Energy-saving control system for cold storage refrigeration station

Abstract

The invention discloses an energy-saving control system for a cold storage refrigeration station, and relates to the technical field of refrigeration energy-saving control. The system comprises an in-station temperature module, an out-station temperature module, a central processing unit, a refrigeration power consumption module, a cold storage power consumption module and a flow control unit, and the output ends of the in-station temperature module, the out-station temperature module, the refrigeration power consumption module and the cold storage power consumption module are connected with the input end of the central processing unit. The output end of the central processing unit is connected with the input end of the flow control unit, the flow control unit comprises n regional flow modules, each regional flow module comprises m node flow modules, and the output end of the central processing unit is connected with the input end of each regional flow module; according to the system and the method, the total power consumption of the refrigeration station can reach the minimum through automatic analysis and adjustment of the regional flow and the node flow of chilled water storage, and the effects of energy conservation and cold storage are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of refrigeration energy-saving control, and in particular to an energy-saving control system for a cold storage refrigeration station. Background Art

[0002] The cold storage system of the refrigeration station can reduce the power consumption of air conditioners during the day and reduce electricity costs. At night, the low electricity price period is used for cooling and cold storage. The stored cold capacity can meet the load requirements of the refrigeration unit the next day, balancing the refrigeration efficiency of the refrigeration unit and the economic benefits of electricity demand.

[0003] There are two main types of cold storage technology. One is ice storage, which makes water into ice when the electricity price is low at night, and uses the latent heat of ice phase change to store cold. The stored cold is released by melting the ice during the day. The other is water storage, which uses the sensible heat of water to store cold. During the peak hours of electricity consumption in the day, the stored low-temperature chilled water is used to provide refrigeration. The water storage tank can also be shared with the fire water tank, saving the construction cost of the fire water tank. The current cold storage system mainly considers the price difference between peak and valley electricity prices to improve the economic benefits of electricity use, and cannot play a role in energy saving. Different water storage flow rates will affect the power consumption of the refrigeration unit and the cold storage unit. The appropriate water storage flow rate can minimize the total power consumption of the refrigeration unit and the cold storage unit, thereby achieving the energy-saving purpose of the refrigeration station. Therefore, automatically matching the appropriate water storage flow rate of the refrigeration station is a technical problem that technicians in this field need to solve. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an energy-saving control system for a cold storage refrigeration station, which solves the problems raised in the above-mentioned background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: an energy-saving control system for a cold storage refrigeration station, comprising an in-station temperature module, an out-station temperature module, a central processing unit, a refrigeration power consumption module, a cold storage power consumption module and a flow control unit, wherein the output ends of the in-station temperature module, the out-station temperature module, the refrigeration power consumption module and the cold storage power consumption module are connected to the input end of the central processing unit, the output end of the central processing unit is connected to the input end of the flow control unit, the flow control unit comprises n regional flow modules, the regional flow module comprises m node flow modules, the output end of the central processing unit is respectively connected to the input end of each regional flow module, and the output end of the regional flow is connected to the input end of each node flow; The external temperature module obtains the external ambient temperature t1 of the refrigeration station and transmits it to the central processing unit, the internal temperature module obtains the internal ambient temperature t2 of the refrigeration station and transmits it to the central processing unit, the refrigeration power consumption module obtains the power consumption p1 of the refrigeration unit and transmits it to the central processing unit, the cold storage power consumption module obtains the power consumption p2 of the cold storage unit and transmits it to the central processing unit, the power consumption p1 and the power consumption p2 are both in kilowatts, the regional flow module controls the cold storage water flow of each area in the refrigeration station, and the node flow module controls the cold storage water flow of each branch in the area of ​​the cold east station; The central processing unit presets a first cycle of 24 hours, a second cycle of 30 minutes, a third cycle of 6 seconds, a first change threshold of ±8%, a second change threshold of ±3.2% and a third change threshold of ±1%. When the change of the ambient temperature t1 outside the station obtained by the central processing unit in the first cycle exceeds the first change threshold, the central processing unit executes a first flow analysis program to obtain a total flow balance point b1, and the central processing unit transmits the total flow balance point b1 to all regional flow modules. All regional flow modules adjust their own cold storage water flow according to the total flow balance point b1. When the change of the ambient temperature t1 outside the station obtained by the central processing unit in the second cycle exceeds the second change threshold, the central processing unit executes a second flow analysis program to obtain a regional flow balance point b2 for each regional flow module. The central processing unit transmits the regional flow balance point b1 to all regional flow modules. The quantity balance point b2 is transmitted to the corresponding regional flow module, and each regional flow module adjusts its own cold storage water flow according to the regional flow balance point b2. When the change of any one of the external ambient temperature t1 and the internal ambient temperature t2 obtained by the central processing unit within the third period exceeds the third change threshold, the central processing unit executes the third flow analysis program to obtain the node flow balance point b3, and the central processing unit transmits the node flow balance point b3 to the corresponding node flow module. Each node flow module adjusts its own cold storage water flow according to the node flow balance point b3. The acquisition frequency r of the external temperature module, the internal temperature module, the refrigeration power consumption module and the cold storage power consumption module is adaptively adjusted according to the change amplitude of the external ambient temperature t1, the internal ambient temperature t2, the power consumption p1 of the refrigeration unit and the power consumption p2 of the cold storage unit.

