Control method and device for water mixing station of central heating system, equipment and medium

Abstract

This invention relates to the field of mixing station control technology, and discloses a control method, device, equipment, and medium for a mixing station in a centralized heating system. The control method for the mixing station in a centralized heating system includes: determining an initial mixing ratio based on the target heating temperature of the secondary network, the return water temperature of the secondary network, and the supply water temperature of the primary network; determining a load correction coefficient based on the temperature load correction slope coefficient, the ambient temperature, and the standard ambient temperature; correcting the initial mixing ratio based on the load correction coefficient; controlling the opening of the primary network valves of the mixing station based on the obtained target mixing ratio; determining the total flow rate of the secondary network; adjusting the frequency converter of the secondary network circulation pump based on the total flow rate of the secondary network. This invention corrects the initial mixing ratio through the load correction coefficient, and combines it with the ambient temperature to make the obtained mixing ratio more accurate. The frequency converter of the secondary network circulation pump is adjusted based on the total flow rate of the secondary network to maintain hydraulic balance.

Description

Technical Field

[0001] This invention relates to the field of mixing station control technology, specifically to control methods, devices, equipment, and media for mixing stations in centralized heating systems. Background Technology

[0002] Central heating systems are large-scale urban public infrastructure used to provide heating for residents during winter. A central heating system consists of a primary network, a secondary network, and a mixing station. The primary network supplies high-temperature water, the secondary network supplies water to users, and the mixing station is the core hub connecting the primary and secondary networks. The core function of the mixing station is to mix the return water from the secondary network with the high-temperature water from the primary network, thereby adjusting the temperature of the secondary network's water supply to the range required by users. Therefore, the mixing station needs to be controlled to ensure water supply to users while maintaining the hydraulic balance of the network.

[0003] The mixing station control method in related technologies involves real-time acquisition of the actual water supply temperature, determination of the temperature difference between the actual water supply temperature and the target temperature of the secondary network water supply set by the user, outputting a control signal based on the temperature difference using a proportional-integral-derivative algorithm, adjusting the opening of the primary network electric regulating valve, changing the mixing amount of high-temperature water in the primary network, and maintaining a constant flow rate of the secondary network circulation pump to ensure stable pipeline pressure.

[0004] However, this method only uses the secondary network water supply temperature as a single parameter for adjustment, without considering the dynamic fluctuations of the user's heat load. This results in large fluctuations in the secondary network water supply temperature, which cannot meet the user's demand for high-precision and high-comfort heating. Summary of the Invention

[0005] This invention provides a control method, device, equipment, and medium for a mixing station in a centralized heating system, to solve the problem that the secondary network water supply temperature fluctuates greatly due to the control method of the mixing station in related technologies, which fails to meet the user's demand for high-precision and high-comfort heating.

[0006] In a first aspect, the present invention provides a control method for a mixing station in a centralized heating system, comprising: determining an initial mixing ratio of the mixing station based on the target heating temperature of the secondary network, the return water temperature of the secondary network, and the supply water temperature of the primary network of the centralized heating system; the primary network is used to provide water at a first temperature, the secondary network is used to provide water at a second temperature, and the mixing station is used to mix the supply water from the primary network and the return water from the secondary network, wherein the first temperature is greater than the second temperature; determining a load correction coefficient based on a temperature load correction slope coefficient, the ambient temperature, and a standard ambient temperature; the temperature load correction slope coefficient is used to characterize the proportion of building heat load change corresponding to changes in outdoor air temperature; correcting the initial mixing ratio based on the load correction coefficient to obtain a target mixing ratio; controlling the opening degree of the primary network valve of the mixing station based on the target mixing ratio; determining the total flow rate of the secondary network based on the target heating temperature of the secondary network, the return water temperature of the secondary network, and the user's heat demand; adjusting the frequency converter of the circulating pump of the secondary network based on the total flow rate of the secondary network until the actual secondary network flow rate equals the total flow rate of the secondary network.

[0007] The control method for the mixing station of the centralized heating system of the present invention determines the initial mixing ratio of the mixing station based on the target heating temperature of the secondary network, the return water temperature of the secondary network, and the supply water temperature of the primary network of the target centralized heating system. A basic mixing ratio logic is established based on the measured temperatures at both ends of the primary and secondary networks, matching the actual temperature difference of the heat exchange medium in the target centralized heating system, so that the initial mixing ratio conforms to the inherent hydraulic and thermodynamic characteristics of the pipe network. The present invention determines the load correction coefficient based on the temperature load correction slope coefficient, the external ambient temperature, and the standard ambient temperature. It introduces the outdoor air temperature and the standard air temperature to determine the load correction coefficient, accurately matching the objective law of building heat load fluctuation with outdoor temperature. The initial mixing ratio is corrected according to the load correction coefficient to obtain the target mixing ratio, realizing adaptive adjustment of the mixing ratio according to weather changes, improving the accuracy of the target mixing ratio. The opening of the primary network valves of the mixing station is controlled according to the target mixing ratio, forming a closed-loop control logic from determining the target mixing ratio to controlling the opening of the primary network valves of the mixing station. By controlling the opening of the primary network valves, the amount of high-temperature water mixed in the primary network is adjusted, thereby adjusting the supply water temperature of the secondary network. This invention determines the total flow rate of the secondary network based on the target heating temperature, return water temperature, and user heat demand. The variable frequency drive (VFD) of the secondary network's circulating pump is adjusted according to this total flow rate until the actual secondary network flow rate equals the total flow rate. The theoretical total flow rate is calculated by combining the supply and return water temperature difference with the user's actual heat demand. This flow rate calculation closely matches real-time heating consumption. The VFD-adjusted circulating pump frequency achieves closed-loop pressure and flow stabilization control, dynamically matching the required circulating water volume of the network. This avoids energy waste from redundant large-flow circulation and maintains hydraulic balance.

