CN113959069B - Air conditioning system - Google Patents
Air conditioning system Download PDFInfo
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- CN113959069B CN113959069B CN202111222578.8A CN202111222578A CN113959069B CN 113959069 B CN113959069 B CN 113959069B CN 202111222578 A CN202111222578 A CN 202111222578A CN 113959069 B CN113959069 B CN 113959069B
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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
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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
- F24F11/56—Remote control
- F24F11/58—Remote control using Internet communication
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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
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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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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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Human Computer Interaction (AREA)
- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioning system, comprising: a plurality of outdoor units in which a refrigerant circuit portion capable of operating a refrigeration cycle is provided, the refrigerant circuit having a compressor disposed therein; the air conditioning system further includes: the cloud control platform is configured to receive the working parameters and/or the running states of the plurality of outdoor units, generate or call at least one compressor protection condition according to the received working parameters and/or running states, judge whether the protection condition of the corresponding compressor is met, and generate and output a protection instruction to control the operation of the compressor when the protection condition is met. According to the invention, the compressor frequency protection calculation is completely performed at one end of the cloud control platform, namely, the cloud calculation is introduced, the data processing capability of the cloud calculation is fully exerted, each outdoor unit is kept very stable, and the operation of a main machine is not only stable, so that the service life of the whole unit is prolonged to a certain extent.
Description
Technical Field
The invention belongs to the technical field of air conditioning equipment, and particularly relates to an air conditioning system.
Background
Along with the increasing demand of air conditioning unit intellectualization, for realizing remote intelligent real-time control, traditional air conditioning unit adds communication equipment such as intelligent gateway. The intelligent gateway is in communication connection with the relay device based on communication protocols of 2G, 3G, 4G, wiFi and the like, and is further accessed to the cloud platform to acquire remote services. At present, a mobile terminal or a computer user interface connected to the same network is mostly adopted for an air conditioning unit controlled based on a cloud platform to input control instructions, and the cloud platform is used as a platform for instruction forwarding or storing accumulated running time, operation schedule and the like. In principle, the communication control mode is to migrate the traditional parameters controlled by the remote controller or the line controller to the cloud, the final control effect is not obviously changed, the control function which can be used by the user is not increased, and the computing capability of the cloud platform is not fully utilized.
Particularly, for a multi-split air conditioner provided with a plurality of outdoor units, a plurality of compressors are arranged therein. In the existing communication control mode, a cloud platform is often used as monitoring equipment, and a monitoring interface is provided to monitor the capacity, the running state, noise and the like of each air conditioner outdoor unit. However, for the multi-split air conditioning system provided with a plurality of compressors, an abnormal situation which may occur during the whole operation is more complicated. In the case of the compressor itself, abnormal phenomena such as abnormal suction and discharge pressure, abnormal motor temperature, phase loss of a power supply, unbalanced voltage among phases, etc. may occur. In the prior art, when these abnormal phenomena are faced, the control chip in each outdoor unit is usually adopted to perform local protection, or the air conditioner outdoor unit serving as a host is set to operate in a communication control mode to be controlled by a control target with highest priority, so that the stability of the whole unit is poor.
The above information disclosed in this background section is only for enhancement of understanding of the background section of the application and therefore it may not form the prior art that is already known to those of ordinary skill in the art.
Disclosure of Invention
The invention aims at solving the problem that in the prior art, when a multi-split air conditioner compressor is abnormal, a control chip in each outdoor unit is usually adopted for local protection, or a control target with the highest priority is set for controlling the operation of an air conditioner outdoor unit serving as a host in a communication control mode, so that the stability of an integral unit is poor.
In order to achieve the aim of the invention, the invention is realized by adopting the following technical scheme:
an air conditioning system, comprising: a plurality of outdoor units in which a refrigerant circuit portion capable of operating a refrigeration cycle is provided, the refrigerant circuit having a compressor disposed therein; the air conditioning system further includes: the cloud control platform is configured to receive the working parameters and/or the running states of the plurality of outdoor units, generate or call at least one compressor protection condition according to the received working parameters and/or running states, judge whether the protection condition of the corresponding compressor is met, and generate and output a protection instruction to control the operation of the compressor when the protection condition is met.
Compared with the prior art, the invention has the advantages and positive effects that:
according to the invention, the compressor frequency protection calculation is completely performed at one end of the cloud control platform, namely, the cloud calculation is introduced, the data processing capability of the cloud calculation is fully exerted, each outdoor unit is kept very stable, and the operation of a main machine is not only stable, so that the service life of the whole unit is prolonged to a certain extent.
Other features and advantages of the present invention will become apparent upon review of the detailed description of the invention in conjunction with the drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a system architecture diagram of an embodiment of an air conditioning system provided by the present invention;
fig. 2 is a schematic diagram of data transmission when an NB-IoT wireless communication module is employed;
FIG. 3 is a schematic diagram of performing a return difference control based on an upper pressure ratio limit protection condition;
FIG. 4 is a schematic diagram of performing a return difference control based on a pressure ratio lower limit protection condition;
FIG. 5 is a schematic diagram of performing a return difference control based on a compressor discharge pressure maximum protection condition;
fig. 6 is a schematic diagram of performing return difference control based on a secondary current upper limit protection condition.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and examples.
