Supply and demand balance scheduling method for long-distance heat supply system based on flow regulation of heat storage tank

Abstract

The invention discloses a long-distance heat supply system supply and demand balance scheduling method based on heat storage tank flow regulation. The method comprises the steps that a primary network supply and demand imbalance operation condition identification model in an urban area is established; a heat storage tank is additionally arranged on an urban external long-distance heat transfer network between a heat source and a pressure separation station of an original long-distance heat supply system, and a long-distance heat supply system with the urban external long-distance heat transfer network and an urban internal primary network cooperating with the heat storage tank is formed. Setting a heat storage and release flow regulation characteristic of the heat storage tank of the long heat transfer network outside the urban area; establishing a hydraulic working condition calculation model of the long-distance heat supply system in which the long-distance heat supply network outside the urban area and the primary network in the urban area are coordinated, wherein the long-distance heat supply network comprises the heat storage tank; the flow of the heat source supplied to the long-distance heat transfer network, the heat storage tank and the pressure separation station in each time period is distributed; and a water pump and a valve which are correspondingly communicated with the long-distance heat transfer network are regulated and controlled, and the total flow of the pressure isolation station is distributed to each heating station according to the regulation and control target temperature of each heating station.

Description

Technical Field

[0001] The present invention belongs to the technical field of long-distance heat supply system scheduling, and in particular relates to a supply-demand balancing scheduling method for a long-distance heat supply system based on heat storage tank flow regulation. Background Art

[0002] Long-distance heat supply network refers to a heat supply system with a heat supply distance of more than 20 kilometers and a pressure isolation station. Its heating area is usually more than 15 million square meters. With the promotion and popularization of waste heat utilization technology, more and more cities will be involved in long-distance heat supply network issues. The ultimate task of the long-distance heat supply network is to achieve on-demand heating for terminal heat users in the urban area, ensure the quality of heating, and achieve a balance between supply and demand.

[0003] However, in the operation of the current long-distance heating system, an imbalance between supply and demand often occurs. For example, during the peak period of heat load demand, the heat supply of the long-distance heating network is insufficient, resulting in substandard heating, or during the trough period of heat load demand, the heat supply of the long-distance heating network is excessive, which results in energy waste. Currently, heat storage tanks are usually used to alleviate load fluctuations and improve the balance between supply and demand. However, there are few studies on the location of heat storage tanks, flow distribution, and the impact of hydraulic conditions. How to flexibly adjust the flow of the long-distance heating network to the primary network in the urban area through heat storage tanks and achieve the balance of supply and demand of the primary network in the urban area through flow distribution is an urgent problem that needs to be solved.

[0004] Based on the above technical problems, it is necessary to design a new supply and demand balancing scheduling method for long-distance heating systems based on heat storage tank flow regulation. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a supply and demand balancing scheduling method for a long-distance heat supply system based on flow regulation of a heat storage tank. A heat storage tank is added to the long-distance heat transmission network outside the urban area, and the heat storage and release flow regulation characteristics of the heat storage tank are set. The supply and demand imbalance problem of the primary network in the urban area is converted into a flow regulation problem of the long-distance heat transmission network outside the urban area. Through flow distribution, the heat storage tank is used to flexibly adjust the flow of the long-distance heat transmission network to the primary network in the urban area, and the supply and demand imbalance operating condition is adjusted to the supply and demand balanced operating condition.

[0006] In order to solve the above technical problems, the technical solution of the present invention is:

[0007] The present invention provides a method for balancing supply and demand of a long-distance heat supply system based on heat storage tank flow regulation, which comprises:

[0008] S1. Obtain the operation data of the primary network pressure isolation station and each heating station in the urban area, and establish an identification model for the imbalanced operation condition of the primary network supply and demand in the urban area to identify the imbalanced operation condition of the primary network supply and demand in the urban area;

[0009] S2. Add a heat storage tank to the long-distance heat transmission network outside the urban area between the heat source and the pressure isolation station of the original long-distance heat transmission system. At the same time, after the heat storage tank is connected with the long-distance heat transmission network outside the urban area and the pressure isolation station, the flow of the long-distance heat transmission network to the primary network in the urban area can be flexibly adjusted through the heat storage tank, and the imbalanced supply and demand operation condition of the primary network in the urban area can be adjusted to the balanced supply and demand operation condition, forming a long-distance heat transmission system that coordinates the long-distance heat transmission network outside the urban area with the heat storage tank and the primary network in the urban area;

[0010] S3. Setting the heat storage and release flow regulation characteristics of the heat storage tank of the long heat transmission network outside the urban area, including: when the heat storage tank is storing heat, part of the flow of the long heat transmission network outside the urban area is stored in the heat storage tank, and when the heat storage tank is releasing heat, the flow of the heat storage tank is released to the long heat transmission network outside the urban area, and the heat storage and release of the heat storage tank is used to meet the supply and demand balance of the primary network in the urban area. At the same time, the total flow demand of the pressure isolation station changes with the heat load demand of each thermal power station and is not affected by the heat storage and release of the heat storage tank;

[0011] S4. Establish a hydraulic condition calculation model for the long-distance heat supply system that coordinates the long-distance heat supply network outside the urban area with heat storage tanks and the primary network within the urban area;

