CN114413456B - Group control method and equipment for chilled water system of central air conditioner - Google Patents
Group control method and equipment for chilled water system of central air conditioner Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 161
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000005259 measurement Methods 0.000 claims description 11
- 238000004590 computer program Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- 239000000523 sample Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 238000012937 correction Methods 0.000 claims description 3
- HOWHQWFXSLOJEF-MGZLOUMQSA-N systemin Chemical compound NCCCC[C@H](N)C(=O)N[C@@H](CCSC)C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@@H]([C@@H](C)O)C(=O)N[C@@H](CC(O)=O)C(=O)OC(=O)[C@@H]1CCCN1C(=O)[C@H]1N(C(=O)[C@H](CC(O)=O)NC(=O)[C@H](CCCN=C(N)N)NC(=O)[C@H](CCCCN)NC(=O)[C@H](CO)NC(=O)[C@H]2N(CCC2)C(=O)[C@H]2N(CCC2)C(=O)[C@H](CCCCN)NC(=O)[C@H](CO)NC(=O)[C@H](CCC(N)=O)NC(=O)[C@@H](NC(=O)[C@H](C)N)C(C)C)CCC1 HOWHQWFXSLOJEF-MGZLOUMQSA-N 0.000 claims 1
- 108010050014 systemin Proteins 0.000 claims 1
- 230000001276 controlling effect Effects 0.000 description 15
- 238000013461 design Methods 0.000 description 15
- 238000004378 air conditioning Methods 0.000 description 8
- 238000005057 refrigeration Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
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- 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
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- 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
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- 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
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- 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
- F24F11/88—Electrical aspects, e.g. circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The application discloses a group control method and equipment of a chilled water system of a central air conditioner, comprising the steps of setting a target control value ST and an allowable deviation value DT of the chilled water system; finding all of the Q unlocked compressors from the M compressors, and finding the compressor C with the shortest running time k C is carried out by k Is of the host U k As a target control unit, the host U is started k Is a water pump P of (2) k The method comprises the steps of carrying out a first treatment on the surface of the Acquiring the total backwater temperature or the total outlet water temperature of the chilled water system, and obtaining a metering value CT according to the total backwater temperature or the total outlet water temperature; according to the numerical relation between the measured value CT and the target control value ST and the deviation value DT, the loading or unloading of the Q compressors is determined. According to the application, the compressors in the system are loaded or unloaded according to the numerical relation between the metering value CT and the target control value ST and the deviation value DT, so that the group control automation of the chilled water system of the central air conditioner is realized, the balanced operation among the compressors and the balanced operation among the water pumps are ensured, and the running stability of the system is improved.
Description
Technical Field
The application belongs to the technical field of central air conditioner group control, and particularly relates to a group control method and equipment for a chilled water system of a central air conditioner.
Background
The central air-conditioning group control system enables the building system to have the capability of sensing the temperature of a human body, and can realize the control of the group control cold (hot) water unit based on different temperatures, time and requirements. In a central air conditioning system, the capacities of the refrigeration main unit, chilled water pump, cooling tower fan and end units are selected according to the maximum load of the building, with a margin of 10% to 15% being left, so that the system operates at a fixed maximum water flow and maximum air volume for a long period throughout the year. However, due to variations in seasons, day and night and user loads, the actual load of the central air conditioner is much lower than the design load for most of the time. Therefore, the central air-conditioning group control system is necessary to be regulated, so that the stable energy-saving operation of the system is realized.
The traditional central air-conditioning group control method judges the change condition of the air-conditioning load by a manual mode, and manually adds and subtracts a host machine and adjusts the operation of auxiliary equipment according to the load change. However, manual adjustment is often not timely and accurate enough, so that the air conditioning unit can not always operate in an efficient and energy-saving mode, and the group control efficiency is low. With the development of technology, a method for realizing stable energy-saving operation of a group control system by adjusting balanced operation among compressors also appears, but the method does not consider the operation condition among water pumps, so that fault events of the water pumps are frequent in the operation process.