[0006] Furthermore, when the first flow analysis program is executed, the central processing unit establishes a first curve graph, the abscissa of the first curve graph is time, the unit is seconds, and the ordinate is temperature, the unit is degrees Celsius, and the central processing unit inputs the external environment temperature t1 into the first curve graph to obtain a first external environment temperature curve; The central processing unit marks the time point when the outside environment temperature t1 exceeds the first change threshold value ±8% as the first trigger point in the first cycle, the central processing unit records the duration T1 from the beginning of the first cycle to the first trigger point, the central processing unit marks the first outside environment temperature curve within the duration T1 as the first trigger curve, the central processing unit obtains the outside environment temperature t1 at the beginning of the first cycle and marks it as tc1, and the central processing unit obtains the outside environment temperature t1 at the first trigger point and marks it as tc2; The central processing unit is based on the formula Calculate the slope k1 of the first trigger curve, the central processing unit presets the first test interval range1, and the central processing unit calculates the slope k1 of the first trigger curve according to the formula Calculate the value range of the first test interval range1, where w1 and w2 are proportional coefficients, w1 and w2 satisfy the condition w1+w2=1, and the specific values ​​of w1 and w2 are determined according to the rated power of the refrigeration unit and the cold storage unit; The central processing unit calculates the average flow value of all regional flow modules , the central processing unit will The adjustment range is sent to all regional flow modules, and all regional flow modules follow The adjustment range is from low to high to adjust its own cold storage water flow; Each time the regional flow module adjusts its own cold storage water flow, the central processing unit calculates the total power consumption zp of the power consumption p1 of the refrigeration unit and the power consumption p2 of the cold storage unit. When the adjustment range is fully executed, the central processing unit marks the regional flow module cold water flow corresponding to the minimum value of the total power consumption zp as the total flow balance point b1.

[0007] Furthermore, when the second flow analysis program is executed, the central processing unit establishes a second curve graph, the abscissa of the second curve graph is time in seconds, and the ordinate is temperature in degrees Celsius, and the central processing unit inputs the external environment temperature t1 into the second curve graph to obtain a second external environment temperature curve; The central processing unit marks the time point when the outside environment temperature t1 exceeds the second change threshold value ±3.2% as the second trigger point in the second cycle, the central processing unit records the duration T2 from the start of the second cycle to the second trigger point, the central processing unit marks the second outside environment temperature curve within the duration T2 as the second trigger curve, the central processing unit obtains the outside environment temperature t1 at the start of the second cycle and marks it as tc3, and the central processing unit obtains the outside environment temperature t1 at the first trigger point and marks it as tc4; The central processing unit is based on the formula Calculate the slope k2 of the second trigger curve, the central processing unit presets the second test interval range2, and the central processing unit calculates the slope k2 of the second trigger curve according to the formula Calculate the value range of the second test interval range2, where w3 and w4 are proportional coefficients, w3 and w4 satisfy the condition w3+w4=0.64, and w3 and w4 are determined according to the rated power of the refrigeration unit and the cold storage unit; The central processing unit will The adjustment range is sent to each regional flow module, and each regional flow module follows The adjustment range is from low to high to adjust its own cold storage water flow; Each time each regional flow module adjusts its own cold storage water flow, the central processing unit calculates the total power consumption qp of the power consumption p1 of the refrigeration unit and the power consumption p2 of the cold storage unit. When the adjustment range is fully executed, the central processing unit marks the cold storage water flow corresponding to the minimum value of the total power consumption qp of each regional flow module as the regional flow balance point b2 of the regional flow module.

