CN115289520A - Control method and system of heat exchange station based on indoor temperature separation technology - Google Patents

Abstract

The invention discloses a heat exchange station control method and system based on indoor temperature separation technology. The method includes creating an actual dynamic mathematical model of a heating system; and simulating the actual dynamic mathematical model of the heating system to obtain outdoor temperature and heat exchange station two. The relationship model of the water supply temperature of the secondary network 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; input the outdoor temperature value detected in real time into the two relationship models respectively for calculation The set value of the water supply temperature of the secondary network is obtained to carry out closed-loop compensation control of the heat exchange station, and the circulation flow of the secondary network of the heat exchange station is calculated to carry out open-loop compensation control of the heat exchange station. The method realizes hierarchical control of indoor temperature, significantly improves thermal comfort of thermal users and meets indoor temperature control target requirements.

Description

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

technical field

The invention relates to the technical field of indoor temperature control of heat users in a central heating system, and in particular to a heat exchange station control method and system based on indoor temperature separation technology.

Background technique

At present, the most important goal of the central heating system is to ensure the indoor temperature of the heat users. If the user's indoor temperature can be detected in real time and the indoor temperature can be controlled locally (usually by household control or room control), the main goal of the heating system can be achieved. Then the ensuing question is how to match supply and demand and precisely control according to the heat source of the heating system, the structure of the heating network and the characteristics of the heat exchange station, and optimize the operation of the system to ensure reasonable operating parameters of the indoor temperature control point.

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

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

(2) Investment, operation and maintenance of household and room automatic control;

(3) The deviation between the actual detected value of the indoor temperature and the real indoor temperature value;

(4) Uploading of real-time detection values of indoor temperature and interruption of communication;

(5) The average calculation problem of indoor temperature;

(6) The control strategy and control parameter setting of the indoor temperature;

(7) Cost-effectiveness of indoor temperature detection;

(8) The specific installation location of the indoor temperature measuring point.

Based on the above reasons, it is difficult to realize the indoor temperature procurement cost, data detection, truth value correction, communication interruption and control of all heat users in the central heating system. It is necessary to find other alternative ways to approximate the actual heat user's indoor temperature.

In addition, as a main node in the heat transfer process of the overall heating system, the indoor temperature is affected by the operating parameters of the heating system and various disturbances. Although from the perspective of system operation, the indoor temperature is the only result of the central heating system in a certain parameter state (combined effect of system operating parameters and interference), but it is almost impossible to accurately calculate the dynamic indoor temperature value of heat users. possible tasks.

From the point of view of central heating system control accuracy, the indoor temperature of heat users does not require very precise control (high-precision control requires large investment, and the cost performance is unreasonable), usually it can reach a control accuracy of ±0.5-1°C Meet user needs. Therefore, the study of the dynamic characteristics of the indoor temperature of the heating system under different operating and disturbance conditions is not only 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 system operation. .

Contents of the invention

The purpose of the present invention is to provide a heat exchange station control method and system based on indoor temperature separation technology, so as to realize hierarchical control of indoor temperature.

In order to achieve the above purpose, an embodiment of the present invention provides a heat exchange station control method based on indoor temperature separation technology, including:

S1: According to the energy and mass conservation law of the control body, 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 body, and the net heat stored and the heat gain of each control body of the heating system Create the actual dynamic mathematical model of the heating system based on the dynamic relationship between the heat loss and the heat loss, wherein the control body includes the heat exchange station, the secondary network of the heat exchange station and the heat user of the building;

S2: When the indoor temperature is maintained at the preset temperature value, the relationship model between the outdoor temperature and the water supply temperature of the secondary network of the heat exchange station and the ratio of the circulating flow rate of the secondary network of the heat exchange station are obtained by simulating the actual dynamic mathematical model of the heating system. The relationship model among outdoor temperature, solar radiation intensity, and indoor heat gain intensity;

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

S4: Input the real-time detected outdoor temperature value, the southward solar radiation intensity and the average indoor heat gain intensity into the value 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 The relationship model of the heat exchange station calculates the circulation flow of the secondary network of the heat exchange station, and performs open-loop compensation control on the heat exchange station according to the circulation flow of the secondary network of the heat exchange station.

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

According to the energy and mass conservation law of the control body, 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 body, and the net heat stored in each control body of the heating system and their heat gain and loss The dynamic relationship between heat creates an ideal dynamic mathematical model of the heating system;

Adjust the flow rate of the thermal inlet flow control valve of the building, so that the secondary network of the heat exchange station is in a state of hydraulic balance;

Carrying out 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;

Verifying the dynamic response steady-state value of the ideal dynamic mathematical model of the heating system by changing the outdoor temperature and heat source fuel supply to determine the accuracy of the ideal dynamic mathematical model of the heating system under outdoor temperature changes;

Based on the analysis of the actual operating parameters and design parameters of the heating system, the heat transfer area adequacy coefficient of the heat exchanger and the terminal cooling device of the heating system is obtained, and the heat transfer area coefficient of the heat exchanger and the terminal cooling device of the heating system is calculated. The heat transfer area abundance coefficient is input into the ideal dynamic mathematical model of the heating system to obtain the actual dynamic mathematical model of the heating system.

