Compressor control method, apparatus, and system for multi-module machine set

Abstract

The application discloses a kind of compressor control method, device and system of multi-module unit.The compressor control method of multi-module unit includes: monitoring the water temperature of the water inlet temperature of multi-module unit;Judge whether the water temperature change rate of water inlet temperature satisfies preset change rate;Preset change rate is used to determine whether there is buffer water tank in multi-module unit;When the water temperature change rate of water inlet temperature satisfies preset change rate, with preset control logic controls compressor operation.The technical scheme of the embodiment of the application can improve user experience effect.

Description

Technical Field

[0001] This invention relates to the field of multi-module unit technology, and in particular to a compressor control method, device and system for multi-module units. Background Technology

[0002] As people's requirements for environmental temperature comfort increase, multi-module unit interconnection is widely used. During use, users are usually required to equip the system with a buffer water tank to avoid large fluctuations in water temperature.

[0003] However, in practical applications, the modular unit will start or stop the compressor according to the corresponding operating requirements, and the compressor start-up and shutdown have certain time limits. If the compressor is not started or shut down within the preset time, it will not start or shut down. If there is no buffer water tank or the configured buffer water tank is too small, the water temperature in the water system will continue to drop or rise, resulting in large fluctuations in the water system temperature. This will cause the unit to be unable to respond quickly to user needs, reducing the user experience. Summary of the Invention

[0004] This invention provides a compressor control method, device, and system for multi-module units to improve user experience.

[0005] According to one aspect of the present invention, a compressor control method for a multi-module unit is provided, comprising:

[0006] Monitor the inlet water temperature of the multi-module unit;

[0007] Determine whether the rate of change of the inlet water temperature meets the preset rate of change; the preset rate of change is used to determine whether there is a buffer tank in the multi-module unit.

[0008] When the rate of change of the inlet water temperature meets the preset rate of change, the compressor is controlled to operate using preset control logic.

[0009] Optionally, the preset rate of change includes:

[0010] A first preset rate of change, the first preset rate of change is used to determine that there is a buffer water tank in the multi-module unit;

[0011] The second preset rate of change is used to determine that there is no buffer water tank in the multi-module unit.

[0012] Optionally, determining whether the rate of change of the inlet water temperature meets a preset rate of change includes:

[0013] When the absolute value of the rate of change of the inlet water temperature is less than a preset value, it is determined that the rate of change of the inlet water temperature satisfies the first preset rate of change.

[0014] When the rate of change of the inlet water temperature meets the preset rate of change, the compressor is controlled to operate using preset control logic, including:

[0015] When the rate of change of the inlet water temperature meets the first preset rate of change, the compressor is controlled to operate using the first control logic.

[0016] Optionally, the multi-module unit includes multiple compressor modules, and each compressor module includes at least one compressor;

[0017] When the rate of change of the inlet water temperature meets the first preset rate of change, controlling the compressor to operate using the first control logic includes:

[0018] When the rate of change of the inlet water temperature meets the first preset rate of change, the current operating requirements of the multi-module unit are obtained; the operating requirements include loading requirements or unloading requirements.

[0019] When the current operating demand of the multi-module unit is the loading demand, the compressors in each compressor module are controlled to start sequentially.

[0020] When the current operating demand of the multi-module unit is the load reduction demand, the compressors in each compressor module are controlled to shut down sequentially.

[0021] Optionally, each of the compressor modules includes multiple compressors;

[0022] When the current operating demand of the multi-module unit is the loading demand, the compressors in each compressor module are controlled to start sequentially, including:

[0023] When the current operating demand of the multi-module unit is the loading demand, the first compressor in the first compressor module is controlled to increase its frequency.

[0024] If the first compressor in the first compressor module does not meet the loading requirements when it reaches the maximum frequency, then the second compressor in the first compressor module is controlled to increase its frequency until the last compressor in the first compressor module reaches the maximum frequency.

[0025] If the loading requirement is still not met when the last compressor in the Nth compressor module reaches its maximum frequency, then the first compressor in the (N+1)th compressor module is controlled to increase its frequency until the last compressor in the last compressor module reaches its maximum frequency; N is an integer greater than or equal to 1.

[0026] When the current operating demand of the multi-module unit is the load reduction demand, the compressors in each compressor module are controlled to shut down sequentially, including:

[0027] When the current operating demand of the multi-module unit is a load reduction demand, the first compressor in the first compressor module is controlled to reduce its frequency.

[0028] If the first compressor in the first compressor module does not meet the load reduction requirement when its frequency is reduced to the minimum frequency, then the second compressor in the first compressor module is controlled to reduce its frequency until the last compressor in the first compressor module reduces its frequency to the minimum frequency.

[0029] If the load reduction requirement is still not met when the last compressor in the Nth compressor module is reduced to the minimum frequency, then the first compressor in the (N+1)th compressor module is controlled to reduce its frequency until the last compressor in the last compressor module is reduced to the minimum frequency; N is an integer greater than or equal to 1.

[0030] Optionally, determining whether the rate of change of the inlet water temperature meets a preset rate of change further includes:

[0031] If the compressor is turned on or off a preset number of times, and the compressor is turned on or off for a preset time each time, and the absolute value of the rate of change of the inlet water temperature is greater than or equal to the preset value, then it is determined that the rate of change of the inlet water temperature satisfies the second preset rate of change.

[0032] When the rate of change of the inlet water temperature meets the preset rate of change, the compressor is controlled to operate using preset control logic, including:

[0033] When the rate of change of the inlet water temperature meets the second preset rate of change, the compressor is controlled to operate using the second control logic.