[0008] Furthermore, when the third flow analysis program is executed, the central processing unit establishes a third curve graph, the abscissa of the third curve graph is time, the unit is seconds, and the ordinate is temperature, the unit is degrees Celsius, and the central processing unit inputs the external environment temperature t1 and the internal environment temperature t2 into the third curve graph to obtain a third external environment temperature curve and an internal environment temperature curve; If the third flow analysis program is triggered by a change in the ambient temperature t1 outside the station, the external analysis process is executed; if the third flow analysis program is triggered by a change in the ambient temperature t2 inside the station, the internal analysis process is executed; When the off-site analysis process is executed, the central processing unit marks the time point when the off-site environment temperature t1 exceeds the third change threshold value ±1% as the third trigger point in the third cycle, the central processing unit records the duration T3a from the start of the third cycle to the third trigger point, the central processing unit marks the third off-site environment temperature curve within the duration T3a as the third trigger curve, the central processing unit obtains the off-site environment temperature t1 at the start of the third cycle and marks it as tc5, and the central processing unit obtains the off-site environment temperature t1 at the third trigger point and marks it as tc6; The central processing unit is based on the formula Calculate the slope k3 of the third trigger curve, the central processing unit presets the third test interval range3, and the central processing unit calculates the slope k3 of the third trigger curve according to the formula Calculate the value range of the third test interval range3, where w5 and w6 are proportional coefficients, w5 and w6 satisfy the condition w5+w6=0.36, and the specific values ​​of w5 and w6 are determined according to the rated power of the refrigeration unit and the cold storage unit; The central processing unit will The adjustment range is sent to each regional flow module, and the regional flow module will The adjustment range is sent to each node flow module, and each node flow module follows The adjustment range is from low to high to adjust its own cold storage water flow; Each time each node flow module adjusts its own cold storage water flow, the central processing unit calculates the total power consumption jpa of the power consumption p1 of the refrigeration unit and the power consumption p2 of the cold storage unit. When all the adjustment ranges are executed, the central processing unit marks the cold storage water flow corresponding to the minimum value of the total power consumption jpa of each node flow module as the node flow balance point b3 of the node flow module; When the in-station analysis process is executed, the central processing unit marks the time point when the in-station ambient temperature t2 exceeds the third change threshold ±1% as the fourth trigger point in the third cycle, the central processing unit records the duration T3b from the start of the third cycle to the fourth trigger point, the central processing unit marks the in-station ambient temperature curve within the duration T3b as the fourth trigger curve, the central processing unit obtains the in-station ambient temperature t2 at the start of the third cycle and marks it as tc7, and the central processing unit obtains the in-station ambient temperature t2 at the fourth trigger point and marks it as tc8; The central processing unit is based on the formula Calculate the slope k4 of the fourth trigger curve, the central processing unit presets the fourth test interval range4, and the central processing unit calculates the slope k4 of the fourth trigger curve according to the formula Calculate the value range of the fourth test interval range4, where w7 and w8 are proportional coefficients, w7 and w8 satisfy the condition w7+w8=0.16, and the specific values ​​of w7 and w8 are determined according to the rated power of the refrigeration unit and the cold storage unit; The central processing unit will The adjustment range is sent to each regional flow module, and the regional flow module will The adjustment range is sent to each node flow module, and each node flow module follows The adjustment range is from low to high to adjust its own cold storage water flow; Each time each node flow module adjusts its own cold storage water flow, the central processing unit calculates the total power consumption jpb of the power consumption p1 of the refrigeration unit and the power consumption p2 of the cold storage unit. When the adjustment range is fully executed, the central processing unit marks the cold storage water flow corresponding to the minimum value of the total power consumption jpb of each node flow module as the node flow balance point b3 of the node flow module.

[0009] Further, the acquisition frequency r includes the acquisition frequency t1r of the external temperature module, the acquisition frequency t2r of the internal temperature module, the acquisition frequency p1r of the cooling power consumption module, and the acquisition frequency p2r of the cold storage power consumption module; The central processing unit marks the adjacent external station ambient temperatures t1 as t1f and t1g, the central processing unit marks the adjacent internal station ambient temperatures t2 as t2f and t2g, the central processing unit marks the adjacent power consumption p1 of the refrigeration units as p1f and p1g, and the central processing unit marks the adjacent power consumption p2 of the cold storage units as p2f and p2g; The central processing unit is based on the formula Calculate the acquisition frequency t1r of the temperature module outside the station, and the central processing unit uses the formula Calculate the acquisition frequency t2r of the temperature module outside the station, and the central processing unit uses the formula Calculate the acquisition frequency p1r of the temperature module outside the station, and the central processing unit uses the formula Calculate the acquisition frequency p2r of the temperature module outside the station, and realize adaptive adjustment of data acquisition by continuously calculating the acquisition frequency r.

