Compressor drive voltage saturation control method and device

Abstract

The invention discloses a compressor drive voltage saturation control method and device. When it is determined that the current voltage saturation rate is larger than the preset boundary value, the speed loop integral term value is controlled to be reduced according to the preset first speed amplitude till the current voltage saturation rate is lower than the preset boundary rate, in the speed loop integral term value reducing process, the speed loop input term value is changed into zero, the speed loop integral term value is equal to a current instruction at the time, and therefore increasingof the voltage saturation rate is prevented in a current loop in a current instruction reducing control manner. The manner that the speed loop integral term value is controlled to be reduced is directly adopted, speed PI adjuster control is skipped, the speed loop control time delay is reduced from the control link, accordingly, the reducing response speed of the voltage saturation rate is increased, accordingly, the situation that the voltage saturation rate cannot be rapidly reduced under the situation that the input voltage of an air conditioner is reduced rapidly is effectively avoided, and it is guaranteed that a motor runs in the allowable range.

Description

technical field [0001] The present invention relates to the technical field of frequency conversion air conditioners, and more specifically, relates to a compressor driving voltage saturation control method and device. Background technique [0002] With the improvement of the energy efficiency level of the domestic air-conditioning industry and the continuous popularization of inverter air conditioners in the market, the requirements for inverter controllers on the driving reliability of air-conditioning compressors are getting higher and higher. 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 conditioner compressor without shutting down when the input voltage drops rapidly, it is necessary to add compressor driving voltage saturation control to the ...

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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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