It should be noted that, in the description of the present invention, terms such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Aiming at the problem that in the prior art, when the compressor of the multi-split air conditioner is abnormal, a control chip in each outdoor unit is usually adopted to run a local protection program, or the air conditioner outdoor unit serving as a host is set to run stably in a communication control mode to control a control target with the highest priority, the stability of the whole unit is poor, and the air conditioning system is designed and provided.
First, an architecture of an air conditioning system is described, and as shown in fig. 1, the air conditioning system according to the present embodiment includes four outdoor units. The four outdoor units can be configured to work in a group mode, for example, the outdoor unit A and the outdoor unit B form a group, and indoor units corresponding to the outdoor units are arranged in a matching way, and the indoor units comprise indoor units 1 to 6; similarly, the outdoor units C and D are a group, and the indoor units corresponding thereto are provided in a mating manner, including the indoor units 7 to 12. A refrigerant circuit portion in which a refrigeration cycle can be operated is provided in the outdoor unit. Specifically, the refrigerant loop is provided with a compressor, an outdoor heat exchanger, an expansion valve, a four-way reversing valve, an indoor heat exchanger and other main components, and the outdoor unit is connected with the indoor unit corresponding to the outdoor unit through a connecting pipeline to form a vapor compression refrigeration cycle; the compressor, the outdoor heat exchanger, the expansion valve and the four-way reversing valve are arranged in the outdoor unit, and the indoor heat exchanger is arranged in the indoor unit. The four outdoor units can be provided with one compressor or a plurality of compressors, alternating current is supplied to the compressors through the frequency conversion device, and when the output frequency of the frequency conversion device changes, the rotating speed of the compressors changes, so that different air conditioning capacities are realized. In the present embodiment, it is preferable to configure two compressors, the compressor A1 corresponding to the outdoor unit a and the outdoor unit B operated in groups, and the compressor A2 corresponding to the outdoor unit C and the outdoor unit D operated in groups. Each indoor unit may employ an independent air supply structure, such as a wall-mounted indoor unit, a floor-mounted indoor unit, a ducted indoor unit, or an indoor unit embedded in a ceiling, or the like. Each indoor unit is correspondingly provided with a wire controller, and the wire controller is provided with an operation interface for a user to input a set temperature and an operation mode and a display interface for displaying the real-time temperature or the operation state of the air-conditioning room. Preferably, an outdoor heat exchanger is disposed in each of the outdoor units, and the refrigerant in the outdoor heat exchanger may exchange heat with an external medium, which may be water or air. In the present embodiment, the number of the outdoor units is not limited, and two or more outdoor units may be provided. The number of the electronic expansion valves and the four-way valves can be designed according to the functional requirement of the air conditioning system, which is not the protection focus of the invention and is not repeated here.
The outdoor unit is provided with an outdoor unit main board, and the outdoor unit main board is preferably provided with an internal controller, and the internal controller is configured to drive the frequency conversion device to work, receive and process sampling signals of various sensors and realize necessary communication functions. The number of internal controllers is preferably the same as the number of outdoor units or, in an alternative, the same as the number of compressors. The internal controller is preferably implemented by a single processing chip. Unlike the prior art, in this embodiment, a cloud control platform is also provided in the air conditioning system. The cloud control platform is in communication connection with the internal controller. The cloud control platform is configured to receive the working parameters and/or the running states of the plurality of outdoor units, generate or call at least one compressor protection condition according to the received working parameters and/or running states, judge whether the protection condition of the corresponding compressor is met, and generate and output a protection instruction to the internal controller to control the running of the compressor through the frequency conversion device when the protection condition is met.
In this embodiment, the outdoor unit main board is preferably provided with a remote communication module. Alternatively, the telecommunications module may communicate with the cloud control platform based on a conventional 4G network or 5G network. In a preferred form, the telecommunications module is an NB-IoT wireless telecommunications module (shown as 13-1, 13-2, 13-3 and 13-4 in FIG. 1). The outdoor unit with the NB-IoT wireless communication module is connected to the NB-IoT network and communicates with the cloud control platform via the NB-IoT platform. As shown in fig. 2, an alternative data stream includes: after the outdoor unit is powered on, the data is reported through the NB-IoT wireless communication module, where the data includes the operating parameters and/or the operating state of the outdoor unit, and the details of the operating parameters and/or the operating state will be described in detail below. The base station eNB in the NB-IoT network uploads the data to the operator core network and by the operator core network to the NB-IoT platform. And after the NB-IoT platform discovers new data, pushing the new data to the cloud control platform. The cloud control platform updates the database and communicates with the NB-IoT immediately after discovering that any of the outdoor units has new data. The NB-IoT platform initiates a new thread to issue cloud control platform priority instructions (similarly, a new thread may also be initiated to issue a wire controller priority instruction) for transmission to the base station via the operator core network. The base station begins addressing the outdoor unit and receiving a response output by the outdoor unit, further uploading the received response to the operator core network, and uploading to the cloud control platform via the NB-IoT platform. In this way, the cloud control platform may communicate with all of the outdoor units accessing the NB-IoT platform and may output the generated instructions to the corresponding outdoor units. The cloud control platform can also be provided with a man-machine interaction interface or is further in communication connection with other mobile terminals. The NB-IoT platform may be an existing service provider provided NB-IoT platform including a traffic gateway and CMP location interface, and is not limited herein to the service provider of the NB-IoT platform.
