Refrigeration system and control method thereof

Abstract

The application discloses a refrigeration system and a control method thereof, and belongs to the technical field of refrigeration systems. The refrigeration system comprises an energy-saving control device, wherein the energy-saving control device is connected with at least one cold machine, a frequency conversion cabinet used for controlling operation parameters of the cold machine, and at least one electric meter used for detecting electric parameters of the cold machine. The control method of the refrigeration system comprises the following steps: detecting electric parameters of the cold machine when the refrigeration system is running; calculating a power consumption proportion of a cooling tower in the cold machine according to the electric parameters, and judging a threshold interval where the power consumption proportion of the cooling tower is located; and adjusting an operation state of the cooling tower according to the threshold interval where the power consumption proportion of the cooling tower is located. Compared with the prior art, the application can guarantee the required cooling effect of the cold machine by calculating the power consumption proportion of the cooling tower according to the electric parameters and adjusting the operation parameters of the cooling tower according to the power consumption proportion.

Description

Technical Field

[0001] This invention relates to the field of refrigeration, and in particular to a refrigeration system and its control method. Background Technology

[0002] The high-efficiency computer room group control system generally adopts the method of frequency regulation and number of operating cooling tower groups in the water system to control the target temperature of cooling return water based on the outdoor wet-bulb temperature plus the target value of the approximation deviation. That is, when the cold water return temperature is greater than the target temperature, the cooling tower fan frequency is increased through the PID algorithm.

[0003] When the cold water return temperature is lower than the target temperature, the cooling tower fan frequency is reduced using a PID algorithm.

[0004] When the frequency of the cooling tower reaches the frequency required to add more cooling towers, then turn on another cooling tower fan.

[0005] When the cooling tower fan reaches the tower reduction frequency, one cooling tower fan is shut down.

[0006] This method has the following problems:

[0007] ① The installation location and method of outdoor temperature and humidity sensors can lead to inaccurate detection.

[0008] Outdoor temperature and humidity sensors are prone to measurement deviations after being installed outdoors.

[0009] The above two issues lead to inaccurate outdoor wet-bulb temperature measurements, affecting the frequency regulation and number control of cooling towers.

[0010] ②The target value for the approximation deviation is set manually and needs to be adjusted periodically according to changes in the chiller's load and climate.

[0011] However, the target value for the approximation deviation is determined solely by human experience and cannot be precisely adjusted.

[0012] Due to the aforementioned issues, the cooling effect of the high-efficiency chiller units in the computer room does not reach the ideal state, resulting in a situation where "either the cooling tower group consumes more electricity to save the unit's electricity, or the cooling tower group saves electricity but causes the unit to consume more electricity," making it impossible for the overall energy efficiency ratio of the chiller + cooling tower group to be within the high-efficiency range.

[0013] Therefore, how to design a refrigeration system and its control method that can eliminate the influence of room temperature and humidity sensors and manual intervention on the cooling tower control, and ensure the cooling effect required by the chiller, is a technical problem that the industry urgently needs to solve. Summary of the Invention

[0014] To address the problem of unsatisfactory cooling performance in existing technologies, this invention proposes a cooling system and its control method.

[0015] The technical solution of this invention is to propose a control method for a refrigeration system. The refrigeration system includes an energy-saving control device, which is connected to at least one chiller, a frequency converter cabinet for controlling the operating parameters of the chiller, and at least one electricity meter for detecting the electrical parameters of the chiller. The control method for the refrigeration system includes:

[0016] During the operation of the refrigeration system, the electrical parameters of the chiller are detected;

[0017] Calculate the power consumption ratio of the cooling tower in the chiller based on the power consumption parameters, and determine the threshold range in which the power consumption ratio of the cooling tower is located;

[0018] The operating status of the cooling tower is adjusted according to the threshold range in which the power consumption ratio of the cooling tower falls.

[0019] Furthermore, the electrical parameters of the chiller include: the total power consumption of the chiller and the total power consumption of the cooling tower in the chiller;

[0020] The power consumption ratio of the cooling tower satisfies the calculation model:

[0021] Q = (Pa / Pb) * 100%

[0022] Where Q is the power consumption ratio of the cooling tower, Pa is the total power consumption of the cooling tower in the chiller, and Pb is the total power consumption of the chiller.

