Asynchronous motor DTC (direct torque control) device and method

A direct torque control, asynchronous motor technology, applied in the direction of motor generator control, AC motor control, electronic commutation motor control, etc.

CN104201956AActive Publication Date: 2014-12-10SHANDONG UNIV OF SCI & TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2014-12-10

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Abstract

The invention provides an asynchronous motor DTC (direct torque control) device comprising a high-pressure asynchronous motor and a high-pressure matrix converter. The high-pressure matrix converter comprises a phase-shift type isolation transformer, a matrix transformation cell array and a main controller. The phase-shift type isolation transformer comprises 3n three-phase secondary windings. The matrix transformation cell array, composed of 3n matrix transformation power cells, is in a 3 lines * 4 rows form. The matrix transformation power cells employ Z source-matrix transformation power cells. The invention further provides a DTC method includes acquiring rotating vectors u<s alpha>, u<s beta>, i<s alpha> and i<s beta>; acquiring stator flux linkages psi<s alpha> and psi<s beta> and an electromagnetic torque Te; acquiring voltage state signals SAN, SAN and SCN and corresponding stator voltage vector; finally controlling the rotating speed of a motor. The asynchronous DTC device and method has the advantages of high reliability of voltage transfer ratio and inversion, safety and stability in operating, low cost, small size, long service life and bilateral controllability of output. Thus the synchronous motor DTC is achieved in a simple and reliable manner.
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Description

technical field

[0001] The invention relates to a motor system and a control method thereof, in particular to an asynchronous motor direct torque control device and a method thereof. Background technique

[0002] High-voltage high-power motors are widely used in petrochemical, cement manufacturing, mining, metallurgy, transportation, electric power, papermaking and steel rolling and other fields. Inverter is an important device to improve the energy efficiency of the motor system. However, energy saving or high-performance variable frequency speed regulation for high-voltage and high-power motors in the industrial field is still in its infancy, which is closely related to the development level of high-voltage inverters.

[0003] The earliest high-voltage frequency conversion speed regulation uses step-down and step-up transformers to achieve high-low-high conversion methods, and its essence is still a low-voltage frequency converter. Later, a high-high direct high-voltage i...

Examples

Embodiment Construction

[0054] The direct torque control device of the asynchronous motor of the present invention, refer to Figure 10 , including asynchronous motors and high-voltage matrix inverters, refer to Figure 8 , that is to connect the three output terminals U, V, W of the high-voltage matrix inverter with an asynchronous motor. The high-voltage matrix inverter includes a phase-shifting isolation transformer, a matrix transformation unit array and a general controller, among which:

[0055] 1) Phase-shifting isolation transformer

[0056] refer to Figure 8 , The phase-shifting isolation transformer has 3n three-phase secondary windings, n is a natural number, every 3 secondary windings form a group and have the same phase, the phases of each group of secondary windings increase in turn, the initial phase is 0°, adjacent The phase difference between them is 60 / n degrees. In the embodiment of the high-voltage matrix converter of the present invention, n is a natural number 3. The three...