CN114440419A - Control method, device and equipment for secondary pump system of cold station and storage medium - Google Patents
Control method, device and equipment for secondary pump system of cold station and storage medium Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/85—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using variable-flow pumps
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Abstract
The embodiment of the invention discloses a control method, a control device, control equipment and a storage medium of a secondary pump system of a cold station. The method comprises the following steps: determining a secondary side temperature value according to the secondary side rated water flow, the predicted cooling capacity and the backwater temperature control value; determining working parameters of the refrigerator according to the secondary side temperature value and the selector combination; and determining the working parameters of the secondary side according to the working parameters of the refrigerator, the predicted cold quantity and the backwater temperature control value. According to the technical scheme provided by the embodiment of the invention, the working parameters of the secondary side are further determined by the relevant numerical values of the working parameters of the cold station, the predicted cold quantity and the control value of the return water temperature pipe, so that the working efficiency of a secondary pump and a cold machine in the secondary pump system of the cold station is improved, and the operation efficiency of the secondary pump system of the cold station is further improved.
Description
Technical Field
The embodiment of the invention relates to the field of cold station control, in particular to a control method, a control device, control equipment and a storage medium for a cold station secondary pump system.
Background
The cooling in the public building is realized by providing cold energy through the cold station, the consumption of the cold energy accounts for a large proportion, the operation efficiency of each device in the cold station is effectively improved, and the whole consumption of the cold energy in the cold station can be reduced.
In the prior art, the control of a secondary pump system of a cold station is usually a post-feedback control mode, and the control and adjustment are carried out by combining the running parameters of a cold machine and a water pump in the cold station after real-time data of the cold station is collected by a water supply and return temperature, a flow meter or related sensors installed in the cold station.
Disclosure of Invention
The embodiment of the invention provides a control method, a control device, control equipment and a storage medium of a secondary pump system of a cold station, and aims to realize the working efficiency of a refrigerator and a secondary pump in the secondary pump system of the cold station.
In a first aspect, an embodiment of the present invention provides a method for controlling a secondary pump system of a cold station, including:
determining a secondary side temperature value according to the secondary side rated water flow, the predicted cooling capacity and the backwater temperature control value;
determining the working parameters of the refrigerator according to the secondary side temperature value and the selector combination;
and determining the working parameters of the secondary side according to the working parameters of the cooler, the predicted cold quantity and the return water temperature control value.
Optionally, the cold station secondary pump system comprises a plurality of working branches;
determining a secondary side temperature value of each branch according to the secondary side rated water flow, the predicted cold quantity and the backwater temperature control value of each branch;
determining the working parameters of the refrigerator according to the secondary side temperature value and the sorting permutation and combination, wherein the working parameters comprise:
determining a secondary side temperature value of the cold station secondary pump system according to the secondary side temperature value of each branch;
and determining the working parameters of the refrigerator according to the secondary side temperature value of the secondary pump system of the cold station and the arrangement and combination of the selected refrigerator.
Optionally, determining the secondary side minimum rated water flow and the maximum rated water flow of each branch according to the rated power of the secondary pump and the number of the secondary pumps of each branch;
determining a minimum temperature value and a maximum temperature value of the secondary side of each branch according to the minimum rated water flow, the maximum rated water flow prediction cold quantity and the return water temperature control value of each branch;
and determining the minimum temperature value and the maximum temperature value of the secondary side of the cold station secondary pump system according to the minimum temperature value and the maximum temperature value of the secondary side of each branch.
Optionally, the cold station secondary pump system comprises a plurality of working branches;
determining the predicted total cold quantity according to the predicted cold quantity of each branch;
and generating a machine selection combination according to the predicted total cold quantity and the rated cold quantities of all the cold machines.
Optionally, the working quantity of the chiller and the set value of the outlet water temperature are determined according to the secondary side temperature value and the sorting arrangement combination.
Optionally, determining the secondary side actual water flow according to the working parameters of the cooler, the predicted cold quantity and the return water temperature control value;
determining the working quantity of the secondary pump according to the actual secondary side water flow and the rated water flow of the secondary pump;
and determining the actual working frequency of the secondary pump according to the secondary side actual water flow, the rated water flow of the secondary pump and the working quantity of the secondary pump.
In a second aspect, an embodiment of the present invention further provides a control device for a secondary pump system of a cold station, including:
the secondary side temperature value determining module is used for determining a secondary side temperature value according to the secondary side rated water flow, the predicted cooling capacity and the backwater temperature control value;
the cold machine working parameter determining module is used for determining the working parameters of the cold machine according to the secondary side temperature value and the selector combination;
and the secondary side working parameter determining module is used for determining the working parameters of the secondary side according to the working parameters of the cooler, the predicted cold quantity and the return water temperature control value.
