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CN-122015367-A - Energy efficiency cooperative regulation system for air energy extraction process

CN122015367ACN 122015367 ACN122015367 ACN 122015367ACN-122015367-A

Abstract

The invention relates to the technical field of energy-saving air conditioners and discloses an energy efficiency cooperative regulation system for an air energy extraction process, which comprises a working condition parameter monitoring module, a control module and a control module, wherein the working condition parameter monitoring module is used for acquiring an electronic expansion valve opening instruction sequence and a compressor exhaust pressure sequence; the dynamic response extraction module calculates first derivatives of opening instructions and exhaust pressure relative to sampling time to determine an adjusting gradient vector and a response gradient vector, the circulation delay decoupling module locks refrigerant circulation hysteresis quantity by using a discrete cross-correlation function, the energy efficiency cooperative adjustment module carries out time axis translation compensation on an electronic expansion valve adjusting instruction according to the hysteresis quantity, so that a throttling adjustment action and a load response action are synchronously aligned on a physical time axis.

Inventors

  • XIE XIAOYU
  • SUN ZHANWU

Assignees

  • 集创智造科技(青岛)有限公司

Dates

Publication Date
20260512
Application Date
20260326

Claims (9)

  1. 1. An energy efficiency co-conditioning system for an air energy extraction process, comprising: The working condition parameter monitoring module is used for acquiring an opening instruction sequence of the electronic expansion valve in a continuous sampling period and an exhaust pressure sequence of the compressor in a corresponding sampling period; The dynamic response extraction module is used for generating an opening adjustment gradient vector representing the disturbance characteristic of the throttle side by calculating the first derivative of the opening instruction sequence relative to the sampling time, and generating a pressure response gradient vector representing the load response characteristic by calculating the first derivative of the exhaust pressure sequence relative to the sampling time; The circulation delay decoupling module is used for establishing a discrete cross-correlation function of an opening adjustment gradient vector and a pressure response gradient vector in a preset historical rolling window, and determining the discrete step offset as a refrigerant circulation hysteresis quantity representing the physical transmission delay of the refrigerant in the two-phase flow pipeline by searching the discrete step offset corresponding to the discrete cross-correlation function reaching a global association degree maximum point; And the energy efficiency cooperative regulation module is used for carrying out advanced translation compensation on a time axis relative to a frequency jump point of the compressor by an regulation datum point of the electronic expansion valve according to the circulation hysteresis quantity of the refrigerant, so that the throttle side regulation action of the electronic expansion valve and the exhaust side response action of the compressor are overlapped and aligned on a physical time axis, and thermodynamic transfer time lag of the mass flow of the refrigerant in the heat exchange circulation loop is compensated.
  2. 2. The energy efficiency co-regulation system for an air energy extraction process according to claim 1, wherein the cyclic delay decoupling module is configured to monitor a peak saliency of the discrete cross-correlation function, and when the peak saliency is lower than a preset 1.2 to 1.5 times of the signal-to-noise ratio range, expand a length of the historical rolling window in a stepping manner until a peak greater than the signal-to-noise ratio range is identified, so as to determine a refrigerant cyclic delay.
  3. 3. The system of claim 1, further comprising a time delay calibration module for obtaining a valve position feedback signal of the electronic expansion valve and a measured input power of the compressor, and calculating a time offset correction value between a transition time point of the measured input power and an action time point of the valve position feedback signal, wherein the time delay calibration module is configured to superimpose the time offset correction value on the refrigerant circulation hysteresis.
  4. 4. The energy efficiency co-regulation system for an air energy extraction process of claim 1, further comprising a thermodynamic state sensing module for monitoring a load response index determined by a ratio of an exhaust pressure transient increase to an input power transient increase of the compressor, wherein the thermodynamic state sensing module is for outputting a defrosting switching command when it is determined that the load response index is lower than a preset decay threshold and an opening of the electronic expansion valve reaches a preset opening limit value.
  5. 5. The energy efficiency co-regulating system for an air energy extraction process according to claim 1, wherein the energy efficiency co-regulating module is configured to introduce a refrigerant circulation lag amount as a feedforward offset amount into a regulating loop of the electronic expansion valve, such that an opening degree regulating command of the electronic expansion valve leads an operating frequency regulating command of the compressor at a time starting point.
  6. 6. The energy efficiency co-conditioning system for an air energy extraction process of claim 1, wherein the dynamic response extraction module is configured to filter the data sequence by a band-pass filter having a cut-off frequency that is synchronously adjusted with a current operating frequency of the compressor to reject high frequency pressure pulsations that are independent of refrigerant circulation prior to calculating the gradient vector.
  7. 7. The system of claim 3, wherein the delay calibration module stores a decay relation curve of the kinematic viscosity of the refrigerant decreasing with increasing accumulated operating time, and is configured to determine a deposited thickness of the lubricant in the heat exchanger according to a historical drift amount of the time offset correction value, and the energy efficiency co-adjustment module is configured to adjust an adjustment gain of the circulating hysteresis of the refrigerant when the deposited thickness of the lubricant exceeds 0.5 mm.
  8. 8. The system of claim 1, wherein the operating mode parameter monitoring module comprises a pressure sensor disposed at an outlet of the compressor, a pressure transmitter disposed at an inlet of the electronic expansion valve, and a temperature sensor disposed at a surface of the heat exchanger pipeline, and wherein a sampling period of the pressure sensor is set to be 1:1 synchronous with an update period of an opening adjustment command of the electronic expansion valve.
  9. 9. The system of claim 1, wherein the energy efficiency co-regulation module further comprises a safety protection module for monitoring the discharge temperature and the suction pressure, and wherein the safety protection module is used for forcibly locking the current opening of the electronic expansion valve and reducing the operation frequency of the compressor when the circulation hysteresis of the refrigerant deviates from an operation steady-state envelope surface formed by a preset discharge temperature and suction pressure mapping relationship.

