & Technology, Baddi,Solan (H.P.), India 2 Assistant Professor, Department of Electrical Engineering, Baddi University of Emerging Sciences & Technology, Baddi, Solan (H.P.), India 1
------------------------------------------------------------------------------***-------------------------------------------------------------------------------Abstract: This research paper mainly focuses on the robustness, low cost, safer, lower operating temperatures simulation of Static Scherbius Drive using transformer and can operate at constant speed even when overloaded. ratio controlled method. Previously there are many Slip ring induction motors on the other hand offer higher methods already for recovery of reactive power which is starting torque with 5 to 9 times inrush current with wide being wasted normally without using a feedback network range of speed control. As all the industrial applications circuit. This is an attempt to find an alternative method for cannot be performed with almost same speed all the time, recovering slip energy with better performance of the that’s why slip ring induction machines found their use in overall circuit. As harmonics are the main concerned here places where variable speed applications were required which offers difficulty for employing this scheme, this such as hoists, elevators, printing presses, large ventilating work aims to get better overall harmonics distortion with fans, etc. better speed control of the rotor through changing the turns ration of the transformer. A method to evaluate harmonic distortion in slip power recovery drives was presented in [1], while taken into Index Terms— PWM inverter, Slip Power Recovery account commutation overlap and dc current ripple. This Scheme and Static Scherbius Drive. method predicted the voltage and current waveforms accurately and computed the individual harmonic components efficiently. In [2], an attempt was made to I. INTRODUCTION1 recover the slip energy to the part of the stator winding to avoid use of recovery transformer. The major problem THERE has been remarkable research innovations in the with this concept was the rotor neutral, must now be field of energy saving as it had become a necessity with the isolated if grounding was assumed at supply transformer widespread of industrial development all around the neutral. world. Induction motors covering the major area of energy In [3], an adaptive fuzzy technique for improving consumption has attracted many researchers for better performance of slip recovery drive was presented. A utilization and management of the energy resources. Many technique for starting of a slip energy recovery induction high performance controlling methods for induction motor drive from standstill position was given in [4]. This motors have been derived and are substantially used in approach used a hybrid model which retained the actual order to get maximum energy benefits. rotor phase variables but transformed those of the stator, A simple and primitive method for induction motor control to examine the starting transients of a slip recovery drive was rheostatic control done mechanically. Although the system. In [5], an analytical technique on the rectifier entire rotor power in this case was wasted but this method output voltage in the slip energy recovery induction motor have advantages of smooth starting, maximum torque with drives was introduced. Since, this technique used hybrid no in-rush current and no harmonics. Instead of wasting dq/abc model, it was found to be a suitable method for this power which is in the form of slip power, it can be harmonic analysis of current waveforms. controlled through a rectifier with power then fed back to [6] proposed the harmonic analysis of the system that the line and eventually improving the overall efficiency of provided significant reduction in the current harmonics the system. This schematic approach is given the name of contents torque which was superimposed on the average slip power recovery scheme. This scheme is mainly used in electromagnetic torque and de-rating of the percentage of wind turbines for producing energy out of wind by machine. The use of the proposed induction machine, harnessing most of its power and converting it to usable resulted in a complicated detailed mathematical model. [7] form. presented a neural network based tracking control system Conventionally induction machines which used are for slip energy recovery drive-in adaptive control, this squirrel cage motors. The reason for this preference is its model could be very complicated especially for the slipenergy recovery system. In [8], the analysis of Static © 2017, IRJET
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