[0012] S5. Based on the hydraulic condition calculation model of the long-distance heat supply system and the heat storage and release flow regulation characteristics of the heat storage tank of the long-distance heat supply network outside the urban area, combined with the heat load demand changes of the pressure isolation station, the identification information of the supply and demand imbalance operation condition of the primary network in the urban area, and the analysis of flow distribution, the impact of the heat storage tank on the hydraulic condition of the long-distance heat supply network when storing and releasing heat, the flow of heat source supply to the long-distance heat supply network, heat storage tank and pressure isolation station in each period is distributed;

[0013] S6. Based on the flow distribution results of the heat source supplying the long-distance heat transmission network, heat storage tanks and pressure isolation stations in each period, the corresponding water pumps and valves connected to the long-distance heat transmission network are regulated, and according to the control target temperature of each thermal power station, the total flow of the pressure isolation station is allocated to each thermal power station as needed.

[0014] Further, the S1 specifically includes:

[0015] Obtain the operating data of the primary network pressure isolation station and each heating station in the urban area, including the supply and return water temperature, heat, flow, pressure, outdoor temperature, humidity, wind speed, as well as holidays and special event factors of the primary network pressure isolation station and each heating station in the urban area;

[0016] The ratio between the heat supply on the side of the primary network pressure-isolating station in the urban area and the total heat demand of each heating station is taken as the supply-demand imbalance parameter. When the supply-demand imbalance parameter is equal to 1, it indicates that the supply and demand between the primary network pressure-isolating station and each heating station in the urban area are balanced; when the supply-demand imbalance parameter is greater than 1, it indicates that the supply between the primary network pressure-isolating station and each heating station in the urban area is greater than the demand, and if the supply-demand imbalance parameter is in the first preset interval, the primary network in the urban area is in the first type of supply-demand imbalance operation condition; when the supply-demand imbalance parameter is less than 1, it indicates that the supply between the primary network pressure-isolating station and each heating station in the urban area is less than the demand, and if the supply-demand imbalance parameter is in the second preset interval, the primary network in the urban area is in the second type of supply-demand imbalance operation condition;

[0017] After data preprocessing and data feature extraction of the operating data of the primary network pressure isolation station and each heating station in the urban area, the extracted data features are used as input and the supply and demand imbalance operating conditions of the primary network in the urban area are used as output. After training and learning with the machine learning algorithm, a supply and demand imbalance operating condition identification model for the primary network in the urban area is established to identify the supply and demand imbalance operating conditions of the primary network in the urban area, and at the same time obtain the supply and demand imbalance time period, supply and demand imbalance operating condition category and supply and demand imbalance heat value.

[0018] Further, the S2 specifically includes:

[0019] According to the imbalanced supply and demand operation condition identification model of the primary network in the urban area, the historical imbalanced supply and demand operation condition information of the primary network in the urban area and the imbalanced supply and demand operation condition information at future moments are obtained, and the demand fluctuation is evaluated to determine the capacity demand of the heat storage tank;

[0020] Select a location to install a heat storage tank in the long-distance heat transmission network outside the city between the heat source and the pressure isolation station of the original long-distance heat transmission system, and arrange water pumps, valves and instruments connected to the heat storage tank. At the same time, connect the heat storage tank with the long-distance heat transmission network outside the city and the pressure isolation station through additional pipelines;

[0021] The heat storage tank is used as a heat source with flexible flow adjustment. The heat storage and release characteristics of the heat storage tank are utilized to store excess heat supplied by the long-distance heat network to the primary network in the urban area, and to make up for the missing heat supplied by the long-distance heat network to the primary network in the urban area. The imbalanced supply and demand operating condition of the primary network in the urban area is adjusted to a balanced supply and demand operating condition, forming a long-distance heating system that coordinates the long-distance heat network outside the urban area with heat storage tanks and the primary network in the urban area.

[0022] Further, the S3 specifically includes:

[0023] Under the first type of supply-demand imbalance operating condition where supply exceeds demand, the heat storage mode of the heat storage tank is started to absorb the excess heat of the long-distance heat transmission network and store it in the heat storage tank, and the remaining flow is transmitted to the primary network in the urban area through the long-distance heat transmission network; in order to meet the supply-demand balance operating condition, the total flow demand on the pressure isolation station side is equal to the sum of the flow demands of each thermal power station, and the heat storage flow of the heat storage tank is preliminarily set according to the calorific value of supply exceeding demand and the calorific value of the long-distance heat transmission network;

[0024] Under the second type of supply-demand imbalance operating condition where supply is less than demand, the heat release mode of the heat storage tank is started, and the heat stored in the heat storage tank is re-injected into the long-distance heat transmission network to adjust the flow of the long-distance heat transmission network to the primary network in the urban area to ensure that the total flow demand on the pressure isolation station side is met; to meet the supply-demand balance operating condition, the total flow demand on the pressure isolation station side is equal to the sum of the flow demands of each thermal power station, and the heat release flow of the heat storage tank is preliminarily set according to the calorific value of supply less than demand, the calorific value of the long-distance heat transmission network, and the heat storage capacity;

[0025] Under the supply and demand balance operating condition, the heat storage tank is not started and does not operate. At this time, the heat supplied by the long-distance heat transmission network meets the total flow demand on the pressure isolation station side, and the total flow on the pressure isolation station side meets the sum of the flow demands of each thermal power station.

