Cold station system and heat pump grouping, control processing method, device, and electronic equipment thereof

Abstract

The present application relates to a cold station system and its heat pump grouping, control processing method, device, and electronic equipment, and belongs to the field of cold station control technology. The present application is for a preset number of load interval segments, and uses the hourly cold load rate of the cold station system to obtain the operating time proportion corresponding to each load rate segment, and then uses the operating time proportion corresponding to each load rate segment to determine the value of the machine addition conversion point parameter corresponding to the load rate segment; the maximum cold load rate in the load rate segment and the value of the machine addition conversion point parameter corresponding to the load rate segment are used to group the heat pumps included in the cold station system to obtain the heat pump grouping corresponding to the load rate segment, wherein the value of the machine addition conversion point parameter is used to adjust the number of heat pumps allocated to the heat pump grouping corresponding to the load rate segment, thereby realizing the grouping of the heat pumps included in the cold station system, which helps to ensure the rationality of the heat pump grouping.

Description

Technical Field

[0001] The present application belongs to the field of cold station control technology, and specifically relates to a cold station system and its heat pump grouping, control processing method, device, and electronic equipment. Background Art

[0002] The cold station system can realize centralized cooling. In a cold station system, there are multiple heat pumps. For each heat pump, if the parameters are precisely controlled for each heat pump, each heat pump needs to be equipped with an electric butterfly valve, which has a relatively large investment cost and adds many control points. Under the condition of ensuring the balance between supply and demand of the system's cooling capacity, each device needs to be independently controlled, and the control logic is more complicated and cumbersome. Summary of the invention

[0003] To this end, the present application provides a cold station system and its heat pump grouping, control processing method, device, and electronic equipment, which help solve the following problems: if the parameters of each heat pump under the cold station system are precisely controlled, each heat pump needs to be equipped with a corresponding electric butterfly valve, and many control points are added to the control. While ensuring the balance between supply and demand of the system's cooling capacity, each device is independently controlled, and the control logic becomes more complex and cumbersome.

[0004] To achieve the above objectives, this application adopts the following technical solutions:

[0005] In a first aspect, the present application provides a method for grouping heat pumps in a cold station system, the method comprising:

[0006] Obtain the hourly cooling load rate of the cooling station system;

[0007] For a preset number of load interval segments, the hourly cooling load rate of the cooling station system is used to obtain the operating time proportion corresponding to each load rate segment;

[0008] The value of the machine-adding conversion point parameter corresponding to the load rate segment is determined by the proportion of operating time corresponding to the load rate segment; the heat pumps included in the cold station system are grouped using the maximum cooling load rate in the load rate segment and the corresponding value of the machine-adding conversion point parameter to obtain the heat pump grouping corresponding to the load rate segment, wherein the value of the machine-adding conversion point parameter is used to adjust the number of heat pumps allocated to the heat pump grouping corresponding to the load rate segment.

[0009] Furthermore, obtaining the hourly cooling load rate of the cooling station system includes:

[0010] Obtain the annual distribution data of the building's hourly cooling load;

[0011] Based on the year-round distribution data of the building's hourly cooling load, the hourly cooling load rate of the cooling station system is obtained using the preset cooling condition conversion temperature and the defined load temperature of the system at full load; wherein, when the outdoor dry-bulb hourly temperature ≥ the cooling condition conversion temperature, the cooling of the cooling station system is turned on; when the outdoor dry-bulb hourly temperature < the cooling condition conversion temperature, the cooling of the cooling station system is stopped; and when the outdoor dry-bulb hourly temperature reaches the defined load temperature of the system at full load, the cooling station system is operated at full load.

[0012] Furthermore, the number of the load interval segments does not exceed four.

[0013] Furthermore, the operation time proportion corresponding to the load rate segment is used to determine the value of the additional machine conversion point parameter corresponding to the load rate segment; the heat pumps included in the cold station system are grouped using the maximum cooling load rate in the load rate segment and the corresponding value of the additional machine conversion point parameter to obtain the heat pump grouping corresponding to the load rate segment, including:

[0014] When the number of the load interval segments is three, for the first load interval segment, according to N1=N*K1 / α, the number of heat pumps in the heat pump group corresponding to the first load interval segment is obtained; for the second load interval segment, according to N2=N*K2 / α-N1, the number of heat pumps in the heat pump group corresponding to the second load interval segment is obtained; for the third load interval segment, according to N3=N-N1-N2, the number of heat pumps in the heat pump group corresponding to the third load interval segment is obtained;

[0015] The heat pumps included in the cooling station system are grouped according to the number of heat pumps in the heat pump group corresponding to each load interval segment;

[0016] Among them, N1 is the number of heat pumps in the heat pump group corresponding to the first load interval segment, N2 is the number of heat pumps in the heat pump group corresponding to the second load interval segment, N3 is the number of heat pumps in the heat pump group corresponding to the third load interval segment, the first load interval segment, the second load interval segment and the third load interval segment are distributed in a load rate from small to large, N is the total number of heat pumps in the cold station system, K1 is the maximum cooling load rate in the first load interval segment, K2 is the maximum cooling load rate in the second load interval segment, K3 is the maximum cooling load rate in the third load interval segment, α is a preset system addition point parameter, when the operating time proportion corresponding to the load interval segment is ≤ the time proportion threshold, α is a value greater than or equal to 1, when the operating time proportion corresponding to the load interval segment is > the time proportion threshold, α is a value less than 1.

[0017] In a second aspect, the present application provides a control processing method for a cold station system, the cold station system comprising a heat pump group obtained by using any of the methods described in the first aspect above, the control processing method for the cold station system comprising:

[0018] Perform frequency synchronization control on each heat pump in the heat pump group to obtain the current supply and return water temperature difference of the supply and return water main pipeline corresponding to the heat pump group;

[0019] The current supply and return water temperature difference is compared with the supply and return water temperature difference setting range. When the current supply and return water temperature difference exceeds the supply and return water temperature difference setting range, the frequency of the variable frequency water pump of the heat pump group is adjusted according to the comparison result, wherein one heat pump group corresponds to one variable frequency water pump.