[0034] Optionally, the multi-module unit includes multiple compressor modules, and each compressor module includes at least one compressor;

[0035] When the rate of change of the inlet water temperature meets the second preset rate of change, the compressor is controlled to operate using the second control logic, including:

[0036] When the rate of change of the inlet water temperature meets the second preset rate of change, the current operating requirements of the multi-module unit are obtained; the operating requirements include loading requirements or unloading requirements.

[0037] When the current operating demand of the multi-module unit is the loading demand, control all compressors in each compressor module to increase their frequency;

[0038] When the current operating demand of the multi-module unit is the load reduction demand, all compressors in each compressor module are controlled to reduce their frequency.

[0039] Optionally, when the current operating demand of the multi-module unit is the loading demand, controlling all compressors in each compressor module to increase their frequency includes:

[0040] When the current operating demand of the multi-module unit is the loading demand, all compressors in each compressor module are controlled to increase their frequency from the minimum frequency.

[0041] According to another aspect of the present invention, a compressor control device for a multi-module unit is provided, comprising:

[0042] The detection module is used to monitor the inlet water temperature of the multi-module unit;

[0043] The judgment module is used to determine whether the rate of change of the inlet water temperature meets the preset rate of change; the preset rate of change is used to determine whether there is a buffer water tank in the multi-module unit.

[0044] The control module is used to control the compressor to operate using preset control logic when the rate of change of the inlet water temperature meets the preset rate of change.

[0045] According to another aspect of the present invention, a compressor control system for a multi-module unit is provided, comprising multiple compressor modules, wherein the multiple compressor modules are connected in series.

[0046] The technical solution of this invention determines whether a buffer tank exists in the multi-module unit by judging whether the rate of change of the inlet water temperature meets a preset rate of change. This allows for the use of different control logics to control the compressor operation under different conditions, enabling the multi-module unit to adapt to on-site conditions, thus enhancing its adaptability and improving energy efficiency. Furthermore, by adaptively controlling the compressor with different control logics, the compressor load can be more balanced, extending its service life and reducing maintenance costs. Simultaneously, by adaptively selecting different control logics based on actual conditions, this embodiment minimizes water temperature fluctuations during compressor start-up and shutdown, thereby improving the user experience.

[0047] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 A flowchart illustrating a compressor control method for a multi-module unit according to an embodiment of the present invention;

[0050] Figure 2 A flowchart illustrating another compressor control method for a multi-module unit according to an embodiment of the present invention;

[0051] Figure 3 A flowchart illustrating another compressor control method for a multi-module unit according to an embodiment of the present invention;

[0052] Figure 4 A flowchart illustrating another compressor control method for a multi-module unit according to an embodiment of the present invention;

[0053] Figure 5 A flowchart illustrating another compressor control method for a multi-module unit according to an embodiment of the present invention;

[0054] Figure 6 A flowchart illustrating another compressor control method for a multi-module unit according to an embodiment of the present invention;

[0055] Figure 7A flowchart illustrating another compressor control method for a multi-module unit according to an embodiment of the present invention;

[0056] Figure 8 This is a schematic diagram of the structure of a compressor control device for a multi-module unit according to an embodiment of the present invention. Detailed Implementation

[0057] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0058] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and their variations, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0059] This invention provides a compressor control method for a multi-module unit. This method determines different control logics to control the compressor operation based on the presence or absence of a buffer water tank. This method can be executed by a compressor control device for the multi-module unit, which can be implemented in hardware and / or software.

[0060] Figure 1 A flowchart of a compressor control method for a multi-module unit according to an embodiment of the present invention is provided, with reference to... Figure 1 The compressor control methods for multi-module units include:

[0061] S101. Monitor the inlet water temperature of the multi-module unit.

[0062] A multi-module unit can be understood as a device composed of multiple independent but cooperating compressor modules, which work together to provide the required functions. For example, multi-module units can be applied in air conditioning systems, where each compressor module can start and stop independently as needed, providing flexible adjustment capabilities while ensuring the overall system's efficiency and reliability. Furthermore, the air conditioning system also includes a main water circuit connecting the various module units. The main water circuit includes a water pump, inlet pipe, and outlet pipe. The inlet pipe delivers chilled / hot water from the main water circuit to the multi-module unit, which regulates the water temperature by cooling or heating the water. The outlet pipe returns the treated chilled / hot water from the multi-module unit to the main water circuit, forming a complete water circulation system.

[0063] Specifically, the inlet water temperature of the multi-module unit can be obtained by monitoring the real-time temperature of the inlet pipe in the main water circuit. For example, a water temperature sensor can be installed in the multi-module unit to monitor the real-time inlet water temperature during the operation of the multi-module unit.

[0064] S102. Determine whether the rate of change of the inlet water temperature meets the preset rate of change; the preset rate of change is used to determine whether there is a buffer water tank in the multi-module unit.

[0065] The rate of change of water temperature refers to the ratio of the difference in inlet water temperature over a certain time interval to that time interval. Whether the rate of change of water temperature meets the preset rate of change can be understood as the relationship between the rate of change of water temperature and the preset value during the switching between the start-up and shutdown states of a multi-module unit. For example, if the rate of change of water temperature is less than the preset value, it indicates that the rate of change of water temperature is small, and the current fluctuation of the unit's inlet water temperature is small. Therefore, it is determined that the rate of change of water temperature meets the first preset rate of change, which can be characterized by the presence of a buffer tank in the unit. If the rate of change of water temperature is greater than or equal to the preset value, and the rate of change of water temperature remains greater than or equal to the preset value after multiple start-ups or shutdowns of the compressor, it indicates that the rate of change of water temperature is large, and the current fluctuation of the unit's inlet water temperature is large. Therefore, it is determined that the rate of change of water temperature meets the second preset rate of change, which can be characterized by the absence of a buffer tank in the unit.

