Heat exchange station control method and system based on indoor temperature separation technology

Abstract

The present invention discloses a control method and system for a heat exchange station based on indoor temperature separation technology. The method includes creating an actual dynamic mathematical model of the heating system; respectively simulating, through the actual dynamic mathematical model of the heating system, a relationship model between the outdoor temperature and the secondary network supply water temperature of the heat exchange station, and a relationship model between the secondary network circulation flow ratio of the heat exchange station and the outdoor temperature, solar radiation intensity, and indoor heat gain intensity; inputting the real-time detected outdoor temperature value into the two relationship models respectively to calculate the set value of the secondary network supply water temperature for closed-loop compensation control of the heat exchange station, and calculating the secondary network circulation flow of the heat exchange station for open-loop compensation control of the heat exchange station. This method realizes hierarchical control of the indoor temperature, significantly improves the thermal comfort of heat users, and meets the requirements of the indoor temperature control target.

Description

Technical Field

[0001] The present invention relates to the technical field of indoor temperature control for heat users in a central heating system, and particularly relates to a control method and system for a heat exchange station based on indoor temperature separation technology. Background Art

[0002] Currently, the most important goal of a central heating system is to ensure the indoor temperature of heat users. If it is possible to detect the indoor temperature of users in real time and perform local control on the indoor temperature (usually using household control or room-by-room control), the main goal of the heating system can be achieved. However, the subsequent problem is how to achieve supply-demand matching and precise control according to the heat source of the heating system, the heat network structure, and the characteristics of the heat exchange station, and optimize the operation of the system to ensure reasonable operating parameters for the indoor temperature control point.

[0003] However, it is actually very difficult to achieve real-time detection and automatic control of the indoor temperature of all heat users. The main reasons are as follows:

[0004] (1) The hardware cost and equipment maintenance problems of real-time detection of indoor temperature;

[0005] (2) The investment, operation, and maintenance problems of household and room-by-room automatic control;

[0006] (3) The deviation problem between the actual detected value of indoor temperature and the true indoor temperature value;

[0007] (4) The upload and communication interruption problems of real-time detected values of indoor temperature;

[0008] (5) The problem of calculating the average value of indoor temperature;

[0009] (6) The control strategy and control parameter setting problems of indoor temperature;

[0010] (7) The cost performance problem of indoor temperature detection;

[0011] (8) The specific installation location problem of indoor temperature measurement points.

[0012] Due to these reasons above, it is difficult to truly achieve the procurement cost, data detection, true value correction, communication interruption, and control of the indoor temperature of all heat users in a central heating system, and it is necessary to find other alternative methods to approximately obtain the actual indoor temperature of heat users.

[0013] In addition, as a main node in the heat transfer process of the overall heating system, indoor temperature is affected by the operating parameters of the heating system and various interferences. Although from the perspective of system operation, indoor temperature is the only result of the central heating system under a certain determined parameter state (the combined action of system operating parameters and interferences), it is almost an impossible task to accurately calculate the dynamic indoor temperature value of heat users.

[0014] From the perspective of the control accuracy of the centralized heating system, the indoor temperature of heat users does not require very precise control (high-precision control requires a large investment and the cost performance is unreasonable). Usually, a control accuracy of ±0.5 to 1 °C can meet the user's needs. Therefore, studying the dynamic characteristics of the indoor temperature in the heating system under different operating and interference states is not only very necessary for the automatic control of the indoor temperature, but also of great significance for meeting user needs, guiding the reasonable operation of the heating system, and optimizing the system operation, etc. Summary of the Invention

[0015] The purpose of the present invention is to provide a heat exchange station control method and system based on indoor temperature separation technology to achieve hierarchical control of the indoor temperature.

[0016] To achieve the above object, an embodiment of the present invention provides a heat exchange station control method based on indoor temperature separation technology, including:

[0017] S1: Create an actual dynamic mathematical model of the heating system based on the law of conservation of energy and mass of the control volume, the functional relationship between the indoor temperature and the physical parameters of the heating system, the heat gain / loss of the heat transfer process of the control volume, and the dynamic relationship between the net heat stored in each control volume of the heating system and its heat gain and heat loss, where the control volume includes a heat exchange station, the secondary network of the heat exchange station, and building heat users;

[0018] S2: When the indoor temperature is maintained at a preset temperature value, respectively simulate and obtain a relationship model between the outdoor temperature and the supply water temperature of the secondary network of the heat exchange station and a relationship model between the circulation flow ratio of the secondary network of the heat exchange station and the outdoor temperature, solar radiation intensity, and indoor heat gain intensity through the actual dynamic mathematical model of the heating system;

[0019] S3: Input the real-time detected outdoor temperature value into the relationship model between the outdoor temperature and the supply water temperature of the secondary network of the heat exchange station to calculate the set value of the supply water temperature of the secondary network, and perform closed-loop compensation control on the heat exchange station according to the error between the set value of the supply water temperature of the secondary network and the measured value of the supply water temperature of the secondary network;

[0020] S4: Input the real-time detected outdoor temperature value, the average value of the southward solar radiation intensity, and the indoor heat gain intensity into the relationship model between the circulation flow ratio of the secondary network of the heat exchange station and the outdoor temperature, solar radiation intensity, and indoor heat gain intensity to calculate the circulation flow of the secondary network of the heat exchange station, and perform open-loop compensation control on the heat exchange station according to the circulation flow of the secondary network of the heat exchange station.

[0021] According to an embodiment of the present invention, the S1 includes:

[0022] Based on the energy and mass conservation laws of the control volume, the functional relationship between the indoor temperature and the physical parameters of the heating system, the heat gain / loss in the heat transfer process of the control volume, and the dynamic relationship between the net heat stored in each control volume of the heating system and its heat gain and heat loss, an ideal dynamic mathematical model of the heating system is created;

[0023] Adjust the flow rate of the flow regulating valve at the building's thermal inlet to make the secondary network of the heat exchange station in a hydraulically balanced state;

[0024] Conduct an open-loop test on the ideal dynamic mathematical model of the heating system to determine the correctness of the ideal dynamic mathematical model of the heating system under design conditions;

[0025] Verify the steady-state value of the dynamic response of the ideal dynamic mathematical model of the heating system by changing the outdoor temperature and the fuel supply of the heat source to determine the accuracy of the ideal dynamic mathematical model of the heating system under changing outdoor temperatures;

[0026] Analyze the actual operating parameters and design parameters of the heating system to obtain the heat transfer area surplus coefficients of the heat exchangers and terminal heat dissipation devices of the heating system, and input the heat transfer area surplus coefficients of the heat exchangers and terminal heat dissipation devices of the heating system into the ideal dynamic mathematical model of the heating system to obtain the actual dynamic mathematical model of the heating system.