[0026] Further, the S4 specifically includes:

[0027] The supply and return water pipelines of the long-distance heat supply system connect the heat source and the user side. The hot water from the heat source flows into the pressure isolation station and each thermal power station through the water supply pipeline of the long-distance heat supply network. After heat exchange, the return water returns to the heat source through the return water pipeline of the long-distance heat supply network.

[0028] When the long-distance heating system is operated and adjusted, the hydraulic condition will transition from one steady state to another. In the transition stage, a hydraulic condition calculation model of the long-distance heating system is established to describe the dynamic changes of flow and pressure in the pipeline. The binary functions H(x, t) and Q(x, t) about time t and position x along the pipe length are expressed as:

[0029]

[0030] Q is the flow distribution; g is the gravitational acceleration; A is the cross-sectional area of ​​the pipe; H is the pressure distribution; f is the hydraulic friction coefficient; D is the inner diameter of the pipe; and a is the water hammer wave velocity.

[0031] Further, the S5 specifically includes:

[0032] After predicting and accumulating the change trend of heat load demand of each thermal power station, the change of heat load demand of the pressure isolation station is known, and a model Q is established between the initial allocated flow of the pressure isolation station and the heat load demand of the pressure isolation station and other factors affecting the flow of the pressure isolation station. gyz =f(P gyz ,tgyz,供 ,t gyz,回 ,H gyz,管网 ,E,R), used to describe the heat load demand P at the pressure isolation station gyz , Water supply temperature of the pressure isolation station network t gyz,供 , return water temperature of the pressure isolation station network t gyz,回 , Pressure isolation station network pressure H gyz,管网 and environmental parameters E, user behavior R, make a preliminary allocation of the total flow demand value on the pressure isolation station side;

[0033] Establish a model Q between the heat source supply to the long-distance heat transmission network and the heat load output plan of the heat source unit and other factors affecting the heat source supply to the long-distance heat transmission network rw =f(P jz ,t rw,供 ,t rw,回 ,H rw , S), used to describe the heat load output plan P of the heat source unit jz , long distance heat transmission network water supply temperature t rw,供 , long distance heat transmission network return water temperature t rw,回 , Long-distance heat transmission network pressure H rw and the external variable conditions S of the heat source units, make a preliminary allocation of the heat source supply flow to the long-distance heat transmission network;

[0034] Based on the supply and demand imbalance operation condition identification model of the primary network in the urban area, the supply and demand imbalance operation conditions of the primary network in the urban area in different time periods in the future are identified, and the supply and demand imbalance time period, supply and demand imbalance operation condition category and supply and demand imbalance heat value are obtained. In addition, the preliminary allocation results of the heat source supply flow to the long-distance heat transmission network, the heat loss of the long-distance heat transmission network and the preliminary allocation results of the total flow demand value on the pressure isolation station side are combined to preliminarily allocate the heat storage and release flow of the heat storage tank in different time periods;

[0035] Based on the hydraulic condition calculation model of the long-distance heating system, the flow distribution results of the heat source supplying the long-distance heating network, heat storage tanks and pressure isolation station in each period are simulated, the impact of the heat storage tank on the hydraulic condition of the heating network when storing and releasing heat is analyzed, and the pressure, flow and temperature distribution of each node are calculated. An optimization algorithm is introduced to achieve the goal of meeting the supply and demand balance and minimizing energy consumption. At the same time, it is ensured that the flow distribution meets the safe operation requirements of the long-distance heating system and the hydraulic condition balance conditions of the long-distance heating system, and the final flow distribution of the heat source supplying the long-distance heating network, heat storage tanks and pressure isolation stations in each period is carried out.

[0036] Furthermore, in S6, based on the flow distribution results of the heat source supplying the long-distance heat transmission network, the heat storage tank and the pressure isolation station in each period, the corresponding pumps and valves connected to the long-distance heat transmission network are regulated, specifically including:

[0037] Flow distribution results based on heat source supply to long-distance heat transmission network Q rw, the heat storage and release flow distribution result of the heat storage tank Q cr And the flow distribution result of the pressure isolation station Q gyz , while monitoring the real-time operation data of each device in the entire network qw 、Equipment health status jk 、The whole network hydraulic condition W hr , establish the pump valve control model (pump, valve) = f(Q rw ,Q cr ,Q gyz ,S qw ,E jk ,W hr ), set the control strategy for the connected pump groups and valves, including at least the operating power of the pump and the valve opening.

[0038] Furthermore, the hydraulic conditions of the entire network at least include: the hydraulic conditions of the entire network when starting and stopping pumps, the hydraulic conditions of the entire network when developing and closing valves, and the hydraulic conditions of the entire network under variable flow operation.

[0039] Furthermore, in S6, according to the control target temperature of each thermal power station, the total flow of the pressure isolation station is distributed to each thermal power station as needed, specifically including:

[0040] A control target temperature is set for each thermal power station based on the heat load demand of each thermal power station, and a flow demand value of each thermal power station is obtained according to the control target temperature set for each thermal power station;

[0041] According to the flow demand value of each thermal power station, the flow on the pressure isolation station side is allocated to each thermal power station as needed.

