CN114151932A - Energy consumption monitoring platform of multi-split system - Google Patents
Energy consumption monitoring platform of multi-split system Download PDFInfo
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- CN114151932A CN114151932A CN202111386174.2A CN202111386174A CN114151932A CN 114151932 A CN114151932 A CN 114151932A CN 202111386174 A CN202111386174 A CN 202111386174A CN 114151932 A CN114151932 A CN 114151932A
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
-
- 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
- F24F11/56—Remote control
- F24F11/58—Remote control using Internet communication
-
- 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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
-
- 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
-
- 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
- F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
- F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
-
- 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
Abstract
The invention discloses an energy consumption monitoring platform of a multi-split system, which comprises: the cloud platform is connected to the communication bus through the gateway equipment; the cloud platform receives the state parameters uploaded by the multi-split system and calculates the frequency conversion efficiency of the compressor frequency converter in each outdoor unit
And the frequency conversion efficiency of the fan frequency converter in each outdoor unit
(ii) a The cloud platform calculates the total output power of the indoor units as the sum of the base plate power of each indoor unit and the fan power of each indoor unit fan; calculating the total output power of the outdoor unit into the power of each outdoor unit substrate, the output power of each compressor frequency converter and
quotient of and output power of each fan frequency converter
The sum of the quotient; and the total energy consumption of the system is calculated in an accumulated mode according to the total output power of the indoor unit and the total output power of the outdoor unit. The invention can quickly and accurately calculate the energy consumption of the multi-split system.
Description
Technical Field
The invention relates to the technical field of multi-online systems, in particular to an energy consumption monitoring platform of a multi-online system.
Background
The application of intelligent control technology and Internet technology in air conditioning systems is based on the capability of monitoring the performance of the air conditioning systems on line and in real time. Through analysis of actual operation performance test data, the defects of the product in the actual operation process are found, main factors causing poor unit performance are found, directions are indicated for optimization design of product structure and optimization design of control strategy, and energy conservation of actual operation of the product is achieved.
The two most important online properties of a product are "online capacity" and "online energy consumption".
The actual operation energy consumption of the multi-split air conditioner system (such as a compressor and a frequency converter thereof, an outdoor fan motor and a frequency converter thereof, and an indoor unit thereof) is large in proportion to the energy consumption of the whole air conditioner, so that the energy consumption monitoring of the multi-split air conditioner system is particularly important.
Currently, the product cost is increased due to the fact that a special electric energy metering module is added for data acquisition, meanwhile, due to the fact that online of a multi-online system is relatively complex, more modeling, calculation and the like are involved in the energy consumption calculation process, relevant algorithms are fused into normal control of the system, chip resources are occupied, the chip is required to have strong calculation capacity, and the product cost is also increased.
Disclosure of Invention
The invention provides an energy consumption monitoring platform of a multi-split system, which is characterized in that the energy consumption of the multi-split system is calculated by acquiring state parameters uploaded by an outdoor unit and an indoor unit on a cloud level, no external acquisition component is required to be additionally arranged, and the product cost is reduced; and the powerful data processing capacity of the cloud platform is utilized, and the computing efficiency is improved.
In order to realize the purpose of the invention, the invention is realized by adopting the following technical scheme:
the application relates to an energy consumption monitoring platform of a multi-split system, which is characterized by comprising:
the multi-split system comprises at least one outdoor unit and at least one indoor unit, wherein the indoor unit is connected with the outdoor unit through a communication bus;
the cloud platform is connected to the communication bus through gateway equipment;
the cloud platform receives the state parameters uploaded by the multi-split system and calculates the frequency conversion efficiency of the compressor frequency converter in each outdoor unit
And the frequency conversion efficiency of the fan frequency converter in each outdoor unit
；
The cloud platform calculates the total output power of the indoor units to be the sum of the base plate power of each indoor unit and the fan power of each indoor unit fan;
calculating the total output power of the outdoor unit into the power of each outdoor unit substrate, the output power of each compressor frequency converter and
quotient, and output power of each fan frequency converter and
the sum of the quotient;
and accumulating and calculating the total energy consumption of the system according to the total output power of the indoor unit and the total output power of the outdoor unit.