In a third aspect, an embodiment of the present invention further provides a control device for a secondary pump system of a cold station, where the control device includes:
one or more processors;
a storage device for storing a plurality of programs,
when at least one of the programs is executed by the one or more processors, the one or more processors are enabled to implement the control method for the cold station secondary pump system provided by the embodiment of the first aspect of the present invention.
In a fourth aspect, the embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method for controlling a cold station secondary pump system according to any one of the embodiments of the present invention.
According to the embodiment of the invention, the temperature value of the secondary side is determined through the rated water flow of the secondary side, the predicted cold quantity and the set control value of the return water temperature, and meanwhile, the working parameters of the refrigerator are determined based on the temperature value of the secondary side and the generated combination of the refrigerator, wherein the working parameters of the refrigerator comprise the number of the refrigerators and the temperature set value of the refrigerator. And finally, determining the working parameters of the secondary side according to the predicted cold quantity of the secondary pump of the cold station, the backwater temperature control value of the secondary pump and the working parameters of the cold machine. The technical scheme provided by the invention solves the problem of ineffective loss of cooling capacity in the secondary pump system of the cooling station, and improves the working efficiency of the cold machine and the secondary pump in the secondary pump system of the cooling station.
Drawings
Fig. 1 is a schematic flow chart illustrating a method for controlling a secondary pump system of a cold station according to an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating a control method of a secondary pump system of a cold station according to a second embodiment of the present invention;
fig. 3 is a schematic flow chart illustrating a process of determining a secondary side outlet water temperature in a control method of a secondary pump system of a cold station according to a second embodiment of the present invention;
fig. 4 is a schematic flowchart of a control method of a secondary pump system of a cold station according to a third embodiment of the present invention;
fig. 5 is a schematic flow chart illustrating a control method of a secondary pump system of a cold station according to a fourth embodiment of the present invention;
fig. 6 is a schematic flow chart illustrating a process of determining a secondary pump frequency in a control method of a secondary pump system of a cold station according to a fourth embodiment of the present invention;
fig. 7 is a schematic flowchart of a control method of a secondary pump system of a cold station according to a fifth embodiment of the present invention;
fig. 8 is a schematic structural diagram of a control device of a secondary pump system of a cold station according to a sixth embodiment of the present invention
Fig. 9 is a schematic structural diagram of a control apparatus of a secondary pump of a cold station according to a seventh embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention.
It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings. Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently or simultaneously. In addition, the order of the operations may be re-arranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, and the like.
Example one
Fig. 1 is a schematic flow chart of a method for controlling a secondary pump system of a cold station according to an embodiment of the present invention, which may be applied to determining the number of secondary pumps, the frequency, and the number of cold machines operating in the secondary pump system of the cold station. The method specifically comprises the following steps:
and S110, determining a secondary side temperature value according to the secondary side rated water flow, the predicted cold quantity and the backwater temperature control value.
And the secondary side rated water flow refers to rated water flow of a secondary pump in the cold station. The secondary pump has a specific nominal water flow for installation in the cold station, belonging to a predetermined value. The predicted cold quantity can be predicted based on a ridge or an Istm model equation, so that the predicted cold quantity result has no obvious deviation from the actual cold quantity result in the cold station secondary pump system. The ridge model equation is also a linear model equation, and the prediction formula of the ridge model is the same as that of the ordinary least square method, except that additional constraint needs to be fitted in the ridge regression. The regression coefficient in the ridge regression equation is obviously higher than that of the common regression equation, in other words, the cold predicted by the ridge model equation is closer to the real situation. The return water temperature control value refers to a return water temperature value of a secondary pump flowing through a secondary system of the cold station, and can be a specific preset value. For example, the control value of the return water temperature may be 10 ℃, 15 ℃ or 20 ℃, where the specific control value of the return water temperature is not specifically limited and may be set according to different practical application scenarios and different secondary pump systems of the cold station in application.
Further, the secondary side temperature value refers to a water outlet temperature value of a secondary pump in the cold station system, and the water outlet temperature value of the secondary pump can also be understood as a water supply temperature value of the secondary pump. And realizing the outlet water temperature value of the secondary pump based on the known rated water flow of the secondary pump, the cold quantity predicted by the edge or Istm model equation and a preset return water temperature control value.
And S120, determining the working parameters of the refrigerator according to the secondary side temperature value and the selector combination.
The cold machine can provide cold energy for the cold station secondary pump system and reduce the temperature of the cold station secondary pump system. The cold machine can be a central air conditioner, and the required cold quantity is continuously provided in a cold station secondary pump system needing cooling. The working parameters of the cooler comprise the number of the coolers and the set value of the outlet water temperature of the cooler. A specific number of chillers are provided in the cold station secondary pump system, but not all chillers operate. According to the difference of the requirements of the secondary pump system coolers, the number of the coolers in working can be properly adjusted, the waste of cooler resources caused by simultaneously starting a plurality of coolers is avoided, and the energy consumption is reduced while the coolers are ensured to provide required cold capacity for the secondary pump system of a cold station.