Disclosure of Invention
The application aims to provide a group control method and equipment for a chilled water system of a central air conditioner, which are used for solving at least one technical problem in the prior art.
In order to achieve the above purpose, the present application adopts the following technical scheme:
in a first aspect, the present application provides a group control method for a chilled water system of a central air conditioner, comprising:
setting a target control value ST and an allowable deviation value DT of a chilled water system, wherein the chilled water system comprises N hosts and M compressors, and each host is correspondingly provided with a chilled water pump and a plurality of compressors;
from M compressors C 1,2,...,M Find all the Q compressors C that are not locked 1,2,...,Q And from Q compressors C 1,2,...,Q Finding the compressor C with the shortest running time k The compressor C is subjected to k Corresponding host U k As a target control unit and starts the host U k Is a chilled water pump P of (1) k ；
Acquiring the total backwater temperature or the total outlet water temperature of the chilled water system, and obtaining a metering value CT according to the total backwater temperature or the total outlet water temperature;
according to the metering value CT, the target control value ST and the deviationNumerical relation between values DT, controlling Q compressors C by the target control unit 1,2,...,Q Loading or unloading is performed.
In one possible design, obtaining the total backwater temperature of the chilled water system and obtaining the measured value CT according to the total backwater temperature includes:
by being arranged on the host U k The return water temperature probe on the main machine U is used for collecting the main machine U k And return water temperature of the host U k Is used as the total backwater temperature of the chilled water system, and the total backwater temperature is recorded as a first measurement value CT 1 。
In one possible design, obtaining the total outlet water temperature of the chilled water system and obtaining the measured value CT from the total outlet water temperature includes:
the water outlet temperature probe arranged on each unit is utilized to respectively collect the water outlet temperature of each unit; wherein,,
when Q compressors C 1,2,...,Q When neither is started, the host U k The sum of the water outlet temperature of (1) and the deviation value DT is used as a second measurement value CT 2 ；
When a plurality of Q compressors are started, calculating to obtain a third measurement value CT according to the water outlet temperature Ti, the total load ratio Ai and/or the flow correction coefficient Bi of each unit corresponding to the started compressors 3 The calculation formula is as follows:
CT 3 ＝Σ(Ai*Ti)；
alternatively, CT 3 ＝Σ(Ai*Bi*Ti)。
In one possible design, the target control unit is used to control Q compressors C based on the numerical relationship between the metering value CT and the target control value ST and the deviation value DT 1,2,...,Q Loading or unloading is performed, including:
setting a numerical relationship between the metering value CT and the target control value ST and the deviation value DT as a capacity loading command execution condition or a capacity unloading command execution condition;
when the capability loading command execution condition is satisfied, turning onControlling Q compressors C by the target control unit 1,2,...,Q Executing a capability loading command;
when the capacity relief command execution condition is satisfied, controlling Q compressors C by the target control unit 1,2,...,Q The capacity offload command is executed.
In one possible design, the capacity loading command execution condition is CT during the refrigerating process of the chilled water system 1 ＞ST+DT、CT 2 +DT > ST or CT 3 +DT > ST, the capacity relief command execution condition is CT 1 ＜ST-DT、CT 2 +DT < ST or CT 3 +DT＜ST；
In the heating process of the chilled water system, the capacity loading command execution condition is CT 1 ＜ST-DT、CT 2 +DT < ST or CT 3 +DT < ST, the capacity relief order execution condition is CT 1 ＞ST+DT、CT 2 +DT > ST or CT 3 +DT＞ST。
In one possible design, Q compressors C are controlled by the target control unit 1,2,...,Q Executing a capability load command, comprising:
(1) The target control unit is arranged in Q compressors C according to the following priority order 1,2,...,Q Searching for a target compressor, comprising:
at Q compressors C 1,2,...,Q Searching for a compressor C which is not fully loaded or not started and has the shortest running time s The method comprises the steps of carrying out a first treatment on the surface of the Or alternatively
Preferential to the host U k Searching for a compressor C which is not fully loaded or not started and has the shortest running time i If the compressor C cannot be found i Searching for a compressor C which is not fully loaded or is not started and has the shortest running time in the unlocked compressors except the Uk host a ；
(2) Controlling the searched target compressor execution capacity loading command, which comprises the following steps:
and each time the capacity loading command execution condition is met, controlling the target compressor to execute the capacity loading command once.