[0066] The buffer tank is used to balance and regulate the water temperature in the water circulation system, playing a role in mitigating temperature fluctuations. For example, the flow rate of cold / hot water in an air conditioning system may fluctuate due to changes in indoor temperature control requirements, causing the multi-modal unit to switch between on and off states. With the buffer tank present, more water can be stored, reducing temperature fluctuations in the system and thus minimizing temperature fluctuations in the overall water circuit, ensuring stable operation of the multi-modal unit.

[0067] S103. When the rate of change of the inlet water temperature meets the preset rate of change, the compressor is controlled to run using the preset control logic.

[0068] The preset control logic determines the control logic corresponding to the compressor based on whether a buffer water tank exists in the multi-module unit.

[0069] Specifically, the compressor control logic in a multi-module unit differs from that in a unit without a buffer tank. For example, when a buffer tank is present, the water temperature fluctuation in the main water circuit is relatively small, allowing the first control logic to control the compressor, which helps save power. However, when a buffer tank is absent, the water temperature fluctuation in the main water circuit is larger. If the first control logic is used to control the compressor, the compressor may not be able to respond quickly enough to high demand from the indoor unit, leading to large water temperature fluctuations and a poor user experience. Therefore, a second control logic, different from the first, is needed to control the compressor in the unit to avoid the impact of water temperature fluctuations caused by the absence of a buffer tank, thereby improving the user experience.

[0070] The technical solution of this invention determines whether a buffer tank exists in the multi-module unit by judging whether the rate of change of the inlet water temperature meets a preset rate of change. This allows for the use of different control logics to control the compressor operation under different conditions, enabling the multi-module unit to adapt to on-site conditions, thus enhancing its adaptability and improving energy efficiency. Furthermore, by adaptively controlling the compressor with different control logics, the compressor load can be more balanced, extending its service life and reducing maintenance costs. Simultaneously, by adaptively selecting different control logics based on actual conditions, this embodiment minimizes water temperature fluctuations during compressor start-up and shutdown, thereby improving the user experience.

[0071] Based on the above embodiments, the preset change rate includes: a first preset change rate and a second preset change rate. The first preset change rate is used to determine that a buffer water tank exists in the multi-module unit, and the second preset change rate is used to determine that a buffer water tank does not exist in the multi-module unit.

[0072] Optionally, the process of determining the first preset rate of change includes: when the absolute value of the rate of change of the inlet water temperature is less than a preset value, determining that the rate of change of the inlet water temperature satisfies the first preset rate of change.

[0073] Optionally, the process of determining the second preset rate of change includes: if the absolute value of the rate of change of the inlet water temperature is greater than or equal to a preset value when the number of times the compressor is turned on or off reaches a preset number and the time for each time the compressor is turned on or off reaches a preset time, then the rate of change of the inlet water temperature is determined to satisfy the second preset rate of change. For example, the preset number of times can be 3, and the preset time can be 1 hour.

[0074] Figure 2 A flowchart of another compressor control method for a multi-module unit according to an embodiment of the present invention is provided, with reference to... Figure 2 Based on the above embodiments, the compressor control method for multi-module units includes:

[0075] S201. Monitor the inlet water temperature of multi-module units.

[0076] S202. Determine whether the absolute value of the rate of change of the inlet water temperature is less than the preset value; if yes, proceed to S203; if no, proceed to S204.

[0077] S203. Determine that the rate of change of the inlet water temperature meets the first preset rate of change.

[0078] S204. When the number of times the compressor is turned on or off reaches a preset number, and the time for each time the compressor is turned on or off reaches a preset time, if the absolute value of the rate of change of the inlet water temperature is greater than or equal to a preset value, then it is determined that the rate of change of the inlet water temperature meets the second preset rate of change.

[0079] Specifically, when the absolute value of the rate of change of the inlet water temperature is less than the preset value, it indicates that the water temperature change in the total water circuit is small, which can be characterized as the presence of a buffer water tank in the multi-module unit.

[0080] When the absolute value of the rate of change of the inlet water temperature is greater than or equal to the preset value, it indicates that the water temperature in the main water circuit is changing significantly. In this case, if the number of times the compressor is turned on or off reaches the preset number, and the time for each time the compressor is turned on or off reaches the preset time, and the absolute value of the rate of change of the water temperature still cannot be made less than the preset value, it can be determined that there is no buffer water tank in the multi-module unit.

[0081] S205, The compressor is controlled to run using the first control logic.

[0082] Specifically, this step involves controlling the compressor to run when the rate of change of the inlet water temperature meets the first preset rate of change.

[0083] S206. The compressor is controlled to run using the second control logic.

[0084] Specifically, when the rate of change of the inlet water temperature meets the second preset rate of change, the compressor is controlled to run by the second control logic.

[0085] Specifically, after determining whether there is a water tank in the unit based on the corresponding preset change rate, different control logics of the compressor can be determined based on different preset change rates, so that the compressor can operate with the optimal control logic under different conditions. This can avoid the situation of unstable water temperature in the water system when there is no buffer water tank, which is conducive to improving the user experience.

[0086] The compressor control method for multi-module units provided in this invention enables multi-module units to adapt to field conditions and control the compressor operation with corresponding control logic, thereby improving the adaptability of multi-module units.