Furthermore, the determination of the working parameters of the refrigerator can be realized in a combined mode of the selectors. The machine selection combination is that in all cold machines in standby state, a proper and proper cold machine set is reasonably selected. The selection machine combination can screen a part of coolers meeting the upper limit and the lower limit of the working frequency of the coolers, and only coolers with the working frequency within the upper limit and the lower limit can become standby coolers through screening. The specific selection combination can be obtained by predicting the specific value of the cold quantity and the number of the refrigerators meeting the conditions. For example, the number of coolers in the selector combination may be one, two or three, and here, the specific manner of combining the coolers is not particularly limited. And adjusting the specific selection combination according to the adaptability of the actual application scene. In addition, the secondary side temperature value also affects the operating parameters of the chiller, and when the operating parameters of the chiller are considered, the operating parameters of the chiller need to be determined by considering the secondary side temperature value and the selection unit.
And S130, determining the working parameters of the secondary side according to the working parameters, the predicted cold quantity and the return water temperature control value of the cooler.
The secondary side working parameter can also be understood as a working parameter of the secondary pump, and the working parameter of the secondary pump can be related information such as the working quantity and the working frequency of the secondary pump. And predicting the cold quantity required by the secondary pump system of the cold station, the return water temperature control value of the secondary pump and the working parameter of the refrigerator determined according to the secondary side temperature value and the selector combination through a ridge or Istm model equation to further determine the working parameter of the secondary side. In other words, the number of operations and the operating frequency of the secondary pump are determined. The working parameters of the secondary side can be correspondingly adjusted according to the changes of the working parameters of the cooler, the predicted cold quantity and the preset return water temperature control value.
According to the embodiment of the invention, the temperature value of the secondary side is determined through the rated water flow of the secondary side, the predicted cold quantity and the set control value of the return water temperature, and meanwhile, the working parameters of the refrigerator are determined based on the temperature value of the secondary side and the generated combination of the refrigerator, wherein the working parameters of the refrigerator comprise the number of the refrigerators and the temperature set value of the refrigerator. And finally, determining the working parameters of the secondary side according to the predicted cold quantity of the secondary pump of the cold station, the backwater temperature control value of the secondary pump and the working parameters of the cold machine. The technical scheme provided by the invention solves the problem of ineffective loss of cooling capacity in the secondary pump system of the cooling station, and improves the working efficiency of the cold machine and the secondary pump in the secondary pump system of the cooling station.
Example two
Fig. 2 is a schematic flowchart of a control method of a secondary pump system of a cold station according to a second embodiment of the present invention. The present embodiment is optimized based on the above embodiments, and in the present embodiment, the secondary side temperature values in different branches of the secondary pump system of the cold station and the operating parameters of the chiller are specifically expanded. On this basis, the method of the embodiment specifically includes the following steps:
s2101, determining a secondary side temperature value of each branch according to the secondary side rated water flow, the predicted cold quantity and the return water temperature control value of each branch.
The cold station secondary pump system comprises a plurality of working branches, one working branch corresponds to a group of secondary side rated water flow, a prediction cooler and a corresponding return water temperature control value, and then a secondary side temperature value of one working branch is determined. The multiple working branches in the secondary pump system of the cold station are independent and do not influence each other. For the secondary side temperature value of the whole cold station secondary pump system needs to be determined, the secondary side temperature value of each branch needs to be determined. The secondary side temperature value of each branch is obtained according to the secondary side rated water flow on each branch, the predicted cold quantity of the branch and the control value of the return water temperature on the branch.
Specifically, determining the secondary side temperature value of each branch according to the secondary side rated water flow, the predicted cold quantity and the return water temperature control value of each branch includes:
and determining the secondary side minimum rated water flow and the maximum rated water flow of each branch according to the rated power of the secondary pump and the number of the secondary pumps of each branch.
And determining the minimum temperature value and the maximum temperature value of the secondary side of each branch according to the minimum rated water flow, the maximum rated water flow prediction cold quantity and the return water temperature control value of each branch.
The rated power of the secondary pumps and the number of the secondary pumps are different on different branches. A different number of secondary pumps with different power ratings are arranged in one branch. When the secondary pumps on the branches all work according to the preset rated power, the water flow passing through the secondary pumps on the branches is maximum, and the maximum rated water flow of the branches is obtained; when one secondary pump on the branch works according to the preset rated power, the water flow passing through the secondary pump on the branch is minimum, and the minimum rated water flow of the branch is obtained. And further determining the minimum rated water flow and the maximum rated water flow of the branch according to the difference of the starting number of the secondary pumps on the branch.
Wherein, the maximum and minimum rated water flow of each branch can be obtained according to the number of the secondary pumps which are started on each branch and the rated power of the secondary pumps. The rated power upper limit and lower limit of the secondary pump on the branch can be preset, and the maximum and minimum rated flows of the branch can be further determined by setting the constraint upper limit and constraint lower limit.