[0020] Furthermore, the current supply and return water temperature difference is compared with the supply and return water temperature difference setting interval. When the current supply and return water temperature difference exceeds the supply and return water temperature difference setting interval, the frequency of the variable frequency water pumps in the heat pump group is adjusted according to the comparison result, including:

[0021] If the current supply and return water temperature difference is ≥ the upper limit of the supply and return water temperature difference setting range, the variable frequency water pumps of the heat pump group are increased in frequency until the current supply and return water temperature difference is within the supply and return water temperature difference setting range.

[0022] Furthermore, the control processing method of the cold station system also includes:

[0023] If the variable frequency water pump of the heat pump group has reached the maximum frequency and the current supply and return water temperature difference is ≥ the upper limit of the supply and return water temperature difference setting range, if an unactivated heat pump group is detected, an additional heat pump group is activated.

[0024] Furthermore, the current supply and return water temperature difference is compared with the supply and return water temperature difference setting interval. When the current supply and return water temperature difference exceeds the supply and return water temperature difference setting interval, the frequency of the variable frequency water pumps in the heat pump group is adjusted according to the comparison result, including:

[0025] If the current supply and return water temperature difference is ≤ the lower limit of the supply and return water temperature difference setting range, the variable frequency water pumps in the heat pump group will be reduced in frequency until the current supply and return water temperature difference is within the supply and return water temperature difference setting range.

[0026] Furthermore, the control processing method of the cold station system also includes:

[0027] If the variable frequency water pump of the heat pump group has reached the minimum frequency and the current supply and return water temperature difference is ≤ the lower limit of the supply and return water temperature difference setting range, if it is detected that two or more heat pump groups have been turned on, one heat pump group will be turned off.

[0028] Furthermore, the control processing method of the cold station system also includes:

[0029] If it is detected that only one group of heat pump groups is running, when it is detected that the load rate of the heat pump group is ≤ the preset load rate threshold and continues for a preset time, the running heat pumps in the heat pump group are reduced until the load rate of the heat pump group is greater than the preset load rate threshold.

[0030] In a third aspect, the present application provides a heat pump grouping processing device for a cold station system, wherein the heat pump grouping processing of the cold station system includes:

[0031] An acquisition module, used to obtain the hourly cooling load rate of the cooling station system;

[0032] The first obtaining module is used to obtain the operating time proportion corresponding to each load rate segment by using the hourly cooling load rate of the cooling station system for a preset number of load interval segments;

[0033] The second obtaining module is used to determine the value of the additional machine conversion point parameter corresponding to the load rate segment through the proportion of the operating time corresponding to the load rate segment; use the maximum cooling load rate in the load rate segment and the corresponding value of the additional machine conversion point parameter to group the heat pumps included in the cold station system to obtain the heat pump grouping corresponding to the load rate segment, wherein when the operating time proportion of the load rate segment is greater than the preset time proportion threshold, the number of heat pumps in the heat pump group corresponding to the corresponding load rate segment can be increased according to the determined value of the additional machine conversion point parameter.

[0034] In a fourth aspect, the present application provides a control processing device for a cold station system, the cold station system comprising a heat pump group obtained by using any of the methods described in the first aspect above, the control processing device for the cold station system comprising:

[0035] An acquisition module is used to perform frequency synchronization control on each heat pump in the heat pump group and obtain the current supply and return water temperature difference of the supply and return water main pipeline corresponding to the heat pump group;

[0036] The frequency modulation module is used to compare the current supply and return water temperature difference with the supply and return water temperature difference setting range. When the current supply and return water temperature difference exceeds the supply and return water temperature difference setting range, the frequency of the variable frequency water pump of the heat pump group is adjusted according to the comparison result, wherein one heat pump group corresponds to one variable frequency water pump.

[0037] In a fifth aspect, the present application provides an electronic device, including:

[0038] One or more memories on which executable programs are stored;

[0039] One or more processors, used to execute the executable program in the memory to implement the steps of the method described in any one of the first aspects above.

[0040] In a sixth aspect, the present application provides a cold station system, comprising:

[0041] A plurality of heat pumps, wherein the plurality of heat pumps are formed into a plurality of heat pump groups using the method described in any one of the first aspects above;

[0042] A plurality of variable frequency water pumps having the same number as the heat pump groups, wherein one variable frequency water pump is configured corresponding to one heat pump group;

[0043] A controller, used to execute the method as described in any one of the second aspects above.

[0044] This application adopts the above technical solution, which has at least the following beneficial effects:

[0045] The present application targets a preset number of load interval segments and uses the hourly cooling load rate of the cooling station system to obtain the operating time percentage corresponding to the load rate segment, and then uses the operating time percentage corresponding to the load rate segment to determine the value of the additional machine conversion point parameter corresponding to the load rate segment; uses the maximum cooling load rate in the load rate segment and the value of the additional machine conversion point parameter corresponding to the load rate segment to group the heat pumps included in the cooling station system to obtain the heat pump grouping corresponding to the load rate segment, wherein the value of the additional machine conversion point parameter is used to adjust the number of heat pumps allocated to the heat pump grouping corresponding to the load rate segment, thereby realizing the grouping of the heat pumps included in the cooling station system, helping to ensure the rationality of the heat pump grouping, helping to simplify the control logic of the cooling station system under the grouping control of the present application, reducing the installation of valves and pipelines, and reducing the initial investment cost of the system.