[0008] In one optional implementation, the initial mixing ratio of the mixing station is determined based on the target heating temperature of the secondary network, the return water temperature of the secondary network, and the supply water temperature of the primary network of the target centralized heating system. This includes: obtaining a first temperature difference based on the difference between the target heating temperature of the secondary network and the return water temperature of the secondary network; obtaining a second temperature difference based on the difference between the supply water temperature of the primary network and the return water temperature of the secondary network; and obtaining the initial mixing ratio of the mixing station based on the quotient of the first temperature difference and the second temperature difference.

[0009] In one optional implementation, the load correction coefficient is determined based on the temperature load correction slope coefficient, the ambient temperature, and the standard ambient temperature, including: obtaining a third temperature difference based on the difference between the standard ambient temperature and the ambient temperature; obtaining a first product result based on the product of the third temperature difference and the temperature load correction slope coefficient; and obtaining the load correction coefficient based on the sum of the first product result and a preset value; the preset value is 1.

[0010] In one optional implementation, the initial mixing ratio is corrected according to the load correction factor to obtain the target mixing ratio, and the opening of the primary network valve of the mixing station is controlled according to the target mixing ratio, including: obtaining the target mixing ratio by multiplying the load correction factor and the initial mixing ratio; and adjusting the opening of the primary network valve of the mixing station according to the target mixing ratio.

[0011] In one optional implementation, after controlling the opening degree of the primary network valve of the mixing station according to the target mixing ratio, the control method of the mixing station of the centralized heating system further includes: acquiring the real-time secondary network water supply temperature; obtaining a fourth temperature difference based on the difference between the target heating temperature of the secondary network and the real-time secondary network water supply temperature; comparing the fourth temperature difference with a preset temperature difference threshold to obtain a comparison result; and adjusting the parameters of the proportional-integral-derivative controller according to the comparison result.

[0012] In one optional implementation, the total flow rate of the secondary network is determined based on the target heating temperature of the secondary network, the return water temperature of the secondary network, and the user's heat demand. This includes: obtaining a second product result based on the product of a first temperature difference, the specific heat capacity of water, and the density of water; and obtaining the total flow rate of the secondary network based on the quotient of the user's heat demand and the second product result.

[0013] Secondly, the present invention provides a control device for a mixing station in a centralized heating system, comprising: an initial mixing ratio determination module, used to determine the initial mixing ratio of the mixing station based on the target heating temperature of the secondary network, the return water temperature of the secondary network, and the supply water temperature of the primary network of the centralized heating system; the primary network provides water at a first temperature, the secondary network provides water at a second temperature, and the mixing station mixes the supply water from the primary network and the return water from the secondary network, wherein the first temperature is greater than the second temperature; a correction coefficient determination module, used to determine a load correction coefficient based on a temperature load correction slope coefficient, an ambient temperature, and a standard ambient temperature; the temperature load correction slope coefficient characterizes the proportion of building heat load change corresponding to changes in outdoor air temperature; a target mixing ratio determination module, used to correct the initial mixing ratio based on the load correction coefficient to obtain a target mixing ratio, and control the opening degree of the primary network valve of the mixing station based on the target mixing ratio; and a flow regulation module, used to determine the total flow rate of the secondary network based on the target heating temperature of the secondary network, the return water temperature of the secondary network, and the user's heat demand, and adjust the frequency converter of the circulating pump of the secondary network based on the total flow rate of the secondary network until the actual secondary network flow rate equals the total flow rate of the secondary network.

[0014] Thirdly, the present invention provides an electronic device, comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the control method of the mixing station of the centralized heating system described in the first aspect or any corresponding embodiment thereof.

[0015] Fourthly, the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to execute the control method for the mixing station of a centralized heating system according to the first aspect or any corresponding embodiment described above.

[0016] Fifthly, the present invention provides a computer program product, including computer instructions for causing a computer to execute the control method for the mixing station of a centralized heating system according to the first aspect or any corresponding embodiment described above. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of an application scenario according to an embodiment of the present invention; Figure 2 This is a schematic flowchart of a first method for controlling a mixing station in a centralized heating system according to an embodiment of the present invention. Figure 3 This is a schematic diagram of a centralized heating system according to an embodiment of the present invention; Figure 4 This is a second flowchart illustrating the control method for the mixing station of a centralized heating system according to an embodiment of the present invention. Figure 5 This is a third flowchart illustrating the control method for the mixing station of a centralized heating system according to an embodiment of the present invention. Figure 6 This is a structural block diagram of the control device for the mixing station of a centralized heating system according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] It is understood that before using the technical solutions disclosed in the various embodiments of the present invention, users should be informed of the types, scope of use, and usage scenarios of the personal information involved in the present invention and their authorization should be obtained in accordance with relevant laws and regulations through appropriate means.

