Compressor control method, device and system for multi-module unit

Abstract

The invention discloses a compressor control method, device and system for a multi-module unit. The compressor control method of the multi-module unit comprises the steps that the water inlet temperature of the multi-module unit is monitored; whether the water temperature change rate of the water inlet temperature meets the preset change rate or not is judged; the preset change rate is used for determining whether a buffer water tank exists in the multi-module unit; and when the water temperature change rate of the water inlet temperature meets the preset change rate, the compressor is controlled to operate according to the preset control logic. According to the technical scheme, the user experience effect can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of multi-module units, and in particular to a compressor control method, device and system for a multi-module unit. Background Art

[0002] As people's requirements for the comfort of ambient temperature are getting higher and higher, multi-module units are widely used. During use, users are usually required to equip buffer water tanks to avoid large fluctuations in water temperature in the water system.

[0003] However, in actual applications, the modular unit will start or shut down the compressor according to the corresponding operating requirements, and the compressor startup and shutdown have a certain time limit. When the compressor startup or shutdown does not reach the preset time, it will not start or shut down. If there is no buffer water tank or the configured buffer water tank is small, the water temperature in the water system will continue to decrease or increase, resulting in large fluctuations in the water temperature of the water system, which will cause the unit to be unable to respond quickly to user needs and reduce the user experience. Summary of the invention

[0004] The present invention provides a compressor control method, device and system for a multi-module unit to enhance user experience.

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

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

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

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

[0009] Optionally, the preset change rate includes:

[0010] a first preset rate of change, the first preset rate of change being used to determine the presence of a buffer water tank in the multi-module unit;

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

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

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

[0014] When the water temperature change rate of the inlet water temperature meets the preset change rate, controlling the compressor to operate according to a preset control logic, including:

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

[0016] Optionally, the multi-module unit comprises a plurality of compressor modules, each of which comprises at least one compressor;

[0017] When the water temperature change rate of the inlet water temperature satisfies the first preset change rate, controlling the operation of the compressor with the first control logic includes:

[0018] When the water temperature change rate of the inlet water temperature meets the first preset change rate, obtaining the current operation demand of the multi-module unit; the operation demand includes a loading demand or a load reduction demand;

[0019] When the current operation requirement of the multi-module unit is the loading requirement, controlling the compressors in each of the compressor modules to start in sequence;

[0020] When the current operation requirement of the multi-module unit is the load reduction requirement, the compressors in each of the compressor modules are controlled to be turned off in sequence.

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

[0022] When the current operation demand of the multi-module unit is the loading demand, controlling the compressors in each of the compressor modules to start in sequence comprises:

[0023] When the current operation demand of the multi-module unit is a loading demand, controlling the first compressor in the first compressor module to increase the frequency;

[0024] If the loading requirement is not met when the first compressor in the first compressor module is frequency-upgraded to the maximum frequency, the second compressor in the first compressor module is controlled to frequency-upgrade until the last compressor in the first compressor module is frequency-upgraded to the maximum frequency;

[0025] When the last compressor in the Nth compressor module is frequency-upgraded to the maximum frequency, the loading requirement is still not met, then the first compressor in the N+1th compressor module is controlled to frequency-upgrade until the last compressor in the last compressor module is frequency-upgraded to the maximum frequency; N is an integer greater than or equal to 1;

[0026] When the current operation requirement of the multi-module unit is the load reduction requirement, controlling the compressors in each of the compressor modules to be turned off in sequence comprises:

[0027] When the current operation demand of the multi-module unit is a load reduction demand, controlling the first compressor in the first compressor module to reduce the frequency;

[0028] If the load reduction requirement is not met when the first compressor in the first compressor module is reduced in frequency to the minimum frequency, the second compressor in the first compressor module is controlled to reduce in frequency until the last compressor in the first compressor module is reduced in frequency to the minimum frequency;

[0029] When the last compressor in the Nth compressor module is reduced in frequency to the minimum frequency and the load reduction requirement is still not met, the first compressor in the N+1th compressor module is controlled to be reduced in frequency until the last compressor in the last compressor module is reduced in frequency to the minimum frequency; N is an integer greater than or equal to 1.

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

[0031] When the number of times the compressor is turned on or off reaches a preset number of times and the time for each compressor to be turned on or off reaches a preset time, if the absolute value of the water temperature change rate of the inlet water temperature is greater than or equal to the preset value, it is determined that the water temperature change rate of the inlet water temperature meets the second preset change rate;

[0032] When the water temperature change rate of the inlet water temperature meets the preset change rate, controlling the compressor to operate according to a preset control logic, including:

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

[0034] Optionally, the multi-module unit comprises a plurality of compressor modules, each of which comprises at least one compressor;

[0035] When the water temperature change rate of the inlet water temperature satisfies the second preset change rate, controlling the operation of the compressor with the second control logic includes:

[0036] When the water temperature change rate of the inlet water temperature meets the second preset change rate, obtaining the current operation demand of the multi-module unit; the operation demand includes a loading demand or a load reduction demand;

[0037] When the current operation requirement of the multi-module unit is the loading requirement, controlling all the compressors in each compressor module to increase the frequency;

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

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

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

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

[0042] A detection module, used for monitoring the water inlet temperature of the multi-module unit;

[0043] A judgment module, used to judge whether the water temperature change rate of the inlet water temperature meets a preset change rate; the preset change rate 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 operation of the compressor according to a preset control logic when the water temperature change rate of the inlet water temperature meets the preset change rate.