[0046] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0048] Figure 1 is a flow chart showing a method for grouping heat pumps in a cold station system according to an exemplary embodiment;

[0049] Figure 2 is a flow chart showing a control processing method of a cold station system according to an exemplary embodiment;

[0050] Figure 3 is a schematic diagram showing a heat pump grouping processing device of a cold station system according to an exemplary embodiment;

[0051] Figure 4 is a schematic diagram showing a control processing device of a cold station system according to an exemplary embodiment;

[0052] Figure 5 is a schematic block diagram of an electronic device according to an exemplary embodiment;

[0053] Figure 6 It is a schematic block diagram of a cold station system according to an exemplary embodiment. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other implementation methods obtained by ordinary technicians in the field without creative work belong to the scope of protection of the present application.

[0055] See also Figure 1 , Figure 1 1 is a flow chart showing a method for grouping heat pumps in a cold station system according to an exemplary embodiment. The method comprises the following steps:

[0056] Step S11, obtaining the hourly cooling load rate of the cooling station system;

[0057] Step S12: for a preset number of load interval segments, using the hourly cooling load rate of the cooling station system to obtain the operating time proportion corresponding to each load rate segment;

[0058] Step S13, determining the value of the machine-adding conversion point parameter corresponding to the load rate segment by the proportion of operating time corresponding to the load rate segment; using the maximum cooling load rate in the load rate segment and the corresponding value of the machine-adding conversion point parameter, grouping the heat pumps included in the cold station system to obtain the heat pump grouping corresponding to the load rate segment, wherein the value of the machine-adding conversion point parameter is used to adjust the number of heat pumps allocated to the heat pump grouping corresponding to the load rate segment.

[0059] Specifically, the present application uses the hourly cooling load rate of the cooling station system to obtain the operating time percentage corresponding to each load rate segment for a preset number of load interval segments. The larger the operating time percentage corresponding to the load rate segment, the higher the operating rate of the cooling station system corresponding to the load rate segment. The operating time percentage corresponding to the load rate segment is used to determine the value of the machine conversion point parameter corresponding to the load rate segment to adjust the number of heat pumps allocated to the heat pump group corresponding to the load rate segment, which helps to make the load rate segment with a large operating time percentage get more heat pumps. Considering the maximum cooling load rate in the load rate segment to allocate the number of heat pumps in the heat pump group can ensure the reliable operation of the corresponding load rate segment. Therefore, by comprehensively utilizing the maximum cooling load rate in the load rate segment and the corresponding value of the adding machine conversion point parameter, the heat pumps included in the cold station system are grouped, which helps to ensure that the number of heat pumps allocated to each heat pump group is reasonable, so that one heat pump group can be controlled to output chilled water uniformly through a variable frequency water pump. When the load rate of the cold station system increases, when entering the next load rate segment, the heat pump group corresponding to the load rate segment is opened, wherein the heat pump group opened corresponding to the previous load rate segment continues to remain opened, which helps to simplify the control logic of the cold station system under the group control of this application, reduce the installation of valves and pipelines, and reduce the initial investment cost of the system.

[0060] For step S11, in one embodiment, the hourly cooling load rate of the cooling station system of the present application can be obtained through historical cooling load rate data of the cooling station system.

[0061] In another embodiment, obtaining the hourly cooling load rate of the cooling station system includes:

[0062] Obtain the annual distribution data of the building's hourly cooling load;

[0063] Based on the year-round distribution data of the building's hourly cooling load, the hourly cooling load rate of the cooling station system is obtained using the preset cooling condition conversion temperature and the defined load temperature of the system at full load; wherein, when the outdoor dry-bulb hourly temperature ≥ the cooling condition conversion temperature, the cooling of the cooling station system is turned on; when the outdoor dry-bulb hourly temperature < the cooling condition conversion temperature, the cooling of the cooling station system is stopped; and when the outdoor dry-bulb hourly temperature reaches the defined load temperature of the system at full load, the cooling station system is operated at full load.

[0064] Specifically, the scheme can use the hourly building load simulation model in the relevant technology to simulate the hourly cooling load rate of the cooling station system through the annual distribution data of the hourly cooling load of the building. Among them, the annual distribution data of the hourly cooling load of the building can be obtained by obtaining the hourly meteorological parameters of the year where the cooling station system is located. Then, using the preset refrigeration condition conversion temperature and the defined load temperature of the system at full load, it is set in the building hourly load simulation model: when the outdoor dry bulb hourly temperature ≥ the refrigeration condition conversion temperature, the cooling of the cooling station system starts to run, when the outdoor dry bulb hourly temperature < the refrigeration condition conversion temperature, the cooling of the cooling station system stops running, and when the outdoor dry bulb hourly temperature reaches the defined load temperature of the system at full load, the cooling station system runs at full load. In this way, the hourly cooling load rate of the cooling station system is obtained.

[0065] For step S12, the operating time percentage is the percentage of the refrigeration operating time under one load interval segment to the total refrigeration operating time under all load interval segments. One load interval segment corresponds to a group of heat pump groups, and a preset number N of load interval segments corresponds to N groups of heat pump groups. Each heat pump in a heat pump group adjusts the water flow rate through a variable frequency water pump. The heat pump groups are in a parallel relationship. Through the heat pump grouping, it helps to simplify the control and reduce the hardware cost. At the same time, because the variable frequency water pumps are in a parallel relationship, the attenuation of the water pumps in parallel is considered, that is, the water pump flow after parallel connection is not the sum of the flow rates of each water pump, but is less than the sum of the flow rates of each water pump. The number of heat pump groups should not be too many, that is, the number of load interval segments should not be too many, and it should be reasonable. In one embodiment, the number of load interval segments does not exceed four.