[0042] Furthermore, the supply and demand balance scheduling method for the long-distance heating system also includes: setting multi-dimensional evaluation indicators, including hydraulic uncontrolled scheduling, hydraulic stability, supply and demand balance coefficient, and energy saving rate, to evaluate the flow distribution and water pump and valve control effects.

[0043] The beneficial effects of the present invention are:

[0044] (1) The present invention can effectively and accurately know the supply and demand status of the primary network in the urban area, including supply and demand balance and oversupply and undersupply imbalance, as well as imbalanced heat and time period, by establishing an identification model for the supply and demand imbalance operation of the primary network in the urban area; and by adding a heat storage tank to the long-distance heat transmission network outside the urban area and setting the heat storage and release flow regulation characteristics of the heat storage tank, so as to transform the supply and demand imbalance problem of the primary network in the urban area into the flow regulation problem of the long-distance heat transmission network outside the urban area, and realize the use of the heat storage tank to flexibly adjust the flow of the long-distance heat transmission network to the primary network in the urban area, and adjust the supply and demand imbalance operation condition to the supply and demand balance operation condition;

[0045] (2) Since the long-distance heat supply system has a long transmission distance and a large pipe diameter, its dynamic hydraulic fluctuation characteristics are obvious. When the long-distance heat supply network is adjusted, the flow rate and pressure of hot water in the long-distance pipeline also change dynamically. Therefore, a hydraulic condition calculation model of the long-distance heat supply system coordinated with the long-distance heat supply network outside the urban area containing the heat storage tank and the primary network in the urban area is established. It can comprehensively consider the supply and demand imbalance operation conditions and the changes in heat load demand, simulate the actual operation of the pipeline network flow, analyze the flow distribution, and the influence of the heat storage tank on the hydraulic condition of the long-distance heat supply network when storing and releasing heat, and reasonably distribute the flow of heat source supply to the long-distance heat supply network, heat storage tank and pressure isolation station in each period, which can not only ensure the hydraulic balance of the long-distance heat supply system, but also achieve supply and demand balance;

[0046] (3) Based on the flow distribution results of the heat source supplying the long-distance heat transmission network, the heat storage tank and the pressure isolation station in each period, the present invention regulates the corresponding water pumps and valves connected to the long-distance heat transmission network, and distributes the total flow of the pressure isolation station to each thermal power station as needed according to the control target temperature of each thermal power station; it can accurately control the operation of water pumps and valves, and ensure that each thermal power station area can obtain appropriate heat, realize on-demand distribution, and reduce energy consumption.

[0047] Other features and advantages will be described in the following description, and partly become apparent from the description, or understood by practicing the invention. The purpose and other advantages of the invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0048] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0050] Figure 1 This is a flow chart of a method for balancing supply and demand in a long-distance heat supply system based on heat storage tank flow regulation according to the present invention;

[0051] Figure 2 It is a schematic structural diagram of a long-distance heat supply system including a heat storage tank according to the present invention. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] Example 1

[0054] like Figure 1 , Figure 2 As shown, this embodiment 1 provides a method for balancing supply and demand of a long-distance heat supply system based on heat storage tank flow regulation, which includes:

[0055] S1. Obtain the operation data of the primary network pressure isolation station and each heating station in the urban area, and establish an identification model for the imbalanced operation condition of the primary network supply and demand in the urban area to identify the imbalanced operation condition of the primary network supply and demand in the urban area;

[0056] S2. Add a heat storage tank to the long-distance heat transmission network outside the urban area between the heat source and the pressure isolation station of the original long-distance heat transmission system. At the same time, after the heat storage tank is connected with the long-distance heat transmission network outside the urban area and the pressure isolation station, the flow of the long-distance heat transmission network to the primary network in the urban area can be flexibly adjusted through the heat storage tank, and the imbalanced supply and demand operation condition of the primary network in the urban area can be adjusted to the balanced supply and demand operation condition, forming a long-distance heat transmission system that coordinates the long-distance heat transmission network outside the urban area with the heat storage tank and the primary network in the urban area;

[0057] S3. Setting the heat storage and release flow regulation characteristics of the heat storage tank of the long heat transmission network outside the urban area, including: when the heat storage tank is storing heat, part of the flow of the long heat transmission network outside the urban area is stored in the heat storage tank, and when the heat storage tank is releasing heat, the flow of the heat storage tank is released to the long heat transmission network outside the urban area, and the heat storage and release of the heat storage tank is used to meet the supply and demand balance of the primary network in the urban area. At the same time, the total flow demand of the pressure isolation station changes with the heat load demand of each thermal power station and is not affected by the heat storage and release of the heat storage tank;

[0058] S4. Establish a hydraulic condition calculation model for the long-distance heat supply system that coordinates the long-distance heat supply network outside the urban area with heat storage tanks and the primary network within the urban area;

[0059] S5. Based on the hydraulic condition calculation model of the long-distance heat supply system and the heat storage and release flow regulation characteristics of the heat storage tank of the long-distance heat supply network outside the urban area, combined with the heat load demand changes of the pressure isolation station, the identification information of the supply and demand imbalance operation condition of the primary network in the urban area, and the analysis of flow distribution, the impact of the heat storage tank on the hydraulic condition of the long-distance heat supply network when storing and releasing heat, the flow of heat source supply to the long-distance heat supply network, heat storage tank and pressure isolation station in each period is distributed;

[0060] S6. Based on the flow distribution results of the heat source supplying the long-distance heat transmission network, heat storage tanks and pressure isolation stations in each period, the corresponding water pumps and valves connected to the long-distance heat transmission network are regulated, and according to the control target temperature of each thermal power station, the total flow of the pressure isolation station is allocated to each thermal power station as needed.