[0023] Furthermore, the threshold range is set according to the target power consumption ratio of the cooling tower, and when the power consumption ratio of the cooling tower is greater than the upper limit of the target power consumption ratio, it is determined that the power consumption ratio of the cooling tower is in the first threshold range.

[0024] When the power consumption ratio of the cooling tower is less than the lower limit of the target power consumption ratio, it is determined that the power consumption ratio of the cooling tower is in the second threshold range.

[0025] Furthermore, the operating parameters of the cooling tower are adjusted according to the threshold range in which the power consumption ratio of the cooling tower falls, including:

[0026] When the power consumption ratio of the cooling tower is within the first threshold range, it is determined whether the current operating frequency of the cooling tower is greater than the lower limit of the operating frequency.

[0027] If so, then frequency reduction control is performed on the cooling tower.

[0028] Furthermore, the operating parameters of the cooling tower are adjusted according to the threshold range in which the power consumption ratio of the cooling tower falls, including:

[0029] When the power consumption ratio of the cooling tower is within the second threshold range, it is determined whether the current operating frequency of the cooling tower is less than the upper limit of the operating frequency.

[0030] If so, then frequency increase control is performed on the cooling tower.

[0031] Furthermore, the control method for the refrigeration system also includes:

[0032] Detect the first operating parameter of the refrigeration system;

[0033] Calculate the target energy consumption ratio correction value based on the first operating parameter;

[0034] The target energy consumption percentage is reset based on the target energy consumption percentage correction value.

[0035] Furthermore, the first operating parameters include: the type of the chiller, the type of the motor of the cooling tower, and the temperature of the cooling water inlet.

[0036] Furthermore, the control method for the refrigeration system also includes:

[0037] Detect the second operating parameter of the refrigeration system;

[0038] Calculate the target number of operating cooling towers based on the second operating parameters;

[0039] The number of operating cooling towers is controlled to the target value for the number of operating cooling towers.

[0040] Furthermore, the second operating parameters include: the number of cooling towers that can be automatically operated, the type of motor of the cooling tower, the number of operating chillers, the percentage of operating current of the chillers, and the cooling water inlet temperature.

[0041] The present invention also proposes a refrigeration system, the refrigeration system including an energy-saving control device, the energy-saving control device being connected to: at least one chiller, a frequency converter cabinet for controlling the operating parameters of the chiller, and at least one electricity meter for detecting the electrical parameters of the chiller;

[0042] When the refrigeration system is running, the electricity meter detects the power consumption parameters of the refrigeration unit;

[0043] The energy-saving control device calculates the power consumption ratio of the cooling tower in the chiller based on the power consumption parameters, and determines the threshold range in which the power consumption ratio of the cooling tower is located.

[0044] The frequency converter adjusts the operating parameters of the cooling tower according to the threshold range in which the power consumption ratio of the cooling tower falls.

[0045] Compared with the prior art, the present invention has at least the following beneficial effects:

[0046] This invention detects the power consumption parameters of the chiller, calculates the power consumption ratio of the cooling tower, and adjusts its operating parameters based on this ratio. This allows the cooling tower's operating status to be adjusted according to its power consumption duty cycle, ensuring the required cooling effect for the chiller. Furthermore, the target energy consumption ratio and the number of operating cooling towers are set based on actual operating parameters, automatically correcting these values ​​at regular intervals, eliminating the problem of inaccurate adjustments caused by manual intervention. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 This is a diagram of the architecture of the refrigeration system proposed in this invention;

[0049] Figure 2 This is a flowchart illustrating the adjustment of the cooling tower's operating status according to the present invention;

[0050] Figure 3 This is a flowchart illustrating the process of obtaining the target energy consumption ratio correction value in this invention;

[0051] Figure 4 This is a flowchart for obtaining the target number of operating cooling towers in this invention. Detailed Implementation

[0052] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0053] Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of the invention, and does not imply that every embodiment of the invention must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0054] The principles and structure of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0055] Existing control methods for refrigeration systems have the following problems:

[0056] ① The installation location and method of outdoor temperature and humidity sensors can lead to inaccurate detection.

[0057] Outdoor temperature and humidity sensors are prone to measurement deviations after being installed outdoors.