Fig. 3 is a schematic flow chart for determining the temperature of the secondary side outlet water in the control method for the secondary pump system of the cold station according to the second embodiment of the present invention, as shown in fig. 3, one secondary pump in one branch is turned on, the actual power of the secondary pump is 20Hz, all the secondary pumps in one branch are turned on, and the actual power of each secondary pump is 50 Hz. When the rated water flow rate of the secondary pump in the branch is determined, the actual maximum water flow rate and the actual minimum water flow rate of the secondary pump can be determined according to a formula of the actual water flow rate of the secondary pump (the actual power of the secondary pump/the rated power of the secondary pump) to the rated water flow rate of the secondary pump to the number of the secondary pumps, and the actual maximum water flow rate and the actual minimum water flow rate are also determined correspondingly. The actual frequency of the secondary pump is selected according to the different number of the secondary pumps which are started. When the number of the secondary pumps is one, the actual power of the secondary pumps is 20Hz, when the secondary pumps are all started, the actual power of the secondary pumps is 50Hz, the rated power of the secondary pumps is in the range of 20Hz-50Hz, and the secondary pumps can be selected according to actual conditions. Preferably, the secondary pump is rated at 50 Hz. The actual maximum and minimum water flows on the secondary side can be known based on the actual water flow formula of the secondary pump. The cold quantity and the return water temperature of the secondary pump, the outlet water temperature of the secondary pump and the actual flow of the secondary pump have corresponding formula relations, namely, the cold quantity is (the return water temperature of the secondary pump-the outlet water temperature of the secondary pump) and the actual flow of the secondary pump. The predicted branch cold quantity is calculated based on a model, the return water temperature of the secondary pump is actually the branch return water temperature control value, and the maximum value and the minimum value of the outlet water temperature of the secondary pump can be obtained by substituting the actual maximum flow and the actual minimum flow of the secondary pump into the formula, and the corresponding minimum temperature value and the maximum temperature value of the secondary side are also obtained.
And S220, determining a secondary side temperature value of the secondary pump system of the cold station according to the secondary side temperature value of each branch.
The secondary side temperature value comprises a secondary side minimum temperature value and a secondary side maximum temperature value. The secondary side temperature value of each branch can be calculated according to a correlation formula, and the secondary side temperature value of the whole cold station secondary pump system is determined based on the secondary side temperature value of each branch.
Specifically, determining the secondary side temperature value of the cold station secondary pump system according to the secondary side temperature value of each branch comprises:
and determining the minimum temperature value and the maximum temperature value of the secondary side of the cold station secondary pump system according to the minimum temperature value and the maximum temperature value of the secondary side of each branch.
For example, the whole cold station secondary pump system has four branches, and the secondary side temperature values on the four branches can be obtained according to a formula, including the maximum secondary side temperature value and the minimum secondary side temperature value in the branches. And comparing the maximum secondary side temperature values and the minimum secondary side temperature values on the four branches to obtain the maximum secondary side temperature value and the minimum secondary side temperature value of the whole cold station secondary pump system.
And S230, determining the working parameters of the refrigerator according to the secondary side temperature value of the secondary pump system of the cold station and the arrangement and combination of the selected refrigerator.
The secondary side temperature value of the cold station secondary pump system can be determined according to the secondary side temperature value on each branch. And the secondary side temperature value of the whole cold station secondary pump system and the arrangement combination of the selection machines can influence the determination of the working parameters of the cold machine.
And S240, determining the working parameters of the secondary side according to the working parameters, the predicted cold quantity and the return water temperature control value of the cooler.
The method and the device determine the secondary side temperature value of the secondary pump system of the cold station through the secondary side rated water flow, the predicted cold quantity and the set return water temperature control value, wherein the secondary side temperature value comprises the maximum secondary side temperature value and the minimum secondary side temperature value, and simultaneously determine the working parameters of the cooler based on the secondary side temperature value and the generated selector combination, wherein the working parameters of the cooler comprise the number of the coolers and the temperature set value of the cooler. And finally, determining the working parameters of the secondary side in the secondary pump system of the cold station according to the predicted cold quantity of the secondary pump of the cold station, the backwater temperature control value of the secondary pump and the working parameters of the cold machine. The technical scheme provided by the invention solves the problem of ineffective loss of cooling capacity in the secondary pump system of the cooling station, and improves the working efficiency of the cold machine and the secondary pump in the secondary pump system of the cooling station.
EXAMPLE III
Fig. 4 is a schematic flow chart illustrating a control method of a secondary pump system of a cold station according to a third embodiment of the present invention. The present embodiment is optimized based on the above-mentioned embodiment, and in the present embodiment, the expansion of the operation parameter part of the refrigerator is determined for the generating and selecting unit combination in the cold station secondary pump system. On this basis, the method of the embodiment specifically includes the following steps:
and S310, determining a secondary side temperature value according to the secondary side rated water flow, the predicted cold quantity and the backwater temperature control value.