In one possible design, by the followingTarget control unit controls Q compressors C 1,2,...,Q Executing a capacity offload command, comprising:
(1) The target control unit is arranged in Q compressors C according to the following priority order 1,2,...,Q Searching for a target compressor, comprising:
at Q compressors C 1,2,...,Q Searching for the compressor C which is already running and has the longest running time v The method comprises the steps of carrying out a first treatment on the surface of the Or alternatively
Preferential to the host U k Searching for the compressor C which is operated and has the longest operation time in other hosts b If the compressor C cannot be found b Then searching the Uk host for the compressor C which is already running and has the longest running time j ；
(2) And controlling the target compressor execution capacity load shedding command obtained by searching, which comprises the following steps:
and each time the capacity load shedding command execution condition is met, controlling the target compressor to execute the capacity load shedding command once.
In one possible design, the method further comprises:
at the opposite host U k Before the compressor of some other host machine is loaded, starting the chilled water pump of the host machine;
at host U k After the compressors of some other host are all turned off, the chilled water pump of that host is turned off at a certain time.
In one possible design, the method further comprises:
when Q compressors C of N hosts 1,2,...,Q After all are closed, searching new host U in N hosts L As a new target control unit;
wherein, when U L ≠U k When the host U is started L Is a chilled water pump P of (1) L And at the chilled water pump P L Running the chilled water pump P after the running time reaches a set time threshold k Closing; when U is L ＝U k Holding the chilled water pump P k And opening.
In a second aspect, the present application provides a computer device comprising a memory, a processor and a transceiver in communication with each other in sequence, wherein the memory is configured to store a computer program, the transceiver is configured to send and receive messages, and the processor is configured to read the computer program and perform a group control method of a chilled water system of a central air conditioner as described in any one of the possible designs of the first aspect.
In a third aspect, the present application provides a computer readable storage medium having instructions stored thereon which, when executed on a computer, perform a group control method of a chilled water system of a central air conditioner as described in any one of the possible designs of the first aspect.
In a fourth aspect, the application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform a group control method of a chilled water system of a central air conditioner as described in any one of the possible designs of the first aspect.
Has the beneficial effects that;
the application is realized by finding Q compressors which are not locked out of M compressors, and then finding the compressor C with the shortest running time from the Q compressors k The compressor C k Corresponding host U k As a target control unit and starts the host U k Is a chilled water pump P of (1) k Then obtaining a metering value CT according to the total backwater temperature or the total outlet water temperature of the system, and controlling Q compressors C by the target control unit according to the numerical relation between the metering value CT and the target control value ST and the deviation value DT 1,2,...,Q Loading or unloading is performed. The application realizes the balanced operation among the compressors by acquiring the operation time of the compressors in each host and loading or unloading the compressors in each host according to the operation time of the compressors; in addition, at least one chilled water pump is kept on in the loading or unloading process, so that the formation of dead water in a water supply pipeline can be avoided, and the real-time acquisition of data is realized; in addition, after the new target control unit is determined, the chilled water pump corresponding to the new target control unit is started for a period of time, and then the chilled water pump of the original target control unit is closed, so that balanced operation among the chilled water pumps is realized, and avoidance of occurrence of the phenomenon is realizedThe running time of a certain chilled water pump is overlong and the chilled water pump fails, so that the service life of the whole chilled water system is prolonged.
Drawings
Fig. 1 is a flow chart of a group control method of a chilled water system of a central air conditioner in the embodiment;
fig. 2 is a schematic diagram of a connection relationship between a host and a chilled water pump in the present embodiment.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present specification more clear, the technical solutions of the embodiments of the present specification will be clearly and completely described below with reference to the drawings in the embodiments of the present specification, and it is apparent that the described embodiments are some embodiments of the present specification, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are intended to be within the scope of the present application based on the embodiments herein.
