Control method of energy storage water chilling unit, electronic equipment, system and readable medium

Abstract

The invention discloses a control method of an energy storage water chilling unit, electronic equipment, a system and a readable medium. A water outlet temperature sensor is arranged in a water outlet pipeline, and a water return temperature sensor is arranged in a water return pipeline; under the condition that the energy storage water chilling unit is controlled to be in a starting control stage and a preset starting control period is reached, a target algorithm is determined from a first preset algorithm and a second preset algorithm according to the current environment temperature, the current water outlet temperature, the current water return temperature and the current condensation temperature of the starting control period; determining a first target exhaust temperature according to a target algorithm; adjusting a return water temperature correction coefficient in a second preset algorithm according to the current return water temperature of the operation control period and the return water temperature before the first preset duration under the condition that the energy storage water chilling unit is controlled to be in the operation control stage and the preset operation control period is reached; and a second target exhaust temperature is determined according to the adjusted second preset algorithm. And the safety, the stability and the control effect are obviously improved.

Description

Technical Field

[0001] The present application relates to the technical field of cooling control, and specifically, to a control method, an electronic device, a system and a readable medium for an energy storage chiller. Background Art

[0002] Energy storage chillers often perform control based on battery temperature to achieve heating or cooling. During the control process, if the battery temperature fluctuates greatly and the control is not timely, it will lead to too high battery temperature and slow cooling rate, thus bringing certain risks. And when the battery temperature needs to be heated, if the compressor frequency is not adjusted in time or the water heating is not turned on in time, it will lead to slow battery preheating. Therefore, the control technology effect of the energy storage chiller cooperating with battery thermal management is poor, and it cannot well adapt to the heat load changes during battery charging and discharging, cannot intelligently and timely adjust the compressor frequency and water pump frequency, and cannot meet the temperature requirements and temperature difference requirements of the battery.

[0003] Currently, an energy storage chiller that usually uses a calculated target exhaust temperature to control an electronic expansion valve is commonly used. As a heat pump system, the actual exhaust temperature of this energy storage chiller is mainly related to the compressor frequency, the condensation temperature and the evaporation temperature. Therefore, the target exhaust temperature is also calculated based on these three parameters of the compressor frequency, the condensation temperature and the evaporation temperature. The higher the compressor frequency, the higher the target exhaust temperature, and vice versa; the higher the condensation temperature, the higher the target exhaust temperature, and vice versa; the higher the evaporation temperature, the lower the target exhaust temperature, and vice versa, which can achieve more accurate temperature control to a certain extent. However, this control method is extremely likely to cause dangerous situations such as high-pressure protection of the unit or compressor frequency reduction, and has a high power consumption and extremely wastes electricity.

[0004] Therefore, there is an urgent need for a better control method for energy storage chillers. Summary of the Invention

[0005] The present application aims to solve one of the technical problems in the related technologies to a certain extent. For this purpose, the present application provides a control method, an electronic device, a system and a readable medium for an energy storage chiller.

[0006] As the first aspect of the present application, a control method for an energy storage chiller is provided. Among them, between the battery and the air-conditioning plate heat exchanger of the energy storage chiller, a water outlet temperature sensor for detecting the water outlet temperature is arranged in the water outlet pipeline, and a water return temperature sensor for detecting the water return temperature is arranged in the water return pipeline; the method includes:

[0007] When controlling the energy storage chiller in the start control stage and the preset start control period arrives, determine the target algorithm from the first preset algorithm and the second preset algorithm according to the current ambient temperature, outlet water temperature, return water temperature and condensation temperature in this start control period;

[0008] Determine the first target exhaust temperature according to the target algorithm, and control the electronic expansion valve in the energy storage chiller according to the first target exhaust temperature;

[0009] When controlling the energy storage chiller in the operation control stage and the preset operation control period arrives, adjust the return water temperature correction coefficient in the second preset algorithm according to the current return water temperature in this operation control period and the return water temperature before the first preset duration;

[0010] Determine the second target exhaust temperature according to the adjusted second preset algorithm, and control the electronic expansion valve in the energy storage chiller according to the second target exhaust temperature.

[0011] Optionally, the second preset algorithm includes:

[0012] Target exhaust temperature = A × current compressor frequency in this cycle + B + C × (current outlet water temperature in this cycle + Δt) - D × current ambient temperature in this cycle + E; where, △t represents the return water temperature correction coefficient, and A, B, C, D and E represent adjustment parameters. The adjustment parameters A and B are determined according to the current compressor frequency in this cycle, and the adjustment parameters C, D and E are determined according to the current ambient temperature in this cycle.

[0013] Optionally, the method further includes:

[0014] When controlling the energy storage chiller in the start control stage and it is recognized that the preset operation control conditions are met, control the energy storage chiller to enter the operation control stage; where, the preset operation control conditions include any one of the following: the difference between the current condensation temperature and the current outlet water temperature is greater than the first preset correction threshold, the duration of controlling the energy storage chiller in the start control stage exceeds the second preset duration.

[0015] Optionally, the determining the target algorithm from the first preset algorithm and the second preset algorithm according to the current ambient temperature, outlet water temperature, return water temperature and condensation temperature in this start control period includes:

[0016] When the current ambient temperature in the current startup control cycle is less than or equal to the first preset temperature threshold, the current return water temperature in the current startup control cycle is greater than the second preset temperature threshold, and the current condensation temperature in the current startup control cycle is greater than or equal to the current outlet water temperature, the second preset algorithm is used as the target algorithm;

[0017] When the current ambient temperature in the current startup control cycle is less than or equal to the first preset temperature threshold and the current return water temperature in the current startup control cycle is less than or equal to the second preset temperature threshold, when the current ambient temperature in the current startup control cycle is less than or equal to the first preset temperature threshold, the current return water temperature in the current startup control cycle is greater than the second preset temperature threshold and the current condensation temperature in the current startup control cycle is less than the current outlet water temperature, and when the current ambient temperature in the current startup control cycle is greater than the first preset temperature threshold, the first preset algorithm is used as the target algorithm.