[0058] The above two issues lead to inaccurate outdoor wet-bulb temperature measurements, affecting the frequency regulation and number control of cooling towers.

[0059] ②The target value for the approximation deviation is set manually and needs to be adjusted periodically according to changes in the chiller's load and climate.

[0060] However, the target value for the approximation deviation is determined solely by human experience and cannot be precisely adjusted.

[0061] Due to the aforementioned issues, the cooling effect of the high-efficiency chiller units in the computer room does not reach the ideal state, resulting in a situation where "either the cooling tower group consumes more electricity to save the unit's electricity, or the cooling tower group saves electricity but causes the unit to consume more electricity," making it impossible for the overall energy efficiency ratio of the chiller + cooling tower group to be within the high-efficiency range.

[0062] To address the above problems, this invention proposes a control method for a refrigeration system, which includes the following steps:

[0063] During the operation of the refrigeration system, monitor the electrical parameters of the chiller;

[0064] Calculate the power consumption ratio of the cooling tower in the chiller based on the power consumption parameters, and determine the threshold range in which the power consumption ratio of the cooling tower falls.

[0065] Adjust the operating status of the cooling tower according to the threshold range in which the power consumption of the cooling tower falls.

[0066] As can be seen from the above control method, the operating state of the cooler in this invention is adjusted according to its power consumption ratio, which can fully guarantee the cooling effect of the cooler according to the actual situation and solve the problem of unsatisfactory cooling effect in the prior art.

[0067] The refrigeration system proposed in this invention includes an energy-saving control device, which is connected to at least one chiller, a frequency converter cabinet for controlling the operating parameters of the chiller, and at least one electricity meter for detecting the electrical parameters of the chiller.

[0068] Here, "refrigeration unit" refers to the unit used for refrigeration in a refrigeration system, which may include cooling towers and refrigeration main units.

[0069] Please see Figure 1In a preferred embodiment of the present invention, the aforementioned electricity meters include a "cooling tower electricity meter" and a "refrigeration unit electricity meter." Here, the "cooling tower electricity meter" is mainly used to detect the power consumption parameters of the cooling tower, and the "refrigeration unit electricity meter" is mainly used to detect the power consumption parameters of the chiller. Both the "cooling tower electricity meter" and the "refrigeration unit electricity meter" communicate with the "cooling tower energy-saving control device" via the Modbus protocol to transmit the aforementioned power consumption parameters.

[0070] Here, "cooling tower energy-saving control device" is the same as "energy-saving control device" mentioned earlier, and "cooling tower frequency converter cabinet" is the same as "frequency converter cabinet" mentioned earlier;

[0071] From the appendix Figure 1 It can also be seen that the "cooling tower energy-saving control device" is also connected to the "refrigeration unit", and the "cooling tower energy-saving control device" can obtain the operating parameters of the "refrigeration unit" through the Modbus protocol;

[0072] Meanwhile, the "cooling tower frequency converter cabinet" is connected to the "cooling tower" and the "refrigeration unit" respectively, and can be used to adjust the operating parameters of the "cooling tower" and the "refrigeration unit", that is, the operating frequency. At the same time, the "cooling tower energy-saving control device" controls the "cooling tower frequency converter cabinet" through "IO control".

[0073] Based on the above-mentioned refrigeration system, in this invention, when the refrigeration system is running, the power consumption parameters of the chiller can be detected by the above-mentioned "cooling tower power meter" and "refrigeration unit power meter";

[0074] Then, the "cooling tower energy-saving control device" calculates the power consumption ratio of the cooling tower in the chiller based on the power consumption parameters, and determines the threshold range in which the power consumption ratio of the cooling tower is located.

[0075] Finally, the operating parameters of the cooling tower are adjusted by the "cooling tower frequency converter cabinet" according to the threshold range of the cooling tower's power consumption ratio.

[0076] Furthermore, the electrical parameters of the chiller in the control method of the above-mentioned refrigeration system include: the total power consumption of the chiller and the total power consumption of the cooling tower in the chiller;

[0077] The power consumption ratio of the cooling tower satisfies the calculation model:

[0078] Q = (Pa / Pb) * 100%

[0079] Where Q is the power consumption percentage of the cooling tower, Pa is the total power consumption of the cooling tower in the chiller, and Pb is the total power consumption of the chiller.