[0087] Figure 3 A flowchart of another compressor control method for a multi-module unit according to an embodiment of the present invention is provided, with reference to... Figure 3 Based on the above embodiments, the multi-module unit includes multiple compressor modules, and each compressor module includes at least one compressor; the compressor control method of the multi-module unit includes:

[0088] S301, Monitor the inlet water temperature of multi-module units.

[0089] S302. When the absolute value of the rate of change of the inlet water temperature is less than a preset value, the rate of change of the inlet water temperature is determined to satisfy the first preset rate of change.

[0090] S303. Determine whether the current operating requirement of the multi-module unit is a loading requirement; if yes, execute S304; if no, execute S305.

[0091] Specifically, this step involves obtaining the current operating requirements of the multi-module unit when the rate of change of the inlet water temperature meets the first preset rate of change; the operating requirements include loading requirements or load reduction requirements.

[0092] Specifically, the current operational requirements can be understood as the load, temperature, and other parameter requirements that the system needs to meet at a specific moment. These requirements may be determined by various factors such as external environmental conditions, load fluctuations, and customer demands, and require each module within the system to dynamically adjust according to these requirements. In this embodiment, the current operational requirements can be understood as the heating or cooling capacity during the current time period.

[0093] Load demand refers to the system needing to increase its load output to meet higher load requirements or system performance demands. For example, if a multi-module unit's target temperature is 50°C, and the current inlet water temperature is 40°C, then the compressor needs to be turned on to provide heating so that the current inlet water temperature reaches the target temperature of 50°C. Load shedding demand refers to the system needing to reduce its load output to prevent system overload and ensure system stability and safety. For example, if a multi-module unit's target temperature is 50°C, and during compressor operation the current inlet water temperature reaches 60°C, then the compressor needs to be turned off to reduce heating so that the current inlet water temperature reaches the target temperature of 50°C.

[0094] S304, control the compressors in each compressor module to start sequentially.

[0095] Specifically, this step involves controlling the compressors in each compressor module to start sequentially when the current operating demand of the multi-module unit is the loading demand.

[0096] Specifically, when the current inlet water temperature of the multi-module unit is lower than the target requirement, the compressor frequency needs to be increased. Since the water temperature fluctuation in the main water circuit is relatively small, a small increase in frequency is sufficient to meet the load requirements. That is, the compressors in each module are controlled to start sequentially. Once the frequency of one compressor increases to the point where the water temperature in the main water circuit meets the requirement, the remaining compressors can be stopped. If, after one compressor is started and increased to its maximum frequency, the water temperature in the main water circuit still does not meet the requirement, the next compressor can be started until the water temperature in the main water circuit meets the requirement.

[0097] S305, Control the compressors in each compressor module to shut down sequentially.

[0098] Specifically, when the current operating demand of the multi-module unit is a load reduction demand, the compressors in each compressor module are controlled to shut down sequentially.

[0099] Specifically, when the current inlet water temperature of the multi-module unit exceeds the target requirement, the compressor frequency needs to be reduced. Since the water temperature fluctuation in the main water circuit is relatively small, a small reduction in frequency is sufficient to meet the load reduction requirement. That is, the compressors in each module are controlled to shut down sequentially. When shutting down a compressor reduces its frequency to the point where the water temperature in the main water circuit meets the requirement, the remaining compressors can be shut down. If, after shutting down a compressor to its minimum frequency, the water temperature in the main water circuit still does not meet the requirement, the next compressor can be shut down until the water temperature in the main water circuit meets the requirement.

[0100] The compressor control method for multi-module units provided in this embodiment of the invention is specifically a flowchart of the multi-module unit running the first control logic according to the first preset change rate, which can reduce water temperature fluctuations in the multi-module unit during start-up and shutdown, and improve user comfort.

[0101] In this embodiment, each compressor module includes at least one compressor; taking an example where each compressor module includes multiple compressors, Figure 4 A flowchart of another compressor control method for a multi-module unit according to an embodiment of the present invention is provided, with reference to... Figure 4 Based on the above embodiments, the compressor control method for multi-module units provided in this embodiment includes:

[0102] S401, Monitor the inlet water temperature of multi-module units.

[0103] S402. When the absolute value of the rate of change of the inlet water temperature is less than a preset value, the rate of change of the inlet water temperature is determined to satisfy the first preset rate of change.

[0104] S403. Determine whether the current operating requirement of the multi-module unit is a loading requirement; if yes, execute S404; if no, execute S407.

[0105] Specifically, this step involves obtaining the current operating requirements of the multi-module unit when the rate of change of the inlet water temperature meets the first preset rate of change; the operating requirements include loading requirements or load reduction requirements.

[0106] S404: Control the first compressor in the first compressor module to increase its frequency.

[0107] Specifically, when the current operating demand of the multi-module unit is the loading demand, the first compressor in the first compressor module is controlled to increase its frequency.

[0108] S405. If the first compressor in the first compressor module does not meet the load requirements when it reaches the maximum frequency, then control the second compressor in the first compressor module to increase its frequency until the last compressor in the first compressor module reaches the maximum frequency.

[0109] S406. When the last compressor in the Nth compressor module reaches its maximum frequency, if the load requirement is still not met, the first compressor in the (N+1)th compressor module is controlled to increase its frequency until the last compressor in the last compressor module reaches its maximum frequency; N is an integer greater than or equal to 1.