[0018] Optionally, adjusting the return water temperature correction coefficient in the second preset algorithm according to the current return water temperature in the current operation control cycle and the return water temperature before the first preset duration includes:

[0019] Determining the current rising rate of the return water temperature according to the current return water temperature in the current operation control cycle and the return water temperature before the first preset duration;

[0020] Adjusting the return water temperature correction coefficient in the second preset algorithm according to the current return water temperature in the current operation control cycle and the rising rate of the return water temperature.

[0021] Optionally, adjusting the return water temperature correction coefficient in the second preset algorithm according to the current return water temperature in the current operation control cycle and the rising rate of the return water temperature includes:

[0022] When the current return water temperature in the current operation control cycle is less than or equal to the third preset temperature threshold, the rising rate of the return water temperature is less than the first temperature difference change threshold, and the return water temperature correction coefficient is less than the first preset correction threshold, increasing the return water temperature correction coefficient by a preset value;

[0023] When the current return water temperature in the current operation control cycle is less than or equal to the third preset temperature threshold, the rising rate of the return water temperature is greater than or equal to the second temperature difference change threshold, and the return water temperature correction coefficient is greater than the second preset correction threshold, decreasing the return water temperature correction coefficient by a preset value;

[0024] When the return water temperature in the current operation control cycle is greater than the third preset temperature threshold, the rising rate of the return water temperature is less than the third temperature difference change threshold, and the return water temperature correction coefficient is less than the first preset correction threshold, increase the return water temperature correction coefficient by a preset value;

[0025] When the return water temperature in the current operation control cycle is greater than the third preset temperature threshold, the rising rate of the return water temperature is greater than the first temperature difference change threshold, and the return water temperature correction coefficient is greater than the second preset correction threshold, decrease the return water temperature correction coefficient by a preset value.

[0026] Optionally, before determining the target algorithm from the first preset algorithm and the second preset algorithm according to the ambient temperature, outlet water temperature, return water temperature, and condensation temperature in the current start control cycle when controlling the energy storage chiller to be in the start control stage and the preset start control cycle arrives, the method further includes:

[0027] When receiving a compressor start instruction, determine the target initial opening according to the current ambient temperature;

[0028] Control the electronic expansion valve to reset and open to the target initial opening;

[0029] Control the water pump in the energy storage chiller to start, and detect the state of the water flow switch in the water path of the water pump;

[0030] When it is detected that the water flow switch is closed for a third preset duration, control the external fan in the energy storage chiller to start;

[0031] When the external fan in the energy storage chiller is controlled to start for a fourth preset duration, control the compressor to start;

[0032] When the electronic expansion valve is controlled to open to the target initial opening for a fifth preset duration, control the energy storage chiller to enter the start control stage.

[0033] As a second aspect of the present application, there is provided an electronic device, where the electronic device includes:

[0034] One or more processors;

[0035] A memory, on which one or more computer programs are stored. When the one or more computer programs are executed by the one or more processors, the one or more processors implement the control method of the energy storage chiller described in the first aspect of the present application.

[0036] As a third aspect of the present application, there is provided an energy storage chilled water system, wherein the energy storage chilled water system includes an energy storage chiller unit and an electronic device according to the second aspect of the present application. Between the battery of the energy storage chiller unit and the air-conditioning plate heat exchanger, an outlet water temperature sensor for detecting the outlet water temperature is provided in the outlet water pipe, and a return water temperature sensor for detecting the return water temperature is provided in the return water pipe.

[0037] As a fourth aspect of the present application, there is provided a computer-readable medium, on which a computer program is stored, wherein when the computer program is executed by a processor, it implements the control method of the energy storage chiller unit described in the first aspect of the present application.

[0038] The control method of the energy storage chiller unit provided by the embodiments of the present application is as follows: between the battery of the energy storage chiller unit and the air-conditioning plate heat exchanger, an outlet water temperature sensor for detecting the outlet water temperature is provided in the outlet water pipe, and a return water temperature sensor for detecting the return water temperature is provided in the return water pipe. When the energy storage chiller unit is in the start control stage and the preset start control period arrives, according to the current ambient temperature, outlet water temperature, return water temperature and condensation temperature in this start control period, a target algorithm is determined from the existing first preset algorithm and the second preset algorithm proposed in the present application. According to the target algorithm, a first target exhaust temperature is determined, and the electronic expansion valve in the energy storage chiller unit is controlled according to the first target exhaust temperature. This not only takes into account the need for rapid heating when the water temperature is low at the start, but also prevents the exhaust high-temperature protection caused by starting with a low ambient temperature and a high water temperature. When the energy storage chiller unit is in the operation control stage and the preset operation control period arrives, according to the current return water temperature in this operation control period and the return water temperature before the first preset duration, the return water temperature correction coefficient in the second preset algorithm is adjusted. According to the adjusted second preset algorithm, a second target exhaust temperature is determined, and the electronic expansion valve in the energy storage chiller unit is controlled according to the second target exhaust temperature. It can also take into account the stability requirements and energy-saving requirements of the entire energy storage chiller unit after the coolant temperature rises. Significantly improves the safety, stability and control effect of the energy storage chiller unit and saves electricity costs. Description of the Drawings

[0039] The present application will be further described below with reference to the drawings:

[0040] Figure 1 It is a flowchart of an implementation manner of the control method of the energy storage chiller unit provided by the embodiments of the present application;

[0041] Figure 2 It is a schematic diagram of an implementation manner of the energy storage chiller unit provided by the embodiments of the present application;

[0042] Figure 3 It is a flowchart of another implementation manner of the control method for an energy storage chiller provided by an embodiment of the present application;

[0043] Figure 4 It is a flowchart of an implementation manner for determining a target algorithm from a first preset algorithm and a second preset algorithm provided by an embodiment of the present application;

[0044] Figure 5 It is a flowchart of an implementation manner for adjusting the return water temperature correction coefficient provided by an embodiment of the present application;

[0045] Figure 6 It is a flowchart of another implementation manner for adjusting the return water temperature correction coefficient provided by an embodiment of the present application;

[0046] Figure 7 It is a flowchart of an implementation manner for starting the initialization operation provided by an embodiment of the present application;

[0047] Figure 8 It is a module diagram of an implementation manner of an electronic device provided by an embodiment of the present application;

[0048] Figure 9 It is a schematic diagram of a computer-readable medium provided by an embodiment of the present application.

