Method and system for controlling frequency conversion refrigerant temperature of refrigeration system

Abstract

The invention discloses a method and a system for controlling frequency conversion refrigerant temperature of a refrigeration system. The method comprises the following steps that: a first temperature sensor samples the temperature of a refrigeration space; a temperature control module is used for comparing a temperature value of the refrigeration space and a preset object temperature value to obtain a first temperature difference value, and performing PID (Proportion Integration Differentiation) regulation on the first temperature difference value to obtain an object temperature value of an evaporator coil pipe; a second temperature sensor samples the temperature of the evaporator coil pipe; the temperature control module is used for comparing a temperature value of the evaporator coil pipe and the object temperature value of the evaporator coil pipe to obtain a second temperature difference value, performing the PID regulation on the second temperature difference value to obtain an object working frequency of a compressor, and outputting the object working frequency to a frequency conversion inversion unit; and the frequency conversion inversion unit drives the compressor to work according to the object working frequency of the compressor and controls the temperature value of the refrigeration space to be higher than the preset temperature value. According to the scheme disclosed by the invention, rapid and precise regulation on the frequency conversion refrigerant temperature of the refrigeration system is achieved.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to a method and system for controlling the frequency conversion refrigeration temperature of a refrigeration system. Background technique [0002] The control method of frequency conversion refrigeration temperature in the refrigeration system in the prior art usually adopts a single-loop segmentation from the temperature difference (the difference between the actual temperature value of the refrigeration space and the preset target temperature value of the refrigeration space) to the frequency of the compressor. However, this method has the following defects: it is highly dependent on the characteristics of the refrigeration link of the system, so that this method needs a large amount of empirical data to realize the temperature regulation of the refrigeration system; and this method cannot realize the frequency conversion refrigeration temperature of the refrigeration system....

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Problems solved by technology

[0002] The control method of frequency conversion refrigeration temperature in the refrigeration system in the prior art usually adopts a single-loop segmentation from the temperature difference (the difference between the actual temperature value of the refrigeration space and the preset target temperature value of the refrigeration space) to the frequency of the compressor. However, this method has the following defects: it is highly dependent on the characteristics of the refrigeration link of the system, so that this method needs a large amount of empirical data to realize the temperature regulation of the refrigeration system; and this method cannot realize the frequency conversion refrigeration temperature of the refrigeration system. quick and precise adjustment

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