In order to meet the comfort requirement, the air conditioning system achieves the purpose of rapid refrigeration or rapid heating by adjusting the operation frequency of the compressor at the beginning of operation, and meanwhile, in order to ensure the stability of the compressor, the compressor frequency protection calculation is necessary. Specifically, after all compressors of the air conditioning system reach a set operation frequency, for example, 31Hz, or a high-efficiency mode is set and started through a man-machine interaction interface or a mobile terminal, the cloud control platform executes compressor frequency protection calculation at intervals and issues a protection instruction. The interval duration may be adjustable, for example, 1s.
The details of the compressor frequency protection calculation are presented below. First, to prevent excessive bearing load caused by abrasion of the compressors, the motor windings Wen Duguo liter, the cloud control platform is configured to generate one compressor protection condition, i.e., an upper pressure ratio limit protection condition, for each compressor according to the received operation states of the plurality of outdoor units. Specifically: the cloud control platform receives the suction pressure and the discharge pressure of the compressor in a set period according to a set frequency, and calculates the pressure ratio; wherein the suction pressure and the discharge pressure are detected by a sensor provided in the outdoor unit, the setting period and the setting frequency may be set according to the data processing capability of the internal controller and the sensor, which is not further defined herein. The cloud control platform determines and monitors the pressure ratio maximum ε max . Further, a pressure ratio upper limit protection condition is generated according to the operation state of the outdoor unit, whether the corresponding pressure ratio upper limit protection condition is met or not is judged, and a protection instruction is output to keep the current operation state of the compressor when the pressure ratio upper limit protection condition is met, the frequency of the compressor is forbidden to rise, or the frequency of the compressor is controlled to fall. In calculating the pressure ratio, the exhaust pressure and the intake pressure may be appropriately corrected, for example
Wherein P is d For exhaust pressure, P s For suction pressure, a and b are constants, for exampleIf a is set to 0.10 and b is set to 0.06.
In the broadest sense, when the pressure ratio is at a maximum ε max And the normal operation of the compressor can be satisfied when the temperature is less than or equal to 10. However, for an air conditioning system provided with a plurality of sets of outdoor units and a plurality of sets of indoor units, finer control is required to improve the stability of the entire unit. In this embodiment, the cloud control platform is further configured to generate corresponding upper pressure ratio protection conditions according to different working conditions, so as to fully ensure the working stability of the system.
Specifically, the cloud control platform is configured to:
1. when the setting function belongs to the setting range and the maximum value of the discharge pressure of the compressor belongs to the corresponding discharge pressure setting range, a first pressure ratio upper limit protection condition is generated. In generating the first pressure ratio upper limit protection condition, consider, on the one hand, the compressor functioning: the function is set by the function selection gear, the function selection gear is positively correlated with the performance of the compressor, and when the function selection gear is higher, the function is set higher, and the upper limit of the working frequency of the compressor is also higher. The setting range preferably corresponds to a capacity priority mode, fully exploiting the capacity of the compressor, the compressor performance being close to its own upper limit, for example the setting range may be the case when the function selection gear is in the range 1-3. This allows the compressor to operate in a range of high pressure ratios. In another aspect, the discharge pressure setting range is used for monitoring and determining a current state of the discharge pressure of the compressor, when the discharge pressure of the compressor is higher, the pressure ratio boundary threshold value of the first pressure ratio upper limit protection condition is set smaller, and when the discharge pressure of the compressor is in a non-higher state, the pressure ratio boundary threshold value of the first pressure ratio upper limit protection condition is set larger, and the operation stability of the compressor is ensured while the capacity of the compressor is fully exerted.
2. When the ambient temperature falls within the low temperature range, a second pressure ratio upper limit protection condition is generated. The ambient temperature is detected by a temperature sensor provided in the outdoor unit. The ambient temperature is the temperature of the environment in which the sensor is located, and the ambient temperature can be either air temperature or water temperature because the external medium for heat exchange of the outdoor unit can be water or air. In this embodiment, in order to protect the compressor from frequent start-up and shut-down, the pressure ratio boundary threshold of the second pressure ratio upper limit protection condition is set to be the highest in the low temperature range corresponding to the case where the ambient temperature is low.
3. When the ambient temperature belongs to the high temperature range and the maximum value of the discharge pressure of the compressor belongs to the corresponding discharge pressure setting range, a third pressure ratio upper limit protection condition is generated. The high temperature range corresponds to the situation that the ambient temperature is higher, and the pressure ratio boundary threshold value of the third pressure ratio upper limit protection condition is set to be the lowest for protecting the compressor. In this condition, the discharge pressure set range is also used to monitor and determine the current state of the compressor discharge pressure. When the exhaust pressure of the compressor is higher, the pressure ratio boundary threshold value of the third pressure ratio upper limit protection condition is set to be smaller, and when the exhaust pressure of the compressor is in a non-higher state, the pressure ratio boundary threshold value of the third pressure ratio upper limit protection condition is set to be larger, so that the capacity of the compressor is fully exerted, and meanwhile, the operation stability of the compressor is ensured.