[0027] According to another embodiment of the present invention, the indoor temperature is calculated based on the heat capacity of the control volume of the heating system, the secondary supply and return water temperatures, the circulating flow rate of the heat users, the comprehensive heat transfer coefficient of the heat user heat dissipation devices and the building envelope structure, the heat transfer area surplus coefficient of the heat dissipation devices, the outdoor temperature, solar radiation and indoor heat gain intensity, the heat supply area of the heat users, the heat load index of the heat users and the heat loss coefficient.

[0028] According to another embodiment of the present invention, the heat gain / loss in the heat transfer process of the control volume is expressed as:

[0029]

[0030] where T is the temperature; Q in is the heat gain of the control volume; Q out is the heat loss of the control volume; Const is the integration constant.

[0031] According to another embodiment of the present invention, the dynamic relationship between the net heat stored in each control volume of the heating system and its heat gain and heat loss is expressed as:

[0032]

[0033] where u f is the heat source fuel control variable; G fdis the rated flow rate of the heat source fuel; HV is the fuel calorific value; ηb is the thermal efficiency of the heat source boiler; c w is the specific heat of water; u w1 、u w2 are the flow control variables on the primary and secondary sides of the heat exchange station; T s1 、T r1 are the supply and return water temperatures of the primary network; f x is the surplus coefficient of the heat transfer area of the heat exchanger; U x is the comprehensive heat transfer coefficient of the heat exchanger; LMTD is the logarithmic mean temperature difference of the heat exchanger; m is the coefficient related to the heat transfer coefficient test of the radiator; j is the east, west, and south sides; F win is the area of the external window; i is the building heat user number.

[0034] According to another embodiment of the present invention, the relationship model between the outdoor temperature and the supply water temperature of the secondary network of the heat exchange station is expressed as:

[0035] T s2sp = f1T o 2 + f2T o + f3 ----(3)

[0036] wherein, T s2sp is the set value of the supply water temperature of the secondary network of the heat exchange station; f1 to f3 are calculation coefficients, and T o is the outdoor temperature.

[0037] According to another embodiment of the present invention, the relationship model between the circulation flow ratio of the secondary network of the heat exchange station and the outdoor temperature, solar radiation intensity, and indoor heat gain intensity is expressed as:

[0038] u w2 = f(T o 、q sols 、q intarg ) ----(4)

[0039] wherein, u w2 is the total circulation flow ratio of the secondary network; q sols is the solar radiation intensity in the south direction; q intarg is the average value of the indoor heat gain intensity.

[0040] According to another embodiment of the present invention, the S3 includes:

[0041] Input the real-time detected outdoor temperature value into the relationship model between the outdoor temperature and the supply water temperature of the secondary network of the heat exchange station to calculate the set value of the supply water temperature of the secondary network, and calculate the error between the set value of the supply water temperature of the secondary network and the measured value of the supply water temperature of the secondary network;

[0042] The error between the set value of the secondary network supply water temperature and the measured value of the secondary network supply water temperature is input into the controller algorithm formula to calculate the flow control parameter of the primary side electric regulating valve of the heat exchange station, where the secondary network of the heat exchange station adopts a closed-loop control loop;

[0043] The opening of the electric regulating valve is adjusted by using the flow control parameter of the primary side electric regulating valve of the heat exchange station to perform real-time adjustment on the secondary network supply water temperature.

[0044] According to another embodiment of the present invention, the open-loop compensation control of the heat exchange station based on the secondary network circulation flow of the heat exchange station in S4 is specifically: performing frequency conversion control or intermittent control on the circulating water pump of the heat exchange station.

[0045] On the other hand, the embodiment of the present invention also provides a heat exchange station control system based on indoor temperature separation technology, including:

[0046] A dynamic model creation module, configured to create a dynamic mathematical model of the heating system based on the energy and mass conservation laws of the control volume, the functional relationship between the indoor temperature and the physical parameters of the heating system, the heat gain / loss of the heat transfer process of the control volume, and the dynamic relationship between the net heat stored in each control volume of the heating system and its heat gain and heat loss;

[0047] A compensation model acquisition module, configured to respectively simulate and obtain a relationship model between the outdoor temperature and the secondary network supply water temperature of the heat exchange station and a relationship model between the secondary network circulation flow ratio of the heat exchange station and the outdoor temperature, solar radiation intensity, and indoor heat gain intensity through the dynamic mathematical model of the heating system when the indoor temperature is maintained at a preset temperature value;

[0048] A primary compensation control module, configured to input the real-time detected outdoor temperature value into the relationship model between the outdoor temperature and the secondary network supply water temperature of the heat exchange station to calculate the set value of the secondary network supply water temperature, and perform primary compensation control on the heat exchange station based on the error between the set value of the secondary network supply water temperature and the measured value of the secondary network supply water temperature;

[0049] A secondary compensation control module, configured to input the real-time detected outdoor temperature value, the southward solar radiation intensity, and the average value of the indoor heat gain intensity into the relationship model between the secondary network circulation flow ratio of the heat exchange station and the outdoor temperature, solar radiation intensity, and indoor heat gain intensity to calculate the secondary network circulation flow of the heat exchange station, and perform secondary compensation control on the heat exchange station based on the secondary network circulation flow of the heat exchange station.

[0050] The method of the present invention has the following advantages:

[0051] The heat exchange station control method based on indoor temperature separation technology in the embodiments of the present invention obtains the thermodynamic characteristics of the heating system by creating a dynamic mathematical model of the heating system and simulating the mathematical model. Then, through the analysis of the thermodynamic characteristics of the heating system, the set parameters of the secondary network supply water temperature and the total circulation flow rate of the heat exchange station control system (quality regulation) using the indoor temperature separation technology can be obtained to achieve hierarchical control of the indoor temperature, significantly improve the thermal comfort of heat users, and meet the requirements of the indoor temperature control target. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a schematic flowchart of the heat exchange station control method based on indoor temperature separation technology of the present invention;

[0053] Figure 2 It is a process flow diagram of the physical model of the heating system;

[0054] Figure 3 It is a schematic diagram of the curved surface space among indoor temperature, outdoor temperature, and secondary network supply and return water temperatures;

[0055] Figure 4 It is the test data of the first-level and second-level disturbances in the simulation;

[0056] Figure 5 It is a schematic diagram of the dynamic response of the heating system when the first-level disturbance is constant;

[0057] Figure 6 It is a schematic diagram of the dynamic response of the heating system when the first-level disturbance changes;

[0058] Figure 7 It is a schematic diagram of the dynamic response of the heating system when the first-level and second-level disturbances change simultaneously;

[0059] Figure 8 It is a relationship curve diagram between outdoor temperature and secondary network supply water temperature;

[0060] Figure 9 It is a schematic diagram of the control principle of the heat exchange station based on indoor temperature separation technology;

[0061] Figure 10 It is a schematic diagram of the dynamic response of the heating system during the secondary network supply water temperature compensation control;

