CN112762586A - Frequency correction control method for parallel multi-split compressor - Google Patents
Frequency correction control method for parallel multi-split compressor Download PDFInfo
- Publication number
- CN112762586A CN112762586A CN202110083540.0A CN202110083540A CN112762586A CN 112762586 A CN112762586 A CN 112762586A CN 202110083540 A CN202110083540 A CN 202110083540A CN 112762586 A CN112762586 A CN 112762586A
- Authority
- CN
- China
- Prior art keywords
- frequency
- compressor
- temperature difference
- control method
- correction control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
Abstract
The invention discloses a frequency correction control method for parallel multi-connected compressors, wherein each compressor respectively performs frequency increasing/reducing/maintaining operation on each frequency on the basis of initial operation frequency based on a temperature difference value delta T between exhaust temperature Tp and an exhaust temperature average value Te, wherein any compressor performs frequency increasing/reducing/maintaining operation on the frequency, the frequency increasing frequency and the frequency reducing frequency are accumulated and calculated in each frequency adjusting operation, and when the accumulated frequency increasing frequency or frequency reducing frequency reaches preset accumulated frequency, the compressor does not calculate and judge the temperature difference value delta T and maintains the current frequency to operate; the bias current is effectively reduced, the heat exchange efficiency of the system is improved, the operation efficiency is improved, and the operation reliability of the system is improved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a frequency correction control method for a parallel multi-split compressor.
Background
The frequency of the multi-connected unit of the existing module type is required by the distribution of a host, the multi-connected unit is adjusted respectively, the capacity of the unit in a parallel system is different in size, the installation positions are different, the pipe diameter size difference and the heat exchanger filth blocking degree are different, and the problem of uneven distribution inevitably exists to a certain degree, so that the exhaust superheat degree deviation is large, the exhaust temperature frequency limit even occurs, the distribution of the refrigerant oil is uneven, and the heat exchange effect cannot be brought into full play.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a frequency correction control method of a parallel multi-split compressor.
In order to achieve the above object, the present invention provides a frequency correction control method for a parallel multi-split compressor, wherein the multi-split compressor comprises at least two compressors operating in parallel, and the frequency correction control method comprises the following steps:
s1, after the multi-split air conditioner is started and operates stably, monitoring and obtaining the initial exhaust temperature Tp and the initial operation frequency of each compressor, and calculating to obtain an initial exhaust temperature average value Te;
s2, each compressor respectively performs first frequency increasing/frequency reducing/maintaining operation on each frequency on the basis of the initial operation frequency based on the temperature difference value delta T between the initial exhaust temperature Tp and the exhaust temperature average value Te;
s3, after the first frequency adjustment operation, monitoring and obtaining the exhaust temperature Tp of the first compressor at equal intervals and calculating to obtain a current exhaust temperature average value Te so as to correspondingly carry out frequency increasing/frequency decreasing/maintaining operation on the frequency of each compressor according to the temperature difference value delta T between each exhaust temperature Tp and the current exhaust temperature average value Te, wherein any compressor accumulates and calculates the frequency increasing frequency and the frequency decreasing frequency during each frequency adjustment operation, and when the accumulated frequency increasing frequency or frequency decreasing frequency reaches the preset accumulated frequency, the compressor does not calculate and judge the temperature difference value delta T and maintains the current frequency operation.
Further, when the temperature difference value delta T between the exhaust temperature Tp and the exhaust temperature average value Te is smaller than a first preset temperature difference, the compressor is in frequency increasing operation; when the temperature difference value delta T between the air temperature Tp and the exhaust temperature average value Te is larger than a second preset temperature difference, the compressor performs frequency reduction operation; when the temperature difference value delta T between the air temperature Tp and the exhaust temperature average value Te is between a first preset temperature difference and a second preset temperature difference, the compressor is in maintenance operation; the first preset temperature difference is smaller than the second preset temperature difference.
Further, the frequency of the compressor is 2Hz/2min every time the compressor is in frequency reduction operation.
Further, the frequency raising frequency of the compressor is 2Hz/2min every time the compressor is in frequency raising operation.
Further, the first preset temperature difference is-5 ℃.
Further, the second preset temperature difference is 5 ℃.
Further, the preset accumulation frequency is 10 Hz.
Further, in step S2, the discharge temperature Tp of the compressor is obtained once every 2min monitoring and the current discharge temperature average Te is calculated.