[0110] Specifically, because the water temperature fluctuation in the main water circuit is relatively small, the operating demand of the indoor unit is also relatively small. Therefore, the compressors in the multi-module unit can be individually controlled by increasing or decreasing their frequency, or by switching the compressors on and off. For example, a multi-module unit includes three compressor modules, each containing two compressors. When there is a load demand, the first compressor in the first compressor module is first turned on and its frequency is increased. If the target demand is not met when the frequency reaches its maximum, the second compressor in the first compressor module is turned on and its frequency is increased. If the target demand is not met when the frequency reaches its maximum, the first compressor in the second compressor module is turned on and its frequency is increased. If the target demand is not met when the frequency reaches its maximum, the second compressor in the second compressor module is turned on and its frequency is increased. If the target demand is not met when the frequency reaches its maximum, the first compressor in the third compressor module is turned on and its frequency is increased. If the target demand is not met when the frequency reaches its maximum, the second compressor in the third compressor module is turned on.

[0111] S407: Control the first compressor in the first compressor module to reduce its frequency.

[0112] Specifically, when the current operating demand of the multi-module unit is a load reduction demand, the first compressor in the first compressor module is controlled to reduce its frequency.

[0113] S408. If the first compressor in the first compressor module does not meet the load reduction requirement when its frequency is reduced to the minimum frequency, then the second compressor in the first compressor module is controlled to reduce its frequency until the last compressor in the first compressor module reduces its frequency to the minimum frequency.

[0114] S409. When the last compressor in the Nth compressor module reduces its frequency to the minimum frequency, it still does not meet the load reduction requirement. Then, the first compressor in the N+1th compressor module is controlled to reduce its frequency until the last compressor in the last compressor module reduces its frequency to the minimum frequency. N is an integer greater than or equal to 1.

[0115] For example, the multi-module unit includes three compressor modules, each compressor module including two compressors. When there is a load reduction requirement, the first compressor in the first compressor module is first controlled to reduce its frequency. When its frequency is reduced to the minimum frequency, if the target requirement is still not met, the second compressor in the first compressor module is controlled to reduce its frequency. When its frequency is reduced to the minimum frequency, if the target requirement is still not met, the first compressor in the second compressor module is controlled to reduce its frequency. When its frequency is reduced to the minimum frequency, if the target requirement is still not met, the second compressor in the second compressor module is controlled to reduce its frequency. When its frequency is reduced to the minimum frequency, if the target requirement is still not met, the first compressor in the third compressor module is controlled to reduce its frequency. When its frequency is reduced to the minimum frequency, if the target requirement is still not met, the second compressor in the third compressor module is controlled to reduce its frequency.

[0116] Figure 5 A flowchart of another compressor control method for a multi-module unit according to an embodiment of the present invention is provided, with reference to... Figure 5 Based on the above embodiments, the multi-module unit includes multiple compressor modules, and each compressor module includes at least one compressor; the compressor control method of the multi-module unit includes:

[0117] S501, monitors the inlet water temperature of multi-module units.

[0118] S502. When the number of times the compressor is turned on or off reaches a preset number, and the time for each time the compressor is turned on or off reaches a preset time, if the absolute value of the rate of change of the inlet water temperature is greater than or equal to a preset value, then it is determined that the rate of change of the inlet water temperature meets the second preset rate of change.

[0119] S503. Determine whether the current operating requirement of the multi-module unit is a loading requirement; if yes, execute S504; if no, execute S505.

[0120] Specifically, this step involves obtaining the current operating requirements of the multi-module unit when the rate of change of the inlet water temperature meets the second preset rate of change; the operating requirements include loading requirements or load reduction requirements.

[0121] S504 controls all compressors in each compressor module to increase their frequency.

[0122] Specifically, when the current operating demand of the multi-module unit is the loading demand, control all compressors in each compressor module to increase their frequency.

[0123] Specifically, when the current inlet water temperature of the multi-module unit is lower than the target requirement, it first controls all compressor modules to start and increase their frequency.

[0124] Specifically, due to significant fluctuations in the water temperature within the main water circuit, the operating demands of the indoor unit are also substantial. Therefore, the overall frequency of each compressor in the multi-module unit can be increased or decreased. For example, a multi-module unit may consist of three compressor modules, each containing two compressors. When there is a load requirement, all six compressors are controlled to start and operate at their lowest frequency. If this does not meet the target demand, the overall compressor frequency is increased to ensure the current inlet water temperature reaches the target requirement.

[0125] Optionally, when the current operating demand of the multi-module unit is a load demand, control all compressors in each compressor module to increase their frequency, including:

[0126] When the current operating demand of the multi-module unit is the load demand, control all compressors in each compressor module to increase the frequency from the minimum frequency.

[0127] S505 controls all compressors in each compressor module to reduce their frequency.

[0128] Specifically, when the current operating demand of the multi-module unit is a load reduction demand, control all compressors in each compressor module to reduce their frequency.

[0129] Specifically, the compressor frequency can be reduced by using an overall frequency reduction and boosting method. For example, a multi-module unit includes three compressor modules, each of which includes two compressors. When there is a need to reduce the load, the frequency of all six compressors is reduced to ensure that the current inlet water temperature meets the target requirement.

[0130] Figure 6 A flowchart of another compressor control method for a multi-module unit according to an embodiment of the present invention is provided, with reference to... Figure 6 Based on the above embodiments, each compressor module includes multiple compressors; the compressor control method for the multi-module unit includes:

[0131] S601, Monitor the inlet water temperature of multi-module units.

[0132] S602. When the number of times the compressor is turned on or off reaches a preset number, and the time for each time the compressor is turned on or off reaches a preset time, if the absolute value of the rate of change of the inlet water temperature is greater than or equal to a preset value, then it is determined that the rate of change of the inlet water temperature satisfies the second preset rate of change.

[0133] S603. Determine whether the current operating requirement of the multi-module unit is a loading requirement; if yes, execute S604; if no, execute S605.