[0061] In this embodiment, S1 specifically includes:

[0062] Obtain the operating data of the primary network pressure isolation station and each heating station in the urban area, including the supply and return water temperature, heat, flow, pressure, outdoor temperature, humidity, wind speed, as well as holidays and special event factors of the primary network pressure isolation station and each heating station in the urban area;

[0063] The ratio between the heat supply on the side of the primary network pressure-isolating station in the urban area and the total heat demand of each heating station is taken as the supply-demand imbalance parameter. When the supply-demand imbalance parameter is equal to 1, it indicates that the supply and demand between the primary network pressure-isolating station and each heating station in the urban area are balanced; when the supply-demand imbalance parameter is greater than 1, it indicates that the supply between the primary network pressure-isolating station and each heating station in the urban area is greater than the demand, and if the supply-demand imbalance parameter is in the first preset interval, the primary network in the urban area is in the first type of supply-demand imbalance operation condition; when the supply-demand imbalance parameter is less than 1, it indicates that the supply between the primary network pressure-isolating station and each heating station in the urban area is less than the demand, and if the supply-demand imbalance parameter is in the second preset interval, the primary network in the urban area is in the second type of supply-demand imbalance operation condition;

[0064] After data preprocessing and data feature extraction of the operating data of the primary network pressure isolation station and each heating station in the urban area, the extracted data features are used as input and the supply and demand imbalance operating conditions of the primary network in the urban area are used as output. After training and learning with the machine learning algorithm, a supply and demand imbalance operating condition identification model for the primary network in the urban area is established to identify the supply and demand imbalance operating conditions of the primary network in the urban area, and at the same time obtain the supply and demand imbalance time period, supply and demand imbalance operating condition category and supply and demand imbalance heat value.

[0065] In actual applications, the operating conditions of the primary network in the urban area include supply and demand balance operating conditions, the first type of supply and demand imbalance operating conditions (oversupply), and the second type of supply and demand imbalance operating conditions (undersupply); when in the first type of supply and demand imbalance operating conditions, it indicates that the supply and demand imbalance parameter is significantly greater than 1, and the scheduling plan needs to be adjusted in time. The first preset interval is set to distinguish the range interval of the oversupply imbalance parameter. Only when it is within this interval is it defined as the first type of supply and demand imbalance operating condition. If the supply and demand imbalance parameter is greater than 1, but not in the first preset interval, it indicates that the operating condition of supply exceeding demand is not very significant, and the scheduling plan does not need to be adjusted; when in the second type of supply and demand imbalance operating condition, it indicates that the supply and demand imbalance parameter is significantly less than 1, and the scheduling plan needs to be adjusted in time. The second preset interval is set to distinguish the range interval of the undersupply imbalance parameter. Only when it is within this interval is it defined as the second type of supply and demand imbalance operating condition. If the supply and demand imbalance parameter is less than 1, but not in the second preset interval, it indicates that the operating condition of supply less than demand is not very significant, and the scheduling plan does not need to be adjusted.

[0066] In actual applications, after training and learning with a machine learning algorithm, a BPNN algorithm is specifically used to establish a model for identifying the imbalanced operating conditions of the primary network in urban areas. The BPNN consists of an input layer, a hidden layer, and an output layer. The input layer is used to receive external data. There can be one or more hidden layers in the hidden layer. Every two hidden layers are composed of multiple neurons for processing and converting input data. The output layer is used to generate the final result.

[0067] How BPNN works:

[0068] 1) Forward propagation: refers to the input signal from the input layer to the hidden layer, and then to the output layer. Specifically, the input data is passed from the input layer to the first hidden layer; in each neuron, the input data is weighted and summed, and nonlinearly transformed by the activation function; the result is passed to the next hidden layer until it reaches the output layer, generating the model output result;

[0069] 2) Calculate the error: Compare the result of the output layer with the actual target value and calculate the error;

[0070] 3) Back propagation: Starting from the output layer, the error gradient of each layer is calculated in reverse based on the error; using the gradient descent method or other optimization algorithms, the weight of each layer is adjusted according to the error gradient to reduce the total error;

[0071] 4) Iterative training: Repeat the forward propagation and back propagation process until the predetermined number of training times is reached or the error reaches an acceptable level.

[0072] The calculation formulas of the hidden layer and the output layer are expressed as:

[0073]

[0074] H j-1 is the hidden layer output; w im-1 is the neuron weight; x i is the input data; b j-1 is the neuron threshold; f is the hidden layer activation function; H k-2 is the output result of the output layer, indicating the identification result of the imbalanced operation condition of the primary network supply and demand in the urban area; w mk-2 is the neuron weight; b k-2 is the neuron threshold.

[0075] The weights and thresholds of the BPNN algorithm are optimized using an improved atomic search optimization algorithm. In the atomic search optimization algorithm ASO, the position of each atom in the search space corresponds to a solution of an atom with a specific mass. The quality of the solution corresponds to the size of the mass, and the better the solution, the greater the atomic mass. All atoms in the group will attract or repel each other according to the distance between them. Heavier atoms have smaller acceleration and can strongly seek better solutions in the local space; lighter atoms have greater acceleration capabilities and can search extensively in the entire search space to find areas with better solutions.