4. When the setting function does not belong to the setting range and the maximum value of the exhaust pressure of the compressor belongs to the corresponding exhaust pressure setting range, and the environment temperature does not belong to the low temperature range and does not belong to the high temperature range, a fourth pressure ratio upper limit protection condition is generated. The fourth pressure ratio upper limit protection condition corresponds to a common operating condition, and under such conditions, the discharge pressure set range is also used to monitor and determine the current state of the compressor discharge pressure. When the exhaust pressure of the compressor is higher, the pressure ratio boundary threshold value of the fourth pressure ratio upper limit protection condition is set to be smaller, and when the exhaust pressure of the compressor is in a non-higher state, the pressure ratio boundary threshold value of the fourth pressure ratio upper limit protection condition is set to be larger, so that the capacity of the compressor is fully exerted, and meanwhile, the operation stability of the compressor is ensured.
To improve the robustness of the system, avoiding frequent fluctuations at the boundary threshold, the cloud control platform is configured to track the trend of the change in the maximum value of the pressure ratio and to perform return difference control when determining whether the corresponding pressure ratio upper limit protection condition is established. As shown in FIG. 3, four sequentially increasing pressure ratio boundaries are set in each compressor discharge pressure maximum protection conditionThreshold epsilon h1 、ε h2 、ε h3 、ε h4 . During operation, if the pressure ratio is at maximum ε max Less than epsilon h1 The cloud control platform outputs a protection instruction to keep the current running state of the compressor, namely, the current running state of the compressor is maintained, namely, the running state of the cloud control platform is the same as that of a traditional air conditioning system, the frequency of the compressor is controlled based on the deviation of the set temperature and the real-time temperature, and the heating or refrigerating effect is guaranteed. During operation epsilon max May be at epsilon h1 Nearby fluctuation, in order to avoid the reduction of the stability of the unit caused by frequent generation of different protection instructions by the system, the cloud control platform is configured to set epsilon max Not greater than epsilon h2 And outputting a protection instruction to keep the current running state of the compressor. And if the pressure ratio is the maximum epsilon max The occurrence is greater than or equal to epsilon h2 In the case of (2), the cloud control platform, i.e., the output protection command, prohibits the compressor frequency from rising and only permits the compressor frequency to fall. After entering the frequency prohibition rising interval, even ε max Down to less than epsilon h2 Provided that it is greater than epsilon h1 The cloud control platform keeps outputting a protection instruction to prohibit the frequency of the compressor from rising. If during operation a maximum value of pressure ratio ε is monitored max Epsilon is greater than or equal to h4 The cloud control platform outputs a protection instruction to forcedly control the frequency of the compressor to be reduced; as the compressor frequency decreases, the pressure ratio maximum ε max Will also decrease until it falls below ε h3 And then, the cloud control platform outputs a protection instruction to prohibit the frequency of the compressor from rising and only allow the frequency of the compressor to fall. After entering the frequency rise prohibition region, even ε max The rising again occurs as long as it is less than epsilon h4 The cloud control platform outputs a protection instruction to prohibit the frequency of the compressor from rising and only allow the frequency of the compressor to fall. And if epsilon max At the same time satisfy epsilon or more h2 And less than or equal to epsilon h3 The cloud control platform outputs a protection instruction to prohibit the frequency of the compressor from rising and only allow the frequency of the compressor to fall.
Preferably, the first pressure ratio upper limit guard condition, the second pressure ratio upper limit guard condition, and the fourth pressure ratio upper limit guardThe pressure ratio boundary threshold values in the guard condition, the third pressure ratio upper limit guard condition are sequentially decreased, and priorities of the first pressure ratio upper limit guard condition, the second pressure ratio upper limit guard condition, the third pressure ratio upper limit guard condition and the fourth pressure ratio upper limit guard condition are sequentially decreased. At the time of setting four sequentially increasing pressure ratio boundary thresholds epsilon h1 、ε h2 、ε h3 、ε h4 A set of selectable values for the first pressure ratio upper limit guard condition, the second pressure ratio upper limit guard condition, the third pressure ratio upper limit guard condition, and the fourth pressure ratio upper limit guard condition are shown in table 1, wherein T amin At ambient temperature, P dmax Is the maximum compressor discharge pressure. If P dmax ＞3.1MP a Then consider P dmax Belonging to the corresponding first exhaust pressure setting range; if 3.1MP a ≥P dmax ≥2.6MP a Then consider P dmax Belonging to the corresponding second exhaust pressure setting range; if T amin If the temperature is less than or equal to-10 ℃, the ambient temperature is considered to be in a low temperature range; if T amin If the temperature is equal to or higher than 40 ℃, the ambient temperature is considered to be in a high temperature range.