[0021] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] As an optional application scenario of this invention, such as Figure 1 As shown, the control system of the mixing station of the centralized heating system may include at least one terminal device and at least one server. Figure 1 The system is illustrated in the example, which includes a computer 101, a mobile terminal 102, and a server 103, and the terminal devices such as the computer 101 and the mobile terminal 102 are connected to the server 103 through a network 110.

[0023] Specifically, the terminal device can be a smartphone, tablet, laptop, PDA, desktop computer, game console, smart TV, smart wearable device, in-vehicle terminal, VR (Virtual Reality) device, AR (Augmented Reality) device, etc. Server 103 can be a standalone physical server, a server cluster, a distributed system, or a cloud server providing cloud services. Network 110 can be a wired or wireless network, examples of which include, but are not limited to, the Internet, corporate intranet, local area network, wide area network, mobile communication network, and combinations thereof.

[0024] The control methods for mixing stations in related technologies are mainly divided into three categories: manual valve regulation technology, PID (Proportional-Integral-Derivative) automatic regulation technology, and simple flow feedback regulation technology. Among them, PID automatic regulation technology has become the mainstream solution due to its low implementation cost and wide adaptability, but it still has shortcomings such as insufficient regulation accuracy and inability to adapt to dynamic loads. PID automatic regulation technology only uses the secondary network water supply temperature as a single parameter for regulation, without considering the dynamic fluctuations of user-side heat load (such as diurnal temperature difference, changes in heat consumption during rain and snow, and differences in building insulation), and also lacks a predictive mechanism for changes in ambient temperature. When the external temperature changes abruptly, the system response time is as long as 10s to 15s, which cannot adapt to load changes in a timely manner, resulting in secondary network water supply temperature fluctuations of up to ±3℃ to 5℃, failing to meet the high-precision and high-comfort heating needs of users, and also easily causing energy waste. The secondary network circulating pump maintains a constant flow rate for a long time without adjusting the flow rate according to the actual user load. During periods when user heat load decreases (such as at night and holidays), water pumps still operate at full load, generating a large amount of ineffective circulation energy consumption. The energy consumption of pump and valve regulation accounts for 5% to 8% of the total heating supply, resulting in low overall operational energy efficiency. The overall water supply temperature is controlled by regulating the total flow rate of the primary network, without fine-tuning the flow rate distribution to each branch of the secondary network. This regulation method easily leads to excessive flow and excessively high room temperatures for nearby users, while insufficient flow and excessively low room temperatures for distant users, causing significant differences in room temperature and uneven heating within the same heating network.

[0025] This invention provides a control method for a mixing station in a centralized heating system. The initial mixing ratio is corrected by a load correction coefficient, and the frequency of the circulating pump in the secondary network is adjusted according to the total flow of the secondary network to achieve a more accurate mixing ratio and maintain hydraulic balance.

[0026] According to an embodiment of the present invention, a control method embodiment for a mixing station of a centralized heating system is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0027] This embodiment provides a control method for a mixing station in a centralized heating system, which can be used with computer equipment. Figure 2 This is a first flowchart of a control method for a mixing station in a centralized heating system according to an embodiment of the present invention, as shown below. Figure 2 As shown, the process includes the following steps: Step S201: Determine the initial mixing ratio of the mixing station based on the target heating temperature of the secondary network, the return water temperature of the secondary network, and the supply water temperature of the primary network of the target centralized heating system.

[0028] The target centralized heating system is a heating network equipment system that requires regulation. It includes a heat source, primary network, secondary network, mixing station, primary network electric three-way valve, secondary network circulation pump, and branch flow regulating valves. The mixing station is used to mix high-temperature water from the primary network with return water from the secondary network. The intelligent mixing tank of the mixing station uses a carbon steel lining with an anti-corrosion layer and has a volume greater than or equal to 500L. The primary network electric three-way valve is used to adjust the mixing ratio of primary network water supply, with an electric adjustment accuracy of ±0.5% and a pressure resistance of 1.6MPa. The secondary network circulation pump is driven by a variable flow rate to adapt to load changes, using a variable frequency motor (0Hz~50Hz) and a head of 30m~50m. The branch flow regulating valve is used to adjust the flow distribution of each branch of the secondary network, electromagnetically driven, with a flow adjustment range of 0m³ / h~100m³ / h.

[0029] For example, such as Figure 3 The diagram shows the structure of a centralized heating system. The primary network provides high-temperature water at 90℃ to 110℃. This high-temperature water flows into the intelligent mixing station through an electric three-way valve for mixing. The water in the intelligent mixing station flows into the corresponding secondary network branches through multiple branch regulating valves, thus supplying water to multiple user groups. The secondary network return water is 30℃-40℃ and returns to the intelligent mixing station via a circulating pump after being driven by a frequency converter signal.

[0030] In some alternative implementations, a primary network is used to provide water at a first temperature, a secondary network is used to provide water at a second temperature, and a mixing station is used to mix the water supplied from the primary network and the return water from the secondary network, wherein the first temperature is greater than the second temperature.