According to another embodiment of the present invention, the indoor temperature is based on the heat capacity of the control body of the heating system, the temperature of the secondary supply and return water, the circulation flow rate of the heat user, the heat dissipation device of the heat user and the comprehensive heat transfer coefficient of the building envelope, The heat transfer area adequacy coefficient of the cooling device, the outdoor temperature, solar radiation and indoor heat gain intensity, the heating area of the heat user, the heat load index of the heat user and the heat loss coefficient are calculated.

According to another embodiment of the present invention, the heat gain/loss heat of the heat transfer process of the control body is expressed as:

Among them, T is the temperature; Q _in is the heat gain of the control body; Q _out is the heat loss of the control body; Const is the integral constant.

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

Among them, u _f is the control variable of the heat source fuel; G _fd is 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 and u _w2 are the primary and secondary heat exchange stations Secondary side flow control variables; T _s1 and T _r1 are primary network supply and return water temperatures; f _x is the heat transfer area abundance coefficient of the heat exchanger; U _x is the comprehensive heat transfer coefficient of the heat exchanger; LMTD is the logarithmic mean of the heat exchanger Error; m is the coefficient related to the heat transfer coefficient test of the radiator; j is the east, west, and south; F _win is the area of the external window; i is the building thermal user number.

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

T _s2sp ＝f ₁ T _o ² +f ₂ T _o +f ₃ ----(3)

Among them, T _s2sp is the water supply temperature setting value of the secondary network of the heat exchange station; f ₁ ~ f ₃ are calculation coefficients, and T _o is the outdoor temperature.

According to another embodiment of the present invention, 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 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 indoor heat gain.

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

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

Input the error between the set value of the water supply temperature of the secondary network and the measured value of the water supply temperature of the secondary network into the controller algorithm formula to calculate the flow control parameters of the electric control valve on the primary side of the heat exchange station, wherein the secondary network of the heat exchange station adopts a closed loop Control loop;

The flow control parameters of the electric regulating valve on the primary side of the heat exchange station are used to adjust the opening of the electric regulating valve, so as to adjust the water supply temperature of the secondary network in real time.

According to another embodiment of the present invention, the open-loop compensation control of the heat exchange station according to the circulating flow rate of the secondary network 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.

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:

The dynamic model creation module is configured to be based on the energy and mass conservation laws of the control body, 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 body, and the storage of each control body of the heating system Create a dynamic mathematical model of the heating system based on the dynamic relationship between the net heat and its gain and loss;

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

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

The secondary compensation control module is configured to input the real-time detected outdoor temperature value, the southward solar radiation intensity and the average value of indoor heat gain intensity to the secondary network circulation flow ratio of the heat exchange station and the outdoor temperature and solar radiation intensity 1. The relationship model between the indoor heat gain intensity is calculated to obtain the circulation flow of the secondary network of the heat exchange station, and the secondary compensation control of the heat exchange station is carried out according to the circulation flow of the secondary network of the heat exchange station.

The inventive method has the following advantages:

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 to obtain the thermal characteristics of the heating system; and then analyzes the thermal characteristics of the heating system. Obtain the secondary network water supply temperature and total circulation flow setting parameters of the heat exchange station control system (quality adjustment) using indoor temperature separation technology to achieve hierarchical control of indoor temperature, achieve significant improvement of thermal comfort for thermal users, and Meet the indoor temperature control target requirements.

Description of drawings

Fig. 1 is the schematic flow chart of the heat exchange station control method based on the indoor temperature separation technology of the present invention;

Figure 2 is a process flow diagram of the heating system;

Fig. 3 is a schematic diagram of curved surface space between indoor temperature, outdoor temperature and secondary network supply and return water temperature;

Fig. 4 is the first-level and second-level interference test data in the simulation;

Figure 5 is a schematic diagram of the dynamic response of the heating system when the primary disturbance is constant;

Figure 6 is a schematic diagram of the dynamic response of the heating system when the primary disturbance changes;

Figure 7 is a schematic diagram of the dynamic response of the heating system when the primary and secondary disturbances change simultaneously;

Fig. 8 is a relational graph of the outdoor temperature and the water supply temperature of the secondary network;

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

Fig. 10 is a schematic diagram of the dynamic response of the heating system during the temperature compensation control of the secondary network water supply;

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

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

Fig. 13 is a structural block diagram of the heat exchange station control system based on the indoor temperature separation technology of the present invention.

Detailed ways

The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention. In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the following will clearly and completely describe the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention. Apparently, the described embodiments are some, not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Referring to Figure 1, an embodiment of the present invention provides a heat exchange station control method based on indoor temperature separation technology, including:

S1: According to the energy and mass conservation law of the control body, 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 body, and the net heat stored and the heat gain of each control body of the heating system Create an actual dynamic mathematical model of the heating system based on the dynamic relationship between heat loss and heat loss, where the control body includes heat exchange stations, secondary networks of heat exchange stations, and building heat users;

S2: When the indoor temperature is maintained at the preset temperature value, the relationship model between the outdoor temperature and the water supply temperature of the secondary network of the heat exchange station and the circulation flow ratio of the secondary network of the heat exchange station and the outdoor temperature are obtained by simulating the actual dynamic mathematical model of the heating system. , the relationship model between solar radiation intensity and indoor heat gain intensity;

S3: Input the real-time detected outdoor temperature value into the relationship model between the outdoor temperature and the water supply temperature of the secondary network of the heat exchange station to calculate the set value of the water supply temperature of the secondary network. The error of the measured value of the water supply temperature performs closed-loop compensation control on the heat exchange station;

S4: Input the real-time detected outdoor temperature value, the southward solar radiation intensity and the average indoor heat gain intensity into the relationship 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 The model calculates the circulation flow of the secondary network of the heat exchange station, and performs open-loop compensation control on the heat exchange station according to the circulation flow of the secondary network of the heat exchange station.