TABLE 1
In order to prevent the scroll of the compressor from being separated in a synchronous or sequential operation with the upper pressure ratio limit protection condition, the cloud control platform is further configured to receive the operation states of the plurality of outdoor units and to invoke another compressor protection condition, i.e., the lower pressure ratio limit protection condition. Specifically, the suction pressure and the discharge pressure of the compressor are received at a set frequency during a set period, the pressure ratio is calculated, and the pressure ratio minimum ε is determined and monitored min The method comprises the steps of carrying out a first treatment on the surface of the And further, according to the operation state of the outdoor unit, invoking the pressure ratio lower limit protection condition, judging whether the pressure ratio lower limit protection condition is met, and outputting a protection instruction to keep the current operation state of the compressor, or prohibiting the frequency of the compressor from decreasing or controlling the frequency of the compressor to increase when the pressure ratio lower limit protection condition is met. Setting a periodAnd the setting frequency may be set according to the data processing capabilities of the internal controller and the sensor, and is not further defined herein. Similarly, to improve system robustness, avoiding frequent fluctuations at the boundary threshold, the cloud control platform is configured to track the trend of change in the pressure ratio minimum value and perform return difference control when determining whether the pressure ratio lower limit protection condition is established. As shown in fig. 4, three pressure ratio boundary thresholds, namely 2.0, 1.9 and 1.8, are set in the pressure ratio lower protection condition. During operation, if the pressure ratio is at a minimum ε min The cloud control platform outputs protection instructions to keep the current running state of the compressor, wherein the protection instructions are more than or equal to 2.0; if a pressure ratio minimum ε is detected min The frequency of the cloud control platform, namely the output protection instruction, is forcedly controlled to rise by the compressor, namely the pressure ratio minimum epsilon, is smaller than or equal to 1.8 min And will rise. During the rising process, as long as epsilon min Still less than 1.9, the cloud control platforms all keep the output protection instruction to forcedly control the frequency of the compressor to rise unchanged, and if epsilon min And when the frequency of the compressor is increased to be more than or equal to 1.9, the cloud control platform outputs a protection instruction to prohibit the frequency of the compressor from being reduced, and only the frequency of the compressor is allowed to be increased. In the interval where the compressor frequency is prohibited from decreasing, if ε min Again, if the output protection command is smaller than 1.9, the output protection command is kept to prohibit the frequency of the compressor from decreasing as long as the output protection command is larger than 1.8; and if epsilon min When the temperature is higher than 2.0, the cloud control platform outputs a protection instruction to restore and maintain the current running state of the compressor, for example, the running frequency of the compressor is calculated according to the temperature difference between the set temperature and the ambient temperature; at epsilon min After rising to more than 2.0, as long as epsilon min And the current running state of the compressor is kept by the cloud control platform which outputs protection instructions no longer smaller than 1.8 so as to keep the system stable.
In a mode of synchronous or sequential operation with the upper pressure ratio limit protection condition and the lower pressure ratio limit protection condition, in order to lighten the impact sound when the unit is stopped, prepare for the restarting condition or cope with the operation transition variation, always keep the discharge pressure of the compressor within the allowable range, the cloud control platform is configured to: receiving discharge pressure P of compressor at set frequency in set period d Determining and monitoring a compressorMaximum exhaust pressure P dmax The method comprises the steps of carrying out a first treatment on the surface of the And generating a maximum protection condition of the compressor discharge pressure according to the running state of the outdoor unit, judging whether the corresponding maximum protection condition of the compressor discharge pressure is met, and outputting a protection instruction to keep the current running state of the compressor, inhibit the frequency of the compressor from rising or control the frequency of the compressor to fall when the maximum protection condition of the compressor discharge pressure is met. The setting period and setting frequency may be set according to the data processing capabilities of the internal controller and the sensor and are not further defined herein.
For air conditioning systems having even multiple sets of outdoor units and multiple sets of indoor units, finer control is also preferable to keep the system stable. In this embodiment, the cloud control platform is further configured to generate corresponding maximum protection conditions for the compressor discharge pressure according to different working conditions. Fully ensures the stable operation of the system. Specifically, the cloud control platform is configured to:
1. when the setting function falls within the first setting range, a first compressor discharge pressure maximum protection condition is generated. Wherein, the setting function is realized through the function selection gear, the function selection gear is positively correlated with the performance of the compressor, and when the function selection gear is higher, the setting function is higher, and the upper limit of the working frequency of the compressor is also higher. For example, the first setting range is preferably associated with a limited-capability mode, and the first setting range may be a case where the function selection gear is 1-3.
2. And when the setting function belongs to the second setting range, generating a second compressor discharge pressure maximum protection condition. The setting function corresponding to the second setting range is higher than the setting function corresponding to the first setting range, and the second setting range may be a case where the function selection gear is at 4.
3. When the air conditioning system is operating in a defrost preparation state, a third compressor discharge pressure maximum protection condition is generated.
4. When the air conditioning system is operating in a cooling mode, a fourth compressor discharge pressure maximum protection condition is generated.
5. When the air conditioning system is operating in the heating mode, a fifth compressor discharge pressure maximum protection condition is generated.
Preferably, the compressor discharge pressure boundary threshold values in the second compressor discharge pressure maximum value protection condition, the first compressor discharge pressure maximum value protection condition, the fourth compressor discharge pressure maximum value protection condition, and the third compressor discharge pressure maximum value protection condition are sequentially decreased, and the compressor discharge pressure boundary threshold values in the first compressor discharge pressure maximum value protection condition and the fifth compressor discharge pressure maximum value protection condition are the same. A set of selectable values for the first compressor discharge pressure maximum protection condition, the second compressor discharge pressure maximum protection condition, the third compressor discharge pressure maximum protection condition, the fourth compressor discharge pressure maximum protection condition, and the fifth compressor discharge pressure value protection condition are shown in table 2. In generating the compressor discharge pressure maximum value protection condition, it is preferable to disregard the installation height difference between the indoor unit and the outdoor unit.