Further, in step S1, after the multi-split air conditioner is started for 30min, it is determined that the operation steady state is reached.
The invention adopts the scheme, and has the beneficial effects that: each compressor is judged based on the temperature difference value delta T between the exhaust temperature Tp and the exhaust temperature average value Te, so that the first frequency increasing/reducing/maintaining operation is carried out on each compressor, the frequency is reduced when the temperature difference value delta T is high, and the frequency is increased when the temperature difference value delta T is low, so that the output capacity of each compressor is corrected, the operating frequency is in a proper range, the bias current is reduced, the heat exchange efficiency of a system is improved, the operating efficiency is improved, and the reliability of the operation of the system is improved.
Drawings
Fig. 1 is a flowchart of a correction control method.
Detailed Description
To facilitate an understanding of the invention, the invention is described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete.
Referring to fig. 1, in the present embodiment, a frequency correction control method for a parallel multi-split compressor is applied to a compressor having at least two compressors operating in parallel. The frequency correction control method comprises the following steps:
s1, after the multi-split air conditioner is started and operates stably, the initial exhaust temperature Tp and the initial operation frequency of each compressor are monitored and obtained, and the initial exhaust temperature average value Te is obtained through calculation. Specifically, the exhaust temperature average Te is an average of the respective exhaust temperatures Tp.
S2, each compressor performs first frequency increasing/frequency decreasing/maintaining operation on each frequency on the basis of the initial operation frequency respectively on the basis of the temperature difference value delta T between the initial exhaust temperature Tp and the exhaust temperature average value Te. Specifically, the temperature difference value Δ T = TP-Te in step S2.
S3, after the first frequency adjustment operation, monitoring and obtaining the exhaust temperature Tp of the first compressor at equal intervals and calculating to obtain a current exhaust temperature average value Te so as to correspondingly carry out frequency increasing/frequency decreasing/maintaining operation on the frequency of each compressor according to the temperature difference value delta T between each exhaust temperature Tp and the current exhaust temperature average value Te, wherein any compressor accumulates and calculates the frequency increasing frequency and the frequency decreasing frequency during each frequency adjustment operation, and when the accumulated frequency increasing frequency or frequency decreasing frequency reaches the preset accumulated frequency, the compressor does not calculate and judge the temperature difference value delta T and maintains the current frequency operation.
Further, the present embodiment judges by dividing three ranges for the comparison of the temperature difference value Δ T in steps S2 and S3, specifically, 1) when the temperature difference value Δ T of the discharge temperature Tp and the discharge temperature average Te is less than a first preset temperature difference (preferably Te < -5 ℃), the compressor is operated at an increased frequency; 2) when the temperature difference delta T between the air temperature Tp and the exhaust temperature average Te is larger than a second preset temperature difference (Te is preferably larger than or equal to 5 ℃), the compressor performs frequency reduction operation; 3) when the temperature difference DeltaT between the air temperature Tp and the average value Te of the exhaust temperature is between the first preset temperature difference and the second preset temperature difference (preferably-5 ℃ to Te < 5 ℃), the compressor is maintained to be operated.
Further, the first preset temperature difference is smaller than a second preset temperature difference, wherein the first preset temperature difference is-5 ℃. The second preset temperature difference is 5 ℃.
In this embodiment, in step S3, the up-conversion frequency and the down-conversion frequency of each frequency adjustment operation of any one compressor are respectively calculated in an accumulating manner, so as to limit the frequency correction of the compressor within a frequency range in which the compressor can stably operate, and avoid the influence of the over-adjustment of the frequency of the compressor on the normal operation of the multi-split air conditioner. The preset accumulation frequency of the embodiment is 10Hz, wherein when the accumulated ascending frequency or descending frequency reaches 10Hz, the frequency of the compressor is not corrected, and the compressor keeps the current frequency to operate continuously.
In the present embodiment, in step S2, the discharge temperature Tp of the compressor is acquired once every 2min monitoring and the current discharge temperature average Te is calculated.
In the present embodiment, in step S1, after the multi-split air conditioner starts to operate for 30min, it is determined that the operation steady state is reached.
Further, the frequency of the compressor is 2Hz/2min every time the compressor is in frequency reduction operation. The frequency raising frequency of the compressor is 2Hz/2min every time the compressor is in frequency raising operation.