The main sources of interference in current heating systems are: outdoor temperature, solar radiation and indoor heat gain. Typically, outdoor temperature plays a major role, with solar radiation and indoor heat gain playing a secondary 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 the solar radiation and indoor heat gain. At present, most central heating systems in northern China have a heating area of more than 1 million m ² , and the system structure adopts an indirect connection method, that is, the system is composed of heat sources, primary networks, heat exchange stations, secondary networks, and heat users. The basic unit directly related to the indoor temperature of heat users can be defined as composed of heat exchange station, secondary network and heat users. Therefore, the research on the indoor temperature of heat users is suitable to take the heat exchange station and its downstream as the basic unit (so the control body in this embodiment mainly involves the heat exchange station, the secondary network of the heat exchange station, and the building heat user), and the heat exchange station As the key node of automatic control, the station not only simplifies very complicated problems, but also improves the practicability and practical application value of the research results.

In the actual operation control process of the central heating system, as the outdoor temperature changes (first-order interference), in order to meet the heat supply and demand matching between the heat exchange station and the heat user, the heat exchange station keeps the secondary network circulation flow constant In the case of constant flow (constant flow), change the water temperature (secondary water supply temperature or secondary average temperature) in order to ensure the indoor temperature of the thermal user. However, usually the heat matching control of the heat exchange station does not consider the dynamic influence of the secondary disturbance on the indoor temperature. Therefore, its actual operation control results in large fluctuations in indoor temperature, which not only affects the thermal comfort of thermal users, but also causes overheating of indoor temperature, waste of heat supply and system investment, and reduces the economic benefits of the heating system.

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 control of the heat exchange station are separated according to the level of interference intensity, which not only grasps the main contradiction, but also does not ignore the secondary Contradictions, in order to improve and improve the quality of heat supply, while reducing the level of energy consumption of the system.

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

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 to obtain the thermal characteristics of the heating system; and then analyzes the thermal characteristics of the heating system. Obtain the secondary network water supply temperature and total circulation flow setting parameters of the heat exchange station control system (quality adjustment) using indoor temperature separation technology to achieve hierarchical control of indoor temperature, achieve significant improvement of thermal comfort for thermal users, and Meet the indoor temperature control target requirements.

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

S101: According to the energy and mass conservation law of the control body, 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 body, and the net heat stored and the heat gain of each control body of the heating system Create an ideal dynamic mathematical model of the heating system based on the dynamic relationship between heat loss and heat loss;

S102: Adjust the flow rate of the thermal inlet flow control valve of the building, so that the secondary network of the heat exchange station is in a state of hydraulic balance;

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;

S104: Check the dynamic response steady-state value of the ideal dynamic mathematical model of the heating system by changing the outdoor temperature and the fuel supply of the heat source, so as to determine the accuracy of the ideal dynamic mathematical model of the heating system under the change of outdoor temperature;

S105: Based on the analysis of the actual operating parameters and design parameters of the heating system, the adequacy coefficient of the heat transfer area of the heat exchanger and the end cooling device of the heating system is obtained, and the heat transfer area of the heat exchanger and the end cooling device of the heating system is calculated. The area abundance coefficient is input into the ideal dynamic mathematical model of the heating system to obtain the actual dynamic mathematical model of the heating system.

In some embodiments, in the heat exchange station control method based on the indoor temperature separation technology of the present invention, the indoor temperature (T _z ) is based on the heat capacity of the control body (C) of the heating system, the temperature of the secondary supply and return water (T _s2 , T _r2 ), thermal user circulation flow rate (G ₂ ), comprehensive heat transfer coefficient of thermal user cooling device and building envelope (U _ht , U _en ), heat transfer area abundance coefficient of cooling device (f _ht ), outdoor temperature (T _o ), solar radiation and indoor heat gain intensity (q _sol , q _int ), heat user heating area (F), heat user heat load index (q _F ) and heat loss coefficient (f _h ). See the following formulas (1) and (2) for the relationship between the parameters.

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

Among them, T is the temperature, ℃; _Qin is the heat gain of the control body, W; Q _out is the heat loss of the control body, W; Const is the integral constant.

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

Among them, u _f is the control variable of the heat source fuel; G _fd is the rated flow rate of the heat source fuel, Kg/s; HV is the fuel calorific value, J/kg; ηb is the thermal efficiency of the heat source boiler; c _w is the specific heat of water, J/(Kg ℃); u _w1 and u _w2 are the primary and secondary side flow control variables of the heat exchange station; T _s1 and T _r1 are the supply and return water temperature of the primary network, °C; f _x is the heat transfer area abundance coefficient of the heat exchanger; U _x is the comprehensive heat transfer coefficient of the heat exchanger, W/℃; _LMTD is the logarithmic average 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; Window area, m ² ; i is the number of thermal users of the building.