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

[0046] The technical solution of the embodiment of the present invention determines whether there is a buffer water tank in the multi-module unit by judging whether the water temperature change rate of the inlet water temperature meets the preset change rate, so as to adopt different control logics to control the operation of the compressor according to different situations, so that the multi-module unit can adapt to the on-site conditions, making the multi-module unit more adaptable and conducive to improving energy efficiency. Furthermore, by adaptively controlling the compressor to operate with different control logics through the multi-module unit, the load of the compressor can be more balanced, the service life of the compressor can be extended, and the maintenance cost of the equipment can be reduced. At the same time, this embodiment can control the operation of the compressor by adaptively selecting different control logics according to the actual situation, so that the water temperature fluctuation is small during the process of starting and stopping the compressor, thereby improving the user experience.

[0047] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

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

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

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

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

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

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

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

[0056] Figure 8 The present invention is a schematic structural diagram of a compressor control device for a multi-module unit provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0057] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work 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 and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0059] An embodiment of the present invention provides a compressor control method for a multi-module unit, which can determine different control logics to control the operation of the compressor according to whether a buffer water tank exists. The method can be executed by a compressor control device for the multi-module unit, which can be implemented in the form of hardware and / or software.

[0060] Figure 1 FIG. 1 is a flow chart of a compressor control method for a multi-module unit according to an embodiment of the present invention, referring to FIG. Figure 1 , the compressor control method of the multi-module unit includes:

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

[0062] Among them, the multi-module unit can be specifically understood as a device composed of multiple independent but mutually cooperating compressor modules, and multiple compressor modules work together to provide the required functions. For example, the multi-module unit can be used in an air-conditioning system, and each compressor module can be started and stopped independently as needed, providing flexible adjustment capabilities while ensuring the efficiency and reliability of the entire system. In addition, the air-conditioning system also includes a main water circuit, which connects each module unit. The main water circuit includes a water pump, a water inlet pipe, and a water outlet pipe. The water inlet pipe is used to transport the cold / hot water in the main water circuit to the inside of the multi-module unit. The multi-module unit adjusts the water temperature by cooling or heating water; the water outlet pipe is used to transport the cold / hot water processed by the multi-module unit back to the main water circuit to form 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 water 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 of the multi-module unit when it is running.

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

[0065] The water temperature change rate refers to the ratio of the difference in the change of the inlet water temperature within a certain time interval to the time interval. Whether the water temperature change rate meets the preset change rate can be understood as the relationship between the water temperature change rate and the preset value when the multi-module unit switches between the on and off states. For example, if the water temperature change rate is less than the preset value, it means that the water temperature change rate is small, and the current inlet water temperature fluctuation of the unit is small, so that it is determined that the water temperature change rate of the inlet water temperature meets the first preset change rate, which can be characterized as the presence of a buffer water tank in the unit. If the water temperature change rate is greater than or equal to the preset value, and after the compressor is turned on or off multiple times, the water temperature change rate is still greater than or equal to the preset value, then it indicates that the water temperature change rate is large, indicating that the current inlet water temperature fluctuation of the unit is large, so it can be determined that the water temperature change rate of the inlet water temperature meets the second preset change rate, which can be characterized as the absence of a buffer water tank in the unit.

[0066] The buffer water tank is used to balance and adjust the water temperature in the water circulation system, and plays a role in balancing the water temperature fluctuation. For example, the cold / hot water flow in the air-conditioning system may fluctuate due to changes in the indoor temperature regulation requirements, causing the multi-modular unit to switch between the on and off states. When there is a buffer water tank, more water can be stored, reducing the fluctuation of the water temperature in the system, thereby reducing the water temperature fluctuation in the total water circuit, ensuring the smooth operation of the multi-modular unit.

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

[0068] Among them, the preset control logic is to determine the control logic corresponding to the compressor according to whether there is a buffer water tank in the multi-module unit.

[0069] Specifically, the control logic of the compressor when there is a buffer water tank in the multi-module unit is different from the control logic of the compressor when there is no buffer water tank in the multi-module unit. For example, when it is determined that there is a buffer water tank, since the water temperature fluctuation in the total water circuit is small, the first control logic can be used to control the operation of the compressor, which is beneficial to saving power consumption. When it is determined that there is no buffer water tank, since the water temperature fluctuation in the total water circuit is large, if the first control logic is used to control the operation of the compressor, when there is a large demand for the indoor unit, the compressor may not be able to respond quickly to the demand of the indoor unit, resulting in large fluctuations in the water temperature of the water system, thereby reducing the user experience. Therefore, it is necessary to use a second control logic different from the first control logic to control the compressor in the unit to avoid the impact of water temperature fluctuations caused by the absence of a buffer water tank, thereby improving the user experience.