TABLE 2
Similarly, to improve system robustness, avoiding frequent fluctuations at boundary thresholds, the cloud control platform is configured to perform return difference control according to a trend of change in compressor discharge pressure when determining whether or not each compressor discharge pressure maximum protection condition is satisfied. As shown in fig. 5, three sequentially increasing compressor discharge pressure boundary thresholds P are set for each of the compressor discharge pressure maximum protection conditions c 、P n 、P dw . During operation, the cloud control platform outputs a protection instruction to maintain the current operation state of the compressor and monitor the maximum value P of the exhaust pressure of the compressor dmax The method comprises the steps of carrying out a first treatment on the surface of the If P is monitored dmax P is greater than or equal to dw The cloud control platform outputs a protection instruction to forcibly control the frequency of the compressor to be reduced, namely P dmax Beginning to descend; during the descent, as long as P dmax Greater than P n I.e. maintaining the output protection command forcing the compressor frequency down, if P dmax Less than or equal to P n The cloud control platform outputs a protection instruction to prohibit the frequency of the compressor from rising, only allows the frequency of the compressor to fall, and if P is the value in the interval of prohibiting the frequency of the compressor from rising dmax Reappearance of greater than P n As long as it is no longer equal to or greater than P dw Maintaining the output protection instruction to prohibit the frequency of the compressor from rising; if P is monitored dmax Less than P c The cloud control platform outputs a protection instruction to resume maintaining the current operation state of the compressor, for example, the operation frequency of the compressor is calculated according to the temperature difference between the set temperature and the ambient temperature, and the operation frequency is reduced to be less than P c After that, only P dmax Less than P dw The cloud control platform outputs protection instructions to keep the current running state of the compressor so as to keep the system stable.
In order to protect the mechanism such as a fuse, a frequency conversion device protector and the like of the unit from being burnt in a synchronous or sequential operation mode with the upper pressure ratio limit protection condition, the lower pressure ratio limit protection condition and the maximum compressor discharge pressure protection condition, the cloud control platform is further configured to generate one compressor protection condition, namely a secondary current upper limit protection condition, according to the working parameters and the running state of the outdoor unit, namely the compressor when the current is overlarge. Specifically: the cloud control platform receives the secondary current of the frequency conversion device according to the set frequency in a set period; determining and monitoring the maximum value of the secondary current; generating a secondary current upper limit protection condition according to the characteristics of the compressor and the power supply state, judging whether the corresponding secondary current upper limit protection condition is met, and outputting a protection instruction to keep the current running state of the compressor, inhibit the frequency of the compressor from rising or control the frequency of the compressor to fall when the secondary current upper limit protection condition is met.
Specifically, the secondary current of the inverter device is specifically the secondary current of the inverter board (also referred to as an inverter control board), that is, the input current supplied to the compressor. In the running process of the unit, the cloud control platform is further provided due to different power supply voltage states and different types of the frequency conversion devicesThe control method is configured to generate corresponding secondary current upper limit protection conditions according to different compressor characteristics and power supply states, so that the control is more accurate. Specifically, the secondary current upper limit protection condition generated by the cloud control platform at least comprises four secondary current boundary thresholds I which are sequentially increased 1 -K ideg ,I 2 -K ideg ,I 3 -K ideg And I 4 -K ideg Wherein I 1 、I 2 、I 3 And I 4 Is the current coefficient, K ideg Is a correction coefficient. The current coefficient is preferably retrieved by the cloud control platform from pre-stored data based on compressor characteristics. For example, I is stored in a storage unit of the cloud control platform communication connection 1 、I 2 、I 3 And I 4 And a list corresponding to the types of the frequency converters carried by the compressors one by one. An alternative number is shown in table 3:
TABLE 3 Table 3
The cloud control platform further calls a correction coefficient K according to the current power state ideg . For a standard power supply rated at 380V-415V, an alternative list of correction factor values is shown in table 4:
| normally control | 0.0 |
| Retraction control | 1.0 |
| Unbalance of power supply | 7.0 |
TABLE 4 Table 4
The retraction control refers to a starting state of the compressor in which the compressor is stopped and restarted, the situation is caused by abnormal situations, and the power unbalance comprises the situation that the phase voltage is unbalanced and the phase is lost, and the current coefficient is required to be effectively corrected through the correction coefficient in order to ensure the safe operation of the system.