[0031] In some optional implementations, the secondary network is a pipeline loop that outputs and transports low-temperature heating water from the mixing station to residential users; the target heating temperature is the set ideal water supply temperature supplied to users by the secondary network, for example, a target heating temperature of 45℃~55℃; the secondary network return water temperature is the measured temperature of the low-temperature return water flowing back to the mixing station after the user dissipates heat, for example, a secondary network return water temperature of 30℃~40℃; the primary network supply water temperature is the measured temperature of the high-temperature hot water delivered from the heat source to the mixing station, for example, a primary network supply water temperature of 90℃~110℃. The mixing station is used to mix high-temperature primary water supply with low-temperature secondary return water to output warm water that meets heating requirements; the initial mixing ratio is the volume mixing ratio of high-temperature water from the primary network and return water from the secondary network before considering outdoor temperature and building load correction.

[0032] Step S202: Determine the load correction coefficient based on the temperature load correction slope coefficient, the ambient temperature, and the standard ambient temperature; the temperature load correction slope coefficient is used to characterize the proportion of building heat load change corresponding to changes in outdoor temperature.

[0033] The temperature load correction slope coefficient is a pre-calibrated constant that represents the percentage increase in building heating load for every 1°C decrease in outdoor temperature. For example, the temperature load correction slope coefficient can be 0.02.

[0034] In some optional implementations, the ambient temperature is the outdoor air temperature collected in real time by the outdoor meteorological station in the mixing station area; the standard ambient temperature is the local heating design benchmark outdoor temperature; the load correction factor is the multiplier used to correct the basic mixing ratio. When the outdoor temperature deviates from the standard temperature, the mixing ratio is increased or decreased to match the actual heating demand; the building heat load change ratio is the increase or decrease in the amount of heat required for the overall heating of the building or community caused by fluctuations in outdoor temperature.

[0035] Step S203: Correct the initial mixing ratio according to the load correction coefficient to obtain the target mixing ratio, and control the opening of the primary network valve of the mixing station according to the target mixing ratio.

[0036] Among them, the target mixing ratio is the final primary water mixing ratio adapted to the current outdoor temperature and the actual heat demand of the building; the primary network valve is the electric regulating ball valve of the primary high-temperature water inlet pipeline of the mixing station, and the opening degree of 0~100% corresponds to the water inlet flow rate; the opening degree of the primary network valve is the percentage of the electric valve core opening. The larger the opening degree, the more primary high-temperature water flows into the mixing chamber.

[0037] Step S204: Determine the total flow rate of the secondary network based on the target heating temperature of the secondary network, the return water temperature of the secondary network, and the user's heat demand. Adjust the frequency of the circulating pump of the secondary network according to the total flow rate of the secondary network until the actual flow rate of the secondary network equals the total flow rate of the secondary network.

[0038] Among them, the user heat demand is the total heat demand of the users in advance, which can be determined based on the real-time total heating load of all buildings in the community.

[0039] In some optional implementations, the total flow rate of the secondary network is the total volume of circulating water transported per hour in the secondary network; the frequency of the circulating pump is the output power frequency of the circulating pump inverter, and the higher the frequency, the greater the pump speed and the greater the water flow rate; the preset total flow rate is the standard theoretical circulating flow rate that matches the current heat demand.

[0040] The control method for the mixing station of a centralized heating system provided in this embodiment determines the initial mixing ratio of the mixing station based on the target heating temperature of the secondary network, the return water temperature of the secondary network, and the supply water temperature of the primary network of the target centralized heating system. A basic mixing ratio logic is established based on the measured temperatures at both ends of the primary and secondary networks, matching the actual temperature difference of the heat exchange medium in the target centralized heating system, so that the initial mixing ratio conforms to the inherent hydraulic and thermal characteristics of the pipe network. This invention determines the load correction coefficient based on the temperature load correction slope coefficient, the external ambient temperature, and the standard ambient temperature. It introduces the outdoor air temperature and the standard air temperature to determine the load correction coefficient, accurately matching the objective law of building heat load fluctuation with outdoor temperature. The initial mixing ratio is corrected according to the load correction coefficient to obtain the target mixing ratio, achieving adaptive adjustment of the mixing ratio according to weather changes, improving the accuracy of the target mixing ratio. The opening of the primary network valves of the mixing station is controlled according to the target mixing ratio, forming a closed-loop control logic from determining the target mixing ratio to controlling the opening of the primary network valves of the mixing station. By controlling the opening of the primary network valves, the amount of high-temperature water mixed in the primary network is adjusted, thereby regulating the supply water temperature of the secondary network. This invention determines the total flow rate of the secondary network based on the target heating temperature, return water temperature, and user heat demand. The variable frequency drive (VFD) of the secondary network's circulating pump is adjusted according to this total flow rate until the actual secondary network flow rate equals the total flow rate. The theoretical total flow rate is calculated by combining the supply and return water temperature difference with the user's actual heat demand. This flow rate calculation closely matches real-time heating consumption. The VFD-adjusted circulating pump frequency achieves closed-loop pressure and flow stabilization control, dynamically matching the required circulating water volume of the network. This avoids energy waste from redundant large-flow circulation and maintains hydraulic balance.

[0041] This embodiment provides a control method for a mixing station in a centralized heating system, which can be used with computer equipment. Figure 4 This is a second flowchart of a control method for a mixing station in a centralized heating system according to an embodiment of the present invention, as shown below. Figure 4 As shown, the process includes the following steps: Step S401: Determine the initial mixing ratio of the mixing station based on the target heating temperature of the secondary network, the return water temperature of the secondary network, and the supply water temperature of the primary network of the target centralized heating system.

