A Closed-loop Vector Redundancy Control Method for Inverter in High-speed Operation

Abstract

The present invention provides a closed-loop vector redundancy control method for a frequency converter during high-speed operation. The main machine of the frequency converter periodically sends the integral component of the excitation voltage given value, the integral component of the torque voltage given value and the synthesized voltage to the slave machine of the frequency converter. The three physical quantities of the included angle between the vector and the reference axis A-axis; when the inverter host fails, the inverter host sends a digital signal to the inverter slave, at this time: the inverter slave will receive the last The integral component of the excitation voltage given value and the integral component of the torque voltage given value are taken as the initial value of the amplitude; the slave machine of the inverter performs synchronous speed calculation and angle integration according to the speed measured by the current encoder to obtain an angle value, which is the same as The received composite voltage vector of the last beat before the fault occurs is added to the included angle of the reference axis A-axis as the initial value of the angle; the inverter slave starts wave operation. Compared with traditional redundant switching, the invention realizes redundant switching during high-speed operation.

Description

technical field [0001] The invention belongs to the field of frequency converter control, and in particular relates to a closed-loop vector redundancy control method of a frequency converter during high-speed operation. Background technique [0002] Some important production occasions such as metallurgy and petroleum have high requirements on the reliability of the equipment, and require the equipment to be able to run continuously and stably for a long time. Once these equipment break down, it will have a huge negative impact on production, causing serious economic losses, and even There may be some safety accidents, but any electrical equipment has a certain life limit, and there is a possibility of failure. In order to reduce the impact of device failure on production, it is necessary to introduce redundant control. [0003] The redundant control of the closed-loop vector of the inverter is to use one inverter as the master and the other as the slave. The two inverters ar...

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