[0010] Furthermore, the central processing unit presets a first protection time of 30 minutes and a second protection time of 1 minute. When either the first traffic analysis program or the second traffic analysis program is executed, it will automatically enter the first protection time. When the third traffic analysis program is executed, it will automatically enter the second protection time, thereby avoiding the first change threshold, the second change threshold and the third change threshold from being triggered too quickly, thereby ensuring stable operation of the system.

[0011] The present invention has the following beneficial effects: 1. By analyzing and adjusting the regional flow and node flow of water cold storage, the total power consumption of the refrigeration unit and cold storage unit of the refrigeration station can be minimized, achieving the effect of energy saving and cold storage.

[0012] 2. By setting the protection time, the first change threshold, the second change threshold and the third change threshold are prevented from being triggered too quickly, thereby ensuring stable operation of the system.

[0013] 3. By adjusting the acquisition frequency r, the amount of collected data can be reduced when the change range is small, reducing the computing pressure of the central processing unit. When the change range is large, the collection interval time can be reduced, the response speed of the system can be improved, and the execution inertia of the system can be reduced.

[0014] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0016] Figure 1 This is a block diagram of an energy-saving control system for a cold storage refrigeration station of the present invention; Figure 2 It is the internal schematic diagram of the flow control unit of the present invention. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1 The present invention provides a technical solution: an energy-saving control system for a cold storage refrigeration station, comprising an in-station temperature module, an out-station temperature module, a central processing unit, a refrigeration power consumption module, a cold storage power consumption module and a flow control unit, wherein the output ends of the in-station temperature module, the out-station temperature module, the refrigeration power consumption module and the cold storage power consumption module are connected to the input end of the central processing unit, and the output end of the central processing unit is connected to the input end of the flow control unit, such as Figure 2 As shown, the flow control unit includes n regional flow modules, the regional flow module includes m node flow modules, the output end of the central processing unit is connected to the input end of each regional flow module respectively, and the output end of the regional flow is connected to the input end of each node flow; The external temperature module obtains the external ambient temperature t1 of the refrigeration station and transmits it to the central processing unit. The internal temperature module obtains the internal ambient temperature t2 of the refrigeration station and transmits it to the central processing unit. The refrigeration power consumption module obtains the power consumption p1 of the refrigeration unit and transmits it to the central processing unit. The cold storage power consumption module obtains the power consumption p2 of the cold storage unit and transmits it to the central processing unit. The power consumption p1 and p2 are both in kilowatts. The regional flow module controls the cold storage water flow in each area of ​​the refrigeration station. The node flow module controls the cold storage water flow in each branch of the cold east station. The central processing unit presets a first cycle of 24 hours, a second cycle of 30 minutes, a third cycle of 6 seconds, a first change threshold of ±8%, a second change threshold of ±3.2% and a third change threshold of ±1%. When the change of the external ambient temperature t1 obtained by the central processing unit in the first cycle exceeds the first change threshold, the central processing unit executes a first flow analysis program to obtain a total flow balance point b1, and the central processing unit transmits the total flow balance point b1 to all regional flow modules. All regional flow modules adjust their own cold storage water flow according to the total flow balance point b1. When the change of the external ambient temperature t1 obtained by the central processing unit in the second cycle exceeds the second change threshold, the central processing unit executes a second flow analysis program to obtain a regional flow balance point b2 for each regional flow module. The central processing unit transmits the regional flow balance point b1 to all regional flow modules. The balance point b2 is transmitted to the corresponding regional flow module, and each regional flow module adjusts its own cold storage water flow according to the regional flow balance point b2. When the change of any one of the external ambient temperature t1 and the internal ambient temperature t2 obtained by the central processing unit within the third period exceeds the third change threshold, the central processing unit executes the third flow analysis program to obtain the node flow balance point b3. The central processing unit transmits the node flow balance point b3 to the corresponding node flow module, and each node flow module adjusts its own cold storage water flow according to the node flow balance point b3. The acquisition frequency r of the external temperature module, the internal temperature module, the refrigeration power consumption module and the cold storage power consumption module is adaptively adjusted according to the change amplitude of the external ambient temperature t1, the internal ambient temperature t2, the power consumption p1 of the refrigeration unit and the power consumption p2 of the cold storage unit.