Examples
In order to solve the technical problem of low group control efficiency of a central air-conditioning chilled water system in the prior art, the embodiment of the application provides a group control method of the central air-conditioning chilled water system, which is characterized in that the compressors in all the hosts are loaded or unloaded according to the running time of the compressors by acquiring the running time of the compressors in all the hosts, so that balanced running among the compressors is realized; in addition, at least one chilled water pump is kept on in the loading or unloading process, so that the formation of dead water in a water supply pipeline can be avoided, and the real-time acquisition of data is realized; in addition, after the new target control unit is determined, the chilled water pump corresponding to the new target control unit is started for a period of time, and then the chilled water pump of the original target control unit is closed, so that balanced operation among the chilled water pumps and energy-saving operation of the system are realized, faults caused by overlong operation time of a certain chilled water pump are avoided, and the service life of the whole chilled water system is prolonged.
As shown in fig. 1 and 2, in a first aspect, the present embodiment provides a group control method of a chilled water system of a central air conditioner, including, but not limited to, implementation by steps S101 to S104:
s101, setting a target control value ST and an allowable deviation value DT of a chilled water system, wherein the chilled water system comprises N hosts and M compressors, and each host is correspondingly provided with a chilled water pump and a plurality of compressors;
in general, components of a chilled water system of a central air conditioner mainly include a water pipe system and various accessories, such as a pressure gauge, a thermometer, a valve, a filter, an exhaust valve, an expansion tank, a water replenishing system, and the like. The chilled water is a working medium for conveying the cold energy prepared by the evaporator to the tail end device of the air conditioner through a chilled water pump. As shown in fig. 2, the chilled water system designed in this embodiment includes N hosts and M compressors, and each host is provided with a chilled water pump and a plurality of compressors.
It should be noted that, the target control value ST refers to a total outlet water temperature or a total return water temperature preset by the system, for example, the total outlet water temperature of the chilled water of the central air conditioner is typically 7 ℃, and the total return water temperature is typically 12 ℃.
S102, slave M compressors C 1,2,...,M Find all the Q compressors C that are not locked 1,2,...,Q And from Q compressors C 1,2,...,Q Finding the compressor C with the shortest running time k The compressor C is subjected to k Corresponding host U k As a target control unit and starts the host U k Is a chilled water pump P of (1) k ；
It should be noted that, in this embodiment, each host communicates in a cascade manner, and 1 host is used as a master control machine, and other hosts are used as slave control machines; before one host is selected from the N hosts as the target control unit, each host needs to receive a startup instruction, for example, a user realizes startup through a switch button arranged on the host, or receives a startup instruction of an upper computer to realize startup, which is not particularly limited.
Here, the compressor that is not locked refers to a compressor that is not failed, is not locked for protection, or can normally operate. In order to accurately control the running state of the compressors in each host, the embodiment preferably regulates and controls only all the unlocked compressors in the system.
Wherein, the operation time refers to the total operation time of a certain compressor from the initial start-up to the present time, and the embodiment preferably obtains the compressor C with the shortest operation time k And compressor C k Corresponding host U k As a target control unit, the running time among the compressors can be balanced, and the chilled water system can be more stably and uniformly operated.
Preferably, if the running time of more than 2 compressors in the chilled water system is the shortest, the main machine is taken as the target control unit if the more than 2 compressors belong to the same main machine, and the main machine with the previous serial number is taken as the target control unit if the more than 2 compressors respectively belong to different main machines. For example, the running time of 2 compressors in the chilled water system is shortest, wherein one compressor corresponds to a No. 1 host, the other compressor corresponds to a No. 2 host, and the No. 1 host is used as a target control unit.