[0080] In the control method of the above-mentioned refrigeration system, the threshold range is set according to the target power consumption ratio of the cooling tower, and its specific settings are as follows:

[0081] When the power consumption ratio of the cooling tower is greater than the upper limit of the target power consumption ratio, the power consumption ratio of the cooling tower is determined to be in the first threshold range.

[0082] When the power consumption ratio of the cooling tower is less than the lower limit of the target power consumption ratio, the power consumption ratio of the cooling tower is determined to be in the second threshold range.

[0083] After determining the threshold range in which the power consumption ratio of the cooling tower falls, the operating parameters of the cooling tower can be adjusted according to this threshold range. This includes the following steps:

[0084] When the power consumption ratio of the cooling tower is within the first threshold range, determine whether the current operating frequency of the cooling tower is greater than the lower limit of the operating frequency.

[0085] If so, then frequency reduction control will be applied to the cooling tower.

[0086] When the power consumption ratio of the cooling tower is in the second threshold range, determine whether the current operating frequency of the cooling tower is less than the upper limit of the operating frequency.

[0087] If so, then frequency increase control will be applied to the cooling tower.

[0088] The above process is the process of adjusting the operating status of the cooling tower in this invention. In practical applications, when judging the threshold range of the power consumption ratio of the cooling tower, the dead zone also needs to be considered. That is, the judgment condition of the first threshold range is: the power consumption ratio of the cooling tower is greater than the sum of the upper limit of the target power consumption ratio and the dead zone.

[0089] The condition for determining the second threshold interval is: the power consumption ratio of the cooling tower is less than the difference between the lower limit of the target power consumption ratio and the dead zone.

[0090] Here, the upper limit of the target power consumption percentage ranges from 5% to 10%, the lower limit of the target power consumption percentage ranges from 2% to 5%, and the dead zone ranges from 0% to 1%, with a typical value of 0.5%.

[0091] The present invention, through the above-mentioned adjustment scheme, can control the operating frequency of the cooling tower within a reasonable range. The operating frequency of the cooling tower corresponds to its cooling capacity. If the operating frequency of the cooling tower is too high, there may be a problem of energy consumption of the chiller. If the operating frequency is too low, it may not be able to meet the cooling effect required by the chiller.

[0092] Please see Figure 2 This is a flowchart of the above-mentioned cooling tower operation status adjustment, which includes the following steps:

[0093] "Is the chiller compressor running?" corresponds to the earlier statement "While the refrigeration system is running, check the chiller's electrical parameters." The process of checking the chiller's electrical parameters is as follows: Figure 2The reason not mentioned is that when the compressor of the chiller is running, the "cooling tower electricity meter" and "refrigeration unit electricity meter" are automatically started to detect the power parameters of the chiller.

[0094] “Calculate: Cooling tower power consumption ratio = (total power consumption of cooling tower / total power consumption of chiller) * 100%”, which corresponds to “calculate the power consumption ratio of cooling tower in chiller based on power parameters” in the previous text. The specific calculation model is Q = (Pa / Pb) * 100% in the previous text.

[0095] The criteria of "cooling tower power consumption percentage > upper limit target value + dead zone" and "cooling tower power consumption percentage < lower limit target value - dead zone" are also known as the "threshold range for determining the power consumption percentage of the cooling tower" mentioned earlier. Figure 2 The "upper limit target value" mentioned earlier is the same as the "upper limit of the target energy consumption ratio" mentioned earlier, and the "lower limit target value" is the same as the "lower limit of the target energy consumption ratio" mentioned earlier, which is also the appendix. Figure 2 When the condition "cooling tower power consumption ratio > upper limit target value + dead zone" is met, the power consumption ratio of the cooling tower is determined to be in the first threshold range.

[0096] When "cooling tower power consumption ratio < lower limit target value - dead zone" is determined to be true, the power consumption ratio of the cooling tower is determined to be in the second threshold range.

[0097] Appendix Figure 2 The terms "Current frequency > lower frequency limit?" and "Cooling tower frequency reduction" refer to the previous statement: "Determine whether the current operating frequency of the cooling tower is greater than the lower operating frequency limit. If so, then perform frequency reduction control on the cooling tower."