[0062] Figure 11 It is a schematic diagram of the dynamic response of the heating system of the indoor temperature separation control technology;

[0063] Figure 12 It is a schematic diagram of the ratio of the total secondary network circulation flow rate of the heating system of the indoor temperature separation control technology;

[0064] Figure 13This is the structural block diagram of the heat exchange station control system based on the indoor temperature separation technology of the present invention. Specific embodiments

[0065] The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention. 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 in conjunction with the drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0066] See Figure 1 As shown, the embodiments of the present invention provide a heat exchange station control method based on the indoor temperature separation technology, including:

[0067] S1: Create an actual dynamic mathematical model of the heating system based on the law of conservation of energy and mass of the control volume, the functional relationship between the indoor temperature and the physical parameters of the heating system, the heat gain / loss of the heat transfer process of the control volume, and the dynamic relationship between the net heat stored in each control volume of the heating system and its heat gain and heat loss, where the control volume includes a heat exchange station, a secondary network of the heat exchange station, and building heat users;

[0068] S2: When the indoor temperature is maintained at a preset temperature value, respectively simulate and obtain the relationship model between the outdoor temperature and the supply water temperature of the secondary network of the heat exchange station and the relationship model between the circulation flow ratio of the secondary network of the heat exchange station and the outdoor temperature, solar radiation intensity, and indoor heat gain intensity through the actual dynamic mathematical model of the heating system;

[0069] S3: Input the real-time detected outdoor temperature value into the relationship model between the outdoor temperature and the supply water temperature of the secondary network of the heat exchange station to calculate the set value of the supply water temperature of the secondary network, and perform closed-loop compensation control on the heat exchange station based on the error between the set value of the supply water temperature of the secondary network and the measured value of the supply water temperature of the secondary network;

[0070] S4: Input the real-time detected outdoor temperature value, the average value of the southward solar radiation intensity, and the indoor heat gain intensity into the relationship model between the circulation flow ratio of the secondary network of the heat exchange station and the outdoor temperature, solar radiation intensity, and indoor heat gain intensity to calculate the circulation flow of the secondary network of the heat exchange station, and perform open-loop compensation control on the heat exchange station based on the circulation flow of the secondary network of the heat exchange station.

[0071] The interferences in the current heating system mainly come from: outdoor temperature, solar radiation and indoor heat gain. Usually, the outdoor temperature plays a major role, while solar radiation and indoor heat gain play a minor role. According to the intensity of the interference, the interference can be divided into two levels: the first-level interference is the outdoor temperature; the second-level interference is solar radiation and indoor heat gain. At present, the heating areas of the vast majority of centralized heating systems in northern China are all greater than 1 million m 2 ² or above. The system structure adopts an indirect connection method, that is, the system consists of a heat source, a primary network, a heat exchange station, a secondary network and heat users. The basic unit directly related to the indoor temperature of heat users can be defined as consisting of a heat exchange station, a secondary network and heat users. Therefore, the research on the indoor temperature of heat users is suitable to be based on the heat exchange station and its downstream as the basic unit (so in this embodiment, the control volume mainly involves the heat exchange station, the secondary network of the heat exchange station and the building heat users), and the heat exchange station is used as the key node for automatic control, which not only simplifies very complex problems, but also improves the practicality and practical application value of the research results.

[0072] In the actual operation control process of the centralized heating system, with the change of the outdoor temperature (the first-level interference), in order to meet the heat supply and demand matching between the heat exchange station and heat users, the heat exchange station changes the water temperature (secondary supply water temperature or secondary average temperature) while keeping the secondary network circulation flow rate unchanged (constant flow rate) to ensure the indoor temperature of heat users. However, usually, the heat matching control of the heat exchange station does not consider the dynamic influence of the second-level interference on the indoor temperature. Therefore, the actual operation control result causes large fluctuations in the indoor temperature, which not only affects the thermal comfort of heat users, but also causes overheating of the indoor temperature, waste of heat supply and system investment, and reduces the economic efficiency of the heating system.

[0073] In view of this actual situation, for the indoor temperature control parameters and influencing factors of the heating system, in this embodiment, the indoor temperature and the heat exchange station control are separated according to the level of the interference intensity, which not only grasps the main contradiction, but also does not ignore the secondary contradiction, in order to reduce the system energy consumption level while improving and enhancing the heating quality.

[0074] In this embodiment, through the simulation analysis of the dynamic mathematical model of the heating system, the interferences affecting the indoor temperature are decomposed and compensated, and are used in the heat exchange station control system to achieve the purpose of indoor temperature control.

[0075] The heat exchange station control method based on the indoor temperature separation technology in the embodiment of the present invention creates a dynamic mathematical model of the heating system and simulates the mathematical model, so as to obtain the thermodynamic characteristics of the heating system; then through the analysis of the thermodynamic characteristics of the heating system, the set parameters of the secondary network supply water temperature and the total circulation flow rate of the heat exchange station control system (quality regulation) adopting the indoor temperature separation technology can be obtained to realize the hierarchical control of the indoor temperature, significantly improve the thermal comfort of heat users, and meet the requirements of the indoor temperature control target.

[0076] In some embodiments, S1 in the heat exchange station control method based on the indoor temperature separation technology of the present invention specifically includes:

[0077] S101: Create an ideal dynamic mathematical model of the heating system based on the law of conservation of energy and mass of the control volume, the functional relationship between the indoor temperature and the physical parameters of the heating system, the heat gain / loss in the heat transfer process of the control volume, and the dynamic relationship between the net heat stored in each control volume of the heating system and its heat gain and heat loss;

[0078] S102: Adjust the flow rate of the flow regulating valve at the thermal inlet of the building to make the secondary network of the heat exchange station in a hydraulically balanced state;

[0079] S103: Conduct an open-loop test on the ideal dynamic mathematical model of the heating system to determine the correctness of the ideal dynamic mathematical model of the heating system under the design conditions;

[0080] S104: Test the steady-state value of the dynamic response of the ideal dynamic mathematical model of the heating system by changing the outdoor temperature and the heat source fuel supply to determine the accuracy of the ideal dynamic mathematical model of the heating system under the change of outdoor temperature;

[0081] S105: Analyze the actual operation parameters and design parameters of the heating system to obtain the heat transfer area surplus coefficients of the heat exchanger and the terminal heat dissipation device of the heating system, and input the heat transfer area surplus coefficients of the heat exchanger and the terminal heat dissipation device of the heating system into the ideal dynamic mathematical model of the heating system to obtain the actual dynamic mathematical model of the heating system.

[0082] In some embodiments, the indoor temperature (T z ) in the heat exchange station control method based on the indoor temperature separation technology of the present invention is calculated according to the heat capacity (C) of the control volume of the heating system, the secondary supply and return water temperatures (T s2 , T r2 ), the circulating flow rate of the heat user (G2), the comprehensive heat transfer coefficients of the heat user heat dissipation device and the building envelope structure (U ht , U en ), the heat transfer area surplus coefficient (f ht ), the outdoor temperature (T o ), the solar radiation and the indoor heat gain intensity (q sol , q int ), the heating area of the heat user (F), the heat load index of the heat user (q F ) and the heat loss coefficient (f h ). The relationships between the parameters are shown in the following formulas (1) and (2).

