Optimal soft starting of voltage-controller-fed IM drive based on voltage across thyristor

Abstract

AC voltage controllers are used as induction motor starters in fan or pump drives and the crane hoist drives. This paper presents a method of identifying the end of soft start of an ac voltage-controller-fed induction motor (IM) drive based on the voltage across the nonconducting thyristor through a dynamic simulation of the whole drive system. A two point current minimization technique is adopted to operate the drive system at the required optimal voltage under all operating conditions. This minimizes the motor losses. Graphic modeling of the whole drive system is done in a modular format using Design Star and dynamic simulation is done using SABER. The dynamic simulation results of the whole drive system are supported with experimental data.

Adaptive Neuro Fuzzy based soft starting of voltage-controlled induction motor drive

“…In this method, speed sensor is required to acquire the signal feedback. Some researchers have proposed and developed a method of optimal soft starting without a speed sensor in which sensing of thyristors voltages is very much required [6] [7]. Moreover, sensing of voltage across thyristors is also not required.…”

The Design of Soft Starter for AC Motors Based on Single Neuron PI Regulator

“…Among these, thyristorized soft-starters that apply reduced voltage to the motor are cheap, simple, and reliable [1].This paper proposes a new type of soft starter for AC motors based on micro processor. Adopting three pairs of back-to-back-connected thyristors as the main control circuit, the soft starter has flexible and simple control mode, small concussion to the system, energy conservation control mode and multiple protection.…”

“…Adopting three pairs of back-to-back-connected thyristors as the main control circuit, the soft starter has flexible and simple control mode, small concussion to the system, energy conservation control mode and multiple protection. By use of them the starting current surge can be reduced remarkably and many advantages such as smooth acceleration, ease in implementation of current control, and energy savings with a light load can be available [1][2].…”

“…Some methods of closed loop control of ac voltage regulators have been developed and applied, which requires a speed sensor [4]. In [5] and [1], the authors have proposed a method of optimal soft starting without a speed sensor but it requires sensing of the thyristors voltages.…”

Soft and fast starting induction motors using controllable resistive type fault current limiter

“…Many methods are used to soft startup of IMs, especially in case of big motors in literature and also those compared each other [6][7][8][9][10][11][12][13].…”