[0049] Description of Reference Numerals

[0050] 101: Processor 102: Memory

[0051] 103: I / O Interface 104: Bus Detailed Embodiment

[0052] The embodiments of the present application are described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions from beginning to end. Based on the embodiments in the implementation manners, it is intended to explain the present application and should not be construed as a limitation to the present application.

[0053] As used herein, the phrase "in one embodiment" or "instance" or "example" means that a particular feature, structure, or characteristic described in connection with the embodiment itself may be included in at least one embodiment disclosed in the present application. The appearances of the phrase "in one embodiment" in various positions in the specification do not necessarily refer to the same embodiment.

[0054] Energy storage chillers are often controlled based on battery temperature to achieve heating or cooling. During the control process, if the battery temperature fluctuates greatly and is not controlled in time, the battery temperature will be too high and the cooling rate will be slow, which will bring certain risks. When the battery temperature drops and needs to be heated, if the compressor frequency is not adjusted in time or the water heating is not turned on in time, the battery will warm up slowly. Therefore, the control technology of energy storage chillers combined with battery thermal management is poor, cannot adapt well to the changes in thermal load during battery charging and discharging, cannot intelligently and timely adjust the compressor frequency and water pump frequency, and cannot meet the temperature requirements and temperature difference requirements of the battery.

[0055] At present, a kind of energy storage chiller that calculates the target exhaust temperature to control the electronic expansion valve is usually used. As a heat pump system, the actual exhaust temperature of this energy storage chiller is mainly related to the compressor frequency, condensing temperature and evaporating temperature. Therefore, the target exhaust temperature is also calculated based on the three parameters of compressor frequency, condensing temperature and evaporating temperature. The higher the compressor frequency, the higher the target exhaust temperature, and vice versa; the higher the condensing temperature, the higher the target exhaust temperature, and vice versa; the higher the evaporating temperature, the lower the target exhaust temperature, and vice versa, which can achieve more precise temperature control to a certain extent. However, this control method is very likely to cause dangerous situations such as high-pressure protection of the unit or compressor frequency reduction, and the high power is extremely wasteful of electricity.

[0056] After discovering the drawbacks of the above-mentioned energy storage chiller, the applicant of the present application further discovered that: in the actual application process of the energy storage chiller, considering the cost and reliability of the whole system, in the heating mode, the ambient temperature detected by the sensor is used as the evaporation temperature, and the temperature converted from the high-pressure side pressure detected by the pressure sensor is used as the condensation temperature. In addition, during the operation of the energy storage chiller, especially when heating at low ambient temperatures, due to the low ambient temperature on the evaporation side, the evaporation effect is poor, and the system response speed is slow. If the target exhaust temperature is greater than the actual exhaust temperature, the electronic expansion valve is in a closed state to achieve the purpose of raising the actual exhaust temperature to the target exhaust temperature. However, when the electronic expansion valve is closed, the high-pressure side pressure rises immediately, the target exhaust temperature increases, but the actual exhaust temperature responds with lag, and then the electronic expansion valve continues to close, and the high-pressure side pressure continues to rise. When the electronic expansion valve is closed to a certain degree, the pressure on the high-pressure side rises sharply, eventually causing high-pressure protection of the unit, or causing the compressor to reduce its frequency due to excessive high-pressure pressure; or when the actual exhaust temperature begins to respond, the electronic expansion valve is in a state of too small an opening and has no time to open wide, resulting in a sharp rise in the actual exhaust temperature, causing a series of adverse conditions such as high-temperature exhaust protection; and excessive pressure on the high-pressure side will also cause high power and power consumption of the system.

[0057] Based on the above pioneering discoveries, the applicant of this application proposes to pre-construct a second preset algorithm and switch to use the algorithm from the existing first preset algorithm and the second preset algorithm proposed in this application to calculate the target exhaust temperature during the start-up control stage. This takes into account the need for rapid heating when the water temperature is low at the start, and can also prevent exhaust high-temperature protection when starting with a low ambient temperature and a high water temperature. During the operation control stage, after optimizing the return water temperature correction coefficient in the second preset algorithm and then using it, it can also take into account the stability requirements and energy-saving requirements of the entire energy storage chiller after the coolant temperature rises.

[0058] As a first aspect of the embodiment of this application, a control method for an energy storage chiller is provided. Among them, between the battery and the air-conditioning plate heat exchanger of the energy storage chiller, a water outlet temperature sensor for detecting the water outlet temperature is provided in the water outlet pipe, and a water return temperature sensor for detecting the water return temperature is provided in the water return pipe; as Figure 1 shown, the method may include:

[0059] Step S110, when controlling the energy storage chiller to be in the start-up control stage and the preset start-up control cycle arrives, determine the target algorithm from the first preset algorithm and the second preset algorithm according to the current ambient temperature, water outlet temperature, water return temperature, and condensation temperature in this start-up control cycle;

[0060] Step S120, determine the first target exhaust temperature according to the target algorithm, and control the electronic expansion valve in the energy storage chiller according to the first target exhaust temperature;

[0061] Step S130, when controlling the energy storage chiller to be in the operation control stage and the preset operation control cycle arrives, adjust the return water temperature correction coefficient in the second preset algorithm according to the current water return temperature in this operation control cycle and the water return temperature before the first preset duration;

[0062] Step S140, determine the second target exhaust temperature according to the adjusted second preset algorithm, and control the electronic expansion valve in the energy storage chiller according to the second target exhaust temperature.