[0066] In one embodiment, the load interval segmentation can be obtained in the following manner: divide a plurality of continuous temperature intervals according to the preset temperature difference within the interval (such as including but not limited to 2°C as the temperature difference within the interval), and use the hourly cooling load rate of the cold station system to obtain the load rate range corresponding to each temperature interval, the cumulative operating time of the cold station system under the load rate range, and the corresponding time proportion. Take every M continuous load rate ranges as a load interval segmentation, and take the sum of the time proportions corresponding to the M continuous load rate ranges as the operating time proportion corresponding to the corresponding load interval segmentation. The relevant diagram is shown in the following table. In the table below, every four continuous load rate ranges are taken as a load interval segmentation to obtain three load interval segments. The operating time proportion corresponding to each load rate range can be calculated through the cumulative number of hours corresponding to each load rate range.

[0067]

[0068] For step S13, the value of the machine-adding conversion point parameter corresponding to the load rate segment is determined by the proportion of operating time corresponding to the load rate segment; the heat pumps included in the cold station system are grouped using the maximum cooling load rate in the load rate segment and the corresponding value of the machine-adding conversion point parameter to obtain the heat pump grouping corresponding to the load rate segment, wherein the value of the machine-adding conversion point parameter is used to adjust the number of heat pumps allocated to the heat pump grouping corresponding to the load rate segment.

[0069] In one embodiment, taking two load rate segments as an example, α is a preset system machine conversion point parameter. When the operating time proportion corresponding to the load interval segment is ≤ the time proportion threshold, α is a value greater than or equal to 1. When the operating time proportion corresponding to the load interval segment is > the time proportion threshold, α is a value less than 1. The value α of the machine conversion point parameter corresponding to the load rate segment with an operating time proportion greater than 50% can be configured as 0.9. The number of heat pumps N1 obtained by the heat pump grouping corresponding to the load rate segment with an operating time proportion greater than 50% can be obtained by the formula N1=N*K1 / α, where N is the total number of heat pumps in the cold station system, and K1 is the maximum cold load rate in the first load interval segment. Then, the number of heat pumps allocated to the other group is N2=N-N1. Then, according to the number of heat pumps in the heat pump grouping corresponding to each load interval segment, the heat pumps included in the cold station system are grouped.

[0070] In one embodiment, taking three load rate segments as an example, when the number of the load interval segments is three, for the first load interval segment, according to N1=N*K1 / α, the number of heat pumps in the heat pump group corresponding to the first load interval segment is obtained; for the second load interval segment, according to N2=N*K2 / α-N1, the number of heat pumps in the heat pump group corresponding to the second load interval segment is obtained; for the third load interval segment, according to N3=N-N1-N2, the number of heat pumps in the heat pump group corresponding to the third load interval segment is obtained;

[0071] The heat pumps included in the cooling station system are grouped according to the number of heat pumps in the heat pump group corresponding to each load interval segment;

[0072] Among them, N1 is the number of heat pumps in the heat pump group corresponding to the first load interval segment, N2 is the number of heat pumps in the heat pump group corresponding to the second load interval segment, N3 is the number of heat pumps in the heat pump group corresponding to the third load interval segment, the first load interval segment, the second load interval segment and the third load interval segment are distributed in a load rate from small to large, N is the total number of heat pumps in the cold station system, K1 is the maximum cooling load rate in the first load interval segment, K2 is the maximum cooling load rate in the second load interval segment, K3 is the maximum cooling load rate in the third load interval segment, α is a preset system addition point parameter, when the operating time proportion corresponding to the load interval segment is ≤ the time proportion threshold, α is a value greater than or equal to 1, when the operating time proportion corresponding to the load interval segment is > the time proportion threshold, α is a value less than 1.

[0073] The following is a specific explanation using the above table examples.

[0074] Assuming that there are 15 heat pumps in the cold station system, according to the above table, the operating time proportion corresponding to the first load interval segment is 14.6, the operating time proportion corresponding to the second load interval segment is 57.1%, and the operating time proportion corresponding to the third load interval segment is 28.3%. By setting the time proportion threshold, when the operating time proportion of the load rate segment is greater than the time proportion threshold, the value of the additional machine conversion point parameter determined can increase the number of heat pumps in the heat pump group corresponding to the corresponding load rate segment, so that the corresponding heat pump unit includes more heat pumps under the condition of high time proportion. For the operating time proportion corresponding to each load interval segment shown in the above table, a time proportion threshold can be set to allow the heat pump group corresponding to the second load interval segment to get more heat pumps.

[0075] In the following, the time proportion threshold is set to 30%. When the operation time proportion corresponding to the load interval segment is greater than the time proportion threshold, α is set to 0.95.

[0076] Among them, the operation time corresponding to the first load interval segment accounts for 14.6%, which is less than 30%. The corresponding system addition conversion point parameter α is 1, and the maximum load rate corresponding to the first load interval segment is 25%. Therefore, the number of heat pumps in the heat pump group corresponding to the first load interval segment is calculated to be N1=15*25%*1=3.75, which is rounded to an integer of 4. The operation time corresponding to the second load interval segment accounts for 57.1%, which is greater than 30%. The corresponding system addition conversion point parameter α is 0.95, and the maximum load rate corresponding to the second load interval segment is 65%. The number of heat pumps in the heat pump group corresponding to the second load interval segment is N2=15*65% / 0.95-4=6.26, which is rounded to an integer of 6. The number of heat pumps in the heat pump group corresponding to the third load interval segment is N3=15-4-6=5. If the units in the third load interval segment are to be turned on, it means that all the heat pumps in the cold station system are turned on.

