Full speed range control method and control device of double-feedback electric motor

Abstract

The invention relates to a full speed range control method and control device for a double-feed motor; the invention adopts a rotor side frequency conversion vector control method and carries out adjustment by a given rotating speed and an actual rotating speed, so as to realize the decoupling control of a torque current and a field current; besides, the invention also adopts a diode-clamp back-to-back double tri-level transducer which can lead a rotating difference power to be capable of flowing in double direction by the transducer within the full speed range, thus greatly improving the energy saving efficiency. The method can lead the effects of the device to an electric network to minimize and simultaneously obtain a fast motor torque response; in the whole control process, the voltage and the current aberration rates of the device of the electric network access point are low; the unit power factor operation of the stator side of the motor reduces the reactive impact of the electric network; the switching frequency of the transducer is low, thus reducing the heating of a system and improving the efficiency of the transducer. The method is simple; the device has the advantages of compact structure, being easy to assemble and being convenient to operate; which has board practicability in the technical field.

Description

technical field [0001] The invention relates to a full-speed range control method and a control device of a doubly-fed motor, and is especially suitable for driving a high-voltage winding asynchronous motor of a mine hoist. Background technique [0002] At present, in the domestic mining industry, most mine hoist systems use high-voltage wound asynchronous motors as the main drive motor. In order to adjust the speed of this high-voltage wound asynchronous motor, there are two methods that are used more: 1. The rotor series resistance of the high-voltage wound motor, and the speed is adjusted by cutting off the resistance step by step; 2. The rotor series of the high-voltage wound motor Resistance, when the frequency is low, the stator side frequency conversion (VVVF) is used for speed regulation. Since the speed regulation method of the rotor string resistance is stepped speed regulation, there is a sudden change in the speed during the speed regulation process, and the mec...

AI Technical Summary

Problems solved by technology

Since the speed regulation method of the rotor string resistance is stepped speed regulation, there is a sudden change in the speed during the speed regulation process, and the mechanical impact is relatively large. In this speed regulation method, the slip power is consumed in the form of heat, resulting in waste of electric energy; Although the speed regulation by stator frequency conversion (VVVF) can reduce the consumption of slip power at low speed, this speed regulation method cannot reduce the consumption of slip power in the full speed range.

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