[0063] As Figure 2 shown, it is a schematic diagram of an implementation manner of the energy storage chiller provided by the embodiment of this application. The energy storage chiller includes components such as a compressor, a four-way valve, a cold evaporator, an external fan, an electronic expansion valve (auxiliary throttling and main throttling), a flash tank, an air-conditioning plate heat exchanger, and a battery. In the refrigeration cycle, the refrigerant evaporates and absorbs heat in the air-conditioning plate heat exchanger, cools the circulating water, and the circulating water takes away the heat of the battery. In the heating cycle, the refrigerant condenses and releases heat in the air-conditioning plate heat exchanger, heats the circulating water, and the circulating water releases heat to the battery.

[0064] Under normal circumstances, an exhaust temperature sensor and a high-pressure pressure sensor are provided on the pipeline between the compressor and the four-way valve. The exhaust temperature sensor is used to detect the exhaust temperature, and the high-pressure pressure sensor is used to detect the high-pressure side pressure. The high-pressure side pressure detected by the high-pressure pressure sensor is converted into temperature as the condensation temperature. An ambient temperature sensor is provided outside the chassis near the cold evaporator to detect the ambient temperature. The target exhaust temperature is calculated based on the compressor frequency, condensation temperature, and ambient temperature (i.e., the first preset algorithm), and then the electronic expansion valve is controlled. However, this control method is extremely likely to cause dangerous situations such as high-pressure protection of the unit or frequency reduction of the compressor, and the power is relatively high, extremely wasting electricity.

[0065] In the embodiment of the present application, based on the energy storage water chiller, an outlet temperature sensor (i.e., an outlet water temperature sensor) is provided on the outlet water pipeline between the battery and the air-conditioning plate heat exchanger to detect the temperature of the medium flowing to the battery, and a return water temperature sensor is provided on the return water pipeline between the battery and the air-conditioning plate heat exchanger to detect the temperature of the medium returning to the air-conditioning plate heat exchanger. In the start-up control stage, based on the ambient temperature, outlet water temperature, return water temperature, and condensation temperature, a target algorithm is selected from the existing first preset algorithm and the second preset algorithm proposed in the present application to calculate the target exhaust temperature; in the operation control stage, the return water temperature correction coefficient in the second preset algorithm is adjusted according to the return water temperature and the return water temperature before the first preset duration, and the corrected second preset algorithm is used to calculate the target exhaust temperature.

[0066] Among them, the outlet water temperature sensor and the return water temperature sensor usually detect the outlet water temperature and the return water temperature respectively based on a preset temperature detection period. The embodiment of the present application does not specifically limit the duration of the temperature detection period, nor does it specifically limit the duration of the start-up control period and the operation control period. For example, it can be 5 minutes, 8 minutes, etc. The embodiment of the present application does not specifically limit the magnitude relationship between the duration of the start-up control period, the duration of the operation control period, and the duration of the temperature detection period.

[0067] Among them, the first preset duration can be determined according to the temperature detection period of the return water temperature sensor. For example, as an optional implementation manner with relatively high control accuracy, the duration of the temperature detection period of the return water temperature sensor can be directly used as the first preset duration.

[0068] It can be understood that "the current ambient temperature, water outlet temperature, water return temperature, and condensation temperature in the current start control cycle" refers to the ambient temperature, water outlet temperature, water return temperature, and condensation temperature that are newly detected or newly converted when entering the current start control cycle. The same applies to "the current water return temperature in the current operation control cycle", and "the water return temperature before the first preset duration" refers to the water return temperature that is newly detected at this moment before the first preset duration.

[0069] It can be understood that "the first target exhaust temperature" and "the second target exhaust temperature" are used to distinguish the target exhaust temperatures calculated for two control stages, and both are essentially the target exhaust temperature.

[0070] Among them, regarding how to specifically control the electronic expansion valve according to the target exhaust temperature, it is not within the scope of improvement of this application, so it will not be elaborated here.

[0071] The control method of the energy storage chilled water unit provided by the embodiment of this application is as follows: between the battery and the air-conditioning plate heat exchanger of the energy storage chilled water unit, a water outlet temperature sensor for detecting the water outlet temperature is arranged in the water outlet pipeline, and a water return temperature sensor for detecting the water return temperature is arranged in the water return pipeline. When controlling the energy storage chilled water unit to be in the start control stage and the preset start control cycle arrives, according to the current ambient temperature, water outlet temperature, water return temperature, and condensation temperature in the current start control cycle, a target algorithm is determined from the existing first preset algorithm and the second preset algorithm proposed in this application. The first target exhaust temperature is determined according to the target algorithm, and the electronic expansion valve in the energy storage chilled water unit is controlled according to the first target exhaust temperature, which not only takes into account the need for rapid heating when starting with a low water temperature, but also prevents exhaust high-temperature protection when starting with a low ambient temperature and a high water temperature; when controlling the energy storage chilled water unit to be in the operation control stage and the preset operation control cycle arrives, the water return temperature correction coefficient in the second preset algorithm is adjusted according to the current water return temperature in the current operation control cycle and the water return temperature before the first preset duration. The second target exhaust temperature is determined according to the adjusted second preset algorithm, and the electronic expansion valve in the energy storage chilled water unit is controlled according to the second target exhaust temperature, which can also take into account the stability requirement and energy-saving requirement of the entire energy storage chilled water unit after the coolant temperature rises. It significantly improves the safety, stability, and control effect of the energy storage chilled water unit and saves electricity costs.

