CN-122015263-A - Control method and device of variable-frequency screw machine, air conditioner and storage medium

Abstract

The application relates to the technical field of air conditioner control, in particular to a control method and device of a variable-frequency screw machine, an air conditioner and a storage medium. The variable-frequency screw machine comprises at least one variable-frequency screw machine unit, and the control method of the variable-frequency screw machine is characterized in that the current cooling water inlet temperature of the variable-frequency screw machine unit is firstly obtained. The method comprises the steps of selecting a target chilled water outlet temperature matched with the current cooling water inlet temperature from a first performance data set according to an energy efficiency optimal principle, then matching a second performance data set according to the target chilled water outlet temperature, and finally selecting a target unit load of a variable-frequency screw unit matched with the current cooling water inlet temperature from the second performance data set according to the energy efficiency optimal principle so as to control the operation of the variable-frequency screw unit based on the target unit load. Therefore, the operation control of the variable-frequency screw machine unit can optimize and adjust by taking the performance data as a guide according to the actual working condition, so that the operation efficiency of the variable-frequency screw machine unit is improved.

Inventors

• LIU JINHUI
• XIONG JUN
• YU BOYANG
• ZHOU CHAO

Assignees

• TCL空调器(中山)有限公司

Dates

Publication Date

20260512

Application Date

20260228

Claims (10)

1. 1. The control method of the variable-frequency screw machine is characterized in that the variable-frequency screw machine comprises at least one variable-frequency screw machine set, and the control method of the variable-frequency screw machine comprises the following steps: acquiring the current cooling water inlet temperature of the variable-frequency screw unit; Selecting a target chilled water outlet temperature matched with the current cooling water inlet temperature from a first performance data set according to an energy efficiency optimal principle, wherein the first performance data set represents performance data of the variable-frequency screw unit at different cooling water inlet temperatures and different chilled water outlet temperatures; Matching a second performance data set according to the target chilled water outlet temperature, wherein the second performance data set represents performance data of the variable-frequency screw unit under different cooling water inlet temperatures and different unit loads; and selecting a target unit load of the variable-frequency screw unit matched with the current cooling water inlet temperature from the second performance data set according to an energy efficiency optimal principle, so as to control the operation of the variable-frequency screw unit based on the target unit load.
2. 2. The control method of a variable frequency screw machine according to claim 1, wherein selecting a target chilled water outlet temperature matching the current chilled water inlet temperature from a first performance dataset according to an energy efficiency optimization principle comprises: Selecting a first data set to be selected, which is matched with the current cooling water inlet temperature, from the first performance data set, wherein the first data set to be selected characterizes the performance data of the variable-frequency screw unit at the current cooling water inlet temperature and different chilled water outlet temperatures; And selecting the chilled water outlet temperature with the highest performance data from the first data set to be selected as the target chilled water outlet temperature.
3. 3. The control method of a variable frequency screw machine according to claim 1, wherein selecting a target chilled water outlet temperature matching the current chilled water inlet temperature from a first performance dataset according to an energy efficiency optimization principle comprises: acquiring a preset range of the chilled water temperature; Selecting a second data set to be selected, which is matched with the current cooling water inlet temperature and the chilled water temperature preset range, from the first performance data set, wherein the second data set to be selected characterizes the performance data of the variable-frequency screw unit at different chilled water outlet temperatures in the current cooling water inlet temperature and the chilled water temperature preset range; And selecting the chilled water outlet temperature with the highest performance data from the second data set to be selected as the target chilled water outlet temperature.
4. 4. The control method of a variable frequency screw machine according to claim 1, wherein the selecting a target unit load of the variable frequency screw unit matching the current cooling water inlet temperature from the second performance data set according to an energy efficiency optimization principle includes: Selecting a third to-be-selected data set matched with the current cooling water inlet temperature from the second performance data set, wherein the third to-be-selected data set represents performance data of the variable frequency screw unit under the current cooling water inlet temperature and different unit loads; and selecting the unit load with the highest performance data from the third data set to be selected as the target unit load.
5. 5. The control method of a variable frequency screw machine according to claim 1, wherein the controlling the variable frequency screw machine operation based on the target machine set load includes: the method comprises the steps of obtaining total target load and the number of units, wherein the number of units represents the number of variable-frequency screw units in the variable-frequency screw machine; judging whether the number of the units is larger than or equal to a number threshold; and when the number of the variable-frequency screw units is greater than or equal to the number threshold, distributing the load of each variable-frequency screw unit in the variable-frequency screw machine based on the total target load and the target unit load to obtain the unit load of each variable-frequency screw unit in the variable-frequency screw machine, and correspondingly controlling the operation of each variable-frequency screw unit based on the unit load of each variable-frequency screw unit.
6. 6. The control method of variable frequency screw machines according to claim 5, wherein the distributing the load of each variable frequency screw machine set in the variable frequency screw machine based on the total target load and the target set load to obtain the set load of each variable frequency screw machine set in the variable frequency screw machine comprises: Selecting at least one variable-frequency screw unit in the variable-frequency screw machines as a target unit, and determining the unit load of the target unit as the target unit load; And determining the unit loads of other variable-frequency screw units in the variable-frequency screw machine based on the total target load and the target unit load of the target unit.
7. 7. The control method of a variable frequency screw machine according to claim 5, wherein after the determining whether the number of units is greater than or equal to a number threshold, the method further comprises: And when the number of the units is smaller than the number threshold, determining the unit load of each variable-frequency screw unit in the variable-frequency screw machine based on the total target load.
8. 8. The utility model provides a controlling means of variable frequency screw rod machine, its characterized in that, variable frequency screw rod machine includes at least one variable frequency screw rod unit, controlling means of variable frequency screw rod machine includes: The data acquisition module is used for acquiring the current cooling water inlet temperature of the variable-frequency screw unit; The water temperature matching module is used for selecting a target chilled water outlet temperature matched with the current cooling water inlet temperature from a first performance data set according to an energy efficiency optimal principle, wherein the first performance data set represents performance data of the variable-frequency screw unit at different cooling water inlet temperatures and different chilled water outlet temperatures; The data matching module is used for matching a second performance data set according to the target chilled water outlet temperature, wherein the second performance data set represents performance data of the variable-frequency screw unit at different cooling water inlet temperatures and different unit loads; and the load matching module is used for selecting a target unit load of the variable-frequency screw unit matched with the current cooling water inlet temperature from the second performance data set according to an energy efficiency optimal principle so as to control the variable-frequency screw unit to operate based on the target unit load.
9. 9. An air conditioner characterized by comprising one or more processors, a memory, and one or more application programs, wherein the one or more application programs are stored in the memory and configured to be executed by the processor to implement the control method of the variable frequency screw machine of any one of claims 1 to 7.
10. 10. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program is loaded by a processor to perform the steps in the control method of a variable frequency screw machine according to any one of claims 1 to 7.