In some embodiments of the present application, the conversion efficiency is calculated
The method specifically comprises the following steps:
(1) the frequency converter efficiency at the sample frequency fn is calculated by the following formula
：
(2) method for obtaining frequency conversion efficiency of compressor under full frequency band by interpolation
And T is the torque at frequency f.
In some embodiments of the present application, the output power of the compressor inverter is calculated by the compressor inverter and fed back to the cloud platform through the outdoor unit.
In some embodiments of the present application, the cloud platform corrects the received output power of the compressor inverter.
In some embodiments of the present application, the frequency conversion efficiency
The calculation is made by the following formula:
wherein
Is the frequency of the fan, and is,
is the current of the fan, and the current of the fan,
is a constant;
and the fan frequency and the fan current are uploaded to the cloud platform by the fan frequency converter through the outdoor unit.
In some embodiments of the present application, where heating zones are provided on each compressor, the total energy consumption of the system also includes the energy consumption of each heating zone that is turned on.
In some embodiments of the present application, the fan power of the indoor unit fan is feedback power fed back to the cloud platform; or
And the fan power of the indoor unit fan is corrected power after the feedback power is corrected.
In some embodiments of the present application, the factor for correcting the feedback power is related to a gear of a fan in the indoor unit;
and setting a corresponding correction coefficient according to the gear of the fan.
In some embodiments of the present application, the energy consumption monitoring platform of the multi-split system further includes:
the client is communicated with the cloud platform, a low energy consumption instruction is set and issued to the cloud platform, and the cloud platform receives the low energy consumption instruction and outputs a frequency control instruction;
when one outdoor unit exists, the frequency control command is issued to the outdoor unit and is used for adjusting the frequency of a compressor in the outdoor unit;
when at least two outdoor units exist, the outdoor unit comprises a master outdoor unit and at least one slave outdoor unit, and the frequency control command is sent to the master outdoor unit and used for adjusting the frequency of the compressor in each outdoor unit.
In some embodiments of the present application,
the low energy consumption instruction is an energy consumption instruction or a power instruction set by a user;
when the low energy consumption instruction is the energy consumption instruction, the frequency control instruction adjusts the frequency of the compressor, specifically:
the frequency control instruction controls the frequency of the compressor not to exceed a frequency upper limit value, and the frequency upper limit value corresponds to an energy consumption value represented by the energy consumption instruction;
when the low energy consumption instruction is the power instruction, the frequency control instruction adjusts the frequency of the compressor, specifically:
when the total output power of the system is smaller than a fourth power threshold and larger than a second power threshold, the frequency control instruction prohibits the compressor from increasing the frequency, and when the total output power of the system is larger than or equal to the fourth power threshold, the frequency control instruction forces the compressor to decrease the frequency;
when the total output power of the system is smaller than a third power threshold and larger than a first power threshold, the frequency control instruction prohibits the compressor from increasing the frequency, and when the total output power of the system is larger than or equal to the third power threshold, the frequency control instruction forces the compressor to decrease the frequency;
the first power threshold, the second power threshold, the third power threshold and the fourth power threshold are preset according to the power represented by the power command, and the total system output power is the sum of the total indoor unit output power and the total outdoor unit output power.
The energy consumption monitoring platform of the multi-split system provided by the invention has the following advantages and beneficial effects:
(1) the total output power of the outdoor unit, the total output power of the indoor unit and the total energy consumption of the system are obtained through calculation on the cloud platform according to the state parameters uploaded by the multi-split system, real-time monitoring of the energy consumption of the multi-split system is achieved, external hardware detection equipment is avoided being added, and product cost is reduced;
(2) the system total energy consumption is calculated by utilizing the strong computing capacity of the cloud platform, so that the occupation of chip resources of a multi-split system is avoided, and the computing efficiency is improved;
(3) the calculation of the total energy consumption of the system relates to various parameters of the outdoor unit and the indoor unit, and the energy consumption calculation accuracy is improved.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic block diagram of an embodiment of an energy consumption monitoring platform of a multi-split system according to the present invention;
fig. 2 is a flow chart of calculating the frequency conversion efficiency of a compressor frequency converter in an embodiment of an energy consumption monitoring platform of a multi-split system provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
Basic operation principle of air conditioner
The air conditioner performs a cooling and heating cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The cooling and heating cycle includes a series of processes involving compression, condensation, expansion, and evaporation to cool or heat an indoor space.