[0019] When the first flow analysis program is executed, the central processing unit establishes a first curve graph, the abscissa of the first curve graph is time, the unit is seconds, and the ordinate is temperature, the unit is degrees Celsius. The central processing unit inputs the external environment temperature t1 into the first curve graph to obtain a first external environment temperature curve; The central processing unit marks the time point when the outside environment temperature t1 exceeds the first change threshold value ±8% as the first trigger point in the first cycle, the central processing unit records the duration T1 from the beginning of the first cycle to the first trigger point, the central processing unit marks the first outside environment temperature curve within the duration T1 as the first trigger curve, the central processing unit obtains the outside environment temperature t1 at the beginning of the first cycle and marks it as tc1, and the central processing unit obtains the outside environment temperature t1 at the first trigger point and marks it as tc2; The central processing unit is based on the formula Calculate the slope k1 of the first trigger curve, the central processing unit presets the first test interval range1, and the central processing unit calculates the slope k1 of the first trigger curve according to the formula Calculate the value range of the first test interval range1, where w1 and w2 are proportional coefficients, w1 and w2 satisfy the condition w1+w2=1, and the specific values ​​of w1 and w2 are determined according to the rated power of the refrigeration unit and the cold storage unit; The central processing unit calculates the average flow value of all regional flow modules , the central processing unit will The adjustment range is sent to all regional flow modules, and all regional flow modules follow The adjustment range is from low to high to adjust its own cold storage water flow; Each time the regional flow module adjusts its own cold storage water flow, the central processing unit calculates the total power consumption zp of the power consumption p1 of the refrigeration unit and the power consumption p2 of the cold storage unit. When the adjustment range is fully executed, the central processing unit marks the regional flow module cold water flow corresponding to the minimum value of the total power consumption zp as the total flow balance point b1.

[0020] When the second flow analysis program is executed, the central processing unit creates a second curve graph, the abscissa of the second curve graph is time, the unit is seconds, the ordinate is temperature, the unit is degrees Celsius, and the central processing unit inputs the external environment temperature t1 into the second curve graph to obtain a second external environment temperature curve; The central processing unit marks the time point when the outside environment temperature t1 exceeds the second change threshold value ±3.2% as the second trigger point in the second cycle, the central processing unit records the duration T2 from the start of the second cycle to the second trigger point, the central processing unit marks the second outside environment temperature curve within the duration T2 as the second trigger curve, the central processing unit obtains the outside environment temperature t1 at the start of the second cycle and marks it as tc3, and the central processing unit obtains the outside environment temperature t1 at the first trigger point and marks it as tc4; The central processing unit is based on the formula Calculate the slope k2 of the second trigger curve, the central processing unit presets the second test interval range2, and the central processing unit calculates the slope k2 of the second trigger curve according to the formula Calculate the value range of the second test interval range2, where w3 and w4 are proportional coefficients, w3 and w4 satisfy the condition w3+w4=0.64, and w3 and w4 are determined according to the rated power of the refrigeration unit and the cold storage unit; The central processing unit will The adjustment range is sent to each regional flow module, and each regional flow module follows The adjustment range is from low to high to adjust its own cold storage water flow; Each time each regional flow module adjusts its own cold storage water flow, the central processing unit calculates the total power consumption qp of the power consumption p1 of the refrigeration unit and the power consumption p2 of the cold storage unit. When the adjustment range is fully executed, the central processing unit marks the cold storage water flow corresponding to the minimum value of the total power consumption qp of each regional flow module as the regional flow balance point b2 of the regional flow module.