[0077] See also Figure 2 , Figure 2 The present invention is a flowchart of a control processing method of a cold station system according to an exemplary embodiment. The cold station system includes a heat pump group obtained by using the heat pump group processing method of the cold station system. The control processing method of the cold station system includes the following steps:

[0078] Step S21, performing the same frequency and same load control on each heat pump in the heat pump group, and obtaining the current supply and return water temperature difference of the supply and return water main pipeline corresponding to the heat pump group;

[0079] Step S22, compare the current supply and return water temperature difference with the supply and return water temperature difference setting interval. When the current supply and return water temperature difference exceeds the supply and return water temperature difference setting interval, adjust the frequency of the variable frequency water pumps in the heat pump group according to the comparison result, wherein one heat pump group corresponds to one variable frequency water pump.

[0080] In practical applications, variable frequency water pumps can be selected according to the water flow and system head required for the system cooling load borne by each heat pump group. In the control processing method of the cold station system of the present application, the matching heat pump unit can be turned on according to the load rate of the cold station system. Each heat pump in the heat pump group adopts the same frequency and load control. The output of each heat pump in the heat pump group is the same to ensure that the overall energy consumption of the heat pump group is small. The supply and return water temperature difference of the heat pump group is used. When the current supply and return water temperature difference exceeds the set range of the supply and return water temperature difference, the water pump output frequency is controlled by variable frequency speed regulation, so as to achieve the adaptation of the load fluctuation of the cold station system by adjusting the water flow by variable frequency during the operation of the cold station system.

[0081] In one embodiment, the current supply and return water temperature difference is compared with the supply and return water temperature difference setting interval. When the current supply and return water temperature difference exceeds the supply and return water temperature difference setting interval, the frequency of the variable frequency water pumps in the heat pump group is adjusted according to the comparison result, including:

[0082] If the current supply and return water temperature difference is ≥ the upper limit of the supply and return water temperature difference setting range, the variable frequency water pumps of the heat pump group are increased in frequency until the current supply and return water temperature difference is within the supply and return water temperature difference setting range.

[0083] Specifically, when the current supply and return water temperature difference is ≥ the upper limit of the supply and return water temperature difference setting interval, the heat pump group load fluctuation exceeds the upper limit of the setting interval range, and the frequency conversion water pump of the heat pump group is increased to increase the water flow rate, so that the supply and return water temperature difference returns to the supply and return water temperature difference setting interval, thereby achieving the adaptation of the cold station system load fluctuation by frequency conversion to adjust the water flow rate during the operation of the cold station system. Furthermore, the control processing method of the cold station system also includes:

[0084] If the variable frequency water pump of the heat pump group has reached the maximum frequency and the current supply and return water temperature difference is ≥ the upper limit of the supply and return water temperature difference setting range, if an unactivated heat pump group is detected, an additional heat pump group is activated.

[0085] Specifically, when the variable frequency water pump of the heat pump group has reached the maximum frequency and the current supply and return water temperature difference is ≥ the upper limit of the supply and return water temperature difference setting range, it indicates that it is no longer possible to adapt to the load fluctuation of the cold station system by continuing to increase the regulating water flow. In this case, if it is detected that there are unactivated heat pump groups, one more group of heat pump groups is added to enable the supply and return water temperature difference to return to the supply and return water temperature difference setting range.

[0086] In one embodiment, the current supply and return water temperature difference is compared with the supply and return water temperature difference setting interval. When the current supply and return water temperature difference exceeds the supply and return water temperature difference setting interval, the frequency of the variable frequency water pumps in the heat pump group is adjusted according to the comparison result, including:

[0087] If the current supply and return water temperature difference is ≤ the lower limit of the supply and return water temperature difference setting range, the variable frequency water pumps in the heat pump group will be reduced in frequency until the current supply and return water temperature difference is within the supply and return water temperature difference setting range.

[0088] Specifically, when the current supply and return water temperature difference is less than or equal to the lower limit of the supply and return water temperature difference setting interval, the load fluctuation of the heat pump group is lower than the lower limit of the setting interval, and the frequency conversion water pump of the heat pump group is reduced to reduce the water flow rate, so that the supply and return water temperature difference returns to the supply and return water temperature difference setting interval, thereby achieving the adaptation of the load fluctuation of the cold station system by frequency conversion to adjust the water flow rate during the operation of the cold station system. Furthermore, the control processing method of the cold station system also includes:

[0089] If the variable frequency water pump of the heat pump group has reached the minimum frequency and the current supply and return water temperature difference is ≤ the lower limit of the supply and return water temperature difference setting range, if it is detected that two or more heat pump groups have been turned on, one heat pump group will be turned off.

[0090] Specifically, when the variable frequency water pump of the heat pump group has reached the lowest frequency and the current supply and return water temperature difference is ≤ the lower limit of the supply and return water temperature difference setting range, it indicates that it is no longer possible to adapt to the load fluctuation of the cold station system by continuing to reduce the regulating water flow. In this case, if it is detected that two or more heat pump groups have been turned on, one group of heat pump groups is turned off to return the supply and return water temperature difference to the supply and return water temperature difference setting range.

[0091] In one embodiment, the control processing method of the cold station system further includes:

[0092] If it is detected that only one group of heat pump groups is running, when it is detected that the load rate of the heat pump group is ≤ the preset load rate threshold and continues for a preset time, the running heat pumps in the heat pump group are reduced until the load rate of the heat pump group is greater than the preset load rate threshold.

[0093] Specifically, for heat pump units with only one group in operation, when the heat pumps in the heat pump group adopt the same frequency control, the water flow of the system needs to meet the water flow requirements of the normal operation of the water pump and the refrigeration host at the same time, which will cause the cooling supply of the cold station to be greater than the terminal demand cooling load under some operating conditions. Due to the water flow limit, the water pump frequency cannot be reduced. Therefore, it is necessary to reduce the machine control of the refrigeration host in the group to reduce the system output. Among them, the preset load rate threshold can be set to but not limited to 50%.