The low-temperature and low-pressure refrigerant enters the compressor, the compressor compresses the refrigerant gas in a high-temperature and high-pressure state, and the compressed refrigerant gas is discharged. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigerating effect by heat exchange with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor, an outdoor heat exchanger, and an outdoor fan, the indoor unit of the air conditioner includes a portion of an indoor heat exchanger and an indoor fan, and a throttling device (e.g., a capillary tube or an electronic expansion valve) may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. The air conditioner performs a heating mode when the indoor heat exchanger serves as a condenser, and performs a cooling mode when the indoor heat exchanger serves as an evaporator.
The indoor heat exchanger and the outdoor heat exchanger are switched to be used as a condenser or an evaporator, a four-way valve is generally adopted, and specific reference is made to the arrangement of a conventional air conditioner, which is not described herein again.
The refrigeration working principle of the air conditioner is as follows: the compressor works to enable the interior of the indoor heat exchanger (in the indoor unit, the evaporator at the moment) to be in an ultralow pressure state, liquid refrigerant in the indoor heat exchanger is rapidly evaporated to absorb heat, air blown out by the indoor fan is cooled by the coil pipe of the indoor heat exchanger to become cold air which is blown into a room, the evaporated and vaporized refrigerant is compressed by the compressor, is condensed into liquid in a high-pressure environment in the outdoor heat exchanger (in the outdoor unit, the condenser at the moment) to release heat, and the heat is dissipated into the atmosphere through the outdoor fan, so that the refrigeration effect is achieved by circulation.
The heating working principle of the air conditioner is as follows: the gaseous refrigerant is pressurized by the compressor to become high-temperature and high-pressure gas, and the high-temperature and high-pressure gas enters the indoor heat exchanger (the condenser at the moment), is condensed, liquefied and released heat to become liquid, and simultaneously heats indoor air, so that the aim of increasing the indoor temperature is fulfilled. The liquid refrigerant is decompressed by the throttling device, enters the outdoor heat exchanger (an evaporator at the moment), is evaporated, gasified and absorbs heat to form gas, absorbs the heat of outdoor air (the outdoor air becomes cooler) to form gaseous refrigerant, and enters the compressor again to start the next cycle.
Multi-split system
The energy consumption monitoring platform of the multi-online system is used for calculating and monitoring the energy consumption of the multi-online system.
The multiple on-line system refers to a multiple on-line air conditioner, which includes at least one outdoor unit (hereinafter, referred to as an outdoor unit) and at least one indoor unit (hereinafter, referred to as an indoor unit) connected to each other through a connection pipe.
Each outdoor unit and each indoor unit are connected to a communication bus.
When one outdoor unit exists, the state parameters of each indoor unit are transmitted to the outdoor unit through the communication bus.
When at least two outdoor units exist, the outdoor units are divided into a master outdoor unit and at least one slave outdoor unit, and the state parameters of each indoor unit are transmitted to the master outdoor unit through a communication bus.
Energy consumption monitoring platform of multi-split system
Referring to fig. 1, a schematic block diagram of an energy consumption monitoring platform of a multi-split system is shown.
The energy consumption monitoring platform of the multi-split system comprises the multi-split system, a gateway device (not shown in fig. 1) and a cloud platform.
The multi-split air conditioning system refers to the content described above, that is, the indoor unit and the outdoor unit shown in fig. 1.
< gateway apparatus >
The gateway equipment is connected to the communication bus and is in communication connection with each indoor unit, each outdoor unit and the cloud platform respectively.
The gateway device is provided with a communication module, is not limited to communication in WiFi/NB-IOT modes and the like, and is used for reporting the state of the multi-online system (such as an indoor unit and an outdoor unit) to the cloud platform.
