Drive system for unit parallel shunting at side of wound rotor motor operating in two quadrants

Abstract

The invention relates to a drive system for unit parallel shunting at the side of a wound rotor motor operating in two quadrants, and particularly to a frequency conversion control device for double regulation of the excitation of a stator and a rotor which operate in two quadrants and are connected in parallel by a unit at a wound motor rotor side. The frequency conversion control device is connected to a lead-out end line of the wound rotor motor, and is directly supplied with power by the power grid voltage or other three-phase power. The frequency conversion control system comprises: a rectifier circuit used for rectifying an AC power of a power grid or other voltage sources into a DC power; an inverter circuit used for outputting a PWM AC power; a reactor circuit smoothly outputting a waveform; a PWM modulation unit used for controlling the inverter circuit; and a brake circuit used for protecting the frequency conversion control system when the motor stops rotating. All the frequency, phase and amplitude can be changed by applying one or more phase sequences to the rotor winding. In addition, a three-phase voltage source generated by a frequency transformer forms a rotating magnetic field on the rotor, changes the frequency of the rotating magnetic field, and regulates excitation of the stator and the rotor, thereby changing the rotating speed of the rotor. The invention has the characteristics of high efficiency, easy shifting, small volume, low power consumption, and the like., and can compensate the nearby reactive hysteresis load at the stator side, to achieve local motion compensation.

Description

technical field [0001] The invention relates to a transmission system composed of a wound-type motor and a control device, in particular to a frequency conversion control system for the rotor side of the wound-type motor that runs in parallel with two quadrants through units, divides the current of the rotor, and performs dual excitation adjustment of the stator and rotor. While outputting torque, reactive power compensation can be performed on the grid at the stator side. Background technique [0002] At present, most of the speed regulation methods of wound wire and squirrel-cage motors adopt the control method of connecting the stator side to the frequency converter, referred to as the stator frequency conversion technology. The motor stator frequency conversion technology is to change the frequency of the industrial frequency power supply through the frequency conversion device, and then supply power to the three-phase winding of the stator, so as to achieve the purpose ...

AI Technical Summary

Problems solved by technology

Therefore, the commonly used solution is to install parallel capacitor reactive power compensation equipment in the power grid to provide compensation for reactive power consumed by inductive loads, and reduce the reactive power provided by the power grid side to the inductive load and transmitted by the line, but this solution requires huge And expensive shunt capacitor reactive power compensation equipment

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