Description

Control method and device of variable-frequency screw machine, air conditioner and storage medium Technical Field The application relates to the technical field of air conditioner control, in particular to a control method and device of a variable-frequency screw machine, an air conditioner and a storage medium. Background The control system of the variable-frequency screw unit at present usually takes the chilled water outlet temperature as a core target, and the chilled water outlet temperature is stabilized at the target temperature by adjusting the load or frequency of a compressor. To reduce energy consumption, some schemes simply correct the target temperature (e.g., fixedly up-regulate by 1 ℃). In practice, this simple modification results in a limited energy efficiency improvement. And secondly, the load or the frequency of the compressor is regulated only by relying on single water temperature feedback, the optimal operating point of the unit cannot be maintained under different working conditions, and the energy efficiency is low. Disclosure of Invention The embodiment of the application provides a control method and device of a variable-frequency screw machine, an air conditioner and a storage medium, which can improve the energy efficiency of the variable-frequency screw machine set and reduce the operation energy consumption. In a first aspect, an embodiment of the present application provides a control method of a variable-frequency screw machine, where the variable-frequency screw machine includes at least one variable-frequency screw unit, and the control method of the variable-frequency screw machine includes: acquiring the current cooling water inlet temperature of the variable-frequency screw unit; Selecting a target chilled water outlet temperature matched with the current cooling water inlet temperature from a first performance data set according to an energy efficiency optimal principle, wherein the first performance data set represents performance data of the variable-frequency screw unit at different cooling water inlet temperatures and different chilled water outlet temperatures; Matching a second performance data set according to the target chilled water outlet temperature, wherein the second performance data set represents performance data of the variable-frequency screw unit under different cooling water inlet temperatures and different unit loads; and selecting a target unit load of the variable-frequency screw unit matched with the current cooling water inlet temperature from the second performance data set according to an energy efficiency optimal principle, so as to control the operation of the variable-frequency screw unit based on the target unit load. In some embodiments, the selecting a target chilled water outlet temperature from the first performance dataset that matches the current chilled water inlet temperature according to an energy efficiency optimization principle includes: Selecting a first data set to be selected, which is matched with the current cooling water inlet temperature, from the first performance data set, wherein the first data set to be selected characterizes the performance data of the variable-frequency screw unit at the current cooling water inlet temperature and different chilled water outlet temperatures; And selecting the chilled water outlet temperature with the highest performance data from the first data set to be selected as the target chilled water outlet temperature. In some embodiments, the selecting a target chilled water outlet temperature from the first performance dataset that matches the current chilled water inlet temperature according to an energy efficiency optimization principle includes: acquiring a preset range of the chilled water temperature; Selecting a second data set to be selected, which is matched with the current cooling water inlet temperature and the chilled water temperature preset range, from the first performance data set, wherein the second data set to be selected characterizes the performance data of the variable-frequency screw unit at different chilled water outlet temperatures in the current cooling water inlet temperature and the chilled water temperature preset range; And selecting the chilled water outlet temperature with the highest performance data from the second data set to be selected as the target chilled water outlet temperature. In some embodiments, the selecting, according to an energy efficiency optimization principle, a target unit load of the variable frequency screw unit matched with the current cooling water inlet temperature from the second performance data set includes: Selecting a third to-be-selected data set matched with the current cooling water inlet temperature from the second performance data set, wherein the third to-be-selected data set represents performance data of the variable frequency screw unit under the current cooling water inlet temperature and different unit loads; and se