[0072] Under normal circumstances, the first preset algorithm includes: Target exhaust temperature = A × compressor frequency + B + C × (condensing temperature) - D × ambient temperature + E. The applicant of the present application further proposes that when the energy storage chiller is operating normally, the temperature of the battery being heated is in a continuously stable rising state, the condensing temperature is higher than the outlet water temperature, and the temperature value by which the condensing temperature is higher than the outlet water temperature is within a relatively stable range. Therefore, the outlet water temperature and the return water temperature correction coefficient can be directly used to construct the second preset algorithm, which can improve the accuracy of calculating the target exhaust temperature. Correspondingly, in some embodiments, the second preset algorithm may include:

[0073] Target exhaust temperature = A × the current compressor frequency in this cycle + B + C × (the current outlet water temperature in this cycle + Δt) - D × the current ambient temperature in this cycle + E; where, △t represents the return water temperature correction coefficient, and A, B, C, D, and E represent adjustment parameters. The adjustment parameters A and B are determined according to the current compressor frequency in this cycle, and the adjustment parameters C, D, and E are determined according to the current ambient temperature in this cycle.

[0074] Among them, it can be understood that the "this cycle" mentioned in the second preset algorithm refers to this startup control cycle or this operation control cycle.

[0075] Among them, the embodiments of the present application do not specifically limit the adjustment parameters A, B, C, D, and E, which can be configured according to different models or different scenarios. For example, Table 1 below shows an optional specific selection and configuration method. In Table 1, "frequency" refers to the current compressor frequency in this cycle, and "ambient temperature" refers to the current ambient temperature in this cycle.

[0076] Table 1

[0077] Adjustment parameter Unit Value A1 (Frequency < 45 HZ) ％ 4 A2 (45 ≤ frequency < 60 Hz) ％ 4 A3 (60 ≤ frequency < 75 Hz) ％ 3 A4 (75 ≤ frequency < 90 Hz) ％ 3 A5 (90 ≤ Frequency) ％ 3 B1 (Frequency < 45 HZ) - -3 B2 (45 ≤ frequency < 60 Hz) - 3 B3 (60 ≤ frequency < 75 Hz) - 3 B4 (75 ≤ frequency < 90 Hz) - 4 B5 (90 ≤ Frequency) - 4 C1 (Ambient temperature < -15 °C) ％ 115 C2 (-15 ≤ Ambient temperature < -5 °C) ％ 115 C3 (-5 ≤ ambient temperature < 5°C) ％ 120 C4 (5 ≤ ambient temperature < 15 °C) ％ 120 C5 (15 ≤ Ambient temperature) ％ 120 D1 (Ambient temperature < -15 °C) ％ 15 D2 (-15 ≤ Ambient temperature < -5 °C) ％ 15 D3 (-5 ≤ ambient temperature < 5°C) ％ 15 D4 (5 ≤ ambient temperature < 15 °C) ％ 15 D5 (15 ≤ Ambient temperature) ％ 15 E1 (Ambient temperature < -15 °C) - 25 E2 (-15 ≤ Ambient temperature < -5 °C) - 22 E3 (-5 ≤ ambient temperature < 5 °C) - 22 E4 (5 ≤ Ambient temperature < 15 °C) - 20 E5 (15 ≤ Ambient temperature) - 20

[0078] The applicant of the present application further proposes that when a period of time has passed after entering the startup control stage or when the temperature value by which the condensing temperature is higher than the outlet water temperature is too large, the unit can be controlled to enter the operation control stage. Correspondingly, in some embodiments, as Figure 3 shown, the method may further include:

[0079] Step S210, when controlling the energy storage chiller to be in the startup control stage and it is recognized that the preset operation control conditions are met, control the energy storage chiller to enter the operation control stage; where, the preset operation control conditions include any one of the following: the difference between the current condensing temperature and the current outlet water temperature is greater than the first preset correction threshold, the duration of controlling the energy storage chiller to be in the startup control stage exceeds the second preset duration.

[0080] Among them, as a relatively accurate optional implementation, the first preset correction threshold is 5°C. The embodiments of the present application do not specifically limit the second preset duration. For example, the second preset duration can be 12 minutes, 15 minutes, and so on.

[0081] Among them, it can be understood that after the energy storage chiller is controlled to enter the operation control stage, in response to the arrival of the preset operation control cycle, the above step S130 will be executed.

[0082] In some embodiments, determining the target algorithm from the first preset algorithm and the second preset algorithm according to the current ambient temperature, outlet water temperature, return water temperature, and condensation temperature of the current startup control cycle (i.e., involved in step S120), such as Figure 4 as shown, may include:

[0083] Step S310, when the current ambient temperature of the current startup control cycle is less than or equal to the first preset temperature threshold, the current return water temperature of the current startup control cycle is greater than the second preset temperature threshold, and the current condensation temperature of the current startup control cycle is greater than or equal to the current outlet water temperature of the current startup control cycle, the second preset algorithm is used as the target algorithm;

[0084] Step S320, when the current ambient temperature of the current startup control cycle is less than or equal to the first preset temperature threshold and the current return water temperature of the current startup control cycle is less than or equal to the second preset temperature threshold, when the current ambient temperature of the current startup control cycle is less than or equal to the first preset temperature threshold, the current return water temperature of the current startup control cycle is greater than the second preset temperature threshold and the current condensation temperature of the current startup control cycle is less than the current outlet water temperature of the current startup control cycle, and when the current ambient temperature of the current startup control cycle is greater than the first preset temperature threshold, the first preset algorithm is used as the target algorithm.

[0085] Among them, it should be noted that the actual situation will only meet the triggering conditions of step S310 or only meet the triggering conditions of step S320. Therefore, only one of step S310 and step S310 will be executed each time step S120 is executed.

[0086] Among them, the embodiments of the present application do not specifically limit the first preset temperature threshold and the second preset temperature threshold. For example, the first preset temperature threshold can be set to 0°C, -1°C, etc., and the second preset temperature threshold can be set to 38°C, 40°C, etc.