[0070] The technical solution of the embodiment of the present invention determines whether there is a buffer water tank in the multi-module unit by judging whether the water temperature change rate of the inlet water temperature meets the preset change rate, so as to adopt different control logics to control the operation of the compressor according to different situations, so that the multi-module unit can adapt to the on-site conditions, making the multi-module unit more adaptable and conducive to improving energy efficiency. Furthermore, by adaptively controlling the compressor to operate with different control logics through the multi-module unit, the load of the compressor can be more balanced, the service life of the compressor can be extended, and the maintenance cost of the equipment can be reduced. At the same time, this embodiment can control the operation of the compressor by adaptively selecting different control logics according to the actual situation, so that the water temperature fluctuation is small during the process of starting and stopping the compressor, thereby improving the user experience.

[0071] Based on the above embodiment, 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 whether there is a buffer water tank in the multi-module unit, and the second preset change rate is used to determine whether there is no buffer water tank in the multi-module unit.

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

[0073] Optionally, the second preset change rate determination process includes: when the number of times the compressor is turned on or off reaches a preset number of times and the time of each compressor being turned on or off reaches a preset time, if the absolute value of the water temperature change rate of the inlet water temperature is greater than or equal to a preset value, then determining that the water temperature change rate of the inlet water temperature meets the second preset change rate. Exemplarily, the preset number of times may be 3 times and the preset time may be 1 hour.

[0074] Figure 2 FIG. 1 is a flowchart of another compressor control method for a multi-module unit according to an embodiment of the present invention. Figure 2 Based on the above embodiment, the compressor control method of the multi-module unit includes:

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

[0076] S202, determine whether the absolute value of the water temperature change rate of the inlet water temperature is less than a preset value; if so, execute S203; if not, execute S204.

[0077] S203: Determine whether a water temperature change rate of the inlet water temperature satisfies a first preset change rate.

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

[0079] Specifically, when the absolute value of the water temperature change rate 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 water temperature change rate of the inlet water temperature is greater than or equal to the preset value, it indicates that the water temperature in the total water circuit changes significantly. In this case, 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, but the absolute value of the water temperature change rate of the water temperature 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: Control the operation of the compressor using the first control logic.

[0082] This step is specifically as follows: when the water temperature change rate of the inlet water temperature meets the first preset change rate, the compressor is controlled to operate according to the first control logic.

[0083] S206: Control the operation of the compressor using the second control logic.

[0084] This step is specifically as follows: when the water temperature change rate of the inlet water temperature meets the second preset change rate, the compressor is controlled to operate according to the second control logic.

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

[0086] The compressor control method of the multi-module unit provided in the embodiment of the present invention can enable the multi-module unit to adapt to the on-site conditions, thereby controlling the operation of the compressor with the corresponding control logic, thereby improving the adaptability of the multi-module unit.

[0087] Figure 3 FIG. 1 is a flowchart of another compressor control method for a multi-module unit according to an embodiment of the present invention. Figure 3 Based on the above embodiments, the multi-module unit includes a plurality of compressor modules, each compressor module includes at least one compressor; the compressor control method of the multi-module unit includes:

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

[0089] S302: When the absolute value of the water temperature change rate of the inlet water temperature is less than a preset value, determine that the water temperature change rate of the inlet water temperature satisfies a first preset change rate.

[0090] S303, determine whether the current operation demand of the multi-module unit is a loading demand; if so, execute S304; if not, execute S305.

[0091] This step is specifically as follows: when the water temperature change rate of the inlet water temperature meets the first preset change rate, the current operation demand of the multi-module unit is obtained; the operation demand includes a loading demand or a load reduction demand.

[0092] The current operation demand can be specifically understood as the load, temperature and other parameter requirements that the system needs to meet at a specific moment, and these requirements may be determined by various factors such as external environmental conditions, load fluctuations, customer needs, etc., and require each module in the system to be dynamically adjusted according to the requirements. In this embodiment, the current operation demand can be understood as the heating or cooling capacity in the current period.

[0093] Loading demand means that the system needs to increase load output to meet higher load demands or system performance requirements. For example, the target demand of the multi-module unit is 50°C. If the current inlet water temperature is 40°C, the compressor needs to be turned on to provide heating so that the current inlet water temperature reaches the target demand of 50°C. Load reduction demand means that the system needs to reduce load output to prevent system overload and ensure system stability and safety. For example, the target demand of the multi-module unit is 50°C. During the process of turning on the compressor, if the current inlet water temperature is 60°C, the compressor needs to be turned off to reduce heating so that the current inlet water temperature reaches the target demand of 50°C.