The gateway device may be an NB-IOT adapter configured on the outdoor unit, and the NB-IOT adapter includes a main control chip and a communication chip connected to the main control chip.
The main control chip is used for acquiring the state parameters of the internal and external units in the multi-split system and transmitting the state parameters to the communication chip.
The communication chip is used for receiving the state parameters and feeding back the states of the internal and external units in the current air conditioning system to the cloud platform.
The gateway device may also be a WiFi gateway, which may be connected to the communication bus independently of the multi-split system, and may report the information related to the multi-split system to the cloud platform.
The status parameters include the status parameters of the outdoor unit and the status parameters of the indoor unit forwarded by the outdoor unit.
The state parameters of the outdoor unit at least comprise suction temperature Ts, suction pressure Ps, exhaust temperature, exhaust pressure, speed of the compressor, running frequency of the compressor, output power fed back by a frequency converter of the compressor, running fan frequency of a fan of the outdoor unit, fan current, fan power fed back by the frequency converter of the fan and the like.
The state parameters of the indoor unit at least comprise the gear of the indoor unit fan, the fan power of the indoor unit fan and the like.
< cloud platform >
The cloud platform is interacted with the outdoor unit and the indoor unit through the gateway device, and the cloud platform processes service data related to functions between the client and the cloud platform.
The client may refer to a terminal device operated by a user, such as an APP side and a WEB side.
The APP side can be a mobile phone, a tablet or a computer provided with an APP for controlling the multi-online equipment, and the APP side interacts with the cloud platform.
The WEB end may be a management platform for opening a WEB port.
The drive-by-wire can be a networking drive-by-wire, i.e., the drive-by-wire is a drive-by-wire with a communication module (e.g., a WIFI communication module).
And each wire controller is correspondingly in communication connection with the indoor unit and is used for controlling the work of the indoor unit.
In the application, a user can send a user instruction to the cloud platform through the APP side, the WEB side and the line controller.
In the present application, referring to the signal flow direction shown by the solid arrow in fig. 1, the state parameters as described above are received on the cloud platform, and the total system energy consumption is calculated according to the state parameters as described above, and then the calculated total system energy consumption may be uploaded to the client (APP side/WEB side) for display, or forwarded to the line controller side through the outdoor unit and the indoor unit for display.
The total energy consumption of the system mainly comprises the total energy consumption of the indoor unit and the total energy consumption of the outdoor unit.
The specific cloud platform can calculate the total energy consumption of the system as follows.
Total output power of indoor unit
And the cloud platform calculates the total output power of the indoor unit according to the state parameters uploaded by the indoor unit.
The state parameters related to the indoor unit comprise gear positions of the indoor unit fan, fan power of the indoor unit fan and the like, and the state parameters can be forwarded to the cloud platform through the outdoor unit.
The total output power of the indoor units comprises the sum of the power of each indoor unit substrate and the power of each indoor unit fan.
The fan power of the indoor unit fan can be the fan power uploaded by the indoor unit
And i is the serial number of the indoor unit.
Through test and test, the fan power uploaded by the indoor unit is found
The difference is relative to the actual power and the gear of the fan of the indoor unit.
Therefore, the fan power needs to be corrected by the correction factor
And correcting to obtain the corrected fan power.
The correction coefficient is related to the gear of the fan, and the corresponding correction coefficient is set for the fan power fed back by each indoor unit according to the gear of the corresponding fan
。
Thus, the corrected fan power may be
*
。
The indoor unit substrate power of each indoor unit may include component power on the substrate, indicator light power, etc., which may be a known value.
The indoor unit substrate power may be forwarded to the cloud platform via the outdoor unit.
For multiple indoor units, the power of indoor unit substrate
The sum of the indoor unit base plate powers of a plurality of indoor units is shown.
Therefore, the total output power of the indoor unit
Can be calculated by the following formula (1) or formula (2):
calculating the period and the total output power of the indoor unit according to the energy consumption
And the total energy consumption of the indoor unit can be obtained.