Specifically, the conventional indirect connection central heating system produces the required heat from the heat source, and first transmits the heat 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 heat exchange station through the heat exchanger. The low-temperature water on the secondary side of the device makes it warm up; thirdly, the thermal user cooling device receives the hot water heated by the secondary network, and dissipates heat to the indoor air through the terminal cooling device, so that the indoor temperature reaches the control temperature; finally, the indoor environment is compared with the outdoor environment Heat exchange, by changing the heat supplied by the secondary network into the heat user, maintains the stability and control target of the indoor temperature under the condition that the outdoor environment is constantly changing. After the hot water in the heating network releases heat, it passes through the secondary network and the return water of the primary network respectively through the lowered temperature and enters the heat exchanger and the heat source boiler of the heat exchange station respectively, and is heated again, and the heat conversion sequence is repeated in sequence.

In view of the implementation difficulty of monitoring the indoor temperature of each thermal user, for the convenience of dynamic model creation, actual field application and dynamic model analysis, the indoor temperature of thermal users in each building is virtualized as an indoor temperature by using the lumped parameter method, so that each Thermal users (buildings) can then be represented by an indoor temperature.

Based on the laws of mass conservation and energy conservation, a complete dynamic mathematical model of the heating system is created. First, the physical model of the central heating system is established. The process flow chart is shown in Figure 2. In order 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 the mathematical model are simplified. The basic formula of the dynamic mathematical model is shown in the above formula (1). Equation (1) clarifies the dynamic relationship between the net heat stored in each control body of the heating system and its gain and loss.

For central heating systems with indirect connections, according to the heat transfer process and heat storage capacity, the heating system is usually divided into the following control bodies: heat source boilers, heat exchangers, end heat sinks for heat users, and indoor air. The heat gain (Q _in ) of the control body is the heat released by fuel combustion, the heat released by the primary side of the heat exchanger, the heat obtained by the terminal cooling device from hot water, solar radiation and indoor heat gain, which vary according to the specific control body. The heat loss of the control body (Q _out ) is the heat carried by the heat source boiler converted 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 to the indoor air by the end cooling device of the heat user, and the heat carried by the indoor air. The amount of heat dissipated by the air to the outdoor environment, again, is calculated in relation to the selected control volume.

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

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

a) The law of conservation of energy and mass of the control body;

b) the dynamic heat transfer process of formula (1);

c) Influencing factors of the thermal user's own indoor temperature;

d) Heat gain and heat loss of the control body in formula (2).

Based on the above, the ideal dynamic mathematical model of the overall heating system is composed of 9 dynamic equations, which respectively describe the dynamic change process of T _s1 , T _r1 , T _s2 , T _r2i , T _zi and the net heat stored in the corresponding control body , The relationship between heat release and heat loss. In the ideal dynamic mathematical model, the circulation flow of the primary and secondary networks is the design flow, 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 abundance coefficient of the heat exchange area, that is, f _x = 1 and f _ht = 1 . At the same time, the influence of solar radiation and indoor heat gain interference on system operating parameters is not considered.

The actual dynamic mathematical model is derived from the ideal mathematical model, and the actual dynamic model includes the heat transfer area abundance coefficient of the heat exchanger (f _x ≠1), the heat transfer area abundance coefficient of the heat sink at the end of the heat user (f _ht ≠1), the primary network Circular flow control variable (u _w1 ), and secondary network flow control variable (u _w2i ). When simulating the indoor temperature of heat users, it is necessary to ensure that the secondary network between the heat exchange station and the heat users is in a state of hydraulic balance. Therefore, the flow adjustment valve for the thermal inlet flow of the building is adjusted to meet the requirements of the secondary network during indoor temperature simulation. Preconditions for hydraulic balance of the net;

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 known that when the outdoor temperature is designed and the system design circulation flow rate, the adjustment of the heat source fuel The supply volume, the indoor temperature of heat users (buildings 1~3#) and the supply and return water temperature of the heating system can all reach the design parameters, indicating that the dynamic model of the heating system is correct under the design conditions;

For the ideal dynamic mathematical model, change the outdoor temperature and heat source fuel supply, and check the dynamic response steady-state value of the dynamic mathematical model. The indoor temperature of the user and the temperature of the supply and return water of the heating system are all reasonable values, which shows that the ideal dynamic model will change when the outdoor temperature changes. It is also accurate in the case of

Based on the actual operating parameters and design parameters of the heating system, through data analysis and calculation, the heat transfer area adequacy coefficient of the actual system heat exchanger and terminal cooling device is obtained. Substitute this abundance coefficient into the ideal dynamic model to get the dynamic mathematical model of the actual heating system. Using the dynamic mathematical model of the actual system, input different parameters (heat source fuel control variables, actual circulation flow of the primary and secondary network and outdoor temperature), observe the output parameters of the actual dynamic model, and compare and compare with the operating parameters of the actual heating system In contrast, it shows that the error between the steady-state value output by the dynamic model and the measured operating 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.