[0083] In some embodiments, the heat gain / loss of the heat transfer process of the control volume in the heat exchange station control method based on the indoor temperature separation technology of the present invention is expressed as:

[0084]

[0085] where T is the temperature, in °C; Q in is the heat gain of the control volume, in W; Q out is the heat loss of the control volume, in W; Const is the integration constant.

[0086] In some embodiments, the dynamic relationship between the net heat stored in each control volume of the heat supply system and its heat gain and heat loss in the heat exchange station control method based on the indoor temperature separation technology of the present invention is expressed as:

[0087]

[0088] where u f is the heat source fuel control variable; G fd is the rated flow rate of the heat source fuel, in Kg / s; HV is the calorific value of the fuel, in J / kg; ηb is the thermal efficiency of the heat source boiler; c w is the specific heat of water, in J / (Kg°C); u w1 and u w2 are the flow control variables of the primary and secondary sides of the heat exchange station; T s1 and T r1 are the supply and return water temperatures of the primary network, in °C; f x is the heat transfer area surplus coefficient of the heat exchanger; U x is the comprehensive heat transfer coefficient of the heat exchanger, in W / °C; LMTD is the logarithmic mean temperature difference of the heat exchanger, in °C; m is the coefficient related to the heat transfer coefficient test of the radiator; j is for the east, west, and south sides; F win is the external window area, in m 2 ; i is the building heat user number.

[0089] Specifically, in a conventional indirectly connected central heating system, the heat required for heat source production is first transferred to the heat exchange station through the primary network; then the heat exchange station transfers the heat carried by the high-temperature water to the low-temperature water on the secondary side of the heat exchanger through the heat exchanger to raise its temperature; again, the heat dissipation device of the heat user receives the hot water heated by the secondary network and dissipates heat to the indoor air through the terminal heat dissipation device to make the indoor temperature reach the control temperature; finally, heat exchange occurs between the indoor situation and the outdoor environment, and the stability and control target of the indoor temperature are maintained by changing the heat supply amount entering the heat user from the secondary network under the condition of continuous change of the outdoor environment. After the hot water in the heat network releases heat, it enters the heat exchanger of the heat exchange station and the heat source boiler respectively through the secondary network and the return water of the primary network with reduced temperature, and is reheated, and the heat conversion sequence circulates in turn.

[0090] In view of the difficulty in monitoring the indoor temperature of each heat user, for the convenience of creating a dynamic model, practical on-site application, and dynamic model analysis, the indoor temperatures of heat users in each building are virtually regarded as a single indoor temperature using the lumped parameter method. In this way, each heat user (building) can be represented by a single indoor temperature.

[0091] Based on the laws of conservation of mass and energy, a complete dynamic mathematical model of the heating system is created. First, a physical model of the central heating system is established, and its process flow diagram is shown in Figure 2 , to avoid the cumbersome calculation and creation process of the mathematical model and maintain the main characteristics of the heating system, the physical model and mathematical model are simplified as necessary. The basic formula of the dynamic mathematical model is shown in the above formula (1). Formula (1) clarifies the dynamic relationship between the net heat stored in each control volume of the heating system and its heat gain and heat loss.

[0092] For an indirectly connected central heating system, according to the heat transfer process and heat storage capacity, the heating system is usually divided into the following control volumes: the heat source boiler, the heat exchanger, the terminal heat dissipation device of the heat user, and the indoor air. The heat gain (Q in ) of the control volume is the heat released by fuel combustion, the heat released on the primary side of the heat exchanger, the heat obtained by the terminal heat dissipation device from the hot water, solar radiation, and indoor heat gain, which varies according to the specific control volume. The heat loss (Q out ) of the control volume is the heat carried by the heat source boiler from the primary return water to the supply water, the heat carried by the heat exchanger from the secondary return water to the supply water, the heat released by the terminal heat dissipation device of the heat user into the indoor air, and the heat dissipated by the indoor air to the outdoor environment. Similarly, its calculation is related to the selected control volume.

[0093] The static equations of the heat transfer and conversion process are shown in the above formula (2), where Q is the heat gain or heat loss related to the heat transfer process of the control volume.

[0094] 1. The principles for creating the ideal dynamic mathematical model of the heating system are as follows:

[0095] a) The laws of conservation of energy and mass of the control volume;

[0096] b) The dynamic heat transfer process of formula (1);

[0097] c) The influencing factors of the indoor temperature of the heat user itself;

[0098] d) The heat gain and heat loss of the control volume of formula (2).

[0099] Based on the above basis, the ideal dynamic mathematical model of the overall heating system consists of 9 dynamic equations, which respectively describe T s1 , T r1 , T s2 , Tr2i , T zi The dynamic change process of and the relationship between the net heat, heat release, and heat loss stored in the corresponding control volume. In the ideal dynamic mathematical model, the primary and secondary network circulation flows are the designed flows, and the heat transfer area of the heat exchanger and the heat dissipation area of the heat dissipation device at the end of the heat user do not include the heat transfer area surplus coefficient, i.e., f x = 1 and f ht = 1. At the same time, the influence of solar radiation and indoor heat gain interference on the system operation parameters is not considered.

[0100] The actual dynamic mathematical model is derived from the ideal mathematical model. The actual dynamic model includes the heat transfer area surplus coefficient of the heat exchanger (f x ≠1), the heat transfer area surplus coefficient of the heat dissipation device at the end of the heat user (f ht ≠1), the primary network circulation flow control variable (u w1 ), and the secondary network flow control variable (u w2i ). When simulating the indoor temperature of the heat user, it is necessary to ensure that the secondary network between the heat exchange station and the heat user is in a hydraulic balance state. Therefore, the flow of the flow regulating valve at the building thermal inlet is adjusted to meet the prerequisite of the hydraulic balance of the secondary network during indoor temperature simulation;

[0101] 2. Through the open-loop test of the ideal dynamic mathematical model of the heating system (a method to obtain the dynamic relationship between the input and output of the heating system), it can be seen that at the designed outdoor temperature and the designed circulation flow of the system, by adjusting the fuel supply of the heat source, the indoor temperature of the heat user (Buildings 1 - 3#) and the supply and return water temperatures of the heating system can reach the designed parameters, indicating that the dynamic model of the heating system is correct under the designed working conditions;

[0102] For the ideal dynamic mathematical model, by changing the outdoor temperature and the fuel supply of the heat source and testing the steady-state value of the dynamic response of the dynamic mathematical model, the indoor temperature of the user and the supply and return water temperatures of the heating system are both reasonable values, indicating that the ideal dynamic model also has accuracy under the condition of changing outdoor temperature;

[0103] Based on the actual operation parameters and design parameters of the heating system, through data analysis and calculation, the heat transfer area surplus coefficients of the heat exchanger and the end heat dissipation device of the actual system are obtained. Substituting this surplus coefficient into the ideal dynamic model, the dynamic mathematical model of the actual heating system is obtained. Using the dynamic mathematical model of the actual system and inputting different parameters (heat source fuel control variable, actual circulation flows of the primary and secondary networks, and outdoor temperature), observing the output parameters of the actual dynamic model and comparing and contrasting them with the operation parameters of the actual heating system, it shows that the error between the steady-state value output by the dynamic model and the measured operation parameters of the actual heating system is less than 5%, indicating that the created dynamic mathematical model of the actual heating system has sufficient accuracy and can be used for system dynamic simulation research.