Total output power of outdoor unit
The total output power of the outdoor unit mainly includes the power of the outdoor unit substrate, the quotient of the output power of each compressor inverter and the frequency conversion efficiency of the compressor inverter, and the quotient of the output power of the fan inverter and the frequency conversion efficiency of the fan inverter in each outdoor unit.
And the cloud platform calculates the total output power of the outdoor unit according to the state parameters uploaded by the outdoor unit.
The state parameters related to the outdoor unit comprise a suction temperature Ts on a suction side of the compressor, a suction pressure Ps, a discharge temperature on a discharge side, a discharge pressure, a rotating speed of the compressor, an operating frequency of the compressor, output power fed back by a frequency converter of the compressor, a fan frequency for operating a fan of the outdoor unit, fan current, fan power fed back by the frequency converter of the fan and the like.
< outdoor Unit substrate Power >
The outdoor unit substrate power of each outdoor unit may include on-substrate device power, indicator lamp power, etc., which may be a known value.
The outdoor unit substrate power may be uploaded to the cloud platform.
For multiple outdoor units, outdoor unit substrate power
The sum of outdoor unit base plate powers of a plurality of outdoor units is shown.
< output of compressor inverter >
The frequency conversion efficiency of the compressor frequency converter is calculated by establishing a frequency-sample frequency-torque model
。
Referring to FIG. 2, calculating the frequency conversion efficiency of a compressor inverter is illustrated
Is described.
Firstly, a certain amount of sample frequency (namely, fixed selected frequency) is selected, and through a complete machine experiment, a model of efficiency-sample frequency-torque is obtained, namely:
where Ri is a constant and Ri < 1.
In formula (3), fn (n =1,2, 3.) is the sample frequencyRate, Tn (n =1,2, 3.) is the torque at the current frequency (which in this case shall be the sample frequency fn),
is the conversion efficiency at the sample frequency fn.
Secondly, since the selected frequency is the sample frequency, the frequency conversion efficiency at the sample frequency fn can be obtained
Obtaining the frequency conversion efficiency of the compressor frequency converter under the full frequency band by fitting
。
In the present application, the frequency conversion efficiency is determined according to the sample frequency fn
Obtained by interpolation
。
That is to say that the first and second electrodes,
（4）
wherein f1 and f2 are both sample frequencies, T1 is the torque at sample frequency f1, T2 is the torque at sample frequency f2,
for the conversion efficiency at the sample frequency f1 (and torque T1),
the frequency conversion efficiency at sample frequency f2 (and torque T2) is given as f is any frequency, and T is the torque at any frequency f.
Thus, the frequency conversion efficiency of the compressor frequency converter under the full frequency band can be obtained through the formula (4)
。
In the above calculation, the torque T at the frequency f is required.
As follows, how to obtain the torque will be described in detail.
Referring to fig. 2 again, the outdoor unit uploads the state parameters to the cloud platform; the cloud platform calculates torque T under the frequency f; according to the frequency conversion efficiency at the selected sample frequency fn
(ii) a Is obtained to
。
And calculating the inlet enthalpy Hin of the compressor according to the suction temperature Ts and the suction pressure Ps on the suction side of the compressor.
Calculating the suction state density of the compressor by using the following formula (5) according to the suction temperature Ts and the suction pressure Ps on the suction side of the compressor
。
Wherein the content of the first and second substances,
to calculate the constant coefficient, the following selection can be made:
，
，
，
，
。
and calculating the outlet enthalpy value Hout of the compressor according to the exhaust temperature and the exhaust pressure of the exhaust side of the compressor.
As described above, the compressor inlet enthalpy Hin, the compressor outlet enthalpy Hout, and the suction state density at the acquired frequency
And the rotation speed of the compressor, the torque T can be obtained.
The output power of the compressor frequency converter is calculated by the frequency converter in the compressor, and the calculated output power is fed back to the outdoor unit and then uploaded to the cloud platform by the outdoor unit.
For a compressor, the output power of the compressor frequency converter in the application can be the uploaded output power
。
However, in practice, the output power uploaded by the frequency converter at different frequency intervals
There is an error from the actual output power.
Thus, the uploaded output power is received at the cloud platform pair for the purpose of accurate computation of the output power
And (6) carrying out correction.