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 dynamic simulation and mapping of the actual heating system.

3. Operation characteristics of heat exchange station based on first-level disturbance

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

Table 1 Supply and return water temperature of secondary network of heat exchange station at different indoor and outdoor temperatures

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

Among them, the surface space among indoor temperature, outdoor temperature and secondary network supply and return water temperature is shown in Figure 3.

The disturbance states used for simulation are:

(1) Simulation time range: 2 consecutive days

(2) First-order and second-order disturbances within the simulated time range

Level 1 interference: the maximum and minimum values are -4°C and -15°C respectively;

Secondary interference (solar radiation): the maximum and minimum values are 157W/m ² and 0W/m ² respectively;

Secondary interference (indoor heat gain): the maximum and minimum values are 6.5W/m ² and 3.7W/m ² respectively;

The outdoor temperature and additional heat gain (solar radiation and indoor heat gain) intensity for two consecutive days are shown in Figure 4. Note that this example only shows the monitoring data of southward solar radiation, and the value displayed by the indoor heat gain curve in Figure 4(b) is 10 times the actual value (for the convenience of data display).

3.1 Dynamic response of operating parameters of heating system parameters when the first-level disturbance is constant

(1) Simulation conditions

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

(2) Simulation results

Using the actual dynamic mathematical model simulation, the indoor temperatures of the three users (buildings 1 to 3#) are 19.8°C, 19.9°C and 19.8°C respectively, and the total supply and return water temperatures at the secondary network outlet of the heat exchange station are 52.2°C and 33.5°C respectively. ℃. The return water temperatures of the three users (buildings) of 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 secondary network of the buildings is 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.

3.2 The dynamic response of the operating parameters of the heating system parameters when the first-level disturbance changes

(1) Simulation conditions

The outdoor temperature changes, the secondary network achieves hydraulic balance and operates at constant flow, and the heat source fuel ratio is 0.65.

(2) Simulation results

When the fuel ratio of the heat source is fixed (0.65), regardless of the influence of the initial value of the dynamic mathematical model (the first 10 hours), the dynamic response of the system is shown in Figure 6 under different outdoor temperatures. As shown in the figure, the dynamic response range of indoor temperature is 16.8-24.1°C, and the variation range of 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, the water temperature (supply water temperature or secondary average temperature) of the heat exchange station must be controlled.

3.3 Dynamic response of heating system operating parameters when primary and secondary disturbances change simultaneously

(1) Simulation conditions

The primary and secondary disturbance changes, the secondary network achieves hydraulic balance and operates at constant flow, and the heat source fuel ratio is 0.5.

(2) Simulation results

When the fuel ratio of the heat source is constant (0.5), regardless of the influence of the initial value of the dynamic mathematical model (the first 10 hours), the dynamic response of the system at different outdoor temperatures is shown in Figure 7. As shown in Figure 7, the dynamic response range of indoor temperature is 13.5-30.7°C, and the variation range of building return water temperature is 23.7-43.4°C. The dynamic response results show that the deviation between the indoor temperature and the return water temperature of the building is further enlarged, and appropriate control is required at the heat exchange station to compensate for the impact of disturbance on system operation.

To sum up, the interference existing in the heating system has a great influence on the operating parameters of the system, and the impact of the first-level interference on the system operation is greater than that of the second-level interference; after the first-level and second-level interference are superimposed, the The fluctuation of the indoor temperature and the return water temperature of the building requires additional measures to control the indoor temperature; the analysis of the dynamic simulation results of the influence of interference on the indoor temperature shows that only one control strategy for the heat exchange station is used to improve the indoor temperature change. Amplitude and control accuracy are difficult to obtain good results; indoor temperature separation technology is proposed to decompose the comprehensive superposition effect of interference on indoor temperature, and satisfactory control accuracy is expected to be obtained.

In some embodiments, the relationship model between the outdoor temperature and the water supply temperature of the secondary network 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:

T _s2sp ＝f ₁ T _o ² +f ₂ T _o +f ₃ ----(3)

Among them, T _s2sp is the water supply temperature setting value of the secondary network of the heat exchange station; f ₁ ~ f ₃ are calculation coefficients, and To is the outdoor temperature.

In some embodiments, in the heat exchange station control method based on the indoor temperature separation technology of the present invention, 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 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 _s o _ls is the southward solar radiation intensity, W/m ² ; q _intarg is the average indoor heat gain intensity, W/m ² .

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

First, the water supply temperature of the secondary network is used to compensate the primary disturbance:

When the indoor temperature is maintained at 20°C, the relationship curve between the outdoor temperature and the water supply temperature of the secondary network can be obtained through the actual dynamic mathematical model simulation, as shown in Figure 8. Figure 8 can be used as the outdoor temperature (first-order interference) compensation setting parameter for the secondary network water supply temperature of the heat exchange station control system, and can also be calculated by the above formula (3). In this example, f ₁ , f ₂ and f ₃ are respectively are -0.0019, -0.9524 and 43.2064.