[0104] Therefore, based on the law of conservation of energy and mass, the actual dynamic mathematical model of the central heating system created has corresponding accuracy and can be used for the dynamic simulation and mapping of the actual heating system.

[0105] 3. Operating Characteristics of Heat Exchange Stations Based on First-Order Interference

[0106] Through the simulation of the actual dynamic mathematical model of the heating system, the supply and return water temperature characteristics of the heat exchange station under different outdoor and indoor temperatures can be obtained. The simulation results are shown in Table 1. The simulation conditions are that the actual circulating flow rate of the system is the designed flow rate, and solar radiation and indoor heat gain are not considered.

[0107] Table 1 Supply and Return Water Temperatures of the Secondary Network of Heat Exchange Stations at Different Indoor and Outdoor Temperatures

[0108] Outdoor temperature, °C 5 0 -5 -10 -15 -20 Indoor temperature, °C Secondary water supply temperature, °C 34.3 39.3 44.2 48.8 53.3 57.7 18 Secondary return water temperature, °C 26.2 28.1 29.7 31.2 32.6 33.9 18 Secondary water supply temperature, °C 38.4 43.2 47.9 52.6 57 61.5 20 Secondary return water temperature, °C 29 30.7 32.3 33.8 35.1 36.4 20 Secondary water supply temperature, °C 42.4 47.2 51.9 56.4 60.8 65.1 22 Secondary return water temperature, °C 31.7 33.4 35 36.4 37.6 38.8 22

[0109] Among them, the curved surface space among the indoor temperature, outdoor temperature, and supply and return water temperatures of the secondary network is as Figure 3 shown.

[0110] The interference states used for simulation are:

[0111] (1) Simulation time range: 2 consecutive days

[0112] (2) First-order and second-order interferences within the simulation time range

[0113] First-order interference: The maximum and minimum values are -4°C and -15°C respectively;

[0114] Second-order interference (solar radiation): The maximum and minimum values are 157 W / m 2 and 0 W / m 2 ;

[0115] Second-order interference (indoor heat gain): The maximum and minimum values are 6.5 W / m 2 and 3.7 W / m 2 ;

[0116] The outdoor temperature and the intensity of additional heat gains (solar radiation and indoor heat gain) for two consecutive days are shown in Figure 4 . Note that only the south-facing solar radiation monitoring data are given in this example, Figure 4 (b) The values shown in the indoor heat gain curve are 10 times the actual values (for convenient data display).

[0117] 3.1 Dynamic Response of Operating Parameters of Heating System with Constant First-Order Interference

[0118] (1) Simulation Conditions

[0119] The outdoor temperature is -10°C. The secondary network achieves hydraulic balance and operates at a constant flow rate. The heat source fuel ratio is 0.65 (the heat source fuel ratio is the actual fuel supply / the rated fuel supply).

[0120] (2) Simulation results

[0121] Using the actual dynamic mathematical model for simulation, the indoor temperatures of 3 users (Buildings 1 - 3#) are 19.8°C, 19.9°C, and 19.8°C respectively. The total supply and return water temperatures at the outlet of the secondary network of the heat exchange station are 52.2°C and 33.5°C respectively. The return water temperatures of the 3 users (buildings) in the secondary network are 30.2°C, 33.0°C, and 35.9°C respectively. The reason for the different return water temperatures of the building secondary network is due to the difference in the thermal characteristics of the buildings. The dynamic response of the heating system when the primary disturbance is constant is shown in Figure 5 .

[0122] 3.2 Dynamic response of the operating parameters of the heating system when the primary disturbance changes

[0123] (1) Simulation conditions

[0124] The outdoor temperature changes. The secondary network achieves hydraulic balance and operates at a constant flow rate. The heat source fuel ratio is 0.65.

[0125] (2) Simulation results

[0126] When the heat source fuel ratio remains fixed (0.65), without considering the influence of the initial value of the dynamic mathematical model (the first 10 hours), under different outdoor temperatures, the system dynamic response is shown in Figure 6 . As shown in the figure, the range of the dynamic response of the indoor temperature is 16.8 - 24.1°C, and the change range of the building return water temperature is 28.4 - 39.8°C. The dynamic response results imply that in order to maintain the indoor temperature within a reasonable range, it is necessary to control the water temperature (supply water temperature or secondary average temperature) of the heat exchange station.

[0127] 3.3 Dynamic response of the operating parameters of the heating system when the primary and secondary disturbances change simultaneously

[0128] (1) Simulation conditions

[0129] The primary and secondary disturbances change. The secondary network achieves hydraulic balance and operates at a constant flow rate. The heat source fuel ratio is 0.5.

[0130] (2) Simulation results

[0131] When the heat source fuel ratio remains unchanged (0.5), without considering the influence of the initial value of the dynamic mathematical model (the first 10 hours), under different outdoor temperatures, the system dynamic response is shown in Figure 7 . As Figure 7As shown, the dynamic response range of the indoor temperature is 13.5 - 30.7 °C, and the change range of the building return water temperature is 23.7 - 43.4 °C. The dynamic response results show that the deviation between the indoor temperature and the building return water temperature is further enlarged, and appropriate control needs to be carried out at the heat exchange station to compensate for the influence of interference on the system operation.

[0132] In summary, the interference existing in the heating system has a great influence on the system operation parameters. The influence of the primary interference on the system operation is greater than that of the secondary interference on the system operation parameters; after the superposition of the primary and secondary interferences, the fluctuations of the indoor temperature and the building return water temperature are intensified, and more measures need to be taken to control the indoor temperature; from the dynamic simulation results of the influence of interference on the indoor temperature, it is difficult to obtain good results by only adopting one heat exchange station control strategy to improve the indoor temperature change range and control accuracy; it is proposed to adopt the indoor temperature separation technology to decompose the comprehensive superposition effect of interference on the indoor temperature, and satisfactory control accuracy is expected to be obtained.