[0098] Appendix Figure 2 The terms "Current frequency < upper limit of frequency?" and "Frequency boosting of cooling tower" are equivalent to "Determine whether the current operating frequency of the cooling tower is less than the upper limit of the operating frequency. If so, then perform frequency boosting control on the cooling tower."

[0099] The above process is the process of adjusting the operating status of the cooling tower in this invention. It can be seen that by detecting the power consumption parameters of the chiller, calculating the power consumption ratio of the cooling tower, and adjusting its operating parameters according to the power consumption ratio of the cooling tower, the operating parameters of the cooling tower can be adjusted according to the power consumption duty cycle of the cooling tower, so as to fully guarantee the cooling effect required by the chiller.

[0100] Furthermore, the present invention has made corresponding corrections and adjustments to the target energy consumption ratio, which specifically include the following steps:

[0101] Detect the first operating parameters of the refrigeration system;

[0102] Calculate the target energy consumption ratio correction value based on the first operating parameter;

[0103] The target energy consumption percentage is reset based on the target energy consumption percentage correction value.

[0104] The first operating parameters mentioned above include: the type of chiller, the type of motor in the cooling tower, and the temperature of the cooling water inlet.

[0105] The aforementioned target energy consumption ratio is adjusted accordingly based on the first operating parameter and is automatically adjusted at specific intervals, which can eliminate the problem of inaccurate adjustment caused by manual intervention.

[0106] Here, the time interval for each automatic correction is set to 15 to 120 minutes.

[0107] The calculation model for resetting the target energy consumption ratio based on the target energy consumption ratio correction value is as follows:

[0108] Target energy consumption ratio upper limit (corrected) = Target energy consumption ratio upper limit (current value) + Target energy consumption ratio correction value;

[0109] The target energy consumption ratio lower limit (corrected) = the target energy consumption ratio lower limit (current value) + the target energy consumption ratio correction value.

[0110] Please see Figure 3 In this invention, the first operating parameter mentioned above is also the input parameter input to the correction value comparison function and the database, which includes: the type of chiller, the type of motor of the cooling tower, and the temperature of the cooling water inlet.

[0111] Specifically, the types of chillers mentioned above include: fixed-frequency centrifuges, magnetic levitation centrifuges, permanent magnet synchronous variable frequency centrifuges, air-suspended centrifuges, fixed-frequency screw chillers, and permanent magnet synchronous variable frequency screw chillers;

[0112] The types of motors used in the aforementioned cooling towers include: three-phase asynchronous motors and permanent magnet synchronous motors;

[0113] The temperatures of the aforementioned cooling water inlet include: below 20.0℃, 20.0℃~21.9℃, 22.0℃~23.9℃, 24.0℃~25.9℃, 26.0℃~27.9℃, 28.0℃~29.9℃, 30.0℃~31.9℃, and above 32.0℃.

[0114] The aforementioned "correction value comparison function and database" is derived from multiple experiments. After inputting the first operating parameter, it can output the "correction value of the energy consumption ratio target value".

[0115] The “target energy consumption ratio correction value” here is the same as the “target energy consumption ratio correction value” mentioned above. After obtaining the “target energy consumption ratio correction value”, the current target energy consumption ratio can be corrected according to the “target energy consumption ratio correction value” to adjust the operating status of the cooling tower.

[0116] Furthermore, this invention also includes corresponding modifications and adjustments to the number of operating cooling towers, specifically comprising the following steps:

[0117] Detect the second operating parameter of the refrigeration system;

[0118] Calculate the target number of operating cooling towers based on the second operating parameter;

[0119] The number of operating cooling towers is controlled to be the target value for the number of operating cooling towers.

[0120] The second operating parameters mentioned above include: the number of cooling towers that can be automatically operated, the type of motor for the cooling towers, the number of chillers in operation, the percentage of chiller operating current, and the cooling water inlet temperature.

[0121] The target number of operating cooling towers is adjusted accordingly based on the second operating parameter and is automatically adjusted at specific intervals, which can eliminate the problem of inaccurate adjustment caused by manual intervention.

[0122] Here, the time interval for each automatic correction is set to 5 to 30 minutes.