S103, acquiring the total backwater temperature or the total outlet water temperature of the chilled water system, and obtaining a measurement value CT according to the total backwater temperature or the total outlet water temperature;
in a specific embodiment of step S103, obtaining the total backwater temperature of the chilled water system, and obtaining the measurement CT according to the total backwater temperature, including:
by being arranged on the host U k The return water temperature probe on the main machine U is used for collecting the main machine U k And return water temperature of the host U k Is used as the total backwater temperature of the chilled water system, and the total backwater temperature is recorded as a first measurement value CT 1 。
In a specific embodiment of step S103, obtaining the total outlet water temperature of the chilled water system, and obtaining the measurement CT according to the total outlet water temperature includes:
the water outlet temperature probe arranged on each unit is utilized to respectively collect the water outlet temperature of each unit; wherein,,
when Q compressors C 1,2,...,Q When neither is started, the host U k The sum of the water outlet temperature of (1) and the deviation value DT is used as a second measurement value CT 2 ；
It should be noted that, at this time, the value of the deviation value DT may be 0, or may be a function expression, which may be specifically set according to an actual application scenario, and is not limited herein.
When a plurality of Q compressors are started, calculating to obtain a third measurement value CT according to the water outlet temperature Ti, the total load ratio Ai and/or the flow correction coefficient Bi of each unit corresponding to the started compressors 3 The calculation formula is as follows:
CT 3 ＝Σ(Ai*Ti)；
alternatively, CT 3 ＝Σ(Ai*Bi*Ti)。
For example, 10 hosts in a chilled water system run 20 compressors in total, if the first host runs only 1 compressor
S104, controlling Q compressors C by using the target control unit according to the numerical relation between the metering value CT and the target control value ST and the deviation value DT 1,2,...,Q Loading or unloading is performed.
In a specific embodiment of step S104, the target control unit is used to control Q compressors C according to the numerical relationship between the metering value CT and the target control value ST and the deviation value DT 1,2,...,Q Loading or unloading is performed, including:
step S1041, setting the numerical relation between the metering value CT and the target control value ST and the deviation value DT as a capacity loading command execution condition or a capacity unloading command execution condition;
specifically, in the refrigerating process of the chilled water system, the capacity loading command execution condition is CT 1 ＞ST+DT、CT 2 +DT > ST or CT 3 +DT > ST, the capacity relief command execution condition is CT 1 ＜ST-DT、CT 2 +DT < ST or CT 3 +DT＜ST；
In the refrigeration process, when the CT is performed 1 When the total backwater temperature is greater than ST+DT, the total backwater temperature of the system is larger than the sum of the target control value and the allowable deviation value, namely, the total backwater temperature is higher, and further refrigeration is needed, so that a capacity loading command needs to be executed; when CT 2 +DT > ST or CT 3 When +DT > ST, the total water outlet temperature of the system is larger than the target control value, namely the system does not reach the optimal refrigeration effect, so that the capacity loading command needs to be executed; when CT 1 When ST-DT is less than or equal to the target control value, the total backwater temperature of the system is smaller than the difference between the target control value and the allowable deviation value, namely, the total backwater temperature is lower, and the system is excessively refrigerated, so that the capacity load shedding command needs to be executed; when CT 2 +DT < ST or CT 3 When +DT < ST, the total outlet water temperature of the system is less than the target control value, i.e. the system is too cold, and therefore a capacity de-load command needs to be executed.
Specifically, in the heating process of the chilled water system, the capacity loading command execution condition is CT 1 ＜ST-DT、CT 2 +DT < ST or CT 3 +DT < ST, the capacity relief order execution condition is CT 1 ＞ST+DT、CT 2 +DT > ST or CT 3 +DT＞ST。
It should be noted that, when CT 1 When ST-DT is less than or equal to the target control value, the total backwater temperature of the system is smaller than the difference between the target control value and the allowable deviation value, namely, the total backwater temperature is lower, and the system does not reach the target heating effect, so that the capacity loading command needs to be executed; when CT 2 +DT < ST or CT 3 When +DT < ST, the total water outlet temperature of the system is smaller than the target control value, namely the system does not reach the target heating effect, so that the capacity loading command needs to be executed; when CT 1 When the total backwater temperature of the system is greater than the sum of the target control value and the allowable deviation value, namely the total backwater temperature of the system is higher, the system heats too much, so that the capacity load shedding command needs to be executed; when CT 2 +DT > ST or CT 3 When +DT > ST, the total water outlet temperature of the system is larger than the target control value, namely the system is too much heated, so that the capacity relief command needs to be executed.