Also based on the need to improve the robustness of the system, the cloud control platform is configured to track the trend of the change in the secondary current maximum value linv2max and perform return difference control when determining whether the corresponding secondary current upper limit protection condition is satisfied. As shown in the figure, in the operation process, if the maximum value of the secondary current linv2max is less than or equal to I 1 -K ideg The cloud control platform outputs protection instructions to keep the current running state of the compressor, namely, the current running state of the compressor is maintained, namely, the running state of the compressor is kept the same as that of a traditional air conditioning system, the frequency of the compressor is controlled based on the deviation of the set temperature and the real-time temperature, and the air conditioning effect is guaranteed. During operation, the maximum value of the secondary current, linv2max, may be at I 1 -K ideg Nearby fluctuation, in order to avoid unstable operation caused by frequent generation of different protection instructions by the system, as long as the linv2max does not appear to be greater than or equal to I 2 -K ideg The cloud control platform outputs a protection instruction to keep the current running state of the compressor. And if the maximum link 2max of the secondary current is larger than or equal to I 2 -K ideg In the case of (2), the cloud control platform, i.e., the output protection command, prohibits the compressor frequency from rising and only permits the compressor frequency to fall. After entering the frequency-up prohibition interval, even if the linv2max falls and becomes smaller than I 2 -K ideg So long as it is not less than I 1 -K ideg The cloud control platform outputs a protection instruction to prohibit the frequency of the compressor from rising and only allow the frequency of the compressor to fall. If the maximum value of the secondary current linv2max is greater than I 4 -K ideg The cloud control platform outputs a protection instruction to forcedly control the frequency of the compressor to drop, and in the process of the frequency drop of the compressor, the linv2max also drops until the frequency drop is less than or equal to I 3 -K ideg And then, the method is carried out. The cloud control platform outputs a protection instruction to prohibit the frequency of the compressor from rising and only allows the frequency of the compressor to fall. After entering the frequency rise prohibition region, even if the linv2max rises and becomes larger than I 3 -K ideg Provided that it is less than I 4 -K ideg The cloud control platform outputs a protection instruction to prohibit the frequency of the compressor from rising and only allow the frequency of the compressor to fall. And if the linv2max is simultaneously greater than or equal to I 2 -K ideg And is less than or equal to I 3 -K ideg The cloud control platform outputs a protection instruction to prohibit the frequency of the compressor from rising and only allow the frequency of the compressor to fall.
The cloud control platform has strong data processing capability, so that the complex control logic can be ensured to be implemented and have ideal response speed. However, due to the synchronous determination or sequential determination of the upper pressure ratio limit protection condition, the lower pressure ratio limit protection condition, the maximum discharge pressure protection condition of the compressor, and the upper secondary current limit protection condition, two protection instructions may be generated simultaneously in the same interval period, and to cope with this, at least two priority orders of the protection instructions are established in the cloud control platform, and a priority policy matrix is established with the two priority orders as a row and a column, and when the protection instructions collide, the control of the compressor is performed according to the priority policy matrix. An alternative priority policy matrix is shown in table 5.
TABLE 5
The "forced falling" corresponds to a protection instruction for controlling the compressor frequency to fall, the "forced rising" corresponds to a protection instruction for controlling the compressor frequency to rise, the "rising prohibition" corresponds to a protection instruction for prohibiting the compressor frequency to rise, and the "falling prohibition" corresponds to a protection instruction for prohibiting the compressor frequency to fall. It should be noted that, the prohibition of the increase and the prohibition of the decrease of the compressor frequency refer to prohibition of the increase and prohibition of the decrease on the predetermined compressor frequency algorithm, which may be a fuzzy control algorithm or a PID control algorithm, and are well known in the art, and are not described herein.
As shown, the cloud control platform may send parallel instructions to the compressors in each outdoor unit, which are operated according to different protection instructions, respectively.
According to the air conditioning system provided by the invention, a complex protection algorithm can be operated on the first aspect, and meanwhile, a sensing system consisting of a plurality of sensors which are numerous and complicated can be dealt with; the bottleneck that the local MCU can only run a simple algorithm can be solved, and the cloud control platform can meet and improve the real-time requirement of an air conditioning system; the third aspect can realize asynchronous control and data acquisition, reduce disaster recovery risk, the cloud control platform can automatically calculate the protection instruction of the compressor according to an algorithm as long as the outdoor unit is provided with data of the running state of the passage table, realize asynchronous control, and avoid the time period of network congestion; the fourth aspect can ensure that each outdoor unit in the system operates stably.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (7)
1. An air conditioning system, comprising:
a plurality of outdoor units in which a refrigerant circuit portion capable of operating a refrigeration cycle is provided, the refrigerant circuit having a compressor disposed therein;
characterized by further comprising:
the cloud control platform is configured to receive working parameters and running states of the plurality of outdoor units according to a set frequency, generate or call at least one compressor protection condition according to the received working parameters and running states, judge whether the protection condition of the corresponding compressor is met or not, and generate and output a protection instruction to control the operation of the compressor when the protection condition is met; the working parameters and the running states comprise a setting function, an ambient temperature, a maximum value of the exhaust pressure of the compressor, a maximum value of the pressure ratio, a minimum value of the pressure ratio, a defrosting preparation state of the air conditioning system, a refrigerating mode, a heating mode and secondary current of the frequency conversion device; the cloud control platform is configured to establish at least two priority orders of a plurality of protection instructions, establish a priority strategy matrix by taking the two priority orders as rows and columns, and execute control on the compressor according to the priority strategy matrix when two protection instructions are generated simultaneously in the same interval period and the protection instructions collide;
the cloud control platform receives working parameters and operation states of a plurality of outdoor units according to a set frequency, and the cloud control platform comprises: receiving suction pressure and discharge pressure of the compressor, and calculating a pressure ratio; determining and monitoring a pressure ratio maximum; generating a pressure ratio upper limit protection condition according to the operation state of the outdoor unit, judging whether the corresponding pressure ratio upper limit protection condition is met, and outputting a protection instruction to maintain the current operation state of the compressor, inhibit the frequency of the compressor from rising or control the frequency of the compressor from falling when the pressure ratio upper limit protection condition is met; wherein generating the pressure ratio upper limit protection condition according to the operation state of the outdoor unit includes:
when the setting function belongs to a setting range and the maximum value of the exhaust pressure of the compressor belongs to a corresponding exhaust pressure setting range, generating a first pressure ratio upper limit protection condition;
when the ambient temperature belongs to the low temperature range, generating a second pressure ratio upper limit protection condition;
when the ambient temperature belongs to a high temperature range and the maximum value of the exhaust pressure of the compressor belongs to a corresponding exhaust pressure setting range, generating a third pressure ratio upper limit protection condition;
when the setting function does not belong to the setting range and the maximum value of the exhaust pressure of the compressor belongs to the corresponding exhaust pressure setting range, and the environment temperature does not belong to the low temperature range and does not belong to the high temperature range, generating a fourth pressure ratio upper limit protection condition;
the pressure ratio boundary threshold values in the first pressure ratio upper limit protection condition, the second pressure ratio upper limit protection condition, the fourth pressure ratio upper limit protection condition and the third pressure ratio upper limit protection condition are sequentially decreased.