[0021] When the third flow analysis program is executed, the central processing unit establishes a third curve graph, the abscissa of the third curve graph is time, the unit is seconds, and the ordinate is temperature, the unit is degrees Celsius. The central processing unit inputs the external environment temperature t1 and the internal environment temperature t2 into the third curve graph to obtain a third external environment temperature curve and an internal environment temperature curve; If the third flow analysis program is triggered by a change in the ambient temperature t1 outside the station, the external analysis process is executed; if the third flow analysis program is triggered by a change in the ambient temperature t2 inside the station, the internal analysis process is executed; When the off-site analysis process is executed, the central processing unit marks the time point when the off-site environment temperature t1 exceeds the third change threshold value ±1% as the third trigger point in the third cycle, the central processing unit records the duration T3a from the start of the third cycle to the third trigger point, the central processing unit marks the third off-site environment temperature curve within the duration T3a as the third trigger curve, the central processing unit obtains the off-site environment temperature t1 at the start of the third cycle and marks it as tc5, and the central processing unit obtains the off-site environment temperature t1 at the third trigger point and marks it as tc6; The central processing unit is based on the formula Calculate the slope k3 of the third trigger curve, the central processing unit presets the third test interval range3, and the central processing unit calculates the slope k3 of the third trigger curve according to the formula Calculate the value range of the third test interval range3, where w5 and w6 are proportional coefficients, w5 and w6 satisfy the condition w5+w6=0.36, and the specific values ​​of w5 and w6 are determined according to the rated power of the refrigeration unit and the cold storage unit; The central processing unit will The adjustment range is sent to each regional flow module, and the regional flow module will The adjustment range is sent to each node flow module, and each node flow module follows The adjustment range is from low to high to adjust its own cold storage water flow; Each time each node flow module adjusts its own cold storage water flow, the central processing unit calculates the total power consumption jpa of the power consumption p1 of the refrigeration unit and the power consumption p2 of the cold storage unit. When all the adjustment ranges are executed, the central processing unit marks the cold storage water flow corresponding to the minimum value of the total power consumption jpa of each node flow module as the node flow balance point b3 of the node flow module; When the in-station analysis process is executed, the central processing unit marks the time point when the in-station ambient temperature t2 exceeds the third change threshold ±1% as the fourth trigger point in the third cycle, the central processing unit records the duration T3b from the start of the third cycle to the fourth trigger point, the central processing unit marks the in-station ambient temperature curve within the duration T3b as the fourth trigger curve, the central processing unit obtains the in-station ambient temperature t2 at the start of the third cycle and marks it as tc7, and the central processing unit obtains the in-station ambient temperature t2 at the fourth trigger point and marks it as tc8; The central processing unit is based on the formula Calculate the slope k4 of the fourth trigger curve, the central processing unit presets the fourth test interval range4, and the central processing unit calculates the slope k4 of the fourth trigger curve according to the formula Calculate the value range of the fourth test interval range4, where w7 and w8 are proportional coefficients, w7 and w8 satisfy the condition w7+w8=0.16, and the specific values ​​of w7 and w8 are determined according to the rated power of the refrigeration unit and the cold storage unit; The central processing unit will The adjustment range is sent to each regional flow module, and the regional flow module will The adjustment range is sent to each node flow module, and each node flow module follows The adjustment range is from low to high to adjust its own cold storage water flow; Each time each node flow module adjusts its own cold storage water flow, the central processing unit calculates the total power consumption jpb of the power consumption p1 of the refrigeration unit and the power consumption p2 of the cold storage unit. When the adjustment range is fully executed, the central processing unit marks the cold storage water flow corresponding to the minimum value of the total power consumption jpb of each node flow module as the node flow balance point b3 of the node flow module.

[0022] Among them, the acquisition frequency r includes the acquisition frequency t1r of the external temperature module, the acquisition frequency t2r of the internal temperature module, the acquisition frequency p1r of the refrigeration power consumption module and the acquisition frequency p2r of the cold storage power consumption module; The central processing unit marks the adjacent external station ambient temperatures t1 as t1f and t1g, the central processing unit marks the adjacent internal station ambient temperatures t2 as t2f and t2g, the central processing unit marks the adjacent power consumption p1 of the refrigeration units as p1f and p1g, and the central processing unit marks the adjacent power consumption p2 of the cold storage units as p2f and p2g; The central processing unit is based on the formula Calculate the acquisition frequency t1r of the temperature module outside the station, and the central processing unit uses the formula Calculate the acquisition frequency t2r of the temperature module outside the station, and the central processing unit uses the formula Calculate the acquisition frequency p1r of the temperature module outside the station, and the central processing unit uses the formula The collection frequency p2r of the temperature module outside the calculation station can be adjusted. By adjusting the collection frequency r, the amount of collected data can be reduced when the change range is small, reducing the calculation pressure of the central processing unit. When the change range is large, the collection interval time can be reduced, the response speed of the system can be improved, and the execution inertia of the system can be reduced.

