Soft starting method for high-voltage variable-frequency speed-regulating device

A speed control device, high-voltage frequency conversion technology, applied in the starting device and other directions, can solve the problems of unsatisfactory waveform, narrow pulse width, long operating cycle, etc., and achieve the effect of realizing non-disturbance switching, increasing pulse width and improving quality

Inactive Publication Date: 2014-04-02
SHANGHAI POWER EQUIP RES INST +1
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AI Technical Summary

Problems solved by technology

The low-frequency part has low frequency, low output voltage, narrow pulse width, long operating cycle, and unsatisfactory waveform

Method used

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  • Soft starting method for high-voltage variable-frequency speed-regulating device

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Embodiment Construction

[0014] In order to make the present invention more comprehensible, a preferred embodiment is described in detail below with accompanying drawings.

[0015] The soft start method of the high-voltage variable-frequency speed-regulating device provided by the present invention is as follows: the motor is started from 0 Hz (i.e. in a static state), and by changing the output voltage of the high-voltage variable-frequency variable-speed regulating device, the high-voltage variable-frequency variable-speed regulating device is output The frequency of the voltage is adjusted very low, and then gradually increased to the rated frequency, the amplitude of the output voltage of the high-voltage frequency conversion speed control device increases correspondingly with the increase of frequency, so that the rotor speed increases with the frequency of the output voltage of the high-voltage frequency conversion speed control device Increase and rise until the rated speed.

[0016] In the ent...

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Abstract

The invention provides a soft starting method for a high-voltage variable-frequency speed-regulating device. A motor is driven to be started from 0Hz, the frequency of the output voltage of the high-voltage variable-frequency speed-regulating device is increased gradually to a rated frequency from low to high, the amplitude of the output voltage is increased along with the increase of the frequency, and the rotating speed of a rotor is increased to a rated rotating speed; in an entire frequency-regulating process, a high-frequency part and a low-frequency part are formed by taking 5Hz as a critical point; a main controller is used for transmitting controlled variables, namely, voltage and frequency to a power supply unit at the high-frequency part, and transmitting controlled variables, namely, voltage, angle and the angular speed to the power supply unit at the low-frequency part. By adopting the method provided by the invention, the output voltage waveform can still be distributed in a sine form even at a very low frequency; via the low-frequency part, the carrier frequency is reduced, the pulse width is increased, and the quality of the output voltage waveform is improved; undisturbed switching between a low frequency and a high frequency is realized, needed sine waves are output in an entire frequency range, and the motor current meets requirements in the entire process.

Description

technical field [0001] The invention relates to a soft start method, in particular to a soft start method for a high-voltage frequency conversion speed regulating device using unit series multiplexing technology, and belongs to the technical field of high voltage frequency conversion speed regulation devices. Background technique [0002] The high-voltage frequency conversion speed control device adopts unit series multiple technology, usually the starting frequency is 5Hz, which reduces the starting current of the motor to a large extent, but there is still an impact on the motor current. In addition, starting from 5Hz is only suitable for asynchronous starting, not for synchronous starting, and cannot complete the variable frequency starting of synchronous motors. [0003] The frequency conversion start of synchronous motor is to start by changing the speed of the stator rotating magnetic field and using the synchronous torque. It is required that at the beginning of start...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/20
Inventor 逯乾鹏顾立刚周蕴花赵莉唐小亮张林云
Owner SHANGHAI POWER EQUIP RES INST
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