[0133] In some embodiments, the relationship model between the outdoor temperature and the secondary network supply water temperature of the heat exchange station in the heat exchange station control method based on the indoor temperature separation technology of the present invention is expressed as:

[0134] T s2sp = f1T o 2 + f2T o + f3 ----(3)

[0135] Wherein, T s2sp is the set value of the secondary network supply water temperature of the heat exchange station; f1 - f3 are calculation coefficients, and To is the outdoor temperature.

[0136] In some embodiments, the relationship model between the secondary network circulation flow ratio of the heat exchange station and the outdoor temperature, solar radiation intensity, and indoor heat gain intensity in the heat exchange station control method based on the indoor temperature separation technology of the present invention is expressed as:

[0137] u w2 = f(T o 、q sols 、q intarg ) ----(4)

[0138] Wherein, u w2 is the total secondary network circulation flow ratio; q s o ls is the southward solar radiation intensity, W / m 2 ; q intarg is the average indoor heat gain intensity, W / m 2 .

[0139] The control of the indoor temperature of a building is actually the dynamic supply-demand matching control of the heat in the heat exchange station. The output heat of the heat exchange station can be jointly adjusted by the secondary network temperature and the circulation flow rate to achieve the (quasi) optimal operation of the heat exchange station based on quality regulation. The prerequisite for realizing the quality regulation of the heat exchange station is to obtain the set parameters for controlling the output water temperature of the heat exchange station (such as the secondary network supply water temperature) and the secondary network circulation flow rate. In this embodiment, through the simulation analysis of the actual dynamic mathematical model of the heating system, the disturbances affecting the indoor temperature are decomposed and compensated, and are used in the control system of the heat exchange station to achieve the purpose of indoor temperature control.

[0140] First, the supply water temperature of the secondary network is used to compensate for the first-level disturbance:

[0141] When maintaining the indoor temperature at 20 °C, the relationship curve between the outdoor temperature and the secondary network supply water temperature can be obtained through the simulation of the actual dynamic mathematical model, as shown in Figure 8 . Figure 8 The outdoor temperature (first-level disturbance) compensation setting parameter for the secondary network supply water temperature of the heat exchange station control system can also be calculated using the above formula (3). In this example, f1, f2, and f3 are -0.0019, -0.9524, and 43.2064 respectively.

[0142] Secondly, the secondary network circulation flow rate is used to compensate for the second-level disturbance:

[0143] Through the simulation of the actual dynamic mathematical model of the heating system, when maintaining the indoor temperature at 20 °C, the relationship between the secondary network circulation flow rate ratio (actual circulation flow rate / designed circulation flow rate) and the outdoor temperature, solar radiation intensity, and indoor heat gain intensity is shown in the above formula (4). For calculating the system control parameters, the solar radiation intensity (east, west, and south directions) and the indoor heat gain intensity data are simplified to the south solar radiation intensity and the average value of the indoor heat gain intensity. The indoor heat gain intensity is determined according to the specific nature of the heat user and the corresponding relationship is simulated (not the detected value). It should be noted that the outdoor temperature is included in formula (4) because when directly controlling with the second-level disturbance, the fluctuation of the secondary network circulation flow rate is relatively large (caused by the large fluctuation of solar radiation). To improve the stability of the circulation flow rate control, the outdoor temperature is added for comprehensive compensation calculation, which can effectively reduce the fluctuation amplitude of the circulation flow rate.

[0144] In some embodiments, in the heat exchange station control method based on the indoor temperature separation technology of the present invention, S3 specifically includes:

[0145] S301: Input the real-time detected outdoor temperature value into the relationship model between the outdoor temperature and the secondary network supply water temperature of the heat exchange station to calculate the set value of the secondary network supply water temperature, and calculate the error between the set value of the secondary network supply water temperature and the measured value of the secondary network supply water temperature;

[0146] S302: Input the error between the set value of the secondary network water supply temperature and the measured value of the secondary network water supply temperature into the controller algorithm formula to calculate the flow control parameter of the primary side electric control valve of the heat exchange station, where the secondary network of the heat exchange station adopts a closed-loop control loop;

[0147] S303: Adjust the opening of the electric control valve by using the flow control parameter of the primary side electric control valve of the heat exchange station to adjust the secondary network water supply temperature in real time.

[0148] Optionally, in the heat exchange station control method based on the indoor temperature separation technology according to the embodiments of the present invention, the open-loop compensation control of the heat exchange station based on the secondary network circulation flow of the heat exchange station is specifically: performing variable frequency control or intermittent control on the circulating water pump of the heat exchange station.

[0149] The control schematic diagram of the quality regulation (quasi) optimization control strategy of the heat exchange station based on the indoor temperature separation technology is shown in Figure 9 . As Figure 9 shown, for the primary interference compensation control, the secondary network water supply temperature of the heat exchange station adopts a closed-loop control loop (controller C1). The set value of the secondary network water supply temperature (T o ) is calculated through the primary interference (T s2sp ) and compared with the measured value of the secondary network water supply temperature (T s2 ) to obtain the error. The flow control parameter (u w1 ) of the primary side electric control valve of the heat exchange station is obtained by using the typical controller control algorithm (see the following formula (5)), and the opening of the electric control valve is adjusted to adjust the secondary network water supply temperature in real time. For the secondary interference compensation control, the secondary network circulation flow of the heat exchange station is obtained through comprehensive calculation of the interference parameters, and an open-loop control strategy is adopted to implement variable frequency control (or appropriate intermittent control) on the circulating water pump of the heat exchange station. Therefore, the quality regulation of the heat exchange station can be realized through the closed-loop primary interference compensation and the open-loop secondary interference compensation.

[0150]

[0151] Among them, k p and k i are the proportional and integral constants in the typical controller; t is the running time, with the unit of s.

[0152] Currently, the commonly used control strategy for heat exchange stations is the control based on the secondary network water supply temperature, and the secondary network operates with a constant flow. In this embodiment, the operation control strategy of the quality regulation heat exchange station based on the indoor temperature separation technology is applied to compare the dynamic response differences and energy-saving situations of these two control strategies during operation.

[0153] Secondary network water supply temperature control:

[0154] When adopting this control strategy, the dynamic change range and average value of the indoor temperature are 21~30.1°C and 20.3°C respectively; the average value of the heat source fuel supply is 0.587; the change range of the return water temperature of the building's secondary network is 31.1~41.9°C; the total circulation flow ratio of the heat exchange station is 1. The dynamic response of the heating system when the secondary network supply water temperature compensation control is adopted in the heating system is shown in Figure 10 。

[0155] Control based on indoor temperature separation technology:

[0156] When adopting this control strategy, the dynamic change range and average value of the indoor temperature are 17.3~22.8°C and 20.1°C respectively. For 90% or more of the time, the indoor temperatures of 3 buildings (heat users) meet the range of 20±1°C of their indoor temperature design values, and the thermal comfort of heat users can be significantly improved for most of the time; the average value of the heat source fuel supply is 0.528; the change range of the return water temperature of the building's secondary network is 15.4~35°C (the actual return water temperature will be higher than 20°C); the total circulation flow ratio of the heat exchange station is 0.585. The dynamic response of the heating system when the indoor temperature separation control technology is adopted in the heating system is shown in Figure 11 。The total circulation flow ratio (u w2 ) of this control strategy is shown in Figure 12 。

[0157] Calculation of energy saving rate:

[0158] According to the dynamic simulation of the above two control strategies, the heat consumption of the heat exchange station, the circulation flow of the secondary network and the power consumption ratio can be obtained. The power consumption is calculated based on the cubic relationship between the flow and the power. The calculation of the energy saving rate is shown in Table 2.

