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Speed sensorless vector control method on basis of cascaded high voltage inverter

A speed sensorless, high-voltage frequency converter technology, applied in vector control systems, control systems, control generators, etc., can solve the problem of being easily affected by the environment, the measurement accuracy of the speed encoder, and the simplicity of the asynchronous motor speed control system, etc. question

Active Publication Date: 2012-04-18
GUODIAN NANJING AUTOMATION
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AI Technical Summary

Problems solved by technology

However, the speed sensor has seriously affected the simplicity, cheapness and reliability of the asynchronous motor speed control system in terms of installation, maintenance, and susceptibility to environmental influences.
Especially in the complex application environment of high-voltage frequency converter, the measurement accuracy of the speed encoder is greatly affected by the environment.

Method used

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  • Speed sensorless vector control method on basis of cascaded high voltage inverter
  • Speed sensorless vector control method on basis of cascaded high voltage inverter
  • Speed sensorless vector control method on basis of cascaded high voltage inverter

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Embodiment Construction

[0033]The invention is a speed sensorless vector control method for cascaded high-voltage frequency converters oriented according to the rotor magnetic field. The coordinate axes M and T are set to rotate at a synchronous speed ω, and the M axis is specified to be along the total flux vector ψ of the rotor. r At this time, the mathematical model of the asynchronous motor on the two-phase (M, T) rotating coordinate system:

[0034] u SM u ST 0 0 = R s + L s p ...

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Abstract

The invention discloses a speed sensorless vector control method on the basis of a cascaded high voltage inverter, which is characterized by comprising the following steps of: 1, establishing a rotor flux linkage voltage model; 2, establishing a rotor flux linkage current model; 3, identifying a rotating speed, using the rotor flux linkage current model in a two-phase rotating coordinate system in the step 2 as an adjustable model, using the rotor flux linkage voltage model in the step 1 as a reference model, utilizing a model reference adaptive system, and adopting a Popov hyperstability theory to obtain a rotating speed identifying model; 4, obtaining a three-phase sinusoidal voltage reference signal by speed and current double close loop control; and 5, sending the three-phase sinusoidal voltage reference signal to a phase-shifting SPWM (Sinusoidal Pulse Width Modulation) distributing plate, controlling a cascaded power unit by utilizing a phase-shifting SPWM control method and controlling the rotating speed of a motor. Due to the adoption of the method disclosed by the invention, a speed sensor does not need to be arranged on a motor shaft, the defects caused by the installation of a speed encoder are avoided, and the flux linkage and the rotating speed of the motor can be well estimated.

Description

technical field [0001] The invention relates to a high-voltage AC motor control method based on cascaded high-voltage frequency converters, in particular to a speed sensorless vector control method based on cascaded high-voltage frequency converters, and belongs to the technical field of power electronics automatic control. Background technique [0002] Cascade high-voltage frequency conversion speed regulation is a speed regulation technology that has been widely used in recent years. Through the high-voltage frequency conversion speed regulation system, the soft start and speed regulation problems of high-power fans and pumps are solved, the energy saving effect is remarkable, and it has a broad development space. The traditional high-voltage inverter control method widely adopts constant voltage-frequency ratio control, that is, V / F control, and usually adopts open-loop constant voltage-frequency ratio and low-frequency voltage compensation technology. High occasions. H...

Claims

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Application Information

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IPC IPC(8): H02P21/14
Inventor 杨奇胡炫张裕峰钱诗宝李冰
Owner GUODIAN NANJING AUTOMATION
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