Secondly, the secondary network circulation flow is used to compensate the secondary interference:

By using the actual dynamic mathematical model simulation of the heating system, when the indoor temperature is maintained at 20°C, the relationship between the secondary network circulation flow ratio (actual circulation flow/design circulation flow) and the outdoor temperature, solar radiation intensity, and indoor heat gain intensity The relationship is shown in the above formula (4). In order to calculate the system control parameter setting, the data of solar radiation intensity (east, west and south) and indoor heat gain intensity of buildings are simplified as southward solar radiation intensity and indoor heat gain Strength average. The indoor heat gain intensity is determined and simulated according to the specific heat user properties (not the detection value). It should be noted that the outdoor temperature is included in the formula (4). The reason is that when the secondary disturbance is used for direct control, the fluctuation of the circulation flow of the secondary network is relatively large (due to the large fluctuation of solar radiation), in order to improve the circulation For the stability of flow control, adding outdoor temperature for comprehensive compensation calculation can effectively reduce the fluctuation range of circulating flow.

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

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

S302: Input the error between the set value of the water supply temperature of the secondary network and the measured value of the water supply temperature of the secondary network into the controller algorithm formula to calculate the flow control parameters of the electric control valve on the primary side of the heat exchange station, wherein the secondary network of the heat exchange station adopts a closed loop Control loop;

S303: Use the flow control parameters of the electric control valve on the primary side of the heat exchange station to adjust the opening of the electric control valve, so as to adjust the water supply temperature of the secondary network in real time.

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

The control principle diagram of the (quasi) optimal control strategy for mass regulation of heat exchange stations based on indoor temperature separation technology is shown in Figure 9. As shown in Figure 9, for the first-level disturbance compensation control, the water supply temperature of the secondary network of the heat exchange station adopts a closed-loop control loop (controller _C1 ), and calculates the set value of the water supply temperature of the secondary network (T _s2sp ) and compare it with the measured value of the water supply temperature of the secondary network (T _s2 ) to obtain the error, and use a typical controller control algorithm (see the following formula (5)) to obtain the flow control parameters of the primary side electric control valve of the heat exchange station (u _w1 ), adjust the opening of the electric control valve to adjust the water supply temperature of the secondary network in real time. For the secondary disturbance compensation control, the circulating flow of the secondary network of the heat exchange station is obtained through the comprehensive calculation of disturbance parameters, and the open-loop control strategy is adopted to implement frequency conversion control of the circulating water pump of the heat exchange station (appropriate intermittent control can also be used). Therefore, the quality adjustment of the heat exchange station can be realized through the closed-loop first-level interference compensation and the open-loop second-level interference compensation.

Among them, k _p , _ki are proportional and integral constants in typical controllers; t is the running time, the unit is s.

At present, the control strategy usually used in the heat exchange station is based on the control of the water supply temperature of the secondary network, and the secondary network adopts constant flow operation. In this embodiment, the operation control strategy of the mass-regulated heat exchange station based on the indoor temperature separation technology is applied, in order to compare the dynamic response difference and energy saving situation of the two control strategies during operation.

Secondary network water supply temperature control:

When this control strategy is adopted, the dynamic variation range and average value of the indoor temperature are 21-30.1°C and 20.3°C respectively; the average value of heat source fuel supply is 0.587; the variation range of the return water temperature of the secondary network of the building 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 heating system adopts the secondary network water supply temperature compensation control is shown in Figure 10.

Control based on indoor temperature separation technology:

When this control strategy is adopted, the dynamic variation range and average value of the indoor temperature are 17.3-22.8°C and 20.1°C respectively, and the range of 20±1°C for the three buildings (heat users) to meet their indoor temperature design value is 90% Above, the thermal comfort of thermal users can be significantly improved in most of the time; the average heat source fuel supply is 0.528; the return water temperature of the secondary network of the building varies from 15.4 to 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 using indoor temperature separation control technology is shown in Figure 11. The total circulation flow ratio (u _w2 ) of the secondary network of this control strategy is shown in Figure 12.

Calculation of energy saving rate:

According to the dynamic simulation of the above two control strategies, the heat consumption of the heat exchange station, the circulation flow rate of the secondary network and the power consumption ratio can be obtained. Power consumption calculations are determined using the cubic relationship between flow and power. The calculation of energy saving rate is shown in Table 2.

Table 2 Calculation of energy saving rate of two control strategies

It can be seen from Table 2 that compared with the conventional method of only using secondary network water supply temperature control, the heat saving rate and electricity saving rate of using the control strategy based on indoor temperature separation technology are 10.1% and 80%, respectively.

In summary, it can be seen that: (1) Simply adopting the secondary network water supply temperature control of the heat exchange station cannot meet the thermal comfort requirements of the thermal users, because the secondary interference has not been effectively compensated, resulting in excessive indoor temperature fluctuations; (2) ) The heat exchange station control strategy using indoor temperature separation technology can significantly improve the heat supply quality of heat users, and meet user needs in most of the time, and the average indoor temperature also meets the control target requirements; (3) using indoor temperature The control strategy of the separation technology can reduce the heat consumption of the heat exchange station by 10% and the circulation flow of the heat exchange station by 41.5% respectively (corresponding to saving more than 70% of electricity) when satisfying the user's heat supply quality.