[0042] Specifically, step S401 includes: Step S4011: Obtain the first temperature difference based on the difference between the target heating temperature of the secondary network and the return water temperature of the secondary network.

[0043] Step S4012: Obtain the second temperature difference based on the difference between the supply water temperature of the primary network and the return water temperature of the secondary network.

[0044] Step S4013: Obtain the initial mixing ratio of the mixing station based on the quotient of the first temperature difference and the second temperature difference.

[0045] For example, the formula for determining the initial mixing ratio is: ; in, This is the initial mixing ratio. The target heating temperature for the secondary network. This refers to the return water temperature of the secondary network. This refers to the water supply temperature of the primary network.

[0046] Step S402: Determine the load correction coefficient based on the temperature load correction slope coefficient, the ambient temperature, and the standard ambient temperature; the temperature load correction slope coefficient is used to characterize the proportion of building heat load change corresponding to changes in outdoor temperature.

[0047] Specifically, step S402 includes: Step S4021: Obtain the third temperature difference based on the difference between the standard ambient temperature and the external ambient temperature.

[0048] Step S4022: Obtain the first product result based on the product of the third temperature difference and the temperature load correction slope coefficient.

[0049] Step S4023: Obtain the load correction coefficient based on the sum of the first product result and the preset value; the preset value is 1.

[0050] In some alternative implementations, the formula for determining the load correction factor can be: ; in, This is the load correction factor. The slope coefficient is a correction factor for temperature load. Standard ambient temperature, The ambient temperature.

[0051] For example, when the third temperature difference is 10°C, The ratio is 1.2, the mixing ratio is increased by 1.2 times, and more high-temperature hot water is added to cope with severe cold. If the third temperature difference is negative, A value less than 1 reduces the amount of high-temperature primary water added, saving heat resources. Introducing outdoor air temperature for load forecasting compensates for the shortcomings of simply using water temperature ratios without considering weather conditions, enabling advance temperature control.

[0052] In some optional implementations, the temperature load correction slope coefficient can be finely adjusted according to the building insulation level: it can be adjusted to 0.022 for old buildings with poor insulation and to 0.018 for new insulated villas. The system has parameter adaptation space and is modularly compatible with different community conditions.

[0053] Step S403: Correct the initial mixing ratio according to the load correction coefficient to obtain the target mixing ratio, and control the opening of the primary network valve of the mixing station according to the target mixing ratio.

[0054] Specifically, step S403 includes: Step S4031: Obtain the target mixing ratio by multiplying the load correction coefficient by the initial mixing ratio.

[0055] In some alternative implementations, the formula for determining the target mixing ratio is: ; in, To achieve the target mixing ratio, This is the initial mixing ratio. This is the load correction factor.

[0056] For example, when the ambient temperature drops from 15°C to 5°C, and the third temperature difference is 10°C, then If the initial mixing ratio is 0.3, the target mixing ratio is 0.36. The opening of the primary network valve increases, increasing the amount of high-temperature water mixed in, and adapting to the increased heat load in advance.

[0057] Step S4032: Adjust the opening of the primary network valve of the mixing station according to the target mixing ratio.

[0058] If the target mixing ratio is greater than the initial mixing ratio, the opening of the primary network valve increases to increase the amount of high-temperature water mixed in; if the target mixing ratio is less than the initial mixing ratio, the opening of the primary network valve decreases to reduce the amount of high-temperature water mixed in.

[0059] In some optional implementations, after controlling the opening of the primary network valve of the mixing station according to the target mixing ratio, the control method of the mixing station of the centralized heating system further includes: obtaining the real-time secondary network water supply temperature; obtaining a fourth temperature difference based on the difference between the target heating temperature of the secondary network and the real-time secondary network water supply temperature; comparing the fourth temperature difference with a preset temperature difference threshold to obtain a comparison result; and adjusting the parameters of the proportional-integral-derivative controller according to the comparison result.

[0060] The preset temperature difference threshold can be set according to actual conditions. For example, the preset temperature difference threshold includes 0.5℃ and 1℃. When the absolute value of the fourth temperature difference is greater than 1℃, the fuzzy rule determines it as a large deviation and outputs a large proportion of PID parameter correction: increasing the proportional coefficient Kp to quickly pull back the temperature, increasing the derivative coefficient Kd to suppress rapid temperature rise and fall, quickly correcting the opening of the mixing valve, and preventing the temperature difference from continuing to expand. When the absolute value of the fourth temperature difference is less than or equal to 1℃ and the absolute value of the fourth temperature difference is greater than 0.5℃, the fuzzy rule determines it as a medium-amplitude correction of the PID parameters, moderately reducing the integral coefficient Ki to prevent overshoot caused by integral accumulation, and smoothly adjusting the valve to avoid the temperature from exceeding the ±1℃ boundary. When the absolute value of the fourth temperature difference is less than or equal to 0.5℃, the adjustment intensity of the proportional coefficient Kp and integral coefficient Ki is weakened, the valve action amplitude is reduced, the valve is prevented from frequent reciprocating oscillations, and the temperature is maintained stably.