2. An air conditioning system according to claim 1, wherein:
the cloud control platform is further configured to:
receiving suction pressure and discharge pressure of the compressor, and calculating a pressure ratio;
determining and monitoring a pressure ratio minimum;
and calling a pressure ratio lower limit protection condition according to the running state of the outdoor unit, judging whether the corresponding pressure ratio lower limit protection condition is met, and outputting a protection instruction to keep the current running state of the compressor, inhibit the frequency of the compressor from decreasing or control the frequency of the compressor to increase when the pressure ratio lower limit protection condition is met.
3. An air conditioning system according to claim 1, wherein:
the cloud control platform receives working parameters and operation states of a plurality of outdoor units according to the set frequency, and the cloud control platform further comprises:
receiving a discharge pressure of the compressor;
the cloud control platform is further configured to:
determining and monitoring a compressor discharge pressure maximum;
and generating a maximum protection condition of the compressor discharge pressure according to the running state of the outdoor unit, judging whether the corresponding maximum protection condition of the compressor discharge pressure is met, and outputting a protection instruction to keep the current running state of the compressor, inhibit the frequency of the compressor from rising or control the frequency of the compressor to fall when the maximum protection condition of the compressor discharge pressure is met.
4. An air conditioning system according to claim 1, wherein:
the cloud control platform is configured to:
generating a first compressor discharge pressure maximum protection condition when the setting function falls within a first setting range;
generating a second compressor discharge pressure maximum protection condition when the set function falls within a second set range;
generating a third compressor discharge pressure maximum protection condition when the air conditioning system is operating in a defrost readiness state;
when the air conditioning system works in a refrigeration mode, generating a maximum protection condition of the exhaust pressure of the fourth compressor;
generating a fifth compressor discharge pressure maximum protection condition when the air conditioning system is operating in the heating mode;
the compressor discharge pressure boundary threshold values in the second compressor discharge pressure maximum value protection condition, the first compressor discharge pressure maximum value protection condition, the fourth compressor discharge pressure maximum value protection condition and the third compressor discharge pressure maximum value protection condition are sequentially decreased, and the compressor discharge pressure boundary threshold values of the first compressor discharge pressure maximum value protection condition and the fifth compressor discharge pressure maximum value protection condition are the same; the setting function corresponding to the second setting range is higher than the setting function corresponding to the first setting range.
5. An air conditioning system according to claim 1, wherein:
the cloud control platform receives working parameters and operation states of a plurality of outdoor units according to the set frequency, and the cloud control platform further comprises:
receiving secondary current of the frequency conversion device;
the cloud control platform is further configured to:
determining and monitoring the maximum value of the secondary current;
generating a secondary current upper limit protection condition according to the characteristics of the compressor and the power supply state, judging whether the corresponding secondary current upper limit protection condition is met, and outputting a protection instruction to keep the current running state of the compressor, inhibit the frequency of the compressor from rising or control the frequency of the compressor to fall when the secondary current upper limit protection condition is met.
6. An air conditioning system according to claim 1, wherein:
the cloud control platform is configured to track the trend of change of the pressure ratio maximum value, the pressure ratio minimum value, the compressor discharge pressure maximum value, and the secondary current maximum value, respectively, and to execute return difference control when determining whether the corresponding pressure ratio upper limit protection condition, the corresponding pressure ratio lower limit protection condition, the corresponding compressor discharge pressure maximum value protection condition, or the corresponding secondary current upper limit protection condition is established.
7. An air conditioning system according to claim 1, wherein:
the outdoor unit is also provided with a remote communication module, wherein the remote communication module is an NB-IoT wireless communication module, and the NB-IoT wireless communication module is in communication connection with the cloud control platform.
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