[0094] S304, controlling the compressors in each compressor module to start in sequence.

[0095] This step is specifically as follows: when the current operation demand of the multi-module unit is a loading demand, the compressors in each compressor module are controlled to start in sequence.

[0096] Specifically, when the current inlet water temperature of the multi-module unit is lower than the target demand, the compressor needs to be frequency-upgraded. Since the water temperature in the total water circuit fluctuates less, a smaller degree of frequency increase can meet the loading demand. That is, the compressors in each compressor module are controlled to start in sequence. When the water temperature in the total water circuit meets the demand after a certain compressor is turned on and frequency-up, the remaining compressors can be stopped; if the water temperature in the total water circuit still does not meet the demand after a certain compressor is turned on and frequency-up to the maximum frequency, the next compressor can be turned on until the water temperature in the total water circuit meets the demand.

[0097] S305, controlling the compressors in each compressor module to shut down in sequence.

[0098] This step is specifically as follows: when the current operation demand of the multi-module unit is a load reduction demand, the compressors in each compressor module are controlled to be shut down in sequence.

[0099] Specifically, when the current inlet water temperature of the multi-module unit is greater than the target demand, the compressor needs to be reduced in frequency. Since the water temperature in the total water circuit fluctuates less, a smaller degree of frequency reduction can meet the load reduction demand. That is, the compressors in each compressor module are controlled to be shut down in sequence. When the water temperature in the total water circuit meets the demand after shutting down a certain compressor and reducing the frequency, the remaining compressors can be stopped; if the water temperature in the total water circuit still does not meet the demand after shutting down a certain compressor and reducing the frequency to the minimum frequency, the next compressor can be shut down until the water temperature in the total water circuit meets the demand.

[0100] The compressor control method of the multi-module unit provided in an embodiment of the present invention is specifically a flow chart when the multi-module unit runs the first control logic according to the first preset change rate, which can reduce the water temperature fluctuation of the multi-module unit in the start-stop state and improve user comfort.

[0101] In this embodiment, each compressor module includes at least one compressor. For example, each compressor module includes multiple compressors. Figure 4 FIG. 1 is a flowchart of another compressor control method for a multi-module unit according to an embodiment of the present invention. Figure 4 Based on the above embodiments, the compressor control method of the multi-module unit provided in this embodiment includes:

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

[0103] S402: When the absolute value of the water temperature change rate of the inlet water temperature is less than a preset value, determine that the water temperature change rate of the inlet water temperature satisfies a first preset change rate.

[0104] S403, determine whether the current operation demand of the multi-module unit is a loading demand; if so, execute S404; if not, execute S407.

[0105] This step is specifically as follows: when the water temperature change rate of the inlet water temperature meets the first preset change rate, the current operation demand of the multi-module unit is obtained; the operation demand includes a loading demand or a load reduction demand.

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

[0107] This step is specifically as follows: when the current operation demand of the multi-module unit is a loading demand, the first compressor in the first compressor module is controlled to increase the frequency.

[0108] S405: If the loading requirement is not met when the first compressor in the first compressor module is frequency-increased to the maximum frequency, the second compressor in the first compressor module is controlled to frequency-increase until the last compressor in the first compressor module is frequency-increased to the maximum frequency.

[0109] S406. When the last compressor in the Nth compressor module is upgraded to the maximum frequency and the loading requirement is still not met, the first compressor in the N+1th compressor module is controlled to be upgraded until the last compressor in the last compressor module is upgraded to the maximum frequency; N is an integer greater than or equal to 1.

[0110] Specifically, since the water temperature fluctuation in the total water circuit is small, the operation demand of the indoor unit is also small, and the frequency of each compressor in the multi-module unit can be increased or decreased or the compressor can be switched on and off in batches. For example, the multi-module unit includes 3 compressor modules, and each compressor module includes 2 compressors. When there is a loading demand, the first compressor in the first compressor module is first controlled to start and increase the frequency. When it is increased to the maximum frequency, it still does not meet the target demand. The second compressor in the first compressor module is continued to be controlled to start and increase the frequency. When it is increased to the maximum frequency, it still does not meet the target demand. The first compressor in the second compressor module is controlled to start and increase the frequency. When it is increased to the maximum frequency, it still does not meet the target demand. The second compressor in the second compressor module is continued to be controlled to start and increase the frequency. When it is increased to the maximum frequency, it still does not meet the target demand. The first compressor in the third compressor module is controlled to start and increase the frequency. When it is increased to the maximum frequency, it still does not meet the target demand. The second compressor in the third compressor module is continued to be controlled to start.

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

[0112] This step is specifically as follows: when the current operation demand of the multi-module unit is a load reduction demand, the first compressor in the first compressor module is controlled to reduce the frequency.

[0113] S408: If the load reduction requirement is not met when the first compressor in the first compressor module is reduced in frequency to the minimum frequency, the second compressor in the first compressor module is controlled to reduce in frequency until the last compressor in the first compressor module is reduced in frequency to the minimum frequency.