[0123] Please see Figure 4 In this invention, the second operating parameter mentioned above is also the input parameter to the cooling tower operating number comparison function and the database, which includes: the number of cooling towers that can be automatically operated, the motor type of the cooling tower, the number of chillers in operation, the percentage of chiller operating current, and the cooling water inlet temperature.

[0124] The range of the number of automatically operating and available numbers for the aforementioned cooling towers is 0 to 30.

[0125] The types of motors used in the aforementioned cooling towers include: three-phase asynchronous motors and permanent magnet synchronous motors;

[0126] The number of operating chillers ranges from 0 to 10.

[0127] The percentage of operating current for the above-mentioned chillers includes: below 20.0%, 20.0℃~29.9%, 30.0℃~39.9%, 40.0℃~49.9%, 50.0℃~59.9%, 60.0℃~69.9%, 70.0℃~79.9%, 80.0℃~89.9%, and 90.0℃~100%.

[0128] The aforementioned cooling water inlet temperatures include: below 20.0℃, 20.0℃~21.9℃, 22.0℃~23.9℃, 24.0℃~25.9℃, 26.0℃~27.9℃, 28.0℃~29.9℃, 30.0℃~31.9℃, and above 32.0℃.

[0129] The above-mentioned "cooling tower operating number comparison function and database" is derived from multiple experiments. After inputting the above-mentioned second operating parameter, the "target value of cooling tower operating number" can be output.

[0130] After obtaining the "target value of the number of operating cooling towers" through the aforementioned "cooling tower operating unit comparison function and database", this invention can set the number of operating cooling towers according to the "target value of the number of operating cooling towers" to meet the cooling effect required by the chiller.

[0131] In other words, the target energy consumption ratio and the number of operating cooling towers in this invention are set according to the actual operating parameters, and the target values ​​of the target energy consumption ratio and the number of operating cooling towers can be automatically corrected at specific times, eliminating the problem of inaccurate adjustment caused by manual intervention.

[0132] Based on the above-mentioned control method for the refrigeration system, the present invention proposes a refrigeration system, which includes an energy-saving control device. The energy-saving control device is connected to: at least one chiller, a frequency converter cabinet for controlling the operating parameters of the chiller, and at least one electricity meter for detecting the electrical parameters of the chiller.

[0133] When the refrigeration system is running, the electricity meter detects the power consumption parameters of the chiller;

[0134] The energy-saving control device calculates the power consumption ratio of the cooling tower in the chiller based on the power consumption parameters, and determines the threshold range in which the power consumption ratio of the cooling tower is located.

[0135] The frequency converter adjusts the operating parameters of the cooling tower according to the threshold range in which the power consumption of the cooling tower is located.

[0136] In summary, compared with the prior art, the present invention has at least the following beneficial effects:

[0137] This invention detects the power consumption parameters of the chiller, calculates the power consumption ratio of the cooling tower, and adjusts its operating parameters based on this ratio. This allows the cooling tower's operating status to be adjusted according to its power consumption duty cycle, ensuring the required cooling effect for the chiller. Furthermore, the target energy consumption ratio and the number of operating cooling towers are set based on actual operating parameters, automatically correcting these values ​​at regular intervals, eliminating the problem of inaccurate adjustments caused by manual intervention.