[0076] The random setting method of population initialization of the Tent mapping optimization ASO algorithm is used to map the variables to the value interval of the Tent mapping variables, and the feasible solution is linearly transformed into the optimization variable space to overcome the problem of falling into the local optimum, which is expressed as:

[0077]

[0078] The adaptive variable spiral search strategy in the whale optimization algorithm is used to improve the atomic individual position update process and enhance the global search capability of the ASO algorithm. The spiral search strategy of the whale optimization algorithm is expressed as:

[0079] x(t+1)=De bl cos(2πl)+x * (t);

[0080] D=|2rx * (t)-x(t)|;

[0081] x(t+1) is the position of the individual whale at iteration t+1; D is the distance between the optimal individual whale and the prey; x * is the global optimal individual position; b is a constant that defines the shape of the spiral position; l is a random number between [-1,1]; r is a random variable between [0,1];

[0082] The spiral search strategy is applied to the process of updating the individual atomic positions, and the inertia weight τ is introduced. The aim is to gradually enhance the influence of the optimal atom in the later stages of iteration, so that it can quickly converge to the optimal position;

[0083] The constant b of the spiral position shape is changed to a parameter that changes with the number of iterations, and the spiral shape is dynamically adjusted to expand the global search area of ​​atoms and improve its global search capability. The variable spiral parameter is expressed as:

[0084]

[0085] In the early stage of algorithm iteration, other atomic individuals perform global search within the maximum spatial range, and gradually approach the optimal feasible solution in the later stage of iteration, which can improve the global search capability and optimization solution accuracy. The position update is expressed as:

[0086]

[0087] is the position of the ith atom; d is the dimension of the atom population; is the velocity of the ith atom.

[0088] In this embodiment, S2 specifically includes:

[0089] According to the imbalanced supply and demand operation condition identification model of the primary network in the urban area, the historical imbalanced supply and demand operation condition information of the primary network in the urban area and the imbalanced supply and demand operation condition information at future moments are obtained, and the demand fluctuation is evaluated to determine the capacity demand of the heat storage tank;

[0090] Select a location to install a heat storage tank in the long-distance heat transmission network outside the city between the heat source and the pressure isolation station of the original long-distance heat transmission system, and arrange water pumps, valves and instruments connected to the heat storage tank. At the same time, connect the heat storage tank with the long-distance heat transmission network outside the city and the pressure isolation station through additional pipelines;

[0091] The heat storage tank is used as a heat source with flexible flow adjustment. The heat storage and release characteristics of the heat storage tank are utilized to store excess heat supplied by the long-distance heat network to the primary network in the urban area, and to make up for the missing heat supplied by the long-distance heat network to the primary network in the urban area. The imbalanced supply and demand operating condition of the primary network in the urban area is adjusted to a balanced supply and demand operating condition, forming a long-distance heating system that coordinates the long-distance heat network outside the urban area with heat storage tanks and the primary network in the urban area.

[0092] In actual applications, in addition to installing heat storage tanks, a heating boiler can be added next to the heat storage tank according to actual needs. Under the supply and demand imbalance operating conditions where the primary network supply is less than the demand in the urban area, if the heat storage in the heat storage tank is not enough to meet the supply and demand deviation, the heating boiler can be started quickly. The heat can be directly supplied to the long-distance heat transmission network to increase the heating capacity of the long-distance heat transmission network. The heating boiler can also supply excess heat outside the long-distance heat transmission network to the heat storage tank to improve the heating regulation capacity of the heat storage tank. By using the heating boiler and the heat storage tank reasonably, the heat load curve can be smoothed in different time periods to avoid unstable operation due to excessive fluctuations in the heat load. In addition, the heating boiler can be an electric boiler, which stores heat at night or when the electricity price is low, and then releases it when the electricity price is high or the heat load is at peak, reducing the operating cost. The heating boiler usually has a high startup cost and energy consumption. By using it in conjunction with the heat storage tank, its frequent start and stop times can be reduced, the equipment life can be extended, and the overall energy efficiency can be improved.

[0093] In this embodiment, S3 specifically includes:

[0094] Under the first type of supply-demand imbalance operating condition where supply exceeds demand, the heat storage mode of the heat storage tank is started to absorb the excess heat of the long-distance heat transmission network and store it in the heat storage tank, and the remaining flow is transmitted to the primary network in the urban area through the long-distance heat transmission network; in order to meet the supply-demand balance operating condition, the total flow demand on the pressure isolation station side is equal to the sum of the flow demands of each thermal power station, and the heat storage flow of the heat storage tank is preliminarily set according to the calorific value of supply exceeding demand and the calorific value of the long-distance heat transmission network;

[0095] Under the second type of supply-demand imbalance operating condition where supply is less than demand, the heat release mode of the heat storage tank is started, and the heat stored in the heat storage tank is re-injected into the long-distance heat transmission network to adjust the flow of the long-distance heat transmission network to the primary network in the urban area to ensure that the total flow demand on the pressure isolation station side is met; to meet the supply-demand balance operating condition, the total flow demand on the pressure isolation station side is equal to the sum of the flow demands of each thermal power station, and the heat release flow of the heat storage tank is preliminarily set according to the calorific value of supply less than demand, the calorific value of the long-distance heat transmission network, and the heat storage capacity;

[0096] Under the supply and demand balance operating condition, the heat storage tank is not started and does not operate. At this time, the heat supplied by the long-distance heat transmission network meets the total flow demand on the pressure isolation station side, and the total flow on the pressure isolation station side meets the sum of the flow demands of each thermal power station.