Step S1042, when the capacity loading command execution condition is satisfied, controlling Q compressors C by the target control unit 1,2,...,Q Executing a capability loading command;
in a specific embodiment of step S1042, Q compressors C are controlled by the target control unit 1,2,...,Q Executing a capability load command, comprising:
(1) The target control unit is arranged in Q compressors C according to the following priority order 1,2,...,Q Searching for a target compressor, comprising:
at Q compressors C 1,2,...,Q Searching for a compressor C which is not fully loaded or not started and has the shortest running time s The method comprises the steps of carrying out a first treatment on the surface of the Or alternatively
Preferential to the host U k Searching for a compressor C which is not fully loaded or not started and has the shortest running time i If the compressor C cannot be found i Searching for a compressor C which is not fully loaded or is not started and has the shortest running time in the unlocked compressors except the Uk host a ；
(2) Controlling the searched target compressor execution capacity loading command, which comprises the following steps:
and each time the capacity loading command execution condition is met, controlling the target compressor to execute the capacity loading command once.
It can be seen that in this embodiment, the target control unit controls Q compressors C 1,2,...,Q There are two ways to execute the capability load command, specifically as follows:
one is in all Q compressors C 1,2,...,Q Searching for a compressor C which is not fully loaded or not started and has the shortest running time s Control the compressor C every time the capacity loading command execution condition is satisfied s Executing a capacity loading command once, when the compressor C s After being loaded to full load, the other compressors which are not full or are not started and have the shortest running time are continuously searched in Q-1 compressors, and the compressor C is used s Is to be loaded on a logicAnd editing the loading until the capacity loading command is executed once by a certain compressor, and stopping the loading if the execution condition of the capacity loading command is not met.
The other is preferentially at the host U k Searching for a compressor C which is not fully loaded or not started and has the shortest running time i If the compressor C i If the capacity loading command execution condition is met once, the compressor C is controlled s Once loaded, if the compressor C i Loaded to full load, then at host U k Continues to search for other compressors that are not fully loaded or not open and have the shortest run time, and follows compressor C i Is loaded by the loading logic of the (a); if host U k All the compressors not fully loaded or not opened are fully loaded, and the host machine U k Searching for the compressor which is not fully loaded or is not started and has the shortest running time among other unlocked compressors, and according to the compressor C i And loading the capacity loading command until the capacity loading command execution condition is no longer met after a certain compressor executes the capacity loading command once, and stopping loading.
S1043, when the capacity load shedding command execution condition is satisfied, controlling Q compressors C by the target control unit 1,2,...,Q The capacity offload command is executed.
In a specific embodiment of step S1043, Q compressors C are controlled by the target control unit 1,2,...,Q Executing a capacity offload command, comprising:
(1) The target control unit is arranged in Q compressors C according to the following priority order 1,2,...,Q Searching for a target compressor, comprising:
at Q compressors C 1,2,...,Q Searching for the compressor C which is already running and has the longest running time v The method comprises the steps of carrying out a first treatment on the surface of the Or alternatively
Preferential to the host U k Searching for the compressor C which is operated and has the longest operation time in other hosts b If the compressor C cannot be found b Then searching the Uk host for the compressor C which is already running and has the longest running time j ；
(2) And controlling the target compressor execution capacity load shedding command obtained by searching, which comprises the following steps:
and each time the capacity load shedding command execution condition is met, controlling the target compressor to execute the capacity load shedding command once.