[0114] S409. When the last compressor in the Nth compressor module is reduced in frequency to the minimum frequency and the load reduction requirement is still not met, the first compressor in the N+1th compressor module is controlled to reduce in frequency until the last compressor in the last compressor module is reduced in frequency to the minimum frequency; N is an integer greater than or equal to 1.

[0115] Exemplarily, the multi-module unit includes 3 compressor modules, each of which includes 2 compressors. When there is a load reduction demand, the first compressor in the first compressor module is first controlled to reduce the frequency. When the frequency is reduced to the minimum frequency, the target demand is still not met. The second compressor in the first compressor module is continued to be controlled to reduce the frequency. When the frequency is reduced to the minimum frequency, the target demand is still not met. The first compressor in the second compressor module is controlled to reduce the frequency. When the frequency is reduced to the minimum frequency, the target demand is still not met. The second compressor in the second compressor module is continued to be controlled to reduce the frequency. When the frequency is reduced to the minimum frequency, the target demand is still not met. The first compressor in the third compressor module is controlled to reduce the frequency. When the frequency is reduced to the minimum frequency, the target demand is still not met. The second compressor in the third compressor module is continued to be controlled to reduce the frequency.

[0116] Figure 5 FIG. 1 is a flowchart of another compressor control method for a multi-module unit according to an embodiment of the present invention. Figure 5 Based on the above embodiments, the multi-module unit includes a plurality of compressor modules, each compressor module includes at least one compressor; the compressor control method of the multi-module unit includes:

[0117] S501. Monitor the water inlet temperature of the multi-module unit.

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

[0119] S503, determine whether the current operation demand of the multi-module unit is a loading demand; if so, execute S504; if not, execute S505.

[0120] This step is specifically as follows: when the water temperature change rate of the inlet water temperature meets the second preset change rate, the current operation demand of the multi-module unit is obtained; the operation demand includes a loading demand or a load reduction demand.

[0121] S504, control all compressors in each compressor module to increase the frequency.

[0122] This step is specifically as follows: when the current operation demand of the multi-module unit is a loading demand, all the compressors in each compressor module are controlled to increase the frequency.

[0123] Specifically, when the current water inlet temperature of the multi-module machine is lower than the target demand, each compressor module is first controlled to start and increase the frequency.

[0124] Specifically, since the water temperature in the total water circuit fluctuates greatly, the operation demand of the indoor unit is also large, and the frequency of each compressor in the multi-module unit can be increased or decreased as a whole. For example, the multi-module unit includes 3 compressor modules, and each compressor module includes 2 compressors. When there is a loading demand, all 6 compressors are controlled to be turned on and run at the lowest frequency. If the target demand is not met, the overall compressor is controlled to increase the frequency so that the current inlet water temperature reaches the target demand.

[0125] Optionally, when the current operation demand of the multi-module unit is a loading demand, all compressors in each compressor module are controlled to increase the frequency, including:

[0126] When the current operation demand of the multi-module unit is a loading demand, all the compressors in each compressor module are controlled to increase the frequency from the minimum frequency.

[0127] S505, controlling all compressors in each compressor module to reduce the frequency.

[0128] This step is specifically as follows: when the current operation demand of the multi-module unit is a load reduction demand, all compressors in each compressor module are controlled to reduce the frequency.

[0129] Specifically, the compressor frequency can be reduced by using the method of overall frequency increase and decrease of the compressor. For example, the multi-module unit includes 3 compressor modules, each compressor module includes 2 compressors, and when there is a load reduction demand, the 6 compressors are controlled to reduce the frequency as a whole so that the current inlet water temperature reaches the target demand.

[0130] Figure 6 FIG. 1 is a flowchart of another compressor control method for a multi-module unit according to an embodiment of the present invention. Figure 6 Based on the above embodiments, each compressor module includes multiple compressors; the compressor control method of the multi-module unit includes:

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

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

[0133] S603, determine whether the current operation demand of the multi-module unit is a loading demand; if so, execute S604; if not, execute S605.

[0134] This step is specifically as follows: when the water temperature change rate of the inlet water temperature meets the second preset change rate, the current operation demand of the multi-module unit is obtained; the operation demand includes a loading demand or a load reduction demand.

[0135] S604, control all compressors in each compressor module to increase the frequency.

[0136] This step is specifically as follows: when the current operation demand of the multi-module unit is a loading demand, all the compressors in each compressor module are controlled to increase the frequency.

[0137] S605: Control all compressors in each compressor module to reduce the frequency.

[0138] This step is specifically as follows: when the current operation demand of the multi-module unit is a load reduction demand, all compressors in each compressor module are controlled to reduce the frequency.

[0139] S606: When all the compressors in each compressor module are reduced to the minimum frequency, if the load reduction requirement is still not met, shut down any one of the compressors.

