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Software Realization Method of Flying Fixed-frequency Start-up of High-Voltage Frequency Converter

A high-voltage inverter and software-implemented technology, applied to the starter of a single multi-phase induction motor, motor generator/starter, etc., can solve the problem that the scheme of detecting the rotor frequency of the DC bus cannot be adopted, etc.

Inactive Publication Date: 2016-04-13
ANHUI EHE NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is theoretically feasible, but there is no DC bus current detection in the power unit of the high-voltage inverter, so the scheme of indirectly detecting the rotor frequency by detecting the DC bus current cannot be used

Method used

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  • Software Realization Method of Flying Fixed-frequency Start-up of High-Voltage Frequency Converter
  • Software Realization Method of Flying Fixed-frequency Start-up of High-Voltage Frequency Converter

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Embodiment Construction

[0012] like figure 1 , 2 As shown, a software implementation method of high-voltage frequency converter flying car fixed-frequency start, when the high-voltage motor of the flying car rotates freely, the high-voltage frequency converter inputs a fixed output frequency close to the speed of the high-voltage motor for the stator, and samples the output current of the high-voltage motor, according to Calculate the initial voltage from the UF curve when the high-voltage motor is running normally, and then judge whether the synchronization waiting time is over. If the synchronization waiting time is over, the program ends. If the synchronization waiting time is not over, calculate the current of each phase according to the sampled current value. Calculate the current vector value according to the instantaneous value of each phase current, judge whether the current vector value exceeds the current limit range, if the current vector value exceeds the current limit range, the program ...

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Abstract

The invention discloses a software implementation method for starting a runaway of a high voltage inverter at fixed frequency. The method comprises the steps of: estimating the rotating speed of a motor which rotates freely without a speed sensor; starting to output a fixed frequency from a low voltage under the premise of controlling the current; slowly improving the voltage till the constant torque point arranged by a normal motor UF (Ultrasonic Frequency) curve; and slowly improving the torque through outputting fixed rotating speed by a stator under a rated current so as to realize synchronous rotation of the stator and a rotor. According to the invention, the rotating speed of the motor is estimated and the output current by the inverter is strictly limited, so that smooth start of the high pressure motor is realized when the rotor is no stationary by a way of slowly improving the torque by output at the fixed frequency.

Description

technical field [0001] The invention relates to the technical field of high-voltage frequency conversion control, in particular to a software implementation method for a high-voltage frequency converter flying at a fixed frequency. Background technique [0002] High-power high-voltage inverters are widely used in various fan and pump equipment in petrochemical, electric power, metallurgy, urban construction and other industries, and play an important role in reducing consumption, saving energy, and improving processes. In many large-scale motor drive systems, especially in fan applications, the moment of inertia of the rotor and the equipment it carries is very large, and the free stop time from the rotating state to the stationary state ranges from tens of minutes to several hours. If there is a power failure of the frequency converter, the motor will rotate freely and immediately re-power on and start directly. The excessive torque current will cause the motor to over-curr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P1/26
Inventor 唐韦韦赵娟沈庆栾振虎赵洁马志保姚俊
Owner ANHUI EHE NEW ENERGY TECH
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