[0061] Step S404: Determine the total flow rate of the secondary network based on the target heating temperature of the secondary network, the return water temperature of the secondary network, and the user's heat demand. Adjust the frequency of the circulating pump of the secondary network according to the total flow rate of the secondary network until the actual flow rate of the secondary network equals the total flow rate of the secondary network.

[0062] Specifically, step S404 includes: Step S4041: Based on the product of the first temperature difference, the specific heat capacity of water, and the density of water, the second product result is obtained.

[0063] Step S4042: Based on the quotient of the user's heat demand and the second product result, the total flow of the secondary network is obtained.

[0064] For example, the formula for determining the total traffic of the secondary network is: ; in, This represents the total traffic of the secondary network. To meet users' calorie needs, The specific heat capacity of water, The density of water, The target heating temperature for the secondary network. This refers to the return water temperature of the secondary network.

[0065] Step S4043: Adjust the frequency of the circulating pump of the secondary network according to the total flow of the secondary network until the actual flow of the secondary network equals the total flow of the secondary network.

[0066] In some alternative implementations, the frequency of the secondary network circulation pump is controlled (0Hz~50Hz) so that the actual secondary network flow rate approaches the total flow rate of the secondary network, thereby achieving variable flow operation.

[0067] In some alternative implementations, the flow rate is allocated according to the number of users and building area of ​​each user branch (e.g., if the number of users in user branch 1 accounts for 30%, then 30% of the actual secondary network flow rate is allocated). By adjusting the opening of the branch flow regulating valve, the flow rate of each user branch is ensured to be uniform, thus solving the hydraulic imbalance.

[0068] In some optional implementations, the operating vibration of the circulating pump is monitored by a vibration sensor (normal operating vibration is less than or equal to 2.5 mm / s, and an alarm is triggered if it exceeds the standard), and the valve drive current is monitored by a current sensor (normal is 0.5A~1A, and an alarm is triggered if it is abnormal). When the parameters exceed the threshold, an audible and visual alarm is immediately issued and pushed to the operation and maintenance personnel. At the same time, the backup adjustment scheme is activated (such as switching to the backup valve if the valve is stuck) to avoid heating interruption.

[0069] The control method for the mixing station of the centralized heating system provided in this embodiment combines temperature, flow rate, and environmental parameters, and uses a mixing ratio correction coefficient to achieve load prediction, thus solving the problem of low single-parameter adjustment accuracy; the circulating pump operates with variable frequency and variable flow rate, and cooperates with the branch flow regulating valve to distribute the flow, while solving the problems of high energy consumption and hydraulic imbalance; and the integration of equipment status monitoring such as vibration and current enables fault prediction and backup scheme switching, thereby improving system stability.

[0070] This embodiment provides a control method for a mixing station in a centralized heating system, which can be used with computer equipment. Figure 5 This is a third flowchart of a control method for a mixing station in a centralized heating system according to an embodiment of the present invention, as shown below. Figure 5 As shown, the process includes the following steps: The parameters are collected and then sequentially processed through load calculation, mixing ratio correction, pump frequency adjustment, and branch flow distribution. Temperature / flow feedback is then used to determine whether the parameters meet the standards. If the parameters meet the standards, the current state is maintained; otherwise, the process returns to the correction stage, forming a closed-loop control. Simultaneously, equipment status monitoring is performed, and any abnormalities trigger a fault warning.

[0071] This invention employs a multi-parameter load adaptive algorithm to control secondary network water supply temperature fluctuations within ±1℃, significantly improving adjustment accuracy. It can also predict ambient temperature changes and quickly adapt to dynamic loads, resolving the issue of fluctuating room temperatures. Variable flow regulation reduces circulating pump energy consumption, lowering the system's overall energy consumption and saving substantial electricity costs annually. Simultaneously, branch flow distribution minimizes room temperature differences among users, resolving hydraulic imbalances. A fault warning module detects equipment anomalies early, reducing the probability of sudden shutdowns and supporting remote monitoring and adjustment, eliminating the need for on-site manual intervention and lowering maintenance costs. This invention uses a linear coefficient of 0.02 to build a predictive model for the air temperature-mixing water ratio, adjusting before room and water temperatures drop. It increases the proportion of high-temperature water in advance during cold weather, reducing lag and minimizing temperature fluctuations to ±1℃ from a control logic perspective. The coefficient can be fine-tuned according to building insulation levels; for older buildings with poor insulation, it can be adjusted to 0.022, while for newer insulated apartments, it can be adjusted to 0.018, providing parameter adaptability and modular compatibility with different community conditions.

[0072] This embodiment also provides a control device for a mixing station of a centralized heating system. This device is used to implement the above embodiments and preferred embodiments, and details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0073] This embodiment provides a control device for a mixing station in a centralized heating system, such as... Figure 6 As shown, it includes: The initial mixing ratio determination module 601 is used to determine the initial mixing ratio of the mixing station based on the target heating temperature of the secondary network, the return water temperature of the secondary network, and the supply water temperature of the primary network of the target centralized heating system. The primary network is used to provide water at a first temperature, the secondary network is used to provide water at a second temperature, and the mixing station is used to mix the supply water from the primary network and the return water from the secondary network. The first temperature is greater than the second temperature.

