Variable frequency heat pump compressor frequency control method and control module thereof

Abstract

The invention discloses a variable frequency heat pump compressor frequency control method and a control module thereof, and the method comprises the following steps: S1, obtaining sunlight intensity We and external environment detection temperature Tao, correcting the sunlight intensity We and the external environment detection temperature Tao to obtain corrected external environment temperature T, and confirming the upper limit value Fmax 1 of the compressor frequency; S2, determining the upper limit value Fmax 2 of the frequency of the compressor according to the input voltage Vac; S3, setting the operation mode to be a refrigeration water mode or a heating water mode, obtaining the water tank temperature Tw and the set temperature Ts in the set operation mode, and calculating the temperature difference Pn between the water tank temperature Tw and the set temperature Ts according to the set operation mode, the water tank temperature Tw and the set temperature Ts; and S4, judging whether the compressor has the capacity requirement or not according to the temperature difference Pn, and after the compressor has the capacity requirement and is started, determining the control mode of the compressor frequency Fm according to the corrected external environment temperature T, the operation mode and the temperature difference Pn. When the external environment temperature is corrected, the influence of the sunlight intensity is considered, and the problems that the compressor runs unstably and the user experience is poor are solved.

Description

technical field [0001] The invention relates to air source heat pump heating technology, in particular to a method for controlling the frequency of a variable frequency heat pump compressor and a control module thereof. Background technique [0002] With the advancement of the coal-to-electricity project, air heat pump heating has been widely promoted in the north. Among them, the frequency conversion air heat pump has a wide range of operation in low temperature environments in the north because of its controllable frequency of the frequency conversion air heat pump, which directly affects energy efficiency and indoor comfort. , The advantages of high efficiency. At present, the operating frequency of the variable frequency heat pump compressor is controlled in stages according to the outdoor environment, the set temperature and the actual temperature difference, that is, according to the temperature difference between the set temperature and the actual outlet water tempera...

AI Technical Summary

Problems solved by technology

At present, the operating frequency of the variable frequency heat pump compressor is controlled in stages according to the outdoor environment, the set temperature and the actual temperature difference, that is, according to the temperature difference between the set temperature and the actual outlet water temperature, the fuzzy control rule is used to determine the frequency of the compressor. time rate of change, and correct the operating frequency of the compressor according to the compressor's high pressure, low pressure, and compressor discharge temperature. In addition, in the actual operation process, the compressor frequency is also affected by the input voltage and the external ambient temperature. The existing control methods have not Taking the above factors into consideration, there are the following defects: First, the input voltage correction is not accurate enough, which affects the life of the compressor. For example, when the input voltage is too low and the compressor frequency is not reasonably limited, the high compressor frequency will cause The power of the compressor increases, which leads to excessive current of the compressor, which demagnetizes the compressor and affects the service life of the compressor. When it is too high, the starting frequency is too high, the exhaust pressure is too high protection protection, and the compressor is protected to stop; thirdly, the compressor frequency limit that is too low will cause the compressor power to be low, affecting the user's use effect

Images