[0140] S607, until the multi-module unit has a loading demand, control the closed compressor to turn on, and control all compressors to increase the frequency as a whole.

[0141] Exemplarily, the compressor frequency can be reduced by overall frequency reduction of the compressor and the method of shutting down only at the lowest frequency. Exemplarily, the multi-module unit includes 3 compressor modules, each compressor module includes 2 compressors. When there is a load reduction demand, the 6 compressors are controlled to reduce the frequency as a whole. When the 6 compressors are reduced to the minimum frequency and still do not meet the load reduction demand, any one of the compressors is controlled to be shut down so that the current inlet water temperature reaches the target demand. After waiting for a loading demand, the closed compressor is controlled to be turned on, and all compressors are controlled to increase the frequency as a whole to meet the loading demand.

[0142] In another embodiment, when all the compressors in each compressor module are reduced in frequency to the minimum frequency, if the load reduction demand is still not met, any one of the compressors will be turned off until the multi-module unit has a loading demand, and then all the compressors that are turned on can be increased in frequency. If the loading demand is still not met after all the compressors are increased in frequency to the maximum frequency, the closed compressors are controlled to be turned on and increased in frequency from the lowest frequency to meet the loading demand.

[0143] The compressor control method of the multi-module unit provided in an embodiment of the present invention is specifically a flow chart when the multi-module unit runs the second control logic according to the second preset change rate, which can reduce the water temperature fluctuation of the multi-module unit in the start-stop state and improve user comfort.

[0144] Figure 7FIG. 1 is a flowchart of another compressor control method for a multi-module unit according to an embodiment of the present invention. Figure 7 Based on the above embodiments, the compressor control method of the multi-module unit includes:

[0145] S701. Monitor the water inlet temperature of the multi-module unit.

[0146] S702, determine whether the absolute value of the water temperature change rate of the inlet water temperature is less than a preset value; if so, execute S703; if not, execute S704.

[0147] S703: Determine whether a water temperature change rate of the inlet water temperature satisfies a first preset change rate.

[0148] This step is specifically as follows: when the absolute value of the water temperature change rate of the inlet water temperature is less than a preset value, determining that the water temperature change rate of the inlet water temperature satisfies a first preset change rate.

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

[0150] S705. When the water temperature change rate of the inlet water temperature satisfies the first preset change rate, determine whether the current operation demand of the multi-module unit is a loading demand; if so, execute S706; if not, execute S709.

[0151] This step is specifically as follows: when the water temperature change rate of the inlet water temperature meets the first preset change rate, the current operation demand of the multi-module unit is obtained; the operation demand includes a loading demand or a load reduction demand.

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

[0153] This step is specifically as follows: when the current operation demand of the multi-module unit is a loading demand, the first compressor in the first compressor module is controlled to increase the frequency.

[0154] S707: If the loading requirement is not met when the first compressor in the first compressor module is frequency-increased to the maximum frequency, the second compressor in the first compressor module is controlled to frequency-increase until the last compressor in the first compressor module is frequency-increased to the maximum frequency.

[0155] S708. When the last compressor in the Nth compressor module is upgraded to the maximum frequency and the loading requirement is still not met, the first compressor in the N+1th compressor module is controlled to be upgraded until the last compressor in the last compressor module is upgraded 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 the frequency.

[0157] This step is specifically as follows: when the current operation demand of the multi-module unit is a load reduction demand, the first compressor in the first compressor module is controlled to reduce the frequency.

[0158] S710: If the load reduction requirement is not met when the first compressor in the first compressor module is reduced in frequency to the minimum frequency, the second compressor in the first compressor module is controlled to reduce in frequency until the last compressor in the first compressor module is reduced in frequency to the minimum frequency.

[0159] S711. When the last compressor in the Nth compressor module is reduced in frequency to the minimum frequency and the load reduction requirement is still not met, the first compressor in the N+1th compressor module is controlled to reduce in frequency until the last compressor in the last compressor module is reduced in frequency to the minimum frequency; N is an integer greater than or equal to 1.

[0160] S712. When the water temperature change rate of the inlet water temperature satisfies the second preset change rate, determine whether the current operation demand of the multi-module unit is a loading demand; if so, execute S713; if not, execute S714.

[0161] This step is specifically as follows: when the water temperature change rate of the inlet water temperature meets the second preset change rate, the current operation demand of the multi-module unit is obtained; the operation demand includes a loading demand or a load reduction demand.

[0162] S713, control all compressors in each compressor module to increase the frequency.

[0163] This step is specifically as follows: when the current operation demand of the multi-module unit is a loading demand, all the compressors in each compressor module are controlled to increase the frequency.

[0164] S714: Control all compressors in each compressor module to reduce the frequency.

[0165] This step is specifically as follows: when the current operation demand of the multi-module unit is a load reduction demand, all compressors in each compressor module are controlled to reduce the frequency.

[0166] S715. When all the compressors in each compressor module are reduced to the minimum frequency, if the load reduction requirement is still not met, shut down any one of the compressors.

