Feedforward decoupling vector control method for operation of frequency converter with output reactor

A vector control, feedforward decoupling technology, applied in the field of feedforward decoupling vector control

Active Publication Date: 2015-05-06
WISDRI WUHAN AUTOMATION
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Problems solved by technology

But in some high-performance, high-speed AC dri

Method used

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  • Feedforward decoupling vector control method for operation of frequency converter with output reactor
  • Feedforward decoupling vector control method for operation of frequency converter with output reactor
  • Feedforward decoupling vector control method for operation of frequency converter with output reactor

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Embodiment Construction

[0052] The present invention will be described in further detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0053] refer to Figure 5 The shown feed-forward decoupling vector control block diagram of the frequency converter with output reactor operation, the actual speed ω of the motor 18 (the angular frequency of the current flowing through the three-phase AC reactor) is obtained through the speed measuring device 19, and ω is related to the controller's Motor command speed ω * Compare by the first comparator 28, the ω obtained after the first comparator 28 compares and ω * After the speed difference between the two passes through the speed regulator 5, the torque command T is obtained * . Torque command T * with the magnetizing inductance L of the motor 18 m and rotor inductance L s After calculating in the torque current calculator 6, then through the first divider 27 and the rotor flux linkage value By dividing, the T-a...

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Abstract

The invention provides a feedforward decoupling vector control method for the operation of a frequency converter with an output reactor. The feedforward decoupling vector control method comprises the steps of inputting the inductance and resistance parameters of a three-phase AC reactor allocated for the frequency converter into the controller of the frequency converter before the operation of the frequency converter, when the frequency converter starts to operate and the controller performs vector control, calculating, by the controller, the deviation between a motor input end voltage vector generated by the three-phase AC reactor and the expected output vector of the frequency converter according to the off-line input parameters of the three-phase AC reactor in combination with the three-phase output current of the frequency converter detected by the internal current sensor of the frequency converter and a motor rotating speed obtained by a motor speed measuring device. And then performing feedforward compensation on the deviation in the output voltage reference waveform of the controller. The feedforward decoupling vector control method has the beneficial effects that the stator voltage vector obtained by the input end of the motor is completely consistent with the expected output voltage vector of the frequency converter by virtue of the feedforward compensation and the influence of the inductance of the reactor on actual voltage vector control is eliminated.

Description

technical field [0001] The invention relates to a feed-forward decoupling vector control method for a frequency converter running with an output reactor, which is applied to the vector control that needs to run with an output reactor. Background technique [0002] In the actual use of the frequency converter, if the distance between the motor driven by the frequency converter and the frequency converter is greater than the specified cable length marked on the product of the frequency converter, the frequency converter must be equipped with filtering equipment on its output side to enhance The long-distance load capacity of the inverter. Filtering equipment generally includes three-phase AC output reactors, three-phase dv / dt filters and three-phase sine wave filters, among which three-phase AC output reactors are the most reasonable in price and most widely used. [0003] When general inverter products are operated with three-phase AC reactor for vector control, there is no ...

Claims

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Application Information

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IPC IPC(8): H02P21/00H02P27/08
Inventor 余骏王国强康现伟
Owner WISDRI WUHAN AUTOMATION
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