A compressor driving voltage saturation control method and device

Abstract

The invention discloses a compressor driving voltage saturation control method and device. When it is determined that the current voltage saturation rate is greater than a preset limit value, the value of the integral item of the control speed loop decreases according to the preset first speed range until the current voltage saturation rate is low. At the preset limit value, the value of the input item of the speed loop is changed to zero during the decrease of the value of the integral item of the speed loop. At this time, the value of the integral item of the speed loop is equal to the current command. To prevent the voltage saturation rate from rising by the way of command drop, the present invention directly adopts the way of controlling the value drop of the integral item of the speed loop, skipping the control of the speed PI regulator, and reducing the delay of the speed loop control from the point of view of the control link, thereby The response speed of the voltage saturation rate drop is accelerated, which effectively avoids the situation that the voltage saturation rate cannot be quickly reduced when the input voltage of the air conditioner drops relatively quickly, and ensures that the motor operates within the allowable range.

Description

technical field [0001] The present invention relates to the technical field of variable frequency air conditioners, and more particularly, to a method and device for controlling the saturation of the driving voltage of a compressor. Background technique [0002] With the improvement of energy efficiency level in the domestic air-conditioning industry and the continuous popularization of inverter air conditioners in the market, inverter controllers have higher and higher requirements on the drive reliability of air conditioner compressors. However, in China, especially in some underdeveloped counties and rural areas, the power supply grid fluctuates greatly, and it is very common for the input voltage to drop rapidly during the operation of the air conditioner. In order to ensure the normal operation of the air-conditioning compressor without the shutdown phenomenon when the input voltage drops rapidly, it is necessary to add the compressor drive voltage saturation control to...

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Problems solved by technology

[0005] In view of this, the present invention discloses a compressor driving voltage saturation control method and device to solve the problem that in the traditional solution, due to the slow response time of the speed loop, when the input voltage of the air conditioner drops relatively quickly, the rapid drop cannot be achieved. The purpose of the voltage saturation rate is to eventually make the motor run outside the allowable voltage range, and even cause the motor to go out of adjustment and stop

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