The above-described embodiments are merely preferred embodiments of the present invention, which is not intended to limit the present invention in any way. Those skilled in the art can make many changes, modifications, and equivalents to the embodiments of the invention without departing from the scope of the invention as set forth in the claims below. Therefore, equivalent changes made according to the spirit of the present invention should be covered within the protection scope of the present invention without departing from the contents of the technical scheme of the present invention.
Claims (9)
1. A frequency correction control method for a parallel multi-connected compressor, which is provided with at least two compressors running in parallel, is characterized in that: the frequency correction control method comprises the following steps:
s1, after the multi-split air conditioner is started and operates stably, monitoring and obtaining the initial exhaust temperature Tp and the initial operation frequency of each compressor, and calculating to obtain an initial exhaust temperature average value Te;
s2, each compressor respectively performs first frequency increasing/frequency reducing/maintaining operation on each frequency on the basis of the initial operation frequency based on the temperature difference value delta T between the initial exhaust temperature Tp and the exhaust temperature average value Te;
s3, after the first frequency adjustment operation, monitoring and obtaining the exhaust temperature Tp of the first compressor at equal intervals and calculating to obtain a current exhaust temperature average value Te so as to correspondingly carry out frequency increasing/frequency decreasing/maintaining operation on the frequency of each compressor according to the temperature difference value delta T between each exhaust temperature Tp and the current exhaust temperature average value Te, wherein any compressor accumulates and calculates the frequency increasing frequency and the frequency decreasing frequency during each frequency adjustment operation, and when the accumulated frequency increasing frequency or frequency decreasing frequency reaches the preset accumulated frequency, the compressor does not calculate and judge the temperature difference value delta T and maintains the current frequency operation.
2. The frequency correction control method of the parallel multi-split compressor according to claim 1, wherein: when the temperature difference value delta T between the exhaust temperature Tp and the exhaust temperature average value Te is smaller than a first preset temperature difference, the compressor is subjected to frequency increasing operation; when the temperature difference value delta T between the air temperature Tp and the exhaust temperature average value Te is larger than a second preset temperature difference, the compressor performs frequency reduction operation; when the temperature difference value delta T between the air temperature Tp and the exhaust temperature average value Te is between a first preset temperature difference and a second preset temperature difference, the compressor is in maintenance operation; the first preset temperature difference is smaller than the second preset temperature difference.
3. The frequency correction control method of the parallel multi-split compressor according to claim 2, wherein: the frequency reduction frequency of the compressor is 2Hz/2min every time the compressor performs frequency reduction operation.
4. The frequency correction control method of the parallel multi-split compressor according to claim 2, wherein: the frequency raising frequency of the compressor is 2Hz/2min every time the compressor is in frequency raising operation.
5. The frequency correction control method of the parallel multi-split compressor according to claim 1, wherein: the first preset temperature difference is-5 ℃.
6. The frequency correction control method of the parallel multi-split compressor according to claim 1, wherein: the second preset temperature difference is 5 ℃.
7. The frequency correction control method of the parallel multi-split compressor according to claim 1, wherein: the preset accumulation frequency is 10 Hz.
8. The frequency correction control method of the parallel multi-split compressor according to claim 1, wherein: in step S2, the discharge temperature Tp of the compressor is acquired every 2min monitoring and the current discharge temperature average Te is calculated.