[0167] S716. When the multi-module unit has a loading demand, the closed compressors are controlled to be turned on, and all compressors are controlled to increase the frequency as a whole.

[0168] For example, if the preset value is 5°C / hour, when the absolute value of the water temperature change rate of the inlet water temperature is 3°C / hour, the water temperature change rate of the inlet water temperature meets the first preset change rate, indicating that there is a buffer water tank, and the water temperature fluctuation in the total water circuit is small. At this time, the frequency of each compressor in the multi-module unit can be increased or decreased or the compressor can be switched on and off. For example, the multi-module unit includes 2 compressor modules, and each compressor module includes 2 compressors. When there is a loading demand, the first compressor in the first compressor module is controlled to start and increase the frequency. When the frequency is increased to the maximum frequency, if the target demand is still not met, the two compressors in the first compressor module are controlled to start and increase the frequency. If the target demand is still not met, the first compressor in the second compressor module is controlled to start and increase the frequency. When the frequency is increased to the maximum frequency, the target demand is still not met, and the two compressors in the second compressor module are controlled to start and increase the frequency. When there is a demand for load reduction, the first compressor in the first compressor module is controlled to reduce the frequency. When the frequency is reduced to the minimum frequency, if the target demand is still not met, the two compressors in the first compressor module are controlled to reduce the frequency. If the target demand is still not met, the first compressor in the second compressor module is controlled to reduce the frequency. When the frequency is reduced to the minimum frequency, if the target demand is still not met, the two compressors in the second compressor module are controlled to reduce the frequency.

[0169] When the absolute value of the water temperature change rate of the inlet water temperature is 7°C / hour, the water temperature change rate of the inlet water temperature meets the second preset change rate, indicating that there is no buffer water tank, and the water temperature in the total water circuit fluctuates greatly. At this time, the compressor can be controlled by increasing or decreasing the frequency of the compressor as a whole and starting to shut down at the lowest frequency. For example, when there is a loading demand, all four compressors are controlled to start running at the lowest frequency. If the target demand is not met, the overall compressor is controlled to increase the frequency so that the current inlet water temperature reaches the target demand. When there is a load reduction demand, the four compressors are controlled to reduce the frequency as a whole so that the current inlet water temperature reaches the target demand. When the four compressors are reduced to the minimum frequency and still do not meet the load reduction demand, any one of the compressors is controlled to be turned off so that the current inlet water temperature reaches the target demand. After waiting for a loading demand, the closed compressor is controlled to start, and all compressors are controlled to increase the frequency as a whole to meet the loading demand.

[0170] The compressor control method of the multi-module unit provided in the embodiment of the present invention can reduce the water temperature fluctuation of the multi-module unit in the start-stop state, improve user comfort, and enable the multi-module unit to change the application logic according to the on-site conditions, making the multi-module unit more adaptable.

[0171] An embodiment of the present invention also provides a compressor control device for a multi-module unit, which can execute the compressor control method for a multi-module unit provided by any embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method.

[0172] Figure 8 FIG. 1 is a schematic diagram of a compressor control device for a multi-module unit according to an embodiment of the present invention, with reference to FIG. 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 water temperature change rate of the inlet water temperature meets the preset change rate; the preset change rate 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 operation of the compressor with a preset control logic when the water temperature change rate of the inlet water temperature meets the preset change rate.

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

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

[0176] Optionally, an embodiment of the present invention further provides a compressor control system for a multi-module unit, including the compressor control device for the multi-module unit provided by the above embodiment. Therefore, the compressor control system of 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, and the multiple compressor modules are arranged online.

[0178] Among them, the online setting can be specifically understood as connecting or configuring multiple compressor modules together in some way to work together to provide higher cooling or heating capacity and achieve functions such as load balancing, energy-saving operation, and redundant backup.

[0179] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0180] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A compressor control method for a multi-module unit, characterized in that: include: monitoring the water inlet temperature of the multi-module unit; Determine whether the water temperature change rate of the inlet water temperature meets a preset change rate; The preset change rate is used to determine whether there is a buffer water tank in the multi-module unit; When the water temperature change rate of the inlet water temperature meets the preset change rate, the compressor is controlled to operate according to a preset control logic.

2. The compressor control method of a modular unit according to claim 1, characterized in that: The preset change rate includes: a first preset rate of change, the first preset rate of change being used to determine the presence of a buffer water tank in the multi-module unit; A second preset change rate, wherein the second preset change rate is used to determine that there is no buffer water tank in the multi-module unit.

3. The compressor control method of a modular unit according to claim 2, characterized in that: The step of determining whether the water temperature change rate of the inlet water temperature meets a preset change rate includes: When the absolute value of the water temperature change rate of the inlet water temperature is less than a preset value, determining that the water temperature change rate of the inlet water temperature satisfies the first preset change rate; When the water temperature change rate of the inlet water temperature meets the preset change rate, controlling the compressor to operate according to a preset control logic, including: When the water temperature change rate of the inlet water temperature meets the first preset change rate, the compressor is controlled to operate according to the first control logic.