[0023] Among them, the central processing unit presets the first protection time of 30 minutes and the second protection time of 1 minute. When any one of the first traffic analysis program and the second traffic analysis program is executed, it will automatically enter the first protection time, and when the third traffic analysis program is executed, it will automatically enter the second protection time.

[0024] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An energy-saving control system for a cold storage refrigeration station, comprising an in-station temperature module, an out-station temperature module, a central processing unit, a refrigeration power consumption module, a cold storage power consumption module and a flow control unit, characterized in that: The external temperature module and the internal temperature module respectively obtain the external ambient temperature t1 and the internal ambient temperature t2 of the refrigeration station and transmit them to the central processing unit. The refrigeration power consumption module and the cold storage power consumption module respectively obtain the power consumption p1 of the refrigeration unit and the power consumption p2 of the cold storage unit and transmit them to the central processing unit. The regional flow module controls the cold storage water flow of each area in the refrigeration station, and the node flow module controls the cold storage water flow of each branch in the cold east station. The central processing unit presets a first cycle, a second cycle, a third cycle, a first change threshold, a second change threshold and a third change threshold. When the change of the ambient temperature t1 outside the station in the first cycle exceeds the first change threshold, the first flow analysis program is executed to obtain the total flow balance point b1, and the total flow balance point b1 is transmitted to all regional flow modules. All regional flow modules adjust their own cold storage water flow. When the change of the ambient temperature t1 outside the station in the second cycle exceeds the second change threshold, the second flow analysis program is executed to obtain the regional flow balance point b2, and the regional flow balance point b2 is transmitted to the corresponding regional flow module. Each regional flow module adjusts its own cold storage water flow. When the change of either the ambient temperature t1 outside the station or the ambient temperature t2 inside the station in the third cycle exceeds the third change threshold, the third flow analysis program is executed to obtain the node flow balance point b3, and the node flow balance point b3 is transmitted to the corresponding node flow module. Each node flow module adjusts its own cold storage water flow.

2. The energy-saving control system for a cold storage refrigeration station according to claim 1, characterized in that: When the first flow analysis program is executed, the central processing unit creates a first curve graph, the abscissa of the first curve graph is time, the ordinate is temperature, and the external environment temperature t1 is input into the first curve graph to obtain a first external environment temperature curve; The central processing unit marks the time point when t1 exceeds the first change threshold as the first trigger point in the first cycle, records the duration T1 from the start of the first cycle to the first trigger point, marks the first external ambient temperature curve within the duration T1 as the first trigger curve, obtains t1 at the start of the first cycle as tc1, and obtains t1 at the first trigger point as tc2; According to the formula Calculate the slope k1 of the first trigger curve, preset the first test interval range1, and use the formula Calculate the value range of the first test interval range1, where w1 and w2 are proportional coefficients; The central processing unit calculates the average flow value of all regional flow modules ,Will The adjustment range is sent to all regional flow modules, and all regional flow modules follow The adjustment range is from low to high to adjust its own cold storage water flow; Each time the regional flow module adjusts its own cold storage water flow, the central processing unit calculates the total power consumption zp of the power consumption p1 of the refrigeration unit and the power consumption p2 of the cold storage unit. When the adjustment range is fully executed, the cold storage water flow corresponding to the minimum value of the total power consumption zp is marked as the total flow balance point b1.

3. The energy-saving control system for a cold storage refrigeration station according to claim 1, characterized in that: When the second flow analysis program is executed, the central processing unit creates a second curve graph, the abscissa of the second curve graph is time, the ordinate is temperature, and the external environment temperature t1 is input into the second curve graph to obtain a second external environment temperature curve; In the second cycle, the time point when t1 exceeds the second change threshold is marked as the second trigger point, the duration T2 from the start of the second cycle to the second trigger point is recorded, the second external ambient temperature curve within the duration T2 is marked as the second trigger curve, t1 obtained at the start of the second cycle is marked as tc3, and t1 obtained at the first trigger point is marked as tc4; According to the formula Calculate the slope k2 of the second trigger curve, preset the second test interval range2, and use the formula Calculate the value range of the second test interval range2, where w3 and w4 are proportional coefficients; Will The adjustment range is sent to each regional flow module, and each regional flow module follows The adjustment range is from low to high to adjust its own cold storage water flow; Each regional flow module adjusts its own cold storage water flow rate once, calculates the total power consumption qp of the power consumption p1 of the refrigeration unit and the power consumption p2 of the cold storage unit once, and when all regional flow modules When the adjustment range is fully executed, the cold storage water flow corresponding to the minimum value of the total power consumption qp of each regional flow module is marked as the regional flow balance point b2.