9. The frequency correction control method of the parallel multi-split compressor according to claim 1, wherein: in step S1, after the multi-split air conditioner is started for 30min, it is determined that the steady operation state is reached.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110083540.0A CN112762586A (en) | 2021-01-21 | 2021-01-21 | Frequency correction control method for parallel multi-split compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110083540.0A CN112762586A (en) | 2021-01-21 | 2021-01-21 | Frequency correction control method for parallel multi-split compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112762586A true CN112762586A (en) | 2021-05-07 |
Family
ID=75703575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110083540.0A Pending CN112762586A (en) | 2021-01-21 | 2021-01-21 | Frequency correction control method for parallel multi-split compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112762586A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06347115A (en) * | 1993-06-08 | 1994-12-20 | Matsushita Refrig Co Ltd | Cooling control device for multi-chamber type air conditioner |
| CN107356444A (en) * | 2017-06-14 | 2017-11-17 | 青岛海尔空调器有限总公司 | Method of testing and test system for transducer air conditioning |
| CN107477934A (en) * | 2017-09-18 | 2017-12-15 | 广东美的暖通设备有限公司 | Control method, system and the computer-readable recording medium of multi-connected air conditioner |
| CN107576109A (en) * | 2017-08-23 | 2018-01-12 | 珠海格力电器股份有限公司 | The control method and heat pump of heat pump |
| CN107655166A (en) * | 2017-09-18 | 2018-02-02 | 广东美的暖通设备有限公司 | Control method, system and the computer-readable recording medium of multi-connected air conditioner |
| CN107676933A (en) * | 2017-09-18 | 2018-02-09 | 广东美的暖通设备有限公司 | Control method, system and the computer-readable recording medium of multi-connected air conditioner |
| CN108361924A (en) * | 2018-01-04 | 2018-08-03 | 青岛海尔空调器有限总公司 | Air conditioner control method for frequency |
| CN110513903A (en) * | 2019-08-14 | 2019-11-29 | 青岛海信日立空调系统有限公司 | A kind of control method of cooling cycle system |
-
2021
- 2021-01-21 CN CN202110083540.0A patent/CN112762586A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06347115A (en) * | 1993-06-08 | 1994-12-20 | Matsushita Refrig Co Ltd | Cooling control device for multi-chamber type air conditioner |
| CN107356444A (en) * | 2017-06-14 | 2017-11-17 | 青岛海尔空调器有限总公司 | Method of testing and test system for transducer air conditioning |
| CN107576109A (en) * | 2017-08-23 | 2018-01-12 | 珠海格力电器股份有限公司 | The control method and heat pump of heat pump |
| CN107477934A (en) * | 2017-09-18 | 2017-12-15 | 广东美的暖通设备有限公司 | Control method, system and the computer-readable recording medium of multi-connected air conditioner |
| CN107655166A (en) * | 2017-09-18 | 2018-02-02 | 广东美的暖通设备有限公司 | Control method, system and the computer-readable recording medium of multi-connected air conditioner |
| CN107676933A (en) * | 2017-09-18 | 2018-02-09 | 广东美的暖通设备有限公司 | Control method, system and the computer-readable recording medium of multi-connected air conditioner |
| CN108361924A (en) * | 2018-01-04 | 2018-08-03 | 青岛海尔空调器有限总公司 | Air conditioner control method for frequency |
| CN110513903A (en) * | 2019-08-14 | 2019-11-29 | 青岛海信日立空调系统有限公司 | A kind of control method of cooling cycle system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111692736B (en) | Control method of electronic expansion valve and air conditioning system | |
| US9206994B2 (en) | Heat source system | |
| CN109425069B (en) | Control method for electronic expansion valve during heating | |
| CN111520894B (en) | Output control method and device for air conditioner compressor, air conditioner and storage medium | |
| CN109855256B (en) | Air conditioning system evaporation temperature control method and device and air conditioning system | |
| CN111306698A (en) | Air conditioner control method and device and air conditioner | |
| CN109539493A (en) | Air-conditioner outdoor unit control method, device and air conditioner | |
| CN107560079B (en) | Control method and device for preventing frosting and air conditioner | |
| CN113587353B (en) | Control method for oil return of multi-split air conditioning system | |
| US9835341B2 (en) | Air conditioner | |
| CN109869873B (en) | Condensing fan rotating speed control method and air conditioning system | |
| CN112762586A (en) | Frequency correction control method for parallel multi-split compressor | |
| CN114234383A (en) | Air conditioner control method and device | |
| CN107726568B (en) | Control method and system of air conditioner and air conditioner | |
| CN113983643B (en) | Control method of air conditioner | |
| CN114413410B (en) | Multi-split air conditioner system | |
| CN111397133A (en) | Control method of multi-split air conditioner | |
| CN114811860B (en) | Control method of multi-split air conditioning system and multi-split air conditioning system | |
| CN113483447B (en) | Multi-connected variable frequency air conditioner compressor frequency control method and air conditioner | |
| JPWO2020003490A1 (en) | Air conditioner | |
| CN110726207B (en) | Multi-system air conditioner control method and device | |
| CN113959069A (en) | Air conditioning system | |
| KR101551973B1 (en) | Air Conditioning System for Vehicle Using a Electronic Expasion Valve | |
| JPH10318615A (en) | Operation control device of air-conditioning equipment | |
| CN117450623B (en) | Compressor frequency control method and air conditioning unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210507 |