[0159] Table 2 Calculation of the energy saving rate of two control strategies

[0160]

[0161] As can be seen from Table 2, compared with the conventional method that only adopts the secondary network supply water temperature control, the heat saving rate and power saving rate of the control strategy using the indoor temperature separation technology are 10.1% and 80% respectively.

[0162] To sum up, it can be seen that: (1) Simply adopting the secondary network supply water temperature control of the heat exchange station cannot meet the thermal comfort requirements of heat users. Because the secondary interference is not effectively compensated, the fluctuation amplitude of the indoor temperature is too large; (2) The control strategy of the heat exchange station using the indoor temperature separation technology can significantly improve the heating quality of heat users, meet the user requirements for most of the time, and at the same time, the average value of the indoor temperature also meets the control target requirements; (3) When the control strategy using the indoor temperature separation technology meets the user's heating quality, it reduces the heat consumption of the heat exchange station by 10% and the circulation flow of the heat exchange station by 41.5% (equivalent to more than 70% of the corresponding power saving).

[0163] Therefore, the control strategy of the heat exchange station based on the indoor temperature separation technology is of great significance. By creating a dynamic mathematical model of the heating system and simulation technology, the thermodynamic characteristics of the heating system can be obtained. Through the analysis of the thermodynamic characteristics of the heating system, the set parameters of the secondary network supply water temperature and the total circulation flow rate of the heat exchange station control system (quality regulation) using the indoor temperature separation technology can be obtained. The heat exchange station control system using the indoor temperature separation technology can significantly improve the thermal comfort of heat users and meet the requirements of the indoor temperature control target. The dynamic simulation results show that the heat exchange station control system using the indoor temperature separation technology can obtain a heat saving rate of 10% and an electricity saving rate of more than 70% while ensuring the heating quality. The heat exchange station control system using the indoor temperature separation technology is estimated to save 2 - 3 yuan / m 2 of the heating operation cost under the current heating cost framework, and can obtain significant social, economic, environmental and management benefits. The heat exchange station control system based on the indoor temperature separation technology is beneficial to implementation and promotion due to the simple acquisition of control parameter set values and the combined automatic operation of the heat exchange station, and promotes the early realization of the "dual carbon" and "dual reduction" goals.

[0164] On the other hand, as shown in Figure 13 the embodiment of the present invention also provides a heat exchange station control system 1 based on the indoor temperature separation technology, including:

[0165] A dynamic model creation module 10, configured to create a dynamic mathematical model of the heating system based on the energy and mass conservation laws of the control volume, the functional relationship between the indoor temperature and the physical parameters of the heating system, the heat gain / loss of the heat transfer process of the control volume, and the dynamic relationship between the net heat stored in each control volume of the heating system and its heat gain and heat loss;

[0166] A compensation model acquisition module 20, configured to respectively simulate and obtain a relationship model between the outdoor temperature and the secondary network supply water temperature of the heat exchange station and a relationship model between the secondary network circulation flow ratio of the heat exchange station and the outdoor temperature, solar radiation intensity, and indoor heat gain intensity through the dynamic mathematical model of the heating system when the indoor temperature is maintained at a preset temperature value;

[0167] A primary compensation control module 30, configured to input the real-time detected outdoor temperature value into the relationship model between the outdoor temperature and the secondary network supply water temperature of the heat exchange station to calculate the set value of the secondary network supply water temperature, and perform primary compensation control on the heat exchange station according to the error between the set value of the secondary network supply water temperature and the measured value of the secondary network supply water temperature;

[0168] The secondary compensation control module 40 is configured to input the real-time detected outdoor temperature value, the southward solar radiation intensity, and the average value of the indoor heat gain intensity into the relationship model between the secondary network circulation flow ratio of the heat exchange station, the outdoor temperature, the solar radiation intensity, and the indoor heat gain intensity to calculate the secondary network circulation flow of the heat exchange station, and perform secondary compensation control on the heat exchange station according to the secondary network circulation flow of the heat exchange station.

[0169] Although the present invention has been described in detail with general descriptions and specific embodiments above, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A control method for a heat exchange station based on indoor temperature separation technology, characterized in that, Including: S1: Create an actual dynamic mathematical model of the heating system based on the energy and mass conservation laws of the control volume, the functional relationship between the indoor temperature and the physical parameters of the heating system, the heat gain / loss of the heat transfer process of the control volume, and the dynamic relationship between the net heat stored in each control volume of the heating system and its heat gain and heat loss. Among them, the control volume includes the heat exchange station, the secondary network of the heat exchange station, and the building heat users; S2: When the indoor temperature is maintained at a preset temperature value, respectively simulate and obtain the relationship model between the outdoor temperature and the supply water temperature of the secondary network of the heat exchange station and the relationship model between the circulation flow ratio of the secondary network of the heat exchange station and the outdoor temperature, solar radiation intensity, and indoor heat gain intensity through the actual dynamic mathematical model of the heating system; S3: Input the real-time detected outdoor temperature value into the relationship model between the outdoor temperature and the supply water temperature of the secondary network of the heat exchange station to calculate the set value of the supply water temperature of the secondary network, and perform closed-loop compensation control on the heat exchange station according to the error between the set value of the supply water temperature of the secondary network and the measured value of the supply water temperature of the secondary network; S4: Input the real-time detected outdoor temperature value, the southward solar radiation intensity, and the average value of the indoor heat gain intensity into the relationship model between the circulation flow ratio of the secondary network of the heat exchange station and the outdoor temperature, solar radiation intensity, and indoor heat gain intensity to calculate the circulation flow of the secondary network of the heat exchange station, and perform open-loop compensation control on the heat exchange station according to the circulation flow of the secondary network of the heat exchange station; Among them, the specific content of S3 includes: Input the real-time detected outdoor temperature value into the relationship model between the outdoor temperature and the supply water temperature of the secondary network of the heat exchange station to calculate the set value of the supply water temperature of the secondary network, and calculate the error between the set value of the supply water temperature of the secondary network and the measured value of the supply water temperature of the secondary network; Input the error between the set value of the supply water temperature of the secondary network and the measured value of the supply water temperature of the secondary network into the controller algorithm formula to calculate the flow control parameter of the electric regulating valve on the primary side of the heat exchange station. Among them, the secondary network of the heat exchange station adopts a closed-loop control loop; Use the flow control parameter of the electric regulating valve on the primary side of the heat exchange station to adjust the opening of the electric regulating valve to perform real-time adjustment on the supply water temperature of the secondary network; The open-loop compensation control of the heat exchange station according to the circulation flow of the secondary network of the heat exchange station in S4 is specifically: perform variable frequency control or intermittent control on the circulation water pump of the heat exchange station.