[0134] Specifically, this step involves obtaining the current operating requirements of the multi-module unit when the rate of change of the inlet water temperature meets the second preset rate of change; the operating requirements include loading requirements or load reduction requirements.

[0135] S604 controls all compressors in each compressor module to increase their frequency.

[0136] Specifically, when the current operating demand of the multi-module unit is the loading demand, control all compressors in each compressor module to increase their frequency.

[0137] S605 controls all compressors in each compressor module to reduce their frequency.

[0138] Specifically, when the current operating demand of the multi-module unit is a load reduction demand, control all compressors in each compressor module to reduce their frequency.

[0139] S606. If the load reduction requirement is still not met after all compressors in each compressor module have reduced their frequency to the minimum frequency, then shut down any one of the compressors.

[0140] S607. When the multi-module unit has a loading requirement, control the compressor that was shut down to start, and control all compressors to increase their frequency as a whole.

[0141] For example, the compressor frequency can be reduced by using an overall frequency ramp-up / reduction method and only shutting down at the lowest frequency. For example, a multi-module unit includes three compressor modules, each with two compressors. When there is a load reduction requirement, all six compressors are controlled to reduce their overall frequency. If the load reduction requirement is still not met after all six compressors have reduced their frequency to the minimum, then one of the compressors is shut down to ensure the current inlet water temperature reaches the target requirement. When a load requirement arises, the shut-down compressor is turned on, and all compressors are controlled to increase their overall frequency to meet the load requirement.

[0142] In another implementation, if the load reduction requirement is still not met after all compressors in each compressor module have reduced their frequency to the minimum frequency, then any one of the compressors is shut down until the multi-module unit has a load requirement. At this point, all the compressors that are currently running can be increased in frequency. If the load requirement is still not met after all the compressors have been increased to the maximum frequency, then the shut-down compressor is turned on and increased from the lowest frequency to meet the load requirement.

[0143] The compressor control method for multi-module units provided in this embodiment of the invention is specifically a flowchart of the multi-module unit running the second control logic according to the second preset change rate, which can reduce water temperature fluctuations in the multi-module unit during start-up and shutdown, and improve user comfort.

[0144] Figure 7A flowchart of another compressor control method for a multi-module unit according to an embodiment of the present invention is provided, with reference to... Figure 7 Based on the above embodiments, the compressor control method for multi-module units includes:

[0145] S701, monitors the inlet water temperature of multi-module units.

[0146] S702. Determine whether the absolute value of the rate of change of the inlet water temperature is less than the preset value; if yes, execute S703; if no, execute S704.

[0147] S703, Determine that the rate of change of the inlet water temperature meets the first preset rate of change.

[0148] Specifically, this step involves determining that the rate of change of the inlet water temperature satisfies the first preset rate of change when the absolute value of the rate of change of the inlet water temperature is less than a preset value.

[0149] S704. When the number of times the compressor is turned on or off reaches a preset number, and the time for each time the compressor is turned on or off reaches a preset time, if the absolute value of the rate of change of the inlet water temperature is greater than or equal to a preset value, then it is determined that the rate of change of the inlet water temperature meets the second preset rate of change.

[0150] S705. If the rate of change of the inlet water temperature meets the first preset rate of change, determine whether the current operating demand of the multi-module unit is a loading demand; if yes, execute S706; if no, execute S709.

[0151] Specifically, this step involves obtaining the current operating requirements of the multi-module unit when the rate of change of the inlet water temperature meets the first preset rate of change; the operating requirements include loading requirements or load reduction requirements.

[0152] S706, Control the first compressor in the first compressor module to increase its frequency.

[0153] Specifically, when the current operating demand of the multi-module unit is the loading demand, the first compressor in the first compressor module is controlled to increase its frequency.

[0154] S707 If the first compressor in the first compressor module does not meet the load requirements when it reaches the maximum frequency, then control the second compressor in the first compressor module to increase its frequency until the last compressor in the first compressor module reaches the maximum frequency.

[0155] S708. When the last compressor in the Nth compressor module is increased to the maximum frequency, the loading requirement is still not met. Then, the first compressor in the N+1th compressor module is controlled to increase its frequency until the last compressor in the last compressor module is increased to the maximum frequency. N is an integer greater than or equal to 1.

[0156] S709, Control the first compressor in the first compressor module to reduce its frequency.

[0157] Specifically, when the current operating demand of the multi-module unit is a load reduction demand, the first compressor in the first compressor module is controlled to reduce its frequency.

[0158] S710 If the first compressor in the first compressor module does not meet the load reduction requirement when its frequency is reduced to the minimum frequency, then the second compressor in the first compressor module is controlled to reduce its frequency until the last compressor in the first compressor module reduces its frequency to the minimum frequency.

[0159] S711. When the last compressor in the Nth compressor module reduces its frequency to the minimum frequency, it still does not meet the load reduction requirement. Then, the first compressor in the N+1th compressor module is controlled to reduce its frequency until the last compressor in the last compressor module reduces its frequency to the minimum frequency. N is an integer greater than or equal to 1.

[0160] S712. If the rate of change of the inlet water temperature meets the second preset rate of change, determine whether the current operating demand of the multi-module unit is a loading demand; if yes, execute S713; if no, execute S714.

[0161] Specifically, this step involves obtaining the current operating requirements of the multi-module unit when the rate of change of the inlet water temperature meets the second preset rate of change; the operating requirements include loading requirements or load reduction requirements.

[0162] S713 controls all compressors in each compressor module to increase their frequency.

[0163] Specifically, when the current operating demand of the multi-module unit is the loading demand, control all compressors in each compressor module to increase their frequency.