[0074] The correction coefficient determination module 602 is used to determine the load correction coefficient based on the temperature load correction slope coefficient, the external ambient temperature, and the standard ambient temperature; the temperature load correction slope coefficient is used to characterize the proportion of building heat load change corresponding to changes in outdoor air temperature.

[0075] The target mixing ratio determination module 603 is used to correct the initial mixing ratio according to the load correction coefficient to obtain the target mixing ratio, and to control the opening degree of the primary network valve of the mixing station according to the target mixing ratio.

[0076] The flow regulation module 604 is used to determine the total flow rate of the secondary network based on the target heating temperature of the secondary network, the return water temperature of the secondary network, and the user's heat demand, and to adjust the frequency of the circulating pump of the secondary network according to the total flow rate of the secondary network until the actual secondary network flow rate equals the total flow rate of the secondary network.

[0077] In some optional implementations, the initial mixing ratio determination module 601 includes: The first temperature difference determination unit is used to obtain the first temperature difference based on the difference between the target heating temperature of the secondary network and the return water temperature of the secondary network.

[0078] The second temperature difference determination unit is used to obtain the second temperature difference based on the difference between the supply water temperature of the primary network and the return water temperature of the secondary network.

[0079] The initial mixing ratio determination unit is used to obtain the initial mixing ratio of the mixing station based on the quotient of the first temperature difference and the second temperature difference.

[0080] In some alternative implementations, the correction coefficient determination module 602 includes: The third temperature difference determination unit is used to obtain the third temperature difference based on the difference between the standard ambient temperature and the external ambient temperature.

[0081] The first product unit is used to obtain the first product result by multiplying the third temperature difference and the temperature load correction slope coefficient.

[0082] The correction coefficient determination unit is used to obtain the load correction coefficient based on the sum of the first product result and the preset value; the preset value is 1.

[0083] In some optional implementations, the target mixing ratio determination module 603 includes: The target mixing ratio determination unit is used to obtain the target mixing ratio based on the product of the load correction coefficient and the initial mixing ratio.

[0084] The valve opening adjustment unit is used to adjust the opening of the primary network valves of the mixing station according to the target mixing ratio.

[0085] In some alternative implementations, the flow regulation module 604 includes: The second product unit is used to obtain the second product result based on the product of the first temperature difference, the specific heat capacity of water, and the density of water.

[0086] The total flow determination unit is used to obtain the total flow of the secondary network based on the quotient of the user's heat demand and the result of the second product.

[0087] In some alternative implementations, the control device for the mixing station of the centralized heating system includes: The fourth temperature difference determination unit is used to obtain the real-time secondary network water supply temperature and obtain the fourth temperature difference based on the difference between the target heating temperature of the secondary network and the real-time secondary network water supply temperature.

[0088] The parameter adjustment unit is used to compare the fourth temperature difference with the preset temperature difference threshold, obtain the comparison result, and adjust the parameters of the proportional-integral-derivative controller according to the comparison result.

[0089] The control device for the mixing station of the centralized heating system provided in this embodiment of the invention can execute the control method for the mixing station of the centralized heating system provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects for executing the method. Further functional descriptions of the above modules and units are the same as those in the corresponding embodiments described above, and will not be repeated here.

[0090] Figure 7 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention.

[0091] The following is a detailed reference. Figure 7 This diagram illustrates a suitable structural schematic for implementing an electronic device according to embodiments of the present invention. The electronic device may include a processor (e.g., a central processing unit, graphics processor, etc.) 701, which can perform various appropriate actions and processes based on a program stored in read-only memory (ROM) 702 or a program loaded from memory 708 into random access memory (RAM) 703. The RAM 703 also stores various programs and data required for the operation of the electronic device. The processor 701, ROM 702, and RAM 703 are interconnected via a bus 704. An input / output (I / O) interface 705 is also connected to the bus 704.

[0092] Typically, the following devices can be connected to I / O interface 705: input devices 706 including, for example, touchscreens, touchpads, keyboards, mice, cameras, microphones, accelerometers, gyroscopes, etc.; output devices 707 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; memory devices 708 including, for example, magnetic tapes, hard disks, etc.; and communication devices 709. Communication device 709 allows electronic devices to exchange data via wireless or wired communication with other devices. Although Figure 7 Electronic devices with various devices are shown, but it should be understood that it is not required to implement or have all of the devices shown, and more or fewer devices may be implemented or have instead.

[0093] In particular, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program carried on a non-transitory computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device 709, or installed from a memory 708, or installed from a ROM 702. When the computer program is executed by the processor 701, it performs the functions defined in the control method for the mixing station of the centralized heating system according to embodiments of the present invention.

[0094] Figure 7 The electronic device shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments of the present invention.

[0095] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code. When the software or computer code is accessed and executed by the computer, processor, or hardware, the control method for the mixing station of the centralized heating system shown in the above embodiments is implemented.

[0096] A portion of this invention can be applied as a computer program product, such as computer program instructions, which, when executed by a computer, can invoke or provide the methods and / or technical solutions according to the invention through the operation of the computer. Those skilled in the art will understand that the forms in which computer program instructions exist in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include, but are not limited to: the computer directly executing the instructions, or the computer compiling the instructions and then executing the corresponding compiled program, or the computer reading and executing the instructions, or the computer reading and installing the instructions and then executing the corresponding installed program. Here, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to a computer.