[0138] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A control method for a refrigeration system, the refrigeration system comprising an energy-saving control device, the energy-saving control device being connected to: at least one chiller, a frequency converter cabinet for controlling the operating parameters of the chiller, and at least one electricity meter for detecting the electrical parameters of the chiller, characterized in that, The control method for the refrigeration system includes: During the operation of the refrigeration system, the electrical parameters of the chiller are detected; Calculate the power consumption ratio of the cooling tower in the chiller based on the power consumption parameters, and determine the threshold range in which the power consumption ratio of the cooling tower is located; The operating status of the cooling tower is adjusted according to the threshold range in which the power consumption ratio of the cooling tower falls; The power consumption parameters of the chiller include: the total power consumption of the chiller and the total power consumption of the cooling tower in the chiller; The power consumption ratio of the cooling tower satisfies the calculation model: Q = (Pa / Pb) * 100% Where Q is the power consumption ratio of the cooling tower, Pa is the total power consumption of the cooling tower in the chiller, and Pb is the total power consumption of the chiller. The threshold range is set according to the target power consumption ratio of the cooling tower, and when the power consumption ratio of the cooling tower is greater than the sum of the upper limit of the target power consumption ratio and the preset dead zone, it is determined that the power consumption ratio of the cooling tower is in the first threshold range. When the power consumption ratio of the cooling tower is less than the difference between the lower limit of the target power consumption ratio and the preset dead zone, it is determined that the power consumption ratio of the cooling tower is in the second threshold range. Adjusting the operating parameters of the cooling tower according to the threshold range in which the power consumption ratio of the cooling tower falls, including: When the power consumption ratio of the cooling tower is within the first threshold range, it is determined whether the current operating frequency of the cooling tower is greater than the lower limit of the operating frequency. If so, then frequency reduction control is performed on the cooling tower; Adjusting the operating parameters of the cooling tower according to the threshold range in which the power consumption ratio of the cooling tower falls, including: When the power consumption ratio of the cooling tower is within the second threshold range, it is determined whether the current operating frequency of the cooling tower is less than the upper limit of the operating frequency. If so, then frequency increase control is performed on the cooling tower.

2. The control method for the refrigeration system according to claim 1, characterized in that, The control method for the refrigeration system further includes: Detect the first operating parameter of the refrigeration system; Calculate the target energy consumption ratio correction value based on the first operating parameter; The target energy consumption percentage is reset based on the target energy consumption percentage correction value.

3. The control method for the refrigeration system according to claim 2, characterized in that, The first operating parameters include: the type of the chiller, the type of the motor of the cooling tower, and the temperature of the cooling water inlet.

4. The control method for the refrigeration system according to claim 1, characterized in that, The control method for the refrigeration system further includes: Detect the second operating parameter of the refrigeration system; Calculate the target number of operating cooling towers based on the second operating parameters; The number of operating cooling towers is controlled to the target value for the number of operating cooling towers.

5. The control method for the refrigeration system according to claim 4, characterized in that, The second operating parameters include: the number of cooling towers that can be automatically operated, the type of motor for the cooling towers, the number of chillers in operation, the percentage of operating current for the chillers, and the cooling water inlet temperature.

6. A refrigeration system, characterized in that, The refrigeration system includes an energy-saving control device, which is connected to: at least one chiller, a frequency converter cabinet for controlling the operating parameters of the chiller, and at least one electricity meter for detecting the electrical parameters of the chiller. When the refrigeration system is running, the electricity meter detects the power consumption parameters of the refrigeration unit; The energy-saving control device calculates the power consumption ratio of the cooling tower in the chiller based on the power consumption parameters, and determines the threshold range in which the power consumption ratio of the cooling tower is located. The frequency converter cabinet adjusts the operating status of the cooling tower according to the threshold range in which the power consumption ratio of the cooling tower is located; The power consumption parameters of the chiller include: the total power consumption of the chiller and the total power consumption of the cooling tower in the chiller; The power consumption ratio of the cooling tower satisfies the calculation model: Q = (Pa / Pb) * 100% Where Q is the power consumption ratio of the cooling tower, Pa is the total power consumption of the cooling tower in the chiller, and Pb is the total power consumption of the chiller. The threshold range is set according to the target power consumption ratio of the cooling tower, and when the power consumption ratio of the cooling tower is greater than the sum of the upper limit of the target power consumption ratio and the preset dead zone, it is determined that the power consumption ratio of the cooling tower is in the first threshold range. When the power consumption ratio of the cooling tower is less than the difference between the lower limit of the target power consumption ratio and the preset dead zone, it is determined that the power consumption ratio of the cooling tower is in the second threshold range. Adjusting the operating parameters of the cooling tower according to the threshold range in which the power consumption ratio of the cooling tower falls, including: When the power consumption ratio of the cooling tower is within the first threshold range, it is determined whether the current operating frequency of the cooling tower is greater than the lower limit of the operating frequency. If so, then frequency reduction control is performed on the cooling tower; Adjusting the operating parameters of the cooling tower according to the threshold range in which the power consumption ratio of the cooling tower falls, including: When the power consumption ratio of the cooling tower is within the second threshold range, it is determined whether the current operating frequency of the cooling tower is less than the upper limit of the operating frequency. If so, then frequency increase control is performed on the cooling tower.

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