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 and simulation technology of the heating system, the thermal characteristics of the heating system can be obtained; through the analysis of the thermal characteristics of the heating system, the indoor The heat exchange station control system (quality adjustment) with temperature separation technology sets parameters for the secondary network water supply temperature and total circulation flow; the heat exchange station control system with indoor temperature separation technology can significantly improve the thermal comfort of heat users and meet Indoor temperature control target requirements; dynamic simulation results show that the heat exchange station control system using indoor temperature separation technology can obtain 10% energy saving and more than 70% power saving while ensuring the quality of heat supply; using indoor temperature separation technology The heat exchange station control system, under the current heating cost framework, is estimated to save 2-3 yuan/m ² of heating operation costs, and can obtain significant social, economic, environmental and management benefits; based on indoor temperature separation technology The control system of the heat exchange station is easy to obtain the set value of the control parameters, combined with the automatic operation of the heat exchange station, it is beneficial to the implementation and promotion, and promotes the early realization of the "double carbon" and "double reduction" goals.

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

The dynamic model creation module 10 is configured to be based on the energy and mass conservation laws of the control body, 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 body, and the control body of the heating system The dynamic relationship between the net heat stored and its heat gain and loss creates a dynamic mathematical model of the heating system;

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

The first-level compensation control module 30 is configured to input the real-time detected outdoor temperature value into the relationship model between the outdoor temperature and the water supply temperature of the secondary network of the heat exchange station to calculate the set value of the water supply temperature of the secondary network, and calculate the set value of the water supply temperature of the secondary network according to the water supply temperature of the secondary network. The error between the temperature setting value and the measured value of the water supply temperature of the secondary network performs primary compensation control on the heat exchange station;

The secondary compensation control module 40 is configured to input the real-time detected outdoor temperature value, southward solar radiation intensity and indoor heat gain average value to the heat exchange station secondary network circulation flow ratio and outdoor temperature, solar radiation intensity, The relationship model between the indoor heat gain intensity is calculated to obtain the circulation flow of the secondary network of the heat exchange station, and the secondary compensation control of the heat exchange station is carried out according to the circulation flow of the secondary network of the heat exchange station.

Although the present invention has been described in detail with general descriptions and specific examples above, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present invention. Therefore, the modifications or improvements made on the basis of not departing from the spirit of the present invention all belong to the protection scope of the present invention.

Claims (10)

1. A heat exchange station control method based on an indoor temperature separation technology is characterized by comprising the following steps:

s1: establishing an actual dynamic mathematical model of the heating system according to the energy and mass conservation law of the control bodies, the functional relation between the indoor temperature and the physical parameters of the heating system, the heat gain/heat loss of the control bodies in the heat transfer process, and the dynamic relation between the net heat stored by each control body of the heating system and the heat gain and heat loss of the control bodies, wherein the control bodies comprise heat exchange stations, secondary networks of the heat exchange stations and building heat users;

s2: respectively simulating by using the actual dynamic mathematical model of the heat supply system when the indoor temperature is maintained at a preset temperature value to obtain a relation model of the outdoor temperature and the temperature of the secondary network of the heat exchange station and a relation model of the circulation flow ratio of the secondary network of the heat exchange station and the outdoor temperature, the solar radiation intensity and the indoor heat intensity;

s3: inputting the outdoor temperature value detected in real time into a relation model of the outdoor temperature and the water supply temperature of a secondary network of the heat exchange station to calculate to obtain a set value of the water supply temperature of the secondary network, and performing closed-loop compensation control on the heat exchange station according to the error between the set value of the water supply temperature of the secondary network and the measured value of the water supply temperature of the secondary network;

s4: and calculating a relation model between the outdoor temperature value, the south solar radiation intensity and the indoor heat intensity average value input value which are detected in real time and the heat exchange station secondary network circulation flow ratio and the outdoor temperature, the solar radiation intensity and the indoor heat intensity to obtain the heat exchange station secondary network circulation flow, and performing open-loop compensation control on the heat exchange station according to the heat exchange station secondary network circulation flow.

2. The indoor temperature separation technology-based heat exchange station control method according to claim 1, wherein the S1 includes:

establishing an ideal dynamic mathematical model of the heating system according to the energy and mass conservation law of the control bodies, the functional relation between the indoor temperature and the physical parameters of the heating system, the heat gain/heat loss in the heat transfer process of the control bodies and the dynamic relation between the net heat stored by each control body of the heating system and the heat gain and heat loss of the control bodies;

flow regulation is carried out on a building heat inlet flow regulating valve, so that the secondary network of the heat exchange station is in a hydraulic balance state;

performing 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 working condition;

checking a dynamic response steady state value of the ideal dynamic mathematical model of the heating system by changing the outdoor temperature and the supply quantity of the heat source fuel so as to determine the accuracy of the ideal dynamic mathematical model of the heating system under the condition of outdoor temperature change;

and analyzing the heat transfer area abundance coefficients of the heat exchanger and the tail end heat dissipation device of the heat supply system based on the actual operation parameters and the design parameters of the heat supply system, and inputting the heat transfer area abundance coefficients of the heat exchanger and the tail end heat dissipation device of the heat supply system to the ideal dynamic mathematical model of the heat supply system to obtain the actual dynamic mathematical model of the heat supply system.

