A method for determining the real-time power of a compressor

Abstract

The present invention discloses a compressor real-time power determination method and relates to the compressor control field. The method comprises the following steps of determining the current operation frequency of a compressor; collecting the quadrature-axis current value of the compressor in real time when the compressor is running at the current operation frequency; according to a preset corresponding relationship corresponding to the compressor, determining a current power coefficient corresponding to the current operation frequency of the compressor, wherein the preset corresponding relationship comprises the corresponding relationship between an operation power and a power coefficient within the operation frequency range of the compressor; according to the quadrature-axis current value and the current power coefficient, determining the real-time power of the compressor; and calculating whether the quadrature-axis current value is acquired in real time by an actual load or not. Based on the method, the accuracy and the real-time performance of the calculated real-time power are high.

Description

technical field [0001] The invention relates to the field of compressor control, in particular to a method for determining real-time power of a compressor. Background technique [0002] Household appliances such as refrigerators and air conditioners include compressors. If the power of the compressor is too high during operation, it may cause the failure of the household appliances. threshold, one solution is to stop the compressor for protection, but this approach will affect the normal use of electrical appliances; therefore, the second solution for its improvement is to control the compressor to reduce the frequency / speed in stages, Keep the operating power of the compressor not higher than the power threshold, but still continue to work normally; but no matter which solution is used above, it is necessary to determine the real-time power of the compressor. [0003] The operating power of the compressor is affected by many parameters such as phase current, phase resistan...

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Problems solved by technology

[0002] Household appliances such as refrigerators and air conditioners include compressors. If the power of the compressor is too high during operation, it may cause the failure of the household appliances. threshold, one solution is to stop the compressor for protection, but this approach will affect the normal use of electrical appliances; therefore, the second solution for its improvement is to control the compressor to reduce the frequency / speed in stages, Keep the operating power of the compressor not higher than the power threshold, but still continue to work normally; but no matter which of the above solutions, it is necessary to determine the real-time power of the compressor

[0003] The operating power of the compressor is affected by many parameters such as phase current, phase resistance, load and operating frequency. At present, the real-time power of the compressor is determined by detecting the phase current and participating in the calculation. However, the phase current of the compressor is The sine wave and real-time detection are all instantaneous values, so it is necessary to convert the instantaneous value of the phase current into an effective value before calculating the real-time power, and when the operating frequency is different, it will also be affected by different interferences, so this method The real-time and accuracy of the determined real-time power are poor

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