The correction is performed using the following equation (6).
Wherein the content of the first and second substances,
the correction coefficients in different frequency intervals are constants for experimental debugging.
The corrected output power of the frequency converter may thus be
。
In this way, for the plurality of compressors in the outdoor unit, the output power P1 of the inverter can be calculated by the following formula (7) or formula (8):
wherein i represents the number of compressors of the outdoor unit.
< heating Belt Power of heating Belt >
Sometimes, a heating belt is arranged in the compressor, an oil pool in the compressor is generally preheated through the heating belt before the compressor is started, and the compressor is started after the control condition is met, so that the compressor is prevented from being out of work when being started.
Therefore, if the heating zones are provided in the respective compressors, the total output power of the outdoor unit needs to be added to the heating zone power of the heating zones
。
In this way, the heating zone power P2 of the heating zones for the plurality of compressors in the outdoor unit can be calculated by the following equation (9):
wherein i represents the number of compressors in the outdoor unit.
< output Power of Fan frequency converter >
The fan frequency Ffan and the fan current Ifan of the running fan and the fan power fed back by the fan frequency converter in the outdoor unit
Uploading the equal parameters to a cloud platform, and calculating the frequency conversion efficiency of the fan by the cloud platform
。
In practical test, because the frequency converter has the problem of frequency conversion efficiency, the fan power is measured by the fan frequency Ffan and the fan current Ifan
And performing power correction.
The frequency conversion efficiency is calculated by the following formula (10)
：
Wherein the content of the first and second substances,
to calculate the constant, its value is related to the fan type.
The formula is obtained by fitting data between actual test power and fan power test fed back by a fan frequency converter in a laboratory at different rotating speeds.
This makes it possible to obtain the corrected fan power P3.
Wherein j is the number of fans in the outdoor unit.
Thus, the power of the outdoor unit is obtained
=
+P1+P2+P3。
When a plurality of outdoor units exist, the total output power P = of the outdoor units
Wherein i represents the number of outdoor units.
And obtaining the total energy consumption of the outdoor unit according to the energy consumption calculation period and the total output power P of the outdoor unit.
Total energy consumption of system
On the cloud platform side, the cloud platform utilizes formula (12) to accumulate the total energy consumption of the computing system
：
Wherein i represents the number of the outdoor units, DT is the energy consumption calculation period of the cloud platform, and can be set as DT =10s,
is the energy consumption calculated at the last time,
and
the units of (A) are kW.h.
The method has the advantages that the strong computing capability of the cloud platform is utilized, the energy consumption of the multi-online system can be calculated, the parameters of the multi-online system participate, the accuracy of calculation is ensured, the calculation is completely realized on the cloud platform, no hardware equipment is additionally arranged, and the product cost is reduced.
And the cloud platform has strong computing capability, can quickly realize energy consumption calculation of the multi-split system, and has good user experience.
The cloud platform can calculate the total accumulated system energy consumption every 10s, and can set the total accumulated system energy consumption to be reported to the client every 1h, for example, App side display, and simultaneously, the total accumulated system energy consumption can be sent to the indoor unit through the outdoor unit and then transferred to the line controller by the indoor unit to synchronously display the electric quantity.
As described above, referring to fig. 1, it is possible to provide a client operated by a user, such as an App side, a WEB side.
Referring to the signal flow direction shown by the dotted arrow in fig. 1, a user can set a low energy consumption instruction at a client and issue the low energy consumption instruction to the cloud platform to perform energy consumption control.
Or, referring to the signal flow direction shown by the dashed-dotted line arrow in fig. 1, the user can also set a low power consumption instruction through the online controller side, send the low power consumption instruction to the indoor unit, forward the low power consumption instruction to the outdoor unit by the indoor unit, and forward the low power consumption instruction to the cloud platform by the outdoor unit to perform power consumption control. And the cloud platform receives the low-energy-consumption instruction and outputs a frequency control instruction.
When one outdoor unit exists in the multi-split system, the frequency control command is issued to the outdoor unit and used for controlling and adjusting the frequency of a compressor in the outdoor unit so as to adjust the energy consumption of the multi-split system.