It can be seen that in this embodiment, the target control unit controls Q compressors C 1,2,...,Q There are two ways to execute the capacity offload command, specifically as follows:
one is in all Q compressors C 1,2,...,Q Searching for the compressor C which is already running and has the longest running time v Compressor C of (2) v Control the compressor C every time the capacity shedding command execution condition is satisfied v Executing a capacity override command when compressor C v After being unloaded to shutdown, continue to search for the other compressor of the Q-1 compressors that has been operated and has the longest operation time, and follow compressor C v And (3) carrying out load shedding until the capacity load shedding command execution condition is no longer met after a certain compressor executes the capacity load shedding command once, and stopping load shedding.
The other is preferentially at the host U k Searching for the compressor C which is operated and has the longest operation time in other hosts b If the compressor C b Is present in accordance with compressor C v Is to compressor C b To unload, if the compressor C b If not, at host U k Searching for a compressor C which is already running and has the longest running time j Control the compressor C every time the capacity shedding command execution condition is satisfied j Once unloaded, if the compressor C j Load shedding to shutdown, then at host U k Continues to search for other compressors that have been operated and have the longest run time, and follows compressor C j Is relieved until the host U k After a certain compressor of the capacity relief command is executed once, the capacity relief command execution condition is no longer satisfied, and the relief is stopped.
In a specific embodiment, the method further comprises:
at the opposite host U k The compressor of some other host is loadedBefore starting the chilled water pump of the host;
at host U k After the compressors of some other host are all turned off, the chilled water pump of that host is turned off at a certain time.
Preferably, the method further comprises:
when Q compressors C of N hosts 1,2,...,Q After all are closed, searching new host U in N hosts L As a new target control unit;
wherein, when U L ≠U k When the host U is started L Is a chilled water pump P of (1) L And at the chilled water pump P L Running the chilled water pump P after the running time reaches a set time threshold k Closing; when U is L ＝U k Holding the chilled water pump P k And opening.
Based on the above disclosure, the present embodiment is achieved by finding the Q compressors among the M compressors that are not locked, and then finding the compressor C with the shortest running time from among the Q compressors k The compressor C k Corresponding host U k As a target control unit and starts the host U k Is a chilled water pump P of (1) k Then obtaining a metering value CT according to the total backwater temperature or the total outlet water temperature of the system, and controlling Q compressors C by the target control unit according to the numerical relation between the metering value CT and the target control value ST and the deviation value DT 1,2,...,Q Loading or unloading is performed. The application realizes the balanced operation among the compressors by acquiring the operation time of the compressors in each host and loading or unloading the compressors in each host according to the operation time of the compressors; in addition, at least one chilled water pump is kept on in the loading or unloading process, so that the formation of dead water in a water supply pipeline can be avoided, and the real-time acquisition of data is realized; in addition, after a new target control unit is determined, the chilled water pump corresponding to the new target control unit is started for a period of time, and then the chilled water pump of the original target control unit is closed, so that balanced operation among the chilled water pumps is realized, and the failure caused by overlong operation time of a certain chilled water pump is avoided, thereby improving the chilled water systemThe service life of the whole device is prolonged.
In a second aspect, the present application provides a computer device, comprising a memory, a processor and a transceiver, which are in communication connection in sequence, wherein the memory is configured to store a computer program, the transceiver is configured to send and receive messages, and the processor is configured to read the computer program and perform a group control method of a chilled water system of a central air conditioner as described in any one of the possible designs of the first aspect.
In a third aspect, the present application provides a computer readable storage medium having instructions stored thereon which, when executed on a computer, perform a group control method of a chilled water system of a central air conditioner as described in any one of the possible designs of the first aspect.
In a fourth aspect, the application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform a group control method of a chilled water system of a central air conditioner as described in any one of the possible designs of the first aspect.