[0094] See also Figure 3 , Figure 3 is a schematic diagram of a heat pump group processing device of a cold station system according to an exemplary embodiment, wherein the heat pump group processing device 3 of the cold station system comprises:

[0095] An acquisition module 31 is used to obtain the hourly cooling load rate of the cooling station system;

[0096] The first obtaining module 32 is used to obtain the operating time proportion corresponding to each load rate segment by using the hourly cooling load rate of the cooling station system for a preset number of load interval segments;

[0097] The second obtaining module 33 is used to determine the value of the machine-adding conversion point parameter corresponding to the load rate segment through the proportion of operating time corresponding to the load rate segment; the heat pumps included in the cold station system are grouped using the maximum cooling load rate in the load rate segment and the corresponding value of the machine-adding conversion point parameter to obtain the heat pump grouping corresponding to the load rate segment, wherein the value of the machine-adding conversion point parameter is used to adjust the number of heat pumps allocated to the heat pump grouping corresponding to the load rate segment.

[0098] Further, a module 31 is obtained, which is specifically used for:

[0099] Obtain the annual distribution data of the building's hourly cooling load;

[0100] Based on the year-round distribution data of the building's hourly cooling load, the hourly cooling load rate of the cooling station system is obtained using the preset cooling condition conversion temperature and the defined load temperature of the system at full load; wherein, when the outdoor dry-bulb hourly temperature ≥ the cooling condition conversion temperature, the cooling of the cooling station system is turned on; when the outdoor dry-bulb hourly temperature < the cooling condition conversion temperature, the cooling of the cooling station system is stopped; and when the outdoor dry-bulb hourly temperature reaches the defined load temperature of the system at full load, the cooling station system is operated at full load.

[0101] Furthermore, the number of the load interval segments does not exceed four.

[0102] Further, the second obtaining module 33 is specifically used for: when the number of the load interval segments is three, for the first load interval segment, according to N1=N*K1 / α, the number of heat pumps in the heat pump group corresponding to the first load interval segment is obtained; for the second load interval segment, according to N2=N*K2 / α-N1, the number of heat pumps in the heat pump group corresponding to the second load interval segment is obtained; for the third load interval segment, according to N3=N-N1-N2, the number of heat pumps in the heat pump group corresponding to the third load interval segment is obtained;

[0103] The heat pumps included in the cooling station system are grouped according to the number of heat pumps in the heat pump group corresponding to each load interval segment;

[0104] Among them, N1 is the number of heat pumps in the heat pump group corresponding to the first load interval segment, N2 is the number of heat pumps in the heat pump group corresponding to the second load interval segment, N3 is the number of heat pumps in the heat pump group corresponding to the third load interval segment, the first load interval segment, the second load interval segment and the third load interval segment are distributed in a load rate from small to large, N is the total number of heat pumps in the cold station system, K1 is the maximum cooling load rate in the first load interval segment, K2 is the maximum cooling load rate in the second load interval segment, K3 is the maximum cooling load rate in the third load interval segment, α is a preset system addition point parameter, when the operating time proportion corresponding to the load interval segment is ≤ the time proportion threshold, α is a value greater than or equal to 1, when the operating time proportion corresponding to the load interval segment is > the time proportion threshold, α is a value less than 1.

[0105] Regarding the heat pump grouping processing device 3 of the cold station system in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the above related method, and will not be elaborated here.

[0106] See also Figure 4 , Figure 4is a schematic diagram of a control processing device of a cold station system according to an exemplary embodiment, wherein the cold station system includes a heat pump group obtained by using the heat pump group processing method of the cold station system, and the control processing device 4 of the cold station system includes:

[0107] An acquisition module 41 is used to perform frequency synchronization control on each heat pump in the heat pump group and acquire the current supply and return water temperature difference of the supply and return water main pipeline corresponding to the heat pump group;

[0108] The frequency modulation module 42 is used to compare the current supply and return water temperature difference with the supply and return water temperature difference setting interval. When the current supply and return water temperature difference exceeds the supply and return water temperature difference setting interval, the frequency of the variable frequency water pump of the heat pump group is adjusted according to the comparison result, wherein one heat pump group corresponds to one variable frequency water pump.

[0109] Furthermore, the frequency modulation module 42 is specifically used for:

[0110] If the current supply and return water temperature difference is ≥ the upper limit of the supply and return water temperature difference setting range, the variable frequency water pumps of the heat pump group are increased in frequency until the current supply and return water temperature difference is within the supply and return water temperature difference setting range.

[0111] Furthermore, the control processing device 4 of the cold station system also includes:

[0112] The group adding module is used to add a group of heat pump groups if the variable frequency water pump of the heat pump group has reached the maximum frequency and the current supply and return water temperature difference is ≥ the upper limit value of the supply and return water temperature difference setting range. If an unactivated heat pump group is detected, an additional heat pump group will be activated.

[0113] Furthermore, the frequency modulation module 42 is specifically used for:

[0114] If the current supply and return water temperature difference is ≤ the lower limit of the supply and return water temperature difference setting range, the variable frequency water pumps in the heat pump group will be reduced in frequency until the current supply and return water temperature difference is within the supply and return water temperature difference setting range.

[0115] Furthermore, the control processing device 4 of the cold station system also includes:

[0116] The group reduction module is used to close one heat pump group if the variable frequency water pump of the heat pump group has reached the minimum frequency and the current supply and return water temperature difference is ≤ the lower limit of the supply and return water temperature difference setting range. If it is detected that two or more heat pump groups have been turned on, one heat pump group will be closed.

[0117] Furthermore, the control processing device 4 of the cold station system also includes:

[0118] The single-group operation reduction module is used to reduce the number of operating heat pumps in the heat pump group if it is detected that only one group of heat pumps is running, and when it is detected that the load rate of the heat pump group is ≤ the preset load rate threshold and continues for a preset time, until the load rate of the heat pump group is greater than the preset load rate threshold.