4. The energy-saving control system for a cold storage refrigeration station according to claim 1, characterized in that: When the third flow analysis program is executed, a third curve graph is established, the abscissa of the third curve graph is time, and the ordinate is temperature. The external environment temperature t1 and the internal environment temperature t2 are input into the third curve graph to obtain the third external environment temperature curve and the internal environment temperature curve; If the third flow analysis program is triggered by a change in the ambient temperature t1 outside the station, the external analysis process is executed; if the third flow analysis program is triggered by a change in the ambient temperature t2 inside the station, the internal analysis process is executed; When the off-site analysis process is executed, the time point when t1 exceeds the third change threshold in the third cycle is marked as the third trigger point, the duration T3a from the start of the third cycle to the third trigger point is recorded, the third off-site ambient temperature curve within the duration T3a is marked as the third trigger curve, t1 at the start of the third cycle is obtained as tc5, and t1 at the third trigger point is obtained as tc6; According to the formula Calculate the slope k3 of the third trigger curve, preset the third test interval range3, and use the formula Calculate the value range of the third test interval range3, where w5 and w6 are proportional coefficients, and w5 and w6 satisfy the condition w5+w6=0.36; Will The adjustment range is sent to each regional flow module, and the regional flow module will The adjustment range is sent to each node flow module, and each node flow module follows The adjustment range is from low to high to adjust its own cold storage water flow; Each node flow module adjusts its own cold storage water flow each time, and calculates the total power consumption jpa of the power consumption p1 of the refrigeration unit and the power consumption p2 of the cold storage unit. When the adjustment range is fully executed, the cold storage water flow corresponding to the minimum value of the total power consumption jpa of each node flow module is marked as the node flow balance point b3; When the in-station analysis process is executed, the time point when t2 exceeds the third change threshold in the third cycle is marked as the fourth trigger point, the duration T3b from the start of the third cycle to the fourth trigger point is recorded, the in-station ambient temperature curve within the duration T3b is marked as the fourth trigger curve, t2 at the start of the third cycle is obtained as tc7, and t2 at the fourth trigger point is obtained as tc8; According to the formula Calculate the slope k4 of the fourth trigger curve, preset the fourth test range range4, and use the formula Calculate the value range of the fourth test interval range4, where w7 and w8 are proportional coefficients; Will The adjustment range is sent to each regional flow module, and the regional flow module will The adjustment range is sent to each node flow module, and each node flow module follows The adjustment range is from low to high to adjust its own cold storage water flow; Each node flow module adjusts its own cold storage water flow each time, and calculates the total power consumption jpb of the power consumption p1 of the refrigeration unit and the power consumption p2 of the cold storage unit. When the adjustment range is fully executed, the cold storage water flow corresponding to the minimum value of the total power consumption jpb of each node flow module is marked as the node flow balance point b3.

5. The energy-saving control system for a cold storage refrigeration station according to claim 1, characterized in that: The acquisition frequency r includes the acquisition frequency t1r of the external temperature module, the acquisition frequency t2r of the internal temperature module, the acquisition frequency p1r of the refrigeration power consumption module, and the acquisition frequency p2r of the cold storage power consumption module; The front and back adjacent t1 are marked as t1f and t1g respectively, the front and back adjacent t2 are marked as t2f and t2g respectively, the front and back adjacent p1 are marked as p1f and p1g respectively, and the front and back adjacent p2 are marked as p2f and p2g respectively; The central processing unit is based on the formula Calculate the acquisition frequency t1r of the external temperature module according to the formula Calculate the acquisition frequency t2r of the external temperature module according to the formula Calculate the acquisition frequency p1r of the external temperature module according to the formula Calculate the acquisition frequency p2r of the temperature module outside the station.

6. The energy-saving control system for a cold storage refrigeration station according to claim 1, characterized in that: The central processing unit presets a first protection time and a second protection time. When any one of the first flow analysis program and the second flow analysis program is executed, the first protection time is automatically entered, and when the third flow analysis program is executed, the second protection time is automatically entered.

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