Thyristor voltage regulator with an adaptive integration control system for smooth start of asynchronous motors

The principle of constructing, structure and basic characteristics of the thyristor voltage regulator (ТVR)with an adaptive integration control system for smooth start of asynchronous motors and power semiconductor«thyristor-diode» are considered. ТVR is intended for operation at a high level of external noises including commutative distоrtions of a mains as well as at amplitude and frequency instability of industrial network thatallows to use TVR on objects with a «problem» mains. High noise stability and the adaptive properties of a system are reached by means of integrating scanning converters with pulse-frequency-width modulation working in an operating mode of external synchronization with frequency of supply-line voltage.The technical and economic results of reconstruction of asynchronous electric drives for industrial plantsusing TVR at Chelyabinsk pipe-rolling plant are given. The economic effect from implantation of the equipment has made over 6.9 million rubles per year and is obtained due to saving the electric power at conversion of asynchronous electric drives in an intermittent cycle and cutting down expenses on maintenance and service of a power electric equipment of technological installations.