[0119] Regarding the control processing device 4 of the cold station system in the above embodiment, the specific manner in which each module performs operations has been described in detail in the above embodiment of the related method, and will not be elaborated here.

[0120] See also Figure 5 , Figure 5 is a block diagram of an electronic device according to an exemplary embodiment. The electronic device 5 includes:

[0121] One or more memories 51 on which executable programs are stored;

[0122] One or more processors 52 are used to execute the executable program in the memory 51 to implement the steps of the heat pump grouping processing method of the cold station system.

[0123] For the electronic device 5, its processor 52 executes the program in the memory 51, which is described in detail in the embodiments of the corresponding method and will not be elaborated here.

[0124] See also Figure 6 , Figure 6 is a block diagram of a cold station system according to an exemplary embodiment, the cold station system 6 includes:

[0125] A plurality of heat pumps 61, wherein the plurality of heat pumps 61 utilizes the heat pump grouping processing method of the cold station system 6 to form a plurality of heat pump groups 62;

[0126] A plurality of variable frequency water pumps 63 having the same number as the heat pump group 62, wherein one variable frequency water pump 63 is configured corresponding to one heat pump group 62;

[0127] The controller 64 is used to execute the steps of the control processing method of the cold station system 6 as described above.

[0128] Similarly, the cold station system 6 has been described in detail in the embodiments of the corresponding methods, and will not be described in detail here.

[0129] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0130] It should be noted that, in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" and "multiple" refers to at least two.

[0131] It should be understood that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intermediate element at the same time; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. In addition, the "connection" used here may include wireless connection; the wording "and / or" used includes any unit and all combinations of one or more associated listed items.

[0132] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0133] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, multiple steps or methods can be implemented by software or firmware stored in the memory 51 and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0134] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0135] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0136] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0137] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0138] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for grouping heat pumps in a cold station system, characterized in that: The method comprises: Obtain the hourly cooling load rate of the cooling station system; For a preset number of load interval segments, the hourly cooling load rate of the cooling station system is used to obtain the operating time proportion corresponding to each load rate segment; Determine the value of the machine-adding conversion point parameter corresponding to the load rate segment by the operating time proportion corresponding to the load rate segment; group the heat pumps included in the cold station system by using the maximum cooling load rate in the load rate segment and the corresponding value of the machine-adding conversion point parameter to obtain the heat pump group corresponding to the load rate segment, wherein the value of the machine-adding conversion point parameter is used to adjust the number of heat pumps allocated to the heat pump group corresponding to the load rate segment; The operation time proportion corresponding to the load rate segment is used to determine the value of the additional machine conversion point parameter corresponding to the load rate segment; the heat pumps included in the cold station system are grouped using the maximum cooling load rate in the load rate segment and the corresponding value of the additional machine conversion point parameter to obtain the heat pump grouping corresponding to the load rate segment, including: When the number of the load interval segments is three, for the first load interval segment, according to N1=N*K1 / α, the number of heat pumps in the heat pump group corresponding to the first load interval segment is obtained; for the second load interval segment, according to N2=N*K2 / α-N1, the number of heat pumps in the heat pump group corresponding to the second load interval segment is obtained; for the third load interval segment, according to N3=N-N1-N2, the number of heat pumps in the heat pump group corresponding to the third load interval segment is obtained; The heat pumps included in the cooling station system are grouped according to the number of heat pumps in the heat pump group corresponding to each load interval segment; Among them, N1 is the number of heat pumps in the heat pump group corresponding to the first load interval segment, N2 is the number of heat pumps in the heat pump group corresponding to the second load interval segment, N3 is the number of heat pumps in the heat pump group corresponding to the third load interval segment, the first load interval segment, the second load interval segment and the third load interval segment are distributed in a load rate from small to large, N is the total number of heat pumps in the cold station system, K1 is the maximum cooling load rate in the first load interval segment, K2 is the maximum cooling load rate in the second load interval segment, K3 is the maximum cooling load rate in the third load interval segment, α is a preset system addition point parameter, when the operating time proportion corresponding to the load interval segment is ≤ the time proportion threshold, α is a value greater than or equal to 1, when the operating time proportion corresponding to the load interval segment is > the time proportion threshold, α is a value less than 1.

2. The method according to claim 1, characterized in that: The step of obtaining the hourly cooling load rate of the cooling station system comprises: Obtain the annual distribution data of the building's hourly cooling load; Based on the year-round distribution data of the building's hourly cooling load, the hourly cooling load rate of the cooling station system is obtained using the preset cooling condition conversion temperature and the defined load temperature of the system at full load; wherein, when the outdoor dry-bulb hourly temperature ≥ the cooling condition conversion temperature, the cooling of the cooling station system is turned on; when the outdoor dry-bulb hourly temperature < the cooling condition conversion temperature, the cooling of the cooling station system is stopped; and when the outdoor dry-bulb hourly temperature reaches the defined load temperature of the system at full load, the cooling station system is operated at full load.

3. The method according to claim 1, characterized in that The number of the load interval segments does not exceed four.

4. A control processing method for a cold station system, characterized in that: The cold station system includes a heat pump group obtained by the method according to any one of claims 1 to 3, and the control processing method of the cold station system includes: Perform frequency synchronization control on each heat pump in the heat pump group to obtain the current supply and return water temperature difference of the supply and return water main pipeline corresponding to the heat pump group; The current supply and return water temperature difference is compared with the supply and return water temperature difference setting range. When the current supply and return water temperature difference exceeds the supply and return water temperature difference setting range, the frequency of the variable frequency water pump of the heat pump group is adjusted according to the comparison result, wherein one heat pump group corresponds to one variable frequency water pump.