2. The heat exchange station control method based on the indoor temperature separation technology according to claim 1, wherein The S1 includes: Create an ideal dynamic mathematical model of the heating system based on the energy and mass conservation laws of the control volume, the functional relationship between the indoor temperature and the physical parameters of the heating system, the heat gain / loss of the heat transfer process of the control volume, and the dynamic relationship between the net heat stored in each control volume of the heating system and its heat gain and heat loss; Adjust the flow of the flow regulating valve at the building thermal inlet to make the secondary network of the heat exchange station in a hydraulic balance state; Conduct an open-loop test on the ideal dynamic mathematical model of the heating system to determine the correctness of the ideal dynamic mathematical model of the heating system under the design conditions; Test the dynamic response steady-state value of the ideal dynamic mathematical model of the heating system by changing the outdoor temperature and the heat source fuel supply to determine the accuracy of the ideal dynamic mathematical model of the heating system under the change of the outdoor temperature; Based on the analysis of the actual operation parameters and design parameters of the heating system, the heat transfer area surplus coefficient of the heat exchanger and the terminal heat dissipation device of the heating system is obtained, and the heat transfer area surplus coefficient of the heat exchanger and the terminal heat dissipation device of the heating system is input into the ideal dynamic mathematical model of the heating system to obtain the actual dynamic mathematical model of the heating system.

3. The heat exchange station control method based on indoor temperature separation technology according to claim 2, wherein, The indoor temperature is calculated based on the heat capacity of the control volume of the heating system, the secondary supply and return water temperatures, the circulating flow rate of the heat user, the comprehensive heat transfer coefficient of the heat user's heat dissipation device and the building envelope structure, the heat transfer area surplus coefficient of the heat dissipation device, the outdoor temperature, the solar radiation and the indoor heat gain intensity, the heating area of the heat user, the heat load index of the heat user and the heat loss coefficient.

4. The heat exchange station control method based on the indoor temperature separation technology according to claim 3, characterized in that, The heat gain / loss of the heat transfer process of the control volume is expressed as: where T is the temperature; Q in is the heat gain of the control volume; Q out is the heat loss of the control volume; Const is the integration constant.

5. The heat exchange station control method based on indoor temperature separation technology according to claim 4, characterized in that The dynamic relationship between the net heat stored in each control volume of the heating system and its heat gain and heat loss is expressed as: Among them, u f is the heat source fuel control variable; G fd is the rated flow rate of the heat source fuel; HV is the calorific value of the fuel; η b is the thermal efficiency of the heat source boiler; c w is the specific heat of water; u w1 and u w2 are the flow control variables on the primary and secondary sides of the heat exchange station; T s1 and T r1 are the supply and return water temperatures of the primary network; f x is the surplus coefficient of the heat transfer area of the heat exchanger; U x is the comprehensive heat transfer coefficient of the heat exchanger; LMTD is the logarithmic mean error of the heat exchanger; m is the coefficient related to the heat transfer coefficient test of the radiator; j is the east, west, and south sides; F win is the area of the external window; i is the building heat user number.

6. The heat exchange station control method based on the indoor temperature separation technology according to claim 5, characterized in that, The relationship model between the outdoor temperature and the secondary network supply water temperature of the heat exchange station is expressed as: T s2sp = f1T o 2 + f2T o + f3 ----(3) Among them, T s2sp is the set value of the secondary network supply water temperature of the heat exchange station; f1 to f3 are calculation coefficients, and T o is the outdoor temperature.

7. The heat exchange station control method based on the indoor temperature separation technology according to claim 6, characterized in that The relationship model between the secondary network circulating flow rate ratio of the heat exchange station and the outdoor temperature, solar radiation intensity, and indoor heat gain intensity is expressed as: u w2 = f(T o , q sols , q intarg ) ---- (4) Among them, u w2 is the total circulation flow ratio of the secondary network; q sols is the southward solar radiation intensity; q intarg is the average value of the indoor heat gain intensity.

8. A heat exchange station control system based on indoor temperature separation technology, characterized in that, Including: A dynamic model creation module, configured to create a dynamic mathematical model of the heating system based on the energy and mass conservation laws of the control volume, the functional relationship between the indoor temperature and the physical parameters of the heating system, the heat gain / loss of the heat transfer process of the control volume, and the dynamic relationship between the net heat stored in each control volume of the heating system and its heat gain and heat loss; A compensation model acquisition module, configured to respectively simulate and obtain the relationship model between the outdoor temperature and the secondary network supply water temperature of the heat exchange station and the relationship model between the secondary network circulating flow rate ratio of the heat exchange station and the outdoor temperature, solar radiation intensity, and indoor heat gain intensity through the dynamic mathematical model of the heating system when the indoor temperature is maintained at a preset temperature value; A primary compensation control module, configured to input the real-time detected outdoor temperature value into the relationship model between the outdoor temperature and the secondary network supply water temperature of the heat exchange station to calculate the set value of the secondary network supply water temperature, and perform primary compensation control on the heat exchange station based on the error between the set value of the secondary network supply water temperature and the measured value of the secondary network supply water temperature; A secondary compensation control module, configured to input the real-time detected outdoor temperature value, the average value of the southward solar radiation intensity and the indoor heat gain intensity into the relationship model between the secondary network circulating flow rate ratio of the heat exchange station and the outdoor temperature, solar radiation intensity, and indoor heat gain intensity to calculate the secondary network circulating flow rate of the heat exchange station, and perform secondary compensation control on the heat exchange station based on the secondary network circulating flow rate of the heat exchange station; Among them, the primary compensation control module is specifically configured to: Input the real-time detected outdoor temperature value into the relationship model between the outdoor temperature and the secondary network supply water temperature of the heat exchange station to calculate the set value of the secondary network supply water temperature, and calculate the error between the set value of the secondary network supply water temperature and the measured value of the secondary network supply water temperature; Input the error between the set value of the secondary network supply water temperature and the measured value of the secondary network supply water temperature into the controller algorithm formula to calculate the flow control parameter of the primary side electric control valve of the heat exchange station, where the secondary network of the heat exchange station adopts a closed-loop control loop; Adjust the opening degree of the electric control valve by using the flow control parameter of the primary side electric control valve of the heat exchange station to adjust the secondary network water supply temperature in real time; The secondary compensation control module is specifically configured to perform variable frequency control or intermittent control on the circulating water pump of the heat exchange station.

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