Description

Energy efficiency cooperative regulation system for air energy extraction process Technical Field The invention relates to an energy efficiency cooperative regulation system for an air energy extraction process, and belongs to the technical field of energy-saving air conditioners. Background The current air source heat pump is used as an air heat energy extraction device and widely applied to commercial complexes and industrial environmental control systems, the prior art generally adopts a feedback control strategy to adjust the operation frequency of a compressor and the opening of an electronic expansion valve so as to maintain the superheat degree of an outlet of an evaporator in a set range, mass flow disturbance generated by the action of the electronic expansion valve propagates in a circulating loop in a density wave mode in the evaporation phase change process of a refrigerant, and a sensor is used for collecting corresponding pressure response and power feedback signals. When environmental load changes, because the two-phase flow has dispersion characteristic, there is physical transmission time delay evolving along with working condition between pressure response and regulating instruction, the existing means is prone to stacking pressure sensor devices or increasing sampling frequency of controller, but on the basis of assumption that the refrigeration loop is a rigid transmission body, phase deviation and waveform distortion generated by density wave in two-phase region are not considered, control strategy algorithm logic shows hysteresis, for example, chinese patent application publication No. CN119983611a discloses a control method, device, medium and heat pump system of electronic expansion valve, by monitoring temperature rising rate pre-set interval, temperature rising rate is in thermodynamic state evolution end, changing characteristic and refrigerant mass flow transmission intrinsic physical hysteresis do not have direct linear mapping, heat exchanger frosting or refrigerating oil deposition changing working condition only depends on temperature rising speed to predict opening, low-layer physical transmission phase decoupling causes time axis dislocation of regulating action and real load response, and often difficult to inhibit overheat oscillation, for accurately identifying real hysteresis quantity determined by phase mechanical characteristic, the temperature rising speed pre-set in the preset interval is monitored, temperature rising rate belongs to thermodynamic state evolution time axis, and causes compression vibration of regulating instruction and physical state under the working condition is frequently influenced by the compressor. Therefore, how to lock the intrinsic physical lag of mass flow transmission in a complex two-phase flow heat transfer environment and realize the precise alignment of the action instruction of an executing mechanism and the evolution of thermodynamic state becomes the technical problem to be solved by the invention. Disclosure of Invention In order to solve the problems in the background technology, the technical scheme of the invention is as follows, an energy efficiency cooperative regulation system for an air energy extraction process comprises: The working condition parameter monitoring module is used for acquiring an opening instruction sequence of the electronic expansion valve in a continuous sampling period and an exhaust pressure sequence of the compressor in a corresponding sampling period; The dynamic response extraction module is used for generating an opening adjustment gradient vector representing the disturbance characteristic of the throttle side by calculating the first derivative of the opening instruction sequence relative to the sampling time, and generating a pressure response gradient vector representing the load response characteristic by calculating the first derivative of the exhaust pressure sequence relative to the sampling time; The circulation delay decoupling module is used for establishing a discrete cross-correlation function of an opening adjustment gradient vector and a pressure response gradient vector in a preset historical rolling window, and determining the discrete step offset as a refrigerant circulation hysteresis quantity representing the physical transmission delay of the refrigerant in the two-phase flow pipeline by searching the discrete step offset corresponding to the discrete cross-correlation function reaching a global association degree maximum point; and the energy efficiency cooperative adjusting module is used for conducting advanced translation compensation on a time axis relative to a frequency jump point of the compressor according to the refrigerant circulation lag amount, so that the throttle side adjusting action of the electronic expansion valve and the exhaust side responding action of the compressor are overlapped and aligned on a physical time axis, and thermodynamic transfer time lag of