3. The heat exchange station control method based on the indoor temperature separation technology as claimed in claim 2, wherein the indoor temperature is calculated according to the heat capacity of the control body of the heating system, the temperature of secondary supply and return water, the heat user circulation flow, the comprehensive heat transfer coefficient of the heat user heat dissipation device and the building envelope, the heat transfer area abundance coefficient of the heat dissipation device, the outdoor temperature, the solar radiation and indoor heat gain intensity, the heat user heating area, the heat user heat load index and the heat loss coefficient.

4. The indoor temperature separation technology-based heat exchange station control method according to claim 3, wherein the heat gain/heat loss amount of the control body heat transfer process is expressed as:

wherein T is temperature; q _in To control the heat gain of the body; q _out To control body heat loss; const is an integration constant.

5. The indoor temperature separation technology-based heat exchange station control method according to claim 4, wherein the dynamic relationship between the net heat stored by each control body of the heating system and the heat gain and the heat loss thereof is represented as follows:

wherein u is _f Controlling a variable for a heat source fuel; g _fd Rated flow rate of fuel for heat source; HV is the fuel calorific value; eta _b The heat efficiency of the heat source boiler is obtained; c. C _w Is the specific heat of water; u. of _w1 、u _w2 Flow control variables of a primary side and a secondary side of the heat exchange station are controlled; t is _s1 、T _r1 Supplying return water temperature for the primary net; f. of _x The heat transfer area margin coefficient of the heat exchanger; u shape _x The heat transfer coefficient is integrated for the heat exchanger; LMTD is heat exchanger logarithmic mean error; m is a coefficient related to a heat transfer coefficient test of the radiator; j is east, west, south; f _win Is the area of the outer window; i is the building hot user number.

6. The heat exchange station control method based on the indoor temperature separation technology as claimed in claim 5, wherein the relational model between the outdoor temperature and the temperature of the supply water of the secondary network of the heat exchange station is expressed as:

T _s2sp ＝f ₁ T _o ² +f ₂ T _o +f ₃ ----(3)

wherein, T _s2sp Supplying a water temperature set value for a secondary network of the heat exchange station; f. of ₁ ～f ₃ To calculate the coefficients, T _o Is the outdoor temperature.

7. The heat exchange station control method based on the indoor temperature separation technology as claimed in claim 6, wherein the relationship model between the heat exchange station secondary network circulation flow ratio and outdoor temperature, solar radiation intensity and indoor heat gain intensity is expressed as:

u _w2 ＝f(t _o 、q _sols 、q _intarg )----(4)

wherein u is _w2 The total circulation flow ratio of the secondary network is; q. q.s _sols Is the intensity of the southbound solar radiation; q. q.s _intarg The average value of the indoor heat intensity is shown.

8. The indoor temperature separation technology-based heat exchange station control method according to claim 7, wherein the S3 includes:

inputting the outdoor temperature value detected in real time into a relation model between the outdoor temperature and the secondary network water supply temperature of the heat exchange station to calculate to obtain a set secondary network water supply temperature value, and calculating an error between the set secondary network water supply temperature value and a measured secondary network water supply temperature value;

inputting 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 a controller algorithm formula to calculate to obtain a flow control parameter of the primary side electric regulating valve of the heat exchange station, wherein the secondary network of the heat exchange station adopts a closed loop control circuit;

and adjusting the opening of the electric regulating valve by utilizing the flow control parameter of the primary side electric regulating valve of the heat exchange station so as to adjust the temperature of the water supply of the secondary network in real time.

9. The method for controlling the heat exchange station based on the indoor temperature separation technology as claimed in claim 8, wherein the step S4 of performing the open-loop compensation control on the heat exchange station according to the secondary network circulation flow of the heat exchange station specifically comprises: and carrying out frequency conversion control or intermittent control on the circulating water pump of the heat exchange station.

10. A heat exchange station control system based on indoor temperature separation technology is characterized by comprising:

the dynamic model creating module is configured to create a dynamic mathematical model of the heating system according to the energy and mass conservation law of the control bodies, the functional relation between the indoor temperature and the physical parameters of the heating system, the heat gain/heat loss of the control bodies in the heat transfer process and the dynamic relation between the net heat stored by each control body of the heating system and the heat gain and heat loss of the control bodies;

the compensation model acquisition module is configured to respectively simulate a relation model of outdoor temperature and the temperature of the water supply of the secondary network of the heat exchange station and a relation model of the circulation flow ratio of the secondary network of the heat exchange station, the outdoor temperature, the solar radiation intensity and the indoor heat intensity by the dynamic mathematical model of the heat supply system when the indoor temperature is maintained at a preset temperature value;

the primary compensation control module is configured to input an outdoor temperature value detected in real time into a relation model between the outdoor temperature and the temperature of the secondary network water supply of the heat exchange station to calculate to obtain a set value of the temperature of the secondary network water supply, and perform primary compensation control on the heat exchange station according to an error between the set value of the secondary network water supply and an actual measured value of the temperature of the secondary network water supply;

and the secondary compensation control module is configured to calculate a relationship model between the outdoor temperature value, the south solar radiation intensity and the indoor heat intensity average value input value which are detected in real time and the secondary network circulation flow ratio of the heat exchange station and the outdoor temperature, the solar radiation intensity and the indoor heat intensity to obtain 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.

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