Algorithmic structure of control system of mine winder electric drive with a doubly-fed motor

Abstract

Usage of doubly-fed electric machine is a promising means to modernize asynchronous electric drives of mine winders based on wound rotor induction motor. To ensure a wide range of speed regulation, typical of mine widers, while maintaining the critical torque of the machine and its overload capacity, it is necessary to control amplitude, frequency and phase shift of the auxiliary voltage on the rotor. Since the frequency and phase shift determine the additional voltage argument, and the amplitude determines its modulus, then the speed control by changing the module and the argument is a non-trivial task requiring a special structure of control system of mine winder electric drive, as well as special regulators, and the system is non-linear. This article discusses the construction of a functional structural diagram of electric drive control system based on a doubly-fed motor, which allows the indicated features of controlling the speed of a doubly-fed machine to be taken into account by changing the parameters of the auxiliary voltage on the rotor.