[0087] Represent the current ambient temperature of the current startup control cycle as Tao and the current return water temperature of the current startup control cycle as Tin n, represent the current condensation temperature of this startup control cycle as Pdt, and represent the current outlet water temperature of this startup control cycle as Tout n , and take the first preset temperature threshold as 0°C and the second preset temperature threshold as 40°C as an example to make an exemplary description of the selection of the target algorithm:

[0088] 1. If Tao ≤ 0°C, further judge:

[0089] If Tin n ≤ 40°C, then take the first preset algorithm as the target algorithm;

[0090] If Tin n > 40°C, further judge: If Pdt ≥ Tout n Take the second preset algorithm as the target algorithm. If Pdt < Tout n Take the first preset algorithm as the target algorithm;

[0091] 2. If Tao > 0°C, then take the first preset algorithm as the target algorithm.

[0092] The applicant of the present application further proposes that the return water temperature correction coefficient in the second preset algorithm can be maintained as a constant during the startup control stage. After entering the operation control stage, the temperature value of the condensation temperature higher than the outlet water temperature is also steadily increasing. At this time, the return water temperature correction coefficient can be adjusted according to the rising rate of the outlet water temperature. Correspondingly, in some embodiments, adjusting the return water temperature correction coefficient in the second preset algorithm according to the current return water temperature of this operation control cycle and the return water temperature before the first preset duration (that is, involved in step S130), such as Figure 5 shown, may include:

[0093] Step S410, determine the current rising rate of the return water temperature according to the current return water temperature of this operation control cycle and the return water temperature before the first preset duration;

[0094] Step S420, adjust the return water temperature correction coefficient in the second preset algorithm according to the current return water temperature of this operation control cycle and the rising rate of the return water temperature.

[0095] Among them, the current rising rate of the return water temperature can be calculated by first calculating the difference between the current return water temperature of this operation control cycle and the return water temperature before the first preset duration, and then calculating the ratio of the difference to the return water temperature before the first preset duration.

[0096] As described above, during the normal operation of the energy storage chiller, the temperature of the heated battery is in a continuously stable rising state. The condensation temperature is higher than the outlet water temperature, and the temperature value by which the condensation temperature is higher than the outlet water temperature lies within a relatively stable range. The applicant of the present application further found that this range is approximately 2°C - 5°C. Therefore, it is proposed that the adjustment range of the return water temperature correction coefficient can be determined based on this temperature range, and whether to increase or decrease the return water temperature correction coefficient can be determined based on the rising rate of the return water temperature. Correspondingly, in some embodiments, the return water temperature correction coefficient in the second preset algorithm is adjusted according to the current return water temperature in the present operation control cycle and the rising rate of the return water temperature (i.e., step S420), as Figure 6 shown, may include:

[0097] Step S510, when the current return water temperature in the present operation control cycle is less than or equal to the third preset temperature threshold, the rising rate of the return water temperature is less than the first temperature difference change threshold, and the return water temperature correction coefficient is less than the first preset correction threshold, increase the return water temperature correction coefficient by a preset value;

[0098] Step S520, when the current return water temperature in the present operation control cycle is less than or equal to the third preset temperature threshold, the rising rate of the return water temperature is greater than or equal to the second temperature difference change threshold, and the return water temperature correction coefficient is greater than the second preset correction threshold, decrease the return water temperature correction coefficient by a preset value;

[0099] Step S530, when the current return water temperature in the present operation control cycle is greater than the third preset temperature threshold, the rising rate of the return water temperature is less than the third temperature difference change threshold, and the return water temperature correction coefficient is less than the first preset correction threshold, increase the return water temperature correction coefficient by a preset value;

[0100] Step S540, when the current return water temperature in the present operation control cycle is greater than the third preset temperature threshold, the rising rate of the return water temperature is greater than the first temperature difference change threshold, and the return water temperature correction coefficient is greater than the second preset correction threshold, decrease the return water temperature correction coefficient by a preset value.

[0101] It should be noted that in actual situations, only one of the triggering conditions of step S510, step S520, step S530, and step S540 will be satisfied. Therefore, only one of step S510, step S520, step S530, and step S540 will be executed each time step S420 is executed.

[0102] Among them, as a relatively accurate alternative implementation, the second preset correction threshold is 2°C. The embodiments of the present application do not specifically limit the third preset temperature threshold. For example, the third preset temperature threshold can be set to 45°C, 50°C, and so on. The embodiments of the present application also do not specifically limit the first temperature difference change threshold, the second temperature difference change threshold, and the third temperature difference change threshold. For example, the first temperature difference change threshold can be set to 12.5%, 13%, and so on, the second temperature difference change threshold can be set to 15%, 15.5%, and so on, and the third temperature difference change threshold can be set to 10%, 10.5%, and so on. However, it is necessary to ensure that the third temperature difference change threshold is less than the first temperature difference change threshold, and the first temperature difference change threshold is less than the second temperature difference change threshold.

[0103] Represent the current return water temperature of this operation control cycle as Tin n , and represent the return water temperature before the first preset duration as Tin n-1 , represent the return water temperature correction coefficient as △t, and take the third preset temperature threshold as 45°C, the first preset correction threshold as 5°C, the second preset correction threshold as 2°C, the first temperature difference change threshold as 12.5%, the second temperature difference change threshold as 15%, and the third temperature difference change threshold as 10% as an example to make an exemplary description of adjusting the return water temperature correction coefficient:

[0104] 1. If Tin n ≤45°C, further judge:

[0105] If (Tin n −Tin n-1 ) / Tin n-1 <12.5% and △t<5°C, then increase △t by 1°C;

[0106] If 12.5%≤(Tin n −Tin n-1 ) / Tin n-1 <15%, then keep △t unchanged;

[0107] If (Tin n −Tin n-1 ) / Tin n-1 ≥15% and △t>2°C, then decrease △t by 1°C;

[0108] 2. If Tin n >45°C, further judge:

[0109] If (Tin n −Tin n-1 ) / Tin n-1 <10% and △t<5°C, then increase △t by 1°C;

[0110] If 10%≤(Tinn - Tin n-1 ) / Tin n-1 <12.5%, the Δt remains unchanged;

[0111] If (Tin n - Tin n-1 ) / Tin n-1 ≥12.5% and Δt > 2 °C, then Δt - 1 °C.