[0097] In this embodiment, S4 specifically includes:

[0098] The supply and return water pipelines of the long-distance heat supply system connect the heat source and the user side. The hot water from the heat source flows into the pressure isolation station and each thermal power station through the water supply pipeline of the long-distance heat supply network. After heat exchange, the return water returns to the heat source through the return water pipeline of the long-distance heat supply network.

[0099] When the long-distance heating system is operated and adjusted, the hydraulic condition will transition from one steady state to another. In the transition stage, a hydraulic condition calculation model of the long-distance heating system is established to describe the dynamic changes of flow and pressure in the pipeline. The binary functions H(x, t) and Q(x, t) about time t and position x along the pipe length are expressed as:

[0100]

[0101] Q is the flow distribution; g is the gravitational acceleration; A is the cross-sectional area of ​​the pipe; H is the pressure distribution; f is the hydraulic friction coefficient; D is the inner diameter of the pipe; and a is the water hammer wave velocity.

[0102] In practical applications, the solution of the hydraulic condition calculation model of the long-distance heating system includes:

[0103] Determine the parameters to be used in the calculation process of each spatial step and time step;

[0104] Determine the flow and pressure parameters at each node at the initial moment and the first time step before hydraulic fluctuation occurs;

[0105] The hydraulic parameters at all nodes obtained at the end of the first time step are taken as the initial parameters for the next time step;

[0106] The time step is gradually advanced until the hydraulic fluctuation ends and the hydraulic conditions inside the pipe reach a steady state.

[0107] In this embodiment, S5 specifically includes:

[0108] After predicting and accumulating the change trend of heat load demand of each thermal power station, the change of heat load demand of the pressure isolation station is known, and a model Q is established between the initial allocated flow of the pressure isolation station and the heat load demand of the pressure isolation station and other factors affecting the flow of the pressure isolation station. gyz =f(P gyz ,t gyz,供 ,t gyz,回 ,H gyz,管网 ,E,R), used to describe the heat load demand P at the pressure isolation station gyz , Water supply temperature of the pressure isolation station network t gyz,供 , return water temperature of the pressure isolation station network t gyz,回 , Pressure isolation station network pressure H gyz,管网 and environmental parameters E, user behavior R, make a preliminary allocation of the total flow demand value on the pressure isolation station side;

[0109] Establish a model Q between the heat source supply to the long-distance heat transmission network and the heat load output plan of the heat source unit and other factors affecting the heat source supply to the long-distance heat transmission network rw =f(P jz ,trw,供 ,t rw,回 ,H rw , S), used to describe the heat load output plan P of the heat source unit jz , long distance heat transmission network water supply temperature t rw,供 , long distance heat transmission network return water temperature t rw,回 , Long-distance heat transmission network pressure H rw and the external variable conditions S of the heat source units, make a preliminary allocation of the heat source supply flow to the long-distance heat transmission network;

[0110] Based on the supply and demand imbalance operation condition identification model of the primary network in the urban area, the supply and demand imbalance operation conditions of the primary network in the urban area in different time periods in the future are identified, and the supply and demand imbalance time period, supply and demand imbalance operation condition category and supply and demand imbalance heat value are obtained. In addition, the preliminary allocation results of the heat source supply flow to the long-distance heat transmission network, the heat loss of the long-distance heat transmission network and the preliminary allocation results of the total flow demand value on the pressure isolation station side are combined to preliminarily allocate the heat storage and release flow of the heat storage tank in different time periods;

[0111] Based on the hydraulic condition calculation model of the long-distance heating system, the flow distribution results of the heat source supplying the long-distance heating network, heat storage tanks and pressure isolation station in each period are simulated, the impact of the heat storage tank on the hydraulic condition of the heating network when storing and releasing heat is analyzed, and the pressure, flow and temperature distribution of each node are calculated. An optimization algorithm is introduced to achieve the goal of meeting the supply and demand balance and minimizing energy consumption. At the same time, it is ensured that the flow distribution meets the safe operation requirements of the long-distance heating system and the hydraulic condition balance conditions of the long-distance heating system, and the final flow distribution of the heat source supplying the long-distance heating network, heat storage tanks and pressure isolation stations in each period is carried out.

[0112] In this embodiment, in S6, based on the flow distribution results of the heat source supplying the long-distance heat transmission network, the heat storage tank and the pressure isolation station in each period, the corresponding pumps and valves connected to the long-distance heat transmission network are regulated, specifically including:

[0113] Flow distribution results based on heat source supply to long-distance heat transmission network Q rw , the heat storage and release flow distribution result of the heat storage tank Q cr And the flow distribution result of the pressure isolation station Q gyz , while monitoring the real-time operation data of each device in the entire network qw 、Equipment health status jk 、The whole network hydraulic condition W hr , establish the pump valve control model (pump, valve) = f(Q rw ,Q cr ,Q gyz ,S qw ,E jk ,W hr ), set the control strategy for the connected pump groups and valves, including at least the operating power of the pump and the valve opening.