And S320, determining the predicted total cold quantity according to the predicted cold quantity of each branch.
The cold station secondary pump system comprises a plurality of working branches, the predicted cold capacity of each branch can be obtained by calculation according to a ridge or Istm model equation, and the calculation of the predicted total cold capacity is equal to the sum of the predicted cold capacities of each branch. And determining the predicted total cold capacity of the secondary pump system of the cold station according to the obtained predicted cold capacity of each branch.
And S330, generating a machine selection combination according to the predicted total cold capacity and the rated cold capacities of all the cold machines.
And the rated cold quantity which can be generated by all the coolers in the whole cold station secondary pump system is determined according to the rated set specification of the coolers. And drawing a cold output table according to the rated cold of all the coolers, and summarizing the specific rated cold numerical value of the cooler in each branch. And selecting a proper cold machine and generating a machine selection combination in a combination mode after finding the cold machine which is accordant with the predicted total cold quantity in the cold quantity output table in a table look-up mode.
And S340, determining the working quantity of the cold machines and the set value of the outlet water temperature according to the secondary side temperature value and the arrangement and combination of the machine selection machines.
And for the cold station secondary pump system, the secondary side temperature value is further determined according to the secondary side temperature value of each branch. The selection of the machine arrangement and combination mode can realize the screening of the cold machines which do not accord with the condition, and the combination of the cold machines which accord with the condition of the secondary side temperature value can be further screened by combining the secondary side temperature value of the secondary pump system of the cold station. And calculating the optimal selection combination through COP, and determining the number of the cold machines needing to work and the set value of the outlet water temperature of the cold machines based on the optimal selection combination. The outlet water temperature set value of the cooler is related to the working number of the cooler and the secondary side temperature value in the secondary pump system of the cold station, and the outlet water temperature set value of the cooler can be correspondingly set according to the actual situation, and is not specifically limited herein.
And S350, determining the working parameters of the secondary side according to the working parameters, the predicted cold quantity and the return water temperature control value of the cold machine.
According to the embodiment of the invention, the temperature value of the secondary side of the cold station secondary pump system is determined through the secondary side rated water flow, the predicted cooling capacity and the set return water temperature control value, the temperature value comprises the maximum temperature value and the minimum temperature value of the secondary side, and the machine selection combination is generated based on the cooling capacity output table generated by the predicted total cooling capacity and the rated cooling capacities of all the coolers. And further determining a proper refrigerator combination according to the secondary side temperature value of the secondary pump system of the cold station, and further determining the working quantity of the refrigerators and the set value of the outlet water temperature. And finally, determining the working parameters of the secondary side in the secondary pump system of the cold station according to the predicted cold quantity of the secondary pump of the cold station, the backwater temperature control value of the secondary pump and the working parameters of the cold machine. The technical scheme provided by the invention solves the problem of ineffective loss of cooling capacity in the secondary pump system of the cooling station, and improves the working efficiency of the cold machine and the secondary pump in the secondary pump system of the cooling station.
Example four
Fig. 5 is a schematic flow chart of a control method of a secondary pump system of a cold station according to a fourth embodiment of the present invention, which is optimized based on the foregoing embodiments, and in this embodiment, the expansion of the secondary side operating parameter determining part in the secondary pump system of the cold station is specifically performed. On this basis, the method of the embodiment specifically includes the following steps:
and S410, determining a secondary side temperature value according to the secondary side rated water flow, the predicted cold quantity and the backwater temperature control value.
And S420, determining the working parameters of the refrigerator according to the secondary side temperature value and the selector combination.
And S430, determining the secondary side actual water flow according to the working parameters, the predicted cold quantity and the backwater temperature control value of the cooler.
The working parameters of the cooler comprise the number of the coolers and the set value of the outlet water temperature of the cooler. And the actual secondary side water flow can be further determined according to the predicted branch cold quantity, the outlet water temperature set value of the cooler and the branch return water temperature control value. And (4) calculating the actual secondary side water flow based on the formula, wherein the predicted branch cold quantity is (the branch return water temperature control value-the outlet water temperature set value of the cooler) and the actual secondary side water flow coefficient.
And S440, determining the working quantity of the secondary pump according to the secondary side actual water flow and the rated water flow of the secondary pump.
The secondary side actual water flow rate, the rated water flow rate of the secondary pump and the working number of the secondary pump also have corresponding formulas, and the secondary side actual water flow rate is the rated water flow rate of the secondary pump and the working number of the secondary pump. The working number of the secondary pumps is the sum of the number of the secondary pumps which participate in the work. According to the above formula, the determination of the number of operations of the secondary pump can be achieved.