[0164] S714 controls all compressors in each compressor module to reduce their frequency.

[0165] Specifically, when the current operating demand of the multi-module unit is a load reduction demand, control all compressors in each compressor module to reduce their frequency.

[0166] S715. If the load reduction requirement is still not met after all compressors in each compressor module have reduced their frequency to the minimum frequency, then shut down any one of the compressors.

[0167] S716. When the multi-module unit has a loading requirement, control the compressor that was shut down to start, and control all compressors to increase their frequency as a whole.

[0168] For example, if the preset value is 5℃ / hour, when the absolute value of the rate of change of the inlet water temperature is 3℃ / hour, the rate of change of the inlet water temperature meets the first preset rate of change, indicating that there is a buffer tank and the water temperature fluctuation in the total water circuit is small. At this time, the compressors in the multi-module unit can be individually frequency-increased or switched on / off. For example, the multi-module unit includes two compressor modules, and each compressor module includes two compressors. When there is a load demand, the first compressor in the first compressor module is controlled to start and its frequency is increased. When the frequency is increased to the maximum frequency, if the target demand is still not met, the second compressor in the first compressor module is controlled to start and its frequency is increased. If the target demand is still not met, the first compressor in the second compressor module is controlled to start and its frequency is increased. When the frequency is increased to the maximum frequency, if the target demand is still not met, the second compressor in the second compressor module is controlled to start and its frequency is increased. When there is a load reduction requirement, the first compressor in the first compressor module is controlled to reduce its frequency. If the target requirement is still not met when the frequency is reduced to the minimum frequency, the second compressor in the first compressor module is controlled to reduce its frequency. If the target requirement is still not met, the first compressor in the second compressor module is controlled to reduce its frequency. If the target requirement is still not met when the frequency is reduced to the minimum frequency, the second compressor in the second compressor module is controlled to reduce its frequency.

[0169] When the absolute value of the rate of change of the inlet water temperature is 7℃ / hour, the rate of change of the inlet water temperature meets the second preset rate of change, indicating that there is no buffer tank and the water temperature fluctuation in the main water circuit is large. At this time, the compressor can be controlled by using the method of overall frequency increase and decrease of the compressor and only shutting down at the lowest frequency. For example, when there is a load demand, all four compressors are controlled to run at the lowest frequency. If the target demand is not met, the overall compressor frequency is increased to make the current inlet water temperature reach the target demand. When there is a load reduction demand, the overall frequency of the four compressors is reduced to make the current inlet water temperature reach the target demand. If the load reduction demand is still not met after the four compressors are reduced to the minimum frequency, one of the compressors is controlled to be shut down to make the current inlet water temperature reach the target demand. When there is a load demand, the shut-down compressor is controlled to be turned on, and all compressors are controlled to increase the overall frequency to meet the load demand.

[0170] The compressor control method for multi-module units provided in this invention can reduce water temperature fluctuations during the start-up and shutdown of multi-module units, improve user comfort, and enable multi-module units to change application logic according to on-site conditions, making multi-module units more adaptable.

[0171] This invention also provides a compressor control device for a multi-module unit. This compressor control device can execute the compressor control method for a multi-module unit provided in any embodiment of this invention, and has the corresponding functional modules and beneficial effects of executing the method.

[0172] Figure 8 This is a schematic diagram of the structure of a compressor control device for a multi-module unit according to an embodiment of the present invention. (Refer to...) Figure 8 The compressor control device of the multi-module unit includes a detection module 10, a judgment module 20 and a control module 30;

[0173] The detection module 10 is used to monitor the inlet water temperature of the multi-module unit; the judgment module 20 is used to judge whether the rate of change of the inlet water temperature meets the preset rate of change; the preset rate of change is used to determine whether there is a buffer water tank in the multi-module unit; the control module 30 is used to control the compressor to run with preset control logic when the rate of change of the inlet water temperature meets the preset rate of change.

[0174] Optionally, based on the above embodiments, the determination module 20 is specifically used to determine that the rate of change of the inlet water temperature satisfies a first preset rate of change when the absolute value of the rate of change of the inlet water temperature is less than a preset value; and to determine that the rate of change of the inlet water temperature satisfies a second preset rate of change when the compressor is turned on or off a preset number of times and the compressor is turned on or off for a preset time each time.

[0175] Optionally, based on the above embodiments, the determining module 30 is specifically used to control the compressor to run with the first control logic when the rate of change of the inlet water temperature meets the first preset rate of change; and to control the compressor to run with the second control logic when the rate of change of the inlet water temperature meets the second preset rate of change.

[0176] Optionally, embodiments of the present invention also provide a compressor control system for a multi-module unit, including the compressor control device for the multi-module unit provided in the above embodiments. Therefore, the compressor control system for the multi-module unit also has the beneficial effects of any of the above embodiments.

[0177] Optionally, the multi-module unit includes multiple compressor modules, which are connected in series.

[0178] In this context, the online setup can be understood as connecting or configuring multiple compressor modules together in a certain way to work collaboratively, providing higher cooling or heating capacity, and achieving functions such as load balancing, energy-saving operation, and redundancy backup.

