Loading and unloading control method for frequency conversion compressor of air source heat pump unit

Abstract

The invention relates to the control technology of the frequency conversion compressor in the air source heat pump unit, which discloses a control method for loading and unloading the frequency conversion compressor of the air source heat pump unit, so as to quickly adapt to the change of the system and reduce the fluctuation tendency after reaching the set temperature. Stabilization time, more precise and accurate control of compressor loading and unloading. The control method includes: a. determining the current corresponding loading and unloading range interval according to the difference between the detected current actual water temperature and the target water temperature, the loading and unloading range range is pre-divided, and different intervals have different loading and unloading initial values; b. .Continuously detect the actual water temperature change rate of each cycle with a fixed time length as a cycle; c. Based on the determined current corresponding loading and unloading range interval and the detected actual water temperature change rate of the current cycle, use the loading and unloading function relational expression Calculate the loading and unloading range of the compressor; d. adjust the current frequency of the compressor according to the calculated loading and unloading range of the compressor.

Description

technical field [0001] The invention relates to the control technology of the frequency conversion compressor in the air source heat pump unit, in particular to a control method for loading and unloading the frequency conversion compressor of the air source heat pump unit. Background technique [0002] A heat pump system that uses forced convection heat exchange between refrigerant and air to provide users with the required cold or hot water has a large number of applications in industry and life. Compared with fixed-frequency compressors, variable-frequency compressors have a smaller starting current and can achieve more flexible and energy-saving loading and unloading control, etc., and are increasingly used in air source heat pump systems. Inverter compressors have diversified control methods according to the state of the unit. If a better control method is not designed, the advantages of flexible adjustment and more energy saving of the inverter compressor will be greatl...

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned first control method has the problem that the control is not accurate enough, and it is easy to cause the problem of repeated loading and unloading of the compressor until the final dynamic stability. The control cycle is long and the energy is wasted more

Although the second control method is stricter than the former, the change trends of the two variables are not consistent in the actual changing working conditions, and the calculation results may be inaccurate

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