[0112] The applicant of the present application proposes that when the return water temperature in the current operation control cycle is greater than the third preset temperature threshold, the condensation temperature is high and the heating effect is poor. Considering the energy conservation requirement of the system, the first temperature difference change threshold can also be set lower than the case when the return water temperature in the current operation control cycle is less than or equal to the third preset temperature threshold.

[0113] The applicant of the present application also proposes that when receiving a compressor start command, the start initialization operation can be performed first, and then the unit can be controlled to enter the start control stage. Correspondingly, in some embodiments, before determining the target algorithm (i.e., the one involved in step S110) from the first preset algorithm and the second preset algorithm according to the current ambient temperature, outlet water temperature, return water temperature, and condensation temperature in the start control cycle when controlling the energy storage chiller to be in the start control stage and the preset start control cycle arrives, as Figure 7 shown, the method may further include:

[0114] Step S610, when receiving a compressor start command, determine the target initial opening according to the current ambient temperature;

[0115] Step S620, control the electronic expansion valve to reset and open to the target initial opening;

[0116] Step S630, control the water pump in the energy storage chiller to start, and detect the state of the water flow switch in the water path of the water pump;

[0117] Step S640, when it is detected that the water flow switch is closed for a third preset duration, control the external fan in the energy storage chiller to start;

[0118] Step S650, when the external fan in the energy storage chiller is started for a fourth preset duration, control the compressor to start;

[0119] Step S660, when the electronic expansion valve is opened to the target initial opening for a fifth preset duration, control the energy storage chiller to enter the start control stage.

[0120] Among them, as an optional implementation, the target initial opening degree can be determined according to Table 2 below:

[0121] Table 2

[0122]

[0123] Among them, in the embodiments of the present application, the third preset duration, the fourth preset duration, and the fifth preset duration are not specifically limited. For example, the third preset duration, the fourth preset duration, and the fifth preset duration can be set to 30 seconds, 10 seconds, and 3 minutes respectively.

[0124] Among them, it can be understood that after the energy storage chiller is controlled to enter the start control stage, in response to the arrival of the preset start control period, the above-mentioned step S110 will be executed.

[0125] As the second aspect of the embodiments of the present application, an electronic device is provided. As shown in Figure 8 , the electronic device includes:

[0126] One or more processors 101;

[0127] A memory 102, on which one or more computer programs are stored. When the one or more computer programs are executed by the one or more processors 101, the one or more processors 101 implement the control method of the energy storage chiller provided in the first aspect of the embodiments of the present application.

[0128] The electronic device may further include one or more I / O interfaces 103, which are connected between the processor 101 and the memory 102 and are configured to implement information interaction between the processor 101 and the memory 102.

[0129] Among them, the processor 101 is a device with data processing capabilities, which includes but is not limited to a central processing unit (CPU), etc.; the memory 102 is a device with data storage capabilities, which includes but is not limited to a random access memory (RAM, more specifically such as SDRAM, DDR, etc.), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a flash memory (FLASH); the I / O interface (read / write interface) is connected between the processor and the memory and can realize information interaction between the processor and the memory, which includes but is not limited to a data bus (Bus), etc.

[0130] In some embodiments, the processor 101, the memory 102, and the I / O interface 103 are connected to each other through a bus 104, and then connected to other components of the computing device.

[0131] As the third aspect of the embodiments of the present application, a thermal energy storage chilled water system is provided. The thermal energy storage chilled water system includes a thermal energy storage chiller unit and the electronic device provided in the second aspect of the embodiments of the present application. Between the battery and the air-conditioning plate heat exchanger of the thermal energy storage chiller unit, a chilled water temperature sensor for detecting the chilled water temperature is provided in the chilled water outlet pipe, and a return water temperature sensor for detecting the return water temperature is provided in the return water pipe.

[0132] The control method of the thermal energy storage chiller unit executed by the electronic device and the structure of the thermal energy storage chiller unit have been described in detail above, so they will not be repeated here.

[0133] As the fourth aspect of the embodiments of the present application, as Figure 9 shown, a computer-readable medium is provided, on which a computer program is stored. When the computer program is executed by a processor, it implements the control method of the thermal energy storage chiller unit provided in the first aspect of the embodiments of the present application.

[0134] Those of ordinary skill in the art can understand that all or part of the processes of implementing the methods in the above embodiments can be completed by instructing relevant hardware through a computer program. Accordingly, the computer program can be stored in a non-volatile computer-readable storage medium, and when the computer program is executed, it can implement the methods of any of the above embodiments. Among them, any reference to a memory, storage, database, or other medium used in the embodiments provided by the present application can include non-volatile and / or volatile memories. Non-volatile memories can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memories can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc.

[0135] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Those skilled in the art should understand that the present application includes but is not limited to the content described in the drawings and the above specific implementation manner. Any modification that does not deviate from the functional and structural principles of the present application will be included in the scope of the claims.

Claims

1. A control method for an energy storage chiller, characterized in that, Between the battery and the air-conditioning plate heat exchanger of the energy storage chiller, an outlet water temperature sensor for detecting the outlet water temperature is provided in the outlet water pipe, and a return water temperature sensor for detecting the return water temperature is provided in the return water pipe; the method includes: When controlling the energy storage chiller to be in the start control stage and the preset start control cycle arrives, determine the target algorithm from the first preset algorithm and the second preset algorithm according to the current ambient temperature, outlet water temperature, return water temperature, and condensation temperature in this start control cycle; Determine the first target exhaust temperature according to the target algorithm, and control the electronic expansion valve in the energy storage chiller according to the first target exhaust temperature; When controlling the energy storage chiller to be in the operation control stage and the preset operation control cycle arrives, adjust the return water temperature correction coefficient in the second preset algorithm according to the current return water temperature in this operation control cycle and the return water temperature before the first preset duration; Determine the second target exhaust temperature according to the adjusted second preset algorithm, and control the electronic expansion valve in the energy storage chiller according to the second target exhaust temperature.