And S450, determining the actual working frequency of the secondary pump according to the secondary side actual water flow, the rated water flow of the secondary pump and the working quantity of the secondary pump.
The secondary side actual water flow rate is equal to (actual operating frequency of the secondary pump/rated operating frequency of the secondary pump) and the rated water flow rate of the secondary pump. The working number of the secondary pump, the actual water flow of the secondary pump and the rated water flow of the secondary pump can be determined by formula calculation or preset setting, and further the actual working frequency of the secondary pump can be realized.
Fig. 6 is a schematic flow chart illustrating a method for determining a secondary pump frequency in a control method of a secondary pump system in a cold station according to a fourth embodiment of the present invention. Selecting a branch in a secondary pump system of the cold station, predicting branch cold quantity of the branch through a model, and obtaining three related parameters of a preset branch return water temperature control value and a preset outlet water temperature set value of the cooler to determine actual water flow of the secondary side. And determining the frequency of the secondary pump according to the actual secondary side water flow, the rated secondary pump water flow and the number of working stations of the secondary pump. The secondary pump frequency is the actual secondary pump frequency.
According to the embodiment of the invention, the temperature value of the secondary side of the cold station secondary pump system is determined through the secondary side rated water flow, the predicted cold quantity and the set control value of the return water temperature, and the working quantity of the refrigerator and the set value of the outlet water temperature are determined according to the secondary side temperature value of the cold station secondary pump system. And finally, determining the actual working frequency of the secondary pump in the secondary pump system of the cold station according to the predicted cold quantity of the secondary pump of the cold station, the backwater temperature control value of the secondary pump and the working parameters of the cold machine. The technical scheme provided by the invention solves the problem of invalid loss of cooling capacity in the secondary pump system of the cooling station, and improves the working efficiency of the secondary pump and the middle cooler in the secondary pump system of the cooling station.
EXAMPLE five
On the basis of the foregoing embodiment, fig. 7 is a schematic flowchart of a control method of a secondary pump system of a cold station according to a fifth embodiment of the present invention, and as shown in fig. 7, a control strategy of a building a is specifically taken as an example for explanation. One secondary pump in the A floor is 50Hz, and the rated water flow of the A floor secondary pump is preset, so that the minimum water flow of the secondary side of the A floor is obtained. And all secondary pumps in the building A are started and are all 50Hz, and the secondary side maximum water flow of the building A can be obtained according to the rated water flow preset value of the secondary pumps. The predicted cold quantity of the building A can be calculated according to a corresponding model mode, and the return water temperature control value of the building A is preset. And obtaining the minimum value of the outlet water temperature of the secondary pump of the building A based on three related parameters of the minimum water flow of the secondary side of the building A, the control value of the return water temperature of the building A and the predicted cold quantity of the building A. Similarly, the maximum value of the outlet water temperature of the secondary pump of the building A can be obtained based on three related parameters of the maximum secondary side water flow of the building A, the control value of the return water temperature of the building A and the predicted cold quantity of the building A. In addition, the minimum value of the secondary pump water outlet temperature and the maximum value of the secondary pump water outlet temperature of the storied buildings B, C and D are obtained in a similar mode. After the minimum value and the maximum value of the outlet water temperature of the secondary pump of different unit buildings are obtained, the minimum value and the maximum value of the outlet water temperature of the secondary pump of the four unit buildings are compared, and then the minimum value and the maximum value of the outlet water temperature of the secondary pump system of the cold station are determined.
Furthermore, the predicted total cold quantity can be obtained through the predicted cold quantities of the branches of the building A, the building B, the building C and the building D, the rated cold quantity of the refrigerator in the secondary system of the cold station is preset and higher, the rated cold quantity of the refrigerator is drawn into a cold quantity output table, and the predicted total cold quantity can be generated into the selective machine permutation and combination of the refrigerator in a mode of searching the cold quantity output table. And screening the cold machine permutation combination meeting the conditions from the machine selection permutation combination by combining the minimum value and the maximum value of the water outlet temperature in the secondary pump of the cold station and the parameter setting range related to the cold machine. And calculating the optimal combination mode of the cold machine according to the COP, and further determining the number of working tables of the cold machine and the set value of the outlet water temperature of the cold machine. Actual water flow of secondary sides of different unit buildings is different, and the actual water flow is further determined according to a return water temperature control value in each branch, branch prediction cold quantity and an outlet water temperature set value of the cooler. The number of the secondary pumps is determined based on the actual water flow of the branch secondary side and the rated water flow of the secondary pumps, and the actual frequency of the branch secondary pumps is determined according to the number of the branch secondary pumps, the actual water flow of the branch secondary side and the rated water flow of the secondary pumps. In a similar way, the actual frequency of each secondary pump and the number of secondary pumps in different unit buildings can be calculated respectively. The number of the unit buildings is not particularly limited, and can be adaptively adjusted according to actual conditions.
