Voltage control technique for stable operation of SCIM using direct-quadrature transformation

In recent years squirrel cage induction motor (SCIM) appears to be very cost-effective and energy efficient if combined with advanced power electronic inverters. Many industrial problem solutions related with varying speed applications recognized them due to their catchy characteristics like manageable speed-torque, reasonable performance, operational control and satisfactory efficiency etc. The major problems associated with pulse width modulation inverter (PWM) based SCIM are internal and external sourced bearing currents, harmonic productions and fast switching inverter action. This paper presents mathematical modelling based on direct-quadrature transformations of three phase sinusoidal PWM inverter fed SCIM. Direct control of voltage has been analyzed in latest Matlab environment using dynamic simulation technique. Dynamic simulation tool is not only beneficial in verifying the design steps of motor driven system but also reduction of fault can be achieved in construction and testing of prototypes. Issue of noise creates instability throughout the system which is reduced in the designed model by input voltage control. The simulated model shows encouraging output with reduced harmonic content. Early fault detection is possible to avoid the catastrophic conditions of motor which surely goes in economic benefit of industries. This piece of work may be useful for other circuits based on induction phenomenon and results can also be referred for wound machine applications.