Instantaneous power detection and load identification based induction motor cooperative control system

Abstract

The invention discloses an instantaneous power detection and load identification based induction motor cooperative control system which realizes energy-saving control on a light-loaded or unloaded three-phase induction motor and mainly comprises an instantaneous power detection and load identification cooperative controller using a digital signal processor TMS320F28346 as a core, a three-phase bridge power amplifier, a three-phase bridge driving circuit, the three-phase induction motor, a three-phase diode rectifier bridge, an instantaneous power detection link, a current detection link, a coder rotating speed detection link, a load identification link, a +24V switch power source, a +15V switch power source, a + / -12V switch power source, a +5V power source and the like. An instantaneous power detection and load identification based induction motor cooperative control method is adopted to control stator exciting current of the light-loaded or unloaded three-phase induction motor, and power factors of the three-phase induction motor are adjusted by load rate obtained on the basis of load identification, so that operating efficiency of the three-phase induction motor is effectively improved, and good electricity-saving effect is achieved.

Description

technical field [0001] The invention relates to an induction motor cooperative control system based on instantaneous power detection and load identification, belongs to the technical field of power electronics and electric transmission, and is used for realizing power-saving control of three-phase induction motors under periodic load or light load conditions. Background technique [0002] With the development of science and technology and the improvement of production level, the demand for electric energy is also increasing. Judging from the total power consumption of countries in the world, the electric energy consumed by motors accounts for about 60% to 75% of the total power generation. In the current situation of energy shortage in the world and relatively insufficient power supply, it is of great practical significance to deeply study the energy saving problem of electric motors. [0003] The three-phase induction motor is a type of AC motor widely used in industry. Wh...

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Problems solved by technology

[0006] The technical problem solved by the present invention is: to overcome the existing three-phase induction motor AC voltage regulation and energy-saving control method, because the thyristor AC voltage regulation is used, when the conduction angle is small, the current waveform appears intermittent, the power factor is difficult to detect, and It avoids the problem of affecting the safe operation of voltage regulation and energy-saving inverters when the three-phase imbalance of the power grid is serious, and provides a direct power control system for three-phase induction motors, which greatly improves the operating efficiency of three-phase induction motors under light-load or no-load conditions.

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