EXAMPLE six
Fig. 8 is a schematic structural diagram of a control device of a cold station secondary pump system according to a sixth embodiment of the present invention, which can be applied to control aspects of the cold station secondary pump system, wherein the device can be implemented by software and/or hardware and is generally integrated on a computer, a server, or the like.
As shown in fig. 8, the apparatus includes: a secondary side temperature value determining module 510, a cold machine operating parameter determining module 520, a secondary side operating parameter determining module 530 and a selection combination generating module 540.
The secondary side temperature value determining module 510 is configured to determine a secondary side temperature value according to the secondary side rated water flow, the predicted cooling capacity, and the return water temperature control value.
And a cooler operating parameter determining module 520, configured to determine an operating parameter of the cooler according to the secondary-side temperature value and the selector combination.
And a secondary side working parameter determining module 530, configured to determine a secondary side working parameter according to the working parameter of the chiller, the predicted cooling capacity, and the return water temperature control value.
The unit selection combined generation module 540 is used for determining the predicted total cold quantity according to the predicted cold quantity of each branch; and generating a machine selection combination according to the predicted total cold capacity and the rated cold capacities of all the cold machines.
Further, the secondary side temperature value determining module 510 is further configured to determine a secondary side temperature value of each branch according to the secondary side rated water flow, the predicted cold amount, and the return water temperature control value of each branch. The secondary side temperature value determining module 510 is further configured to determine a secondary side minimum rated water flow and a maximum rated water flow of each branch according to the rated power of the secondary pumps and the number of the secondary pumps of each branch; determining a minimum temperature value and a maximum temperature value of the secondary side of each branch according to the minimum rated water flow, the maximum rated water flow prediction cold quantity and the return water temperature control value of each branch; the secondary side temperature value determining module 510 is further configured to determine a minimum temperature value and a maximum temperature value of the secondary side of the cold station secondary pump system according to the minimum temperature value and the maximum temperature value of the secondary side of each branch.
The cold machine working parameter determining module 520 is further configured to determine a secondary side temperature value of the cold station secondary pump system according to the secondary side temperature value of each branch; and determining the working parameters of the refrigerator according to the secondary side temperature value of the secondary pump system of the cold station and the arrangement and combination of the selected refrigerator.
The secondary side working parameter determining module 530 is further configured to determine the actual secondary side water flow according to the working parameter of the refrigerator, the predicted cooling capacity and the control value of the return water temperature; determining the working quantity of the secondary pump according to the actual secondary side water flow and the rated water flow of the secondary pump; and determining the actual working frequency of the secondary pump according to the actual secondary side water flow, the rated water flow of the secondary pump and the working quantity of the secondary pump.
The embodiment provides a control device of a secondary pump of a cold station, which determines a secondary side temperature value through a secondary side rated water flow, a predicted cooling capacity and a return water temperature control value, determines working parameters of a cold machine according to a secondary side temperature value and a selection machine combination, and finally determines the working parameters of the secondary side according to the working parameters of the cold machine, the predicted cooling capacity and the return water temperature control value. The control device for the secondary pump of the cold station provided by each embodiment can execute the control method for the secondary pump system of the cold station provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of executing the control method for the secondary pump of the cold station.
EXAMPLE seven
Fig. 9 is a schematic structural diagram of a control device of a secondary pump of a cold station according to a seventh embodiment of the present invention. As shown in fig. 9, a control device according to a seventh embodiment of the present invention includes: one or more processors 61 and storage 62; the processor 61 in the terminal device may be one or more, and one processor 61 is taken as an example in fig. 9; storage 62 is used to store one or more programs; the one or more programs are executed by the one or more processors 61 such that the one or more processors 61 implement a method of controlling a cold station secondary pump system as any one of the embodiments of the present invention.
The control apparatus may further include: an input device 63 and an output device 64.
The processor 61, the storage device 62, the input device 463 and the output device 64 in the control apparatus may be connected by a bus or other means, and the connection by the bus is exemplified in fig. 8.
The storage device 62 in the control apparatus is used as a computer-readable storage medium and can be used for storing one or more programs, which may be software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the control method of the secondary pump system of the cold station according to the first, second, third, and fourth embodiments of the present invention (for example, modules in the control device of the secondary pump of the cold station shown in fig. 8 include a secondary side temperature value determining module, a chiller operating parameter determining module, a secondary side operating parameter determining module, and an optional combination generating module). The processor 61 executes various functional applications and data processing of the terminal device by running software programs, instructions and modules stored in the storage device 62, that is, implements the control method of the cold station secondary pump system in the above method embodiment.
The storage device 62 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the control apparatus, and the like. Further, the storage device 62 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the storage device 62 may further include memory located remotely from the processor 61, which may be connected to the device over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 63 is operable to receive input numeric or character information and to generate key signal inputs relating to user settings and function control of the control apparatus. The output device 64 may include a display device such as a display screen.