When at least two outdoor units exist in the multi-split system, one outdoor unit is set as a master outdoor unit, and the other outdoor units are slave outdoor units.
At the moment, the frequency control command is issued to the master outdoor unit, the master outdoor unit monitors the running states of all the outdoor units in real time according to the unit running parameters of the master outdoor unit and the uploaded unit running parameters of the slave outdoor units, comprehensively evaluates the running conditions of all the outdoor units, redistributes the compressor frequency of each outdoor unit, and controls and adjusts the frequency of each compressor.
The low power consumption command can be set by a user and can be a power consumption command or a power command, wherein the power consumption command can represent a power consumption value W and the power command can represent a power P'.
Thus, the user may select one of the power consumption command and the power command to adjust the frequency.
The specific processes of the two instructions are described in detail below.
(1) When the low power consumption instruction is a power consumption instruction
The frequency control instruction controls and adjusts the frequency of the compressor not to exceed the upper limit value of the frequency, so that the frequency of the compressor is simply adjusted, and low-energy-consumption operation of the multi-split system is realized.
The upper limit value of the frequency corresponds to an energy consumption value W represented by the energy consumption instruction, and the unit of the upper limit value of the frequency is kW.h.
It should be noted that, the correspondence between the frequency upper limit value and the energy consumption command is preset, and when the energy consumption command is selected, the corresponding frequency upper limit value is selected correspondingly.
(2) When the low power consumption command is a power command
The power command characterizes power P'.
According to the power P ', the user may also set a first power threshold P1', a second power threshold P2', a third power threshold P3' and a fourth power threshold P4 '.
The first power threshold P1', the second power threshold P2', the third power threshold P3 'and the fourth power threshold P4' may be set as follows:
a first power threshold P1'= P' — Δ P1, a third power threshold P3'= P' +Δp1, a second power threshold P2'= P' - Δ P2, a fourth power threshold P4'= P' +Δp 2.
Where Δ P1 and Δ P2 may also be user defined.
The total output power of the system is compared with a first power threshold P1', a second power threshold P2', a third power threshold P3 'and a fourth power threshold P4', and the frequency of the compressor is adjusted according to the comparison result, so that the autonomous energy consumption control of a user is realized.
Wherein the total output power P of the systemGeneral assemblyTotal output power of indoor unit
And the sum of the total output power P of the outdoor unit.
At PGeneral assembly< P2', the frequency control command performs normal control, e.g., the current frequency control may be maintained.
P is less than or equal to P2General assemblyAt P4 ≦, the frequency control command disables the compressor from upshifting, e.g., to maintain the current operating frequency or to decrease the frequency (e.g., down-convert at 0.5 Hz/s).
At PGeneral assembly(> P4'), the frequency control commands force the compressor to ramp down, for example at 1 Hz/s.
In this case, the cloud platform periodically accumulates the calculated total output power P of the systemGeneral assemblyIs increasing.
At PGeneral assembly< P1', the frequency control command performs normal control, e.g., the current frequency control may be maintained.
P is less than or equal to P1General assemblyAt P3 ≦, the frequency control command disables the compressor from upshifting, e.g., to maintain the current operating frequency or to decrease the frequency (e.g., down-convert at 0.5 Hz/s).
At PGeneral assembly(> P3'), the frequency control commands force the compressor to ramp down, for example at 1 Hz/s.
In this case, the cloud platform periodically accumulates the calculated total output power P of the systemGeneral assemblyIs decreasing.
According to the low energy consumption command set by the user, a frequency control command for controlling the frequency of the compressor can be formed, and the use flexibility of the user is ensured.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. The utility model provides a multi-online system energy consumption monitoring platform which characterized in that includes:
the multi-split system comprises at least one outdoor unit and at least one indoor unit, wherein the indoor unit is connected with the outdoor unit through a communication bus;
the cloud platform is connected to the communication bus through gateway equipment;
the cloud platform receives the state parameters uploaded by the multi-split system and calculates the frequency conversion efficiency of the compressor frequency converter in each outdoor unit
And the frequency conversion efficiency of the fan frequency converter in each outdoor unit
；
The cloud platform calculates the total output power of the indoor units to be the sum of the base plate power of each indoor unit and the fan power of each indoor unit fan;
calculating the total output power of the outdoor unit into the power of each outdoor unit substrate, the output power of each compressor frequency converter and
quotient, and output power of each fan frequency converter and
the sum of the quotient;
and accumulating and calculating the total energy consumption of the system according to the total output power of the indoor unit and the total output power of the outdoor unit.
