High-performance variable frequency speed regulation method of high-voltage winding asynchronous motor rotor

Abstract

The invention provides a high-performance variable frequency speed regulation method of a high-voltage winding asynchronous motor rotor, belonging to a high-voltage high-power variable frequency speed regulation method. In the method, three-phase windings of the high-voltage winding asynchronous motor rotor are subjected to short circuit and connected with a frequency converter with corresponding voltage levels; a double-closed-loop control strategy is adopted in a stator field direction vector control system without a velocity sensor, wherein an inner control loop comprises a rotor current loop and an outer control loop comprises a stator magnetic link loop and a revolving speed loop; and signals output by the inner control loop are sent to an SVPWM (space vector pulse width modulation) algorithm to generate PWM (pulse-width modulation) pulses which are used for switching on and off a power device in the inversion part of the frequency converter, thereby controlling the variable frequency speed regulation of a high-voltage winding asynchronous motor. The method provided by the invention has the advantage that the high-performance stator field direction vector control strategy without the velocity sensor is adopted, so that the level of the voltage which is borne by the power device required by the frequency inverter is reduced in a high-voltage occasion, thus decreasing the system cost and improving the dynamic and static performances and the revolving speed accuracy of the speed regulation system.

Description

technical field [0001] The invention relates to a high-voltage and high-power frequency conversion speed regulation method, in particular to a high-performance frequency conversion speed regulation method for a high-voltage winding asynchronous motor rotor. Background technique [0002] In my country, high-voltage wound asynchronous motors have been widely used in industrial occasions such as coal, electric power, metallurgy, and chemical industry, which has improved industrial production efficiency. At present, the speed regulation methods of high-voltage wound asynchronous motors mainly include rotor resistance speed regulation, cascade speed regulation, high-voltage soft start, high-voltage frequency conversion, etc. The first three control methods all have problems such as low speed regulation accuracy, poor dynamic performance, and high energy consumption. Compared with the first three control methods, the high-voltage frequency conversion speed regulation method has h...

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Problems solved by technology

[0004] The present invention aims at the problems that the existing high-voltage wire-wound asynchronous motor frequency conversion speed regulation system adopts ordinary open-loop V / F control, the dynamic and static performance of motor speed regulation is poor, and it is not suitable for high-performance frequency conversion speed regulation occasions, etc., and provides a high-voltage winding High performance variable frequency speed regulation method for asynchronous motor rotor

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