Example eight
An eighth embodiment of the present invention provides a computer-readable storage medium having stored thereon a computer program, which when executed by a processor, is configured to perform a method for controlling a cold station secondary pump system, the method including: determining a secondary side temperature value according to the secondary side rated water flow, the predicted cooling capacity and the backwater temperature control value; determining working parameters of the refrigerator according to the secondary side temperature value and the selector combination; and determining the working parameters of the secondary side according to the working parameters of the refrigerator, the predicted cold quantity and the backwater temperature control value.
Optionally, the program, when executed by the processor, may be further configured to perform a method for controlling a cold station secondary pump system according to any embodiment of the present invention.
Computer storage media for embodiments of the invention may employ any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a Read Only Memory (ROM), an Erasable Programmable Read Only Memory (EPROM), a flash Memory, an optical fiber, a portable CD-ROM, an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. A computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take a variety of forms, including, but not limited to: an electromagnetic signal, an optical signal, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, fiber optic cable, Radio Frequency (RF), etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + +, or the like, as well as conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A control method of a cold station secondary pump system is characterized by comprising the following steps:
determining a secondary side temperature value according to the secondary side rated water flow, the predicted cooling capacity and the backwater temperature control value;
determining working parameters of the refrigerator according to the secondary side temperature value and the selector combination;
and determining the working parameters of the secondary side according to the working parameters of the cooler, the predicted cold quantity and the return water temperature control value.
2. The control method of claim 1, wherein the cold station secondary pump system comprises a plurality of working branches;
determining a secondary side temperature value according to the secondary side rated water flow, the predicted cooling capacity and the backwater temperature control value, wherein the secondary side temperature value comprises the following steps:
determining a secondary side temperature value of each branch according to the secondary side rated water flow, the predicted cold quantity and the backwater temperature control value of each branch;
determining the working parameters of the refrigerator according to the secondary side temperature value and the sorting permutation and combination, wherein the working parameters comprise:
determining a secondary side temperature value of the cold station secondary pump system according to the secondary side temperature value of each branch;
and determining the working parameters of the refrigerator according to the secondary side temperature value of the secondary pump system of the cold station and the arrangement and combination of the selected refrigerator.
3. The control method according to claim 2, wherein the step of determining the secondary side temperature value of each branch according to the secondary side rated water flow, the predicted cooling capacity and the return water temperature control value of each branch comprises the following steps:
determining the secondary side minimum rated water flow and the maximum rated water flow of each branch according to the rated power of the secondary pump and the number of the secondary pumps of each branch;
determining a minimum temperature value and a maximum temperature value of the secondary side of each branch according to the minimum rated water flow, the maximum rated water flow prediction cold quantity and the return water temperature control value of each branch;
determining a secondary side temperature value of the cold station secondary pump system according to the secondary side temperature value of each branch, comprising:
and determining the minimum temperature value and the maximum temperature value of the secondary side of the cold station secondary pump system according to the minimum temperature value and the maximum temperature value of the secondary side of each branch.
4. The control method according to claim 1, before determining the operating parameters of the chiller according to the secondary side temperature value and the bank combination, further comprising:
and generating the option combination.
5. The control method of claim 4, wherein the cold station secondary pump system comprises a plurality of working branches;
generating a selector combination comprising:
determining the predicted total cold quantity according to the predicted cold quantity of each branch;
and generating a machine selection combination according to the predicted total cold quantity and the rated cold quantities of all the cold machines.
6. The control method according to claim 1, wherein determining the operating parameters of the chiller according to the secondary side temperature value and the bank combination comprises:
and determining the working quantity of the cold machine and a set value of the outlet water temperature according to the secondary side temperature value and the arrangement and combination of the machine selectors.
7. The control method according to claim 1, wherein determining the secondary side operating parameters according to the chiller operating parameters, the predicted cooling capacity and the return water temperature control value comprises:
determining the actual secondary side water flow according to the working parameters of the cooler, the predicted cold quantity and the return water temperature control value;
determining the working quantity of the secondary pump according to the actual secondary side water flow and the rated water flow of the secondary pump;
and determining the actual working frequency of the secondary pump according to the secondary side actual water flow, the rated water flow of the secondary pump and the working quantity of the secondary pump.
8. A control device of a cold station secondary pump system, comprising:
the secondary side temperature value determining module is used for determining a secondary side temperature value according to the secondary side rated water flow, the predicted cooling capacity and the backwater temperature control value;
the cold machine working parameter determining module is used for determining the working parameters of the cold machine according to the secondary side temperature value and the selector combination;
and the secondary side working parameter determining module is used for determining the working parameters of the secondary side according to the working parameters of the cooler, the predicted cold quantity and the return water temperature control value.
9. A control apparatus for a cold station secondary pump system, the control apparatus comprising:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the control method of any one of claims 1-7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the control method according to any one of claims 1 to 7.
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