Frequency conversion control device and control method for heat pump

Abstract

The disclosure provides a frequency conversion control device and control method for a heat pump. The frequency conversion control device comprises a loop formed by an evaporator, a compressor, a condenser and an electronic expansion valve, wherein the electronic expansion valve is driven by a controller through a driver; the compressor is controlled by the controller to realize frequency conversion control through a frequency converter; the controller receives acquired temperature and pressure of a refrigerant at an evaporator outlet and indoor temperature; the controller realizes respective control of the frequency of a compressor frequency converter and the opening degree of the electronic expansion valve to the indoor temperature and the superheat degree of the refrigerant at the evaporator outlet based on data acquired in real time by adopting a bivariate adaptive fuzzy control strategy. According to the control device, the superheat degree of the refrigerant at the evaporator outlet is controlled by using the electronic expansion valve; and the indoor temperature is controlled by adjusting the operation frequency of the compressor.

Description

technical field [0001] The present disclosure relates to the technical field of frequency conversion heat pump control, in particular to a frequency conversion control device and control method for a heat pump. Background technique [0002] In recent years, with the rapid development of intelligent control theory and frequency conversion technology, intelligent control of heat pump devices has become a research hotspot in the field of HVAC energy conservation. Adopting scientific frequency conversion control strategy can not only improve the working efficiency of the heat pump, but also avoid excessive waste of resources to a certain extent. [0003] The current heat pump control cannot adjust the operating status of the heat pump system in real time with changes in ambient temperature, heat load demand and other working conditions, and the operating efficiency is low. There are two main reasons for this situation: [0004] 1. The heat pump system is a nonlinear system wit...

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Problems solved by technology

[0004] 1. The heat pump system is a nonlinear system with large lag and strong coupling. Conventional control strategies often use constant control parameters to achieve system control, and it is difficult to guarantee the control accuracy of the system under various working conditions;

[0005] 2. The change of each control quantity of the control system can easily cause the oscillation of the whole system and affect the heat exchange efficiency of the system

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