2. The method according to claim 1, characterized in that, The second preset algorithm includes: Target exhaust temperature = A × the current compressor frequency in this cycle + B + C × (the current outlet water temperature in this cycle + Δt) - D × the current ambient temperature in this cycle + E; where, △t represents the return water temperature correction coefficient, and A, B, C, D, and E represent adjustment parameters. The adjustment parameters A and B are determined according to the current compressor frequency in this cycle, and the adjustment parameters C, D, and E are determined according to the current ambient temperature in this cycle.

3. The method according to claim 1, wherein The method further includes: When controlling the energy storage chiller to be in the start control stage and it is recognized that the preset operation control conditions are satisfied, control the energy storage chiller to enter the operation control stage; where, the preset operation control conditions include any one of the following: the difference between the current condensation temperature and the current outlet water temperature is greater than the first preset correction threshold, and the duration of controlling the energy storage chiller to be in the start control stage exceeds the second preset duration.

4. The method according to claim 1, wherein The determining the target algorithm from the first preset algorithm and the second preset algorithm according to the current ambient temperature, outlet water temperature, return water temperature, and condensation temperature in this start control cycle includes: When the current ambient temperature in this start control cycle is less than or equal to the first preset temperature threshold, the current return water temperature in this start control cycle is greater than the second preset temperature threshold, and the current condensation temperature in this start control cycle is greater than or equal to the current outlet water temperature in this start control cycle, use the second preset algorithm as the target algorithm; When the current ambient temperature in the current startup control cycle is less than or equal to the first preset temperature threshold and the current return water temperature in the current startup control cycle is less than or equal to the second preset temperature threshold, when the current ambient temperature in the current startup control cycle is less than or equal to the first preset temperature threshold, the current return water temperature in the current startup control cycle is greater than the second preset temperature threshold, and the current condensation temperature in the current startup control cycle is less than the current outlet water temperature in the current startup control cycle, and when the current ambient temperature in the current startup control cycle is greater than the first preset temperature threshold, the first preset algorithm is used as the target algorithm in all cases.

5. The method according to claim 1, characterized in that, Adjusting the return water temperature correction coefficient in the second preset algorithm according to the current return water temperature in the current operation control cycle and the return water temperature before the first preset duration includes: Determining the current return water temperature rising rate according to the current return water temperature in the current operation control cycle and the return water temperature before the first preset duration; Adjusting the return water temperature correction coefficient in the second preset algorithm according to the current return water temperature in the current operation control cycle and the return water temperature rising rate.

6. The method according to claim 5, characterized in that, Adjusting the return water temperature correction coefficient in the second preset algorithm according to the current return water temperature in the current operation control cycle and the return water temperature rising rate includes: When the current return water temperature in the current operation control cycle is less than or equal to the third preset temperature threshold, the return water temperature rising rate is less than the first temperature difference change threshold, and the return water temperature correction coefficient is less than the first preset correction threshold, increasing the return water temperature correction coefficient by a preset value; When the current return water temperature in the current operation control cycle is less than or equal to the third preset temperature threshold, the return water temperature rising rate is greater than or equal to the second temperature difference change threshold, and the return water temperature correction coefficient is greater than the second preset correction threshold, decreasing the return water temperature correction coefficient by a preset value; When the current return water temperature in the current operation control cycle is greater than the third preset temperature threshold, the return water temperature rising rate is less than the third temperature difference change threshold, and the return water temperature correction coefficient is less than the first preset correction threshold, increasing the return water temperature correction coefficient by a preset value; When the current return water temperature in the current operation control cycle is greater than the third preset temperature threshold, the return water temperature rising rate is greater than the first temperature difference change threshold, and the return water temperature correction coefficient is greater than the second preset correction threshold, decreasing the return water temperature correction coefficient by a preset value.

7. The method according to any one of claims 1-6, characterized in that, Before determining the target algorithm from the first preset algorithm and the second preset algorithm according to the current ambient temperature, outlet water temperature, return water temperature, and condensation temperature in the current startup control cycle when controlling the energy storage chiller in the startup control stage and the preset startup control cycle arrives, the method further includes: When receiving a compressor startup instruction, determining a target initial opening according to the current ambient temperature; Controlling the electronic expansion valve to reset and open to the target initial opening; Controlling the water pump in the energy storage chiller to start and detecting the state of the water flow switch in the water path of the water pump; When it is detected that the water flow switch is closed for a third preset duration, control the external fan in the energy storage chiller to turn on; When the external fan in the energy storage chiller is controlled to turn on for a fourth preset duration, control the compressor to start; When the electronic expansion valve is controlled to open to the target initial opening for a fifth preset duration, control the energy storage chiller to enter the start control stage.

8. An electronic device, characterized in that, The electronic device includes: One or more processors; A memory having stored thereon one or more computer programs, which when executed by the one or more processors cause the one or more processors to implement the control method of the energy storage chiller according to any one of claims 1-7.

9. An energy storage chilled water system, characterized in that, The energy storage chiller system includes an energy storage chiller and the electronic device according to claim 8. Between the battery of the energy storage chiller and the air-conditioning plate heat exchanger, an outlet water temperature sensor for detecting the outlet water temperature is provided in the outlet water pipe, and a return water temperature sensor for detecting the return water temperature is provided in the return water pipe.

10. A computer-readable medium having a computer program stored thereon, characterized in that, The computer program, when executed by the processor, implements the control method of the energy storage chiller according to any one of claims 1-7.

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