2. The multi-online system energy consumption monitoring platform as claimed in claim 1, wherein the frequency conversion efficiency is calculated
Tool for measuringThe body is as follows:
(1) the frequency converter efficiency at the sample frequency fn is calculated by the following formula
：
(2) method for obtaining frequency conversion efficiency of compressor under full frequency band by interpolation
And T is the torque at frequency f.
3. The multi-online system energy consumption monitoring platform as claimed in claim 1, wherein the output power of the compressor inverter is calculated by the compressor inverter and fed back to the cloud platform through the outdoor unit.
4. The multi-online system energy consumption monitoring platform as recited in claim 3,
and the cloud platform corrects the received output power of the compressor frequency converter.
5. The multi-online system energy consumption monitoring platform as claimed in claim 1, wherein the frequency conversion efficiency
The calculation is made by the following formula:
wherein
Is the frequency of the fan, and is,
is the current of the fan, and the current of the fan,
is a constant;
and the fan frequency and the fan current are uploaded to the cloud platform by the fan frequency converter through the outdoor unit.
6. The multi-online system energy consumption monitoring platform as recited in claim 1,
when each compressor is provided with a heating belt, the total energy consumption of the system also comprises the energy consumption of each heating belt which is started.
7. The multi-online system energy consumption monitoring platform as claimed in claim 1, wherein the fan power of the indoor unit fan is feedback power fed back to the cloud platform; or
And the fan power of the indoor unit fan is corrected power after the feedback power is corrected.
8. The multi-online system energy consumption monitoring platform as claimed in claim 7, wherein a coefficient for correcting the feedback power is related to a gear of a fan in the indoor unit;
and setting a corresponding correction coefficient according to the gear of the fan.
9. The multi-split system energy consumption monitoring platform as claimed in claim 1, further comprising:
the client is communicated with the cloud platform, a low energy consumption instruction is set and issued to the cloud platform, and the cloud platform receives the energy consumption instruction and outputs a frequency control instruction;
when one outdoor unit exists, the frequency control command is issued to the outdoor unit and is used for adjusting the frequency of a compressor in the outdoor unit;
when at least two outdoor units exist, the at least two outdoor units comprise a master outdoor unit and at least one slave outdoor unit, and the frequency control command is sent to the master outdoor unit and used for adjusting the frequency of the compressor in each outdoor unit.
10. The multi-online system energy consumption monitoring platform as recited in claim 9,
the low energy consumption instruction is an energy consumption instruction or a power instruction set by a user;
when the low energy consumption instruction is the energy consumption instruction, the frequency control instruction adjusts the frequency of the compressor, specifically:
the frequency control instruction controls the frequency of the compressor not to exceed a frequency upper limit value, and the frequency upper limit value corresponds to an energy consumption value represented by the energy consumption instruction;
when the low energy consumption instruction is the power instruction, the frequency control instruction adjusts the frequency of the compressor, specifically:
when the total output power of the system is smaller than a fourth power threshold and larger than a second power threshold, the frequency control instruction prohibits the compressor from increasing the frequency, and when the total output power of the system is larger than or equal to the fourth power threshold, the frequency control instruction forces the compressor to decrease the frequency;
when the total output power of the system is smaller than a third power threshold and larger than a first power threshold, the frequency control instruction prohibits the compressor from increasing the frequency, and when the total output power of the system is larger than or equal to the third power threshold, the frequency control instruction forces the compressor to decrease the frequency;
the first power threshold, the second power threshold, the third power threshold and the fourth power threshold are preset according to the power represented by the power command, and the total system output power is the sum of the total indoor unit output power and the total outdoor unit output power.
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