Finally, it should be noted that: the foregoing description is only of the preferred embodiments of the application and is not intended to limit the scope of the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (6)
1. A group control method for a chilled water system of a central air conditioner, comprising:
setting a target control value ST and an allowable deviation value DT of a chilled water system, wherein the chilled water system comprises N hosts and M compressors, and each host is correspondingly provided with a chilled water pump and a plurality of compressors;
from M compressors C 1,2,...,M Find all the Q compressors C that are not locked 1,2,...,Q And from Q compressors C 1,2,...,Q Finding the compressor C with the shortest running time k The compressor C is subjected to k Corresponding host U k As a target control unit, is openedStarting the host U k Is a chilled water pump P of (1) k ；
Acquiring the total backwater temperature or the total outlet water temperature of the chilled water system, and obtaining a metering value CT according to the total backwater temperature or the total outlet water temperature;
controlling Q compressors C by using the target control unit according to the numerical relation between the metering value CT and the target control value ST and the deviation value DT 1,2,...,Q Carrying out load shedding;
controlling Q compressors C by using the target control unit 1,2,...,Q Performing load shedding, comprising: preferential to the host U k Searching for the compressor C which is operated and has the longest operation time in other hosts b If the compressor C cannot be found b Then searching the Uk host for the compressor C which is already running and has the longest running time j The method comprises the steps of carrying out a first treatment on the surface of the Controlling the found compressor to execute a capacity relief command until the compressor is relieved from load to shutdown;
the method further comprises the steps of: at host U k After the compressors of one other host machine are all closed, the chilled water pump of the host machine is closed at a certain time;
the method further comprises the steps of: when Q compressors C of N hosts 1,2,...,Q After all are closed, searching new host U in N hosts L As a new target control unit; wherein, when U L ≠U k When the host U is started L Is a chilled water pump P of (1) L And at the chilled water pump P L Running the chilled water pump P after the running time reaches a set time threshold k Closing; when U is L ＝U k Holding the chilled water pump P k And opening.
2. The group control method of a chilled water system of a central air conditioner according to claim 1, wherein obtaining a total backwater temperature of the chilled water system and obtaining a measured value CT according to the total backwater temperature comprises:
by being arranged on the host U k The return water temperature probe on the main machine U is used for collecting the main machine U k And return water temperature of the host U k Is taken as the backwater temperature ofThe total backwater temperature of the chilled water system is recorded as a first metering value CT 1 。
3. The group control method of a chilled water system of a central air conditioner according to claim 2, wherein obtaining a total outlet water temperature of the chilled water system and obtaining a measured value CT according to the total outlet water temperature comprises:
the water outlet temperature probe arranged on each unit is utilized to respectively collect the water outlet temperature of each unit; wherein,,
when Q compressors C 1,2,...,Q When neither is started, the host U k The sum of the water outlet temperature of (1) and the deviation value DT is used as a second measurement value CT 2 ；
When a plurality of Q compressors are started, calculating to obtain a third measurement value CT according to the water outlet temperature Ti, the total load ratio Ai and/or the flow correction coefficient Bi of each unit corresponding to the started compressors 3 The calculation formula is as follows:
CT 3 ＝Σ(Ai*Ti)；
alternatively, CT 3 ＝Σ(Ai*Bi*Ti)。
4. A group control method of a chilled water system of a central air conditioner according to claim 3, wherein the Q compressors C are controlled by the target control unit according to a numerical relationship between the metering value CT and the target control value ST and the deviation value DT 1,2,...,Q Load shedding is carried out, which comprises the following steps:
setting a numerical relationship between the metering value CT and the target control value ST and the deviation value DT as a capacity load shedding command execution condition;
when the capacity relief command execution condition is satisfied, controlling Q compressors C by the target control unit 1,2,...,Q The capacity offload command is executed.
5. The group control method of a chilled water system of a central air conditioner according to claim 4, wherein,
in the chilled water systemIn the process of refrigerating the system, the execution condition of the capacity load shedding command is CT 1 ＜ST-DT、CT 2 +DT < ST or CT 3 +DT＜ST；
In the heating process of the chilled water system, the capacity load shedding command execution condition is CT 1 ＞ST+DT、CT 2 +DT > ST or CT 3 +DT＞ST。
6. A computer device comprising a memory, a processor and a transceiver in communication with each other in sequence, wherein the memory is adapted to store a computer program, the transceiver is adapted to send and receive messages, and the processor is adapted to read the computer program and to perform a group control method of a chilled water system of a central air conditioner as claimed in any of claims 1-5.
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