[0179] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0180] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A compressor control method for a multi-module unit, characterized in that, include: Monitor the inlet water temperature of the multi-module unit; Determine whether the rate of change of the inlet water temperature meets the preset rate of change. The preset rate of change is used to determine whether a buffer water tank exists in the multi-module unit; When the rate of change of the inlet water temperature meets the preset rate of change, the compressor is controlled to operate using preset control logic; The preset rate of change includes: A first preset rate of change, the first preset rate of change is used to determine that there is a buffer water tank in the multi-module unit; The second preset rate of change is used to determine that there is no buffer water tank in the multi-module unit; When the rate of change of the inlet water temperature meets the preset rate of change, the compressor is controlled to operate using preset control logic, including: When the rate of change of the inlet water temperature meets the first preset rate of change, the compressor is controlled to operate using the first control logic; When the rate of change of the inlet water temperature meets the preset rate of change, the compressor is controlled to operate using preset control logic, further comprising: When the rate of change of the inlet water temperature meets the second preset rate of change, the compressor is controlled to operate using the second control logic.

2. The compressor control method for the modular unit according to claim 1, characterized in that, The step of determining whether the rate of change of the inlet water temperature meets the preset rate of change includes: When the absolute value of the rate of change of the inlet water temperature is less than a preset value, it is determined that the rate of change of the inlet water temperature satisfies the first preset rate of change.

3. The compressor control method for the modular unit according to claim 2, characterized in that, The multi-module unit includes multiple compressor modules, and each compressor module includes at least one compressor. When the rate of change of the inlet water temperature meets the first preset rate of change, controlling the compressor to operate using the first control logic includes: When the rate of change of the inlet water temperature meets the first preset rate of change, the current operating requirements of the multi-module unit are obtained; the operating requirements include loading requirements or unloading requirements. When the current operating demand of the multi-module unit is the loading demand, the compressors in each compressor module are controlled to start sequentially. When the current operating demand of the multi-module unit is the load reduction demand, the compressors in each compressor module are controlled to shut down sequentially.

4. The compressor control method for the modular unit according to claim 3, characterized in that, Each of the compressor modules includes multiple compressors; When the current operating demand of the multi-module unit is the loading demand, the compressors in each compressor module are controlled to start sequentially, including: When the current operating demand of the multi-module unit is the loading demand, the first compressor in the first compressor module is controlled to increase its frequency. If the first compressor in the first compressor module does not meet the loading requirements when it reaches the maximum frequency, then the second compressor in the first compressor module is controlled to increase its frequency until the last compressor in the first compressor module reaches the maximum frequency. If the loading requirement is still not met when the last compressor in the Nth compressor module reaches its maximum frequency, then the first compressor in the (N+1)th compressor module is controlled to increase its frequency until the last compressor in the last compressor module reaches its maximum frequency; N is an integer greater than or equal to 1. When the current operating demand of the multi-module unit is the load reduction demand, the compressors in each compressor module are controlled to shut down sequentially, including: When the current operating demand of the multi-module unit is the load reduction demand, the first compressor in the first compressor module is controlled to reduce its frequency. If the first compressor in the first compressor module does not meet the load reduction requirement when its frequency is reduced to the minimum frequency, then the second compressor in the first compressor module is controlled to reduce its frequency until the last compressor in the first compressor module reduces its frequency to the minimum frequency. If the load reduction requirement is still not met when the last compressor in the Nth compressor module is reduced to the minimum frequency, then the first compressor in the (N+1)th compressor module is controlled to reduce its frequency until the last compressor in the last compressor module is reduced to the minimum frequency; N is an integer greater than or equal to 1.

5. The compressor control method for the modular unit according to claim 1, characterized in that, The step of determining whether the rate of change of the inlet water temperature meets the preset rate of change includes: If the compressor is turned on or off a preset number of times, and the compressor is turned on or off for a preset time each time, and the absolute value of the rate of change of the inlet water temperature is greater than or equal to a preset value, then the rate of change of the inlet water temperature is determined to satisfy the second preset rate of change.

6. The compressor control method for the modular unit according to claim 5, characterized in that, The multi-module unit includes multiple compressor modules, and each compressor module includes at least one compressor. When the rate of change of the inlet water temperature meets the second preset rate of change, the compressor is controlled to operate using the second control logic, including: When the rate of change of the inlet water temperature meets the second preset rate of change, the current operating requirements of the multi-module unit are obtained; the operating requirements include loading requirements or unloading requirements. When the current operating demand of the multi-module unit is the loading demand, control all compressors in each compressor module to increase their frequency; When the current operating demand of the multi-module unit is the load reduction demand, all compressors in each compressor module are controlled to reduce their frequency.

7. The compressor control method for a modular unit according to claim 6, characterized in that, When the current operating demand of the multi-module unit is the loading demand, control all compressors in each compressor module to increase their frequency, including: When the current operating demand of the multi-module unit is the loading demand, all compressors in each compressor module are controlled to increase their frequency from the minimum frequency.

8. A compressor control device for a multi-module unit, characterized in that, include: The detection module is used to monitor the inlet water temperature of the multi-module unit; The judgment module is used to determine whether the rate of change of the inlet water temperature meets the preset rate of change; the preset rate of change is used to determine whether there is a buffer tank in the multi-module unit; wherein, the preset rate of change includes a first preset rate of change and a second preset rate of change, the first preset rate of change is used to determine that there is a buffer tank in the multi-module unit; the second preset rate of change is used to determine that there is no buffer tank in the multi-module unit. The control module is used to control the compressor to operate using preset control logic when the rate of change of the inlet water temperature meets the preset rate of change. Specifically, the control module is used for: When the rate of change of the inlet water temperature meets the first preset rate of change, the compressor is controlled to operate using the first control logic; When the rate of change of the inlet water temperature meets the second preset rate of change, the compressor is controlled to operate using the second control logic.

9. A compressor control system for a multi-module unit, characterized in that, The compressor control device for the multi-module unit as described in claim 8, wherein the multi-module unit includes multiple compressor modules and the multiple compressor modules are connected in series.

Images