5. The method according to claim 4, characterized in that The current supply and return water temperature difference is compared with the supply and return water temperature difference setting interval. When the current supply and return water temperature difference exceeds the supply and return water temperature difference setting interval, the frequency of the variable frequency water pumps in the heat pump group is adjusted according to the comparison result, including: If the current supply and return water temperature difference is ≥ the upper limit of the supply and return water temperature difference setting range, the variable frequency water pumps of the heat pump group are increased in frequency until the current supply and return water temperature difference is within the supply and return water temperature difference setting range.

6. The method according to claim 5, characterized in that The control processing method of the cold station system also includes: If the variable frequency water pump of the heat pump group has reached the maximum frequency and the current supply and return water temperature difference is ≥ the upper limit of the supply and return water temperature difference setting range, if an unactivated heat pump group is detected, an additional heat pump group is activated.

7. The method according to claim 4, characterized in that The current supply and return water temperature difference is compared with the supply and return water temperature difference setting interval. When the current supply and return water temperature difference exceeds the supply and return water temperature difference setting interval, the frequency of the variable frequency water pumps in the heat pump group is adjusted according to the comparison result, including: If the current supply and return water temperature difference is ≤ the lower limit of the supply and return water temperature difference setting range, the variable frequency water pumps in the heat pump group will be reduced in frequency until the current supply and return water temperature difference is within the supply and return water temperature difference setting range.

8. The method according to claim 7, characterized in that The control processing method of the cold station system also includes: If the variable frequency water pump of the heat pump group has reached the minimum frequency and the current supply and return water temperature difference is ≤ the lower limit of the supply and return water temperature difference setting range, if it is detected that two or more heat pump groups have been turned on, one heat pump group will be turned off.

9. The method according to any one of claims 4 to 8, characterized in that: The control processing method of the cold station system also includes: If it is detected that only one group of heat pump groups is running, when it is detected that the load rate of the heat pump group is ≤ the preset load rate threshold and continues for a preset time, the running heat pumps in the heat pump group are reduced until the load rate of the heat pump group is greater than the preset load rate threshold.

10. A heat pump grouping processing device for a cold station system, characterized in that: The heat pump grouping processing device of the cold station system comprises: An acquisition module, used to obtain the hourly cooling load rate of the cooling station system; The first obtaining module is used to obtain the operating time proportion corresponding to each load rate segment by using the hourly cooling load rate of the cooling station system for a preset number of load interval segments; The second obtaining module is used to determine the value of the additional machine conversion point parameter corresponding to the load rate segment by the proportion of the operating time corresponding to the load rate segment; the heat pumps included in the cold station system are grouped by using the maximum cooling load rate in the load rate segment and the corresponding value of the additional machine conversion point parameter to obtain the heat pump group corresponding to the load rate segment, wherein the value of the additional machine conversion point parameter is used to adjust the number of heat pumps allocated to the heat pump group corresponding to the load rate segment; The operation time proportion corresponding to the load rate segment is used to determine the value of the additional machine conversion point parameter corresponding to the load rate segment; the heat pumps included in the cold station system are grouped using the maximum cooling load rate in the load rate segment and the corresponding value of the additional machine conversion point parameter to obtain the heat pump grouping corresponding to the load rate segment, including: When the number of the load interval segments is three, for the first load interval segment, according to N1=N*K1 / α, the number of heat pumps in the heat pump group corresponding to the first load interval segment is obtained; for the second load interval segment, according to N2=N*K2 / α-N1, the number of heat pumps in the heat pump group corresponding to the second load interval segment is obtained; for the third load interval segment, according to N3=N-N1-N2, the number of heat pumps in the heat pump group corresponding to the third load interval segment is obtained; The heat pumps included in the cooling station system are grouped according to the number of heat pumps in the heat pump group corresponding to each load interval segment; Among them, N1 is the number of heat pumps in the heat pump group corresponding to the first load interval segment, N2 is the number of heat pumps in the heat pump group corresponding to the second load interval segment, N3 is the number of heat pumps in the heat pump group corresponding to the third load interval segment, the first load interval segment, the second load interval segment and the third load interval segment are distributed in a load rate from small to large, N is the total number of heat pumps in the cold station system, K1 is the maximum cooling load rate in the first load interval segment, K2 is the maximum cooling load rate in the second load interval segment, K3 is the maximum cooling load rate in the third load interval segment, α is a preset system addition point parameter, when the operating time proportion corresponding to the load interval segment is ≤ the time proportion threshold, α is a value greater than or equal to 1, when the operating time proportion corresponding to the load interval segment is > the time proportion threshold, α is a value less than 1.

11. A control processing device for a cold station system, characterized in that: The cold station system comprises a heat pump group obtained by the method according to any one of claims 1 to 3, and the control processing device of the cold station system comprises: An acquisition module is used to perform frequency synchronization control on each heat pump in the heat pump group and obtain the current supply and return water temperature difference of the supply and return water main pipeline corresponding to the heat pump group; The frequency modulation module is used to compare the current supply and return water temperature difference with the supply and return water temperature difference setting range. When the current supply and return water temperature difference exceeds the supply and return water temperature difference setting range, the frequency of the variable frequency water pump of the heat pump group is adjusted according to the comparison result, wherein one heat pump group corresponds to one variable frequency water pump.

12. An electronic device, characterized in that: include: One or more memories on which executable programs are stored; One or more processors, configured to execute the executable program in the memory to implement the steps of the method according to any one of claims 1 to 3.

13. A cold station system, characterized in that: include: A plurality of heat pumps, wherein the plurality of heat pumps are formed into a plurality of heat pump groups using the method according to any one of claims 1 to 3; A plurality of variable frequency water pumps having the same number as the heat pump groups, wherein one variable frequency water pump is configured corresponding to one heat pump group; A controller, configured to execute the method according to any one of claims 4 to 9.

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