4. The compressor control method of a modular unit according to claim 3, characterized in that: The multi-module unit comprises a plurality of compressor modules, each of which comprises at least one compressor; When the water temperature change rate of the inlet water temperature satisfies the first preset change rate, controlling the operation of the compressor with the first control logic includes: When the water temperature change rate of the inlet water temperature meets the first preset change rate, obtaining the current operation demand of the multi-module unit; the operation demand includes a loading demand or a load reduction demand; When the current operation requirement of the multi-module unit is the loading requirement, controlling the compressors in each of the compressor modules to start in sequence; When the current operation requirement of the multi-module unit is the load reduction requirement, the compressors in each of the compressor modules are controlled to be turned off in sequence.

5. The compressor control method of a modular unit according to claim 4, characterized in that: Each of the compressor modules includes a plurality of compressors; When the current operation demand of the multi-module unit is the loading demand, controlling the compressors in each of the compressor modules to start in sequence comprises: When the current operation demand of the multi-module unit is a loading demand, controlling the first compressor in the first compressor module to increase the frequency; If the loading requirement is not met when the first compressor in the first compressor module is frequency-upgraded to the maximum frequency, the second compressor in the first compressor module is controlled to frequency-upgrade until the last compressor in the first compressor module is frequency-upgraded to the maximum frequency; When the last compressor in the Nth compressor module is frequency-upgraded to the maximum frequency, the loading requirement is still not met, then the first compressor in the N+1th compressor module is controlled to frequency-upgrade until the last compressor in the last compressor module is frequency-upgraded to the maximum frequency; N is an integer greater than or equal to 1; When the current operation requirement of the multi-module unit is the load reduction requirement, controlling the compressors in each of the compressor modules to be turned off in sequence comprises: When the current operation requirement of the multi-module unit is the load reduction requirement, controlling the first compressor in the first compressor module to reduce the frequency; If the load reduction requirement is not met when the first compressor in the first compressor module is reduced in frequency to the minimum frequency, the second compressor in the first compressor module is controlled to reduce in frequency until the last compressor in the first compressor module is reduced in frequency to the minimum frequency; When the last compressor in the Nth compressor module is reduced in frequency to the minimum frequency and the load reduction requirement is still not met, the first compressor in the N+1th compressor module is controlled to be reduced in frequency until the last compressor in the last compressor module is reduced in frequency to the minimum frequency; N is an integer greater than or equal to 1.

6. The compressor control method of a modular unit according to claim 2, characterized in that: The step of determining whether the water temperature change rate of the inlet water temperature meets a preset change rate includes: When the number of times the compressor is turned on or off reaches a preset number of times and the time for each compressor to be turned on or off reaches a preset time, if the absolute value of the water temperature change rate of the inlet water temperature is greater than or equal to a preset value, it is determined that the water temperature change rate of the inlet water temperature meets the second preset change rate; When the water temperature change rate of the inlet water temperature meets the preset change rate, controlling the compressor to operate according to a preset control logic, including: When the water temperature change rate of the inlet water temperature meets the second preset change rate, the compressor is controlled to operate according to a second control logic.

7. The compressor control method of a modular unit according to claim 6, characterized in that: The multi-module unit comprises a plurality of compressor modules, each of which comprises at least one compressor; When the water temperature change rate of the inlet water temperature satisfies the second preset change rate, controlling the operation of the compressor with the second control logic includes: When the water temperature change rate of the inlet water temperature meets the second preset change rate, obtaining the current operation demand of the multi-module unit; the operation demand includes a loading demand or a load reduction demand; When the current operation requirement of the multi-module unit is the loading requirement, controlling all the compressors in each compressor module to increase the frequency; When the current operation requirement of the multi-module unit is the load reduction requirement, all the compressors in each of the compressor modules are controlled to reduce the frequency.

8. The compressor control method of a modular unit according to claim 7, characterized in that: When the current operation requirement of the multi-module unit is the loading requirement, controlling all the compressors in each of the compressor modules to increase the frequency includes: When the current operation requirement of the multi-module unit is the loading requirement, all the compressors in each of the compressor modules are controlled to increase the frequency from the minimum frequency.

9. A compressor control device for a multi-module unit, characterized in that: include: A detection module, used for monitoring the water inlet temperature of the multi-module unit; A judgment module, used to judge whether the water temperature change rate of the inlet water temperature meets a preset change rate; the preset change rate is used to determine whether there is a buffer water tank in the multi-module unit; The control module is used to control the operation of the compressor according to a preset control logic when the water temperature change rate of the inlet water temperature meets the preset change rate.

10. A compressor control system for a multi-module unit, characterized in that: A compressor control device comprising the multi-module unit as claimed in claim 9, wherein the multi-module unit comprises a plurality of compressor modules, and the plurality of compressor modules are arranged online.

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