[0097] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A control method for a mixing station in a centralized heating system, characterized in that, The method includes: Based on the target heating temperature of the secondary network, the return water temperature of the secondary network, and the supply water temperature of the primary network of the target centralized heating system, the initial mixing ratio of the mixing station is determined; the primary network is used to provide water at a first temperature, the secondary network is used to provide water at a second temperature, and the mixing station is used to mix the supply water of the primary network and the return water of the secondary network, wherein the first temperature is greater than the second temperature. The load correction coefficient is determined based on the temperature load correction slope coefficient, the ambient temperature, and the standard ambient temperature; the temperature load correction slope coefficient is used to characterize the proportion of building heat load change corresponding to changes in outdoor air temperature. The initial mixing ratio is corrected according to the load correction coefficient to obtain the target mixing ratio, and the opening degree of the primary network valve of the mixing station is controlled according to the target mixing ratio. Based on the target heating temperature of the secondary network, the return water temperature of the secondary network, and the user's heat demand, the total flow rate of the secondary network is determined. The frequency of the circulating pump of the secondary network is adjusted according to the total flow rate of the secondary network until the actual flow rate of the secondary network equals the total flow rate of the secondary network.

2. The method according to claim 1, characterized in that, The determination of the initial mixing ratio of the mixing station based on the target heating temperature of the secondary network, the return water temperature of the secondary network, and the supply water temperature of the primary network of the target centralized heating system includes: The first temperature difference is obtained based on the difference between the target heating temperature of the secondary network and the return water temperature of the secondary network; The second temperature difference is obtained based on the difference between the supply water temperature of the primary network and the return water temperature of the secondary network; The initial mixing ratio of the mixing station is obtained by dividing the first temperature difference by the second temperature difference.

3. The method according to claim 1 or 2, characterized in that, The determination of the load correction coefficient based on the temperature load correction slope coefficient, the ambient temperature, and the standard ambient temperature includes: The third temperature difference is obtained based on the difference between the standard ambient temperature and the external ambient temperature; The first product result is obtained by multiplying the third temperature difference by the temperature load correction slope coefficient; The load correction coefficient is obtained by summing the first product result with a preset value; the preset value is 1.

4. The method according to claim 1 or 2, characterized in that, The step of correcting the initial mixing ratio according to the load correction coefficient to obtain the target mixing ratio, and controlling the opening of the primary network valves of the mixing station according to the target mixing ratio, includes: The target mixing ratio is obtained by multiplying the load correction factor by the initial mixing ratio. The opening degree of the primary network valve of the mixing station is adjusted according to the target mixing ratio.

5. The method according to claim 1 or 2, characterized in that, After controlling the opening degree of the primary network valve of the mixing station according to the target mixing ratio, the method further includes: The real-time secondary network water supply temperature is obtained, and a fourth temperature difference is obtained based on the difference between the target heating temperature of the secondary network and the real-time secondary network water supply temperature. The fourth temperature difference is compared with a preset temperature difference threshold to obtain a comparison result, and the parameters of the proportional-integral-derivative controller are adjusted according to the comparison result.

6. The method according to claim 2, characterized in that, The step of determining the total flow rate of the secondary network based on the target heating temperature of the secondary network, the return water temperature of the secondary network, and the user's heat demand includes: The second product result is obtained by multiplying the first temperature difference, the specific heat capacity of water, and the density of water. The total flow of the secondary network is obtained by dividing the user's heat demand by the product of the second product.

7. A control device for a mixing station in a centralized heating system, characterized in that, The device includes: The initial mixing ratio determination module is used to determine the initial mixing ratio of the mixing station based on the target heating temperature of the secondary network, the return water temperature of the secondary network, and the supply water temperature of the primary network of the target centralized heating system. The primary network is used to provide water at a first temperature, the secondary network is used to provide water at a second temperature, and the mixing station is used to mix the supply water of the primary network and the return water of the secondary network, wherein the first temperature is greater than the second temperature. The correction coefficient determination module is used to determine the load correction coefficient based on the temperature load correction slope coefficient, the external ambient temperature, and the standard ambient temperature; the temperature load correction slope coefficient is used to characterize the proportion of building heat load change corresponding to changes in outdoor air temperature. The target mixing ratio determination module is used to correct the initial mixing ratio according to the load correction coefficient to obtain the target mixing ratio, and to control the opening degree of the primary network valve of the mixing station according to the target mixing ratio. The flow regulation module is used to determine the total flow rate of the secondary network based on the target heating temperature of the secondary network, the return water temperature of the secondary network, and the user's heat demand, and to adjust the frequency conversion frequency of the circulation pump of the secondary network according to the total flow rate of the secondary network until the actual secondary network flow rate is equal to the total flow rate of the secondary network.

8. An electronic device, characterized in that, include: A memory and a processor are communicatively connected, the memory stores computer instructions, and the processor executes the computer instructions to perform the control method for the mixing station of the centralized heating system according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing a computer to execute the control method for the mixing station of the centralized heating system according to any one of claims 1 to 6.

10. A computer program product, characterized in that, Includes computer instructions, said computer instructions being used to cause a computer to execute the control method for the mixing station of the centralized heating system according to any one of claims 1 to 6.

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