[0114] In this embodiment, the whole network hydraulic conditions include at least: the whole network hydraulic conditions of starting and stopping pumps, the whole network hydraulic conditions of development and valve closing, and the whole network hydraulic conditions under variable flow operation.

[0115] In this embodiment, in S6, according to the control target temperature of each thermal power station, the total flow of the pressure isolation station is distributed to each thermal power station as needed, specifically including:

[0116] A control target temperature is set for each thermal power station based on the heat load demand of each thermal power station, and a flow demand value of each thermal power station is obtained according to the control target temperature set for each thermal power station;

[0117] According to the flow demand value of each thermal power station, the flow on the pressure isolation station side is allocated to each thermal power station as needed.

[0118] In actual applications, a reasonable control target temperature is set for each thermal power station based on the heat load demand, combined with historical data and empirical formulas; the control target temperature should be able to meet the indoor temperature requirements of heat users, while avoiding excessive heating and achieving energy saving and consumption reduction;

[0119] According to the load of the thermal power station, the control target temperature and the performance parameters of the circulating water pump in the station, the flow demand value required to meet the heating load is calculated; the flow demand value should be able to ensure that the supply water temperature and return water temperature in the thermal power station remain within the set control target temperature range;

[0120] Install flow meters and regulating valves on the pressure isolation station side to monitor and adjust the flow of the pressure isolation station in real time; ensure that the flow on the pressure isolation station side can meet the total flow demand of all thermal power stations;

[0121] According to the flow demand value of each thermal power station, the flow on the pressure isolation station side is distributed to each thermal power station as needed through regulating valves and control systems.

[0122] In this embodiment, the supply and demand balance scheduling method of the long-distance heating system also includes: setting multi-dimensional evaluation indicators, including hydraulic uncontrolled scheduling, hydraulic stability, supply and demand balance coefficient, energy saving rate, and evaluating the flow distribution and water pump and valve control effects.

[0123] In several embodiments provided in the present application, it should be understood that the disclosed system and method can also be implemented in other ways. The system embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the systems, methods and computer program products according to multiple embodiments of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and a part of the module, program segment or code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0124] In addition, the functional modules in each embodiment of the present invention can be integrated together to form an independent part, or each module can exist separately, or two or more modules can be integrated to form an independent part. If the function is implemented in the form of a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, RandomAccess Memory), disk or optical disk and other media that can store program codes.

[0125] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A method for balancing supply and demand in a long-distance heat supply system based on heat storage tank flow regulation, characterized in that: It includes: S1. Obtain the operation data of the primary network pressure isolation station and each heating station in the urban area, and establish an identification model for the imbalanced operation condition of the primary network supply and demand in the urban area to identify the imbalanced operation condition of the primary network supply and demand in the urban area; S2. Add a heat storage tank to the long-distance heat transmission network outside the urban area between the heat source and the pressure isolation station of the original long-distance heat transmission system. At the same time, after the heat storage tank is connected with the long-distance heat transmission network outside the urban area and the pressure isolation station, the flow of the long-distance heat transmission network to the primary network in the urban area can be flexibly adjusted through the heat storage tank, and the imbalanced supply and demand operation condition of the primary network in the urban area can be adjusted to the balanced supply and demand operation condition, forming a long-distance heat transmission system that coordinates the long-distance heat transmission network outside the urban area with the heat storage tank and the primary network in the urban area; S3. Setting the heat storage and release flow regulation characteristics of the heat storage tank of the long heat transmission network outside the urban area, including: when the heat storage tank is storing heat, part of the flow of the long heat transmission network outside the urban area is stored in the heat storage tank, and when the heat storage tank is releasing heat, the flow of the heat storage tank is released to the long heat transmission network outside the urban area, and the heat storage and release of the heat storage tank is used to meet the supply and demand balance of the primary network in the urban area. At the same time, the total flow demand of the pressure isolation station changes with the heat load demand of each thermal power station and is not affected by the heat storage and release of the heat storage tank; S4. Establish a hydraulic condition calculation model for the long-distance heat supply system that coordinates the long-distance heat supply network outside the urban area with heat storage tanks and the primary network within the urban area; S5. Based on the hydraulic condition calculation model of the long-distance heat supply system and the heat storage and release flow regulation characteristics of the heat storage tank of the long-distance heat supply network outside the urban area, combined with the heat load demand changes of the pressure isolation station, the identification information of the supply and demand imbalance operation condition of the primary network in the urban area, and the analysis of flow distribution, the impact of the heat storage tank on the hydraulic condition of the long-distance heat supply network when storing and releasing heat, the flow of heat source supply to the long-distance heat supply network, heat storage tank and pressure isolation station in each period is distributed; S6. Based on the flow distribution results of the heat source supplying the long-distance heat transmission network, heat storage tanks and pressure isolation stations in each period, the corresponding water pumps and valves connected to the long-distance heat transmission network are regulated, and according to the control target temperature of each thermal power station, the total flow of the pressure isolation station is allocated to each thermal power station as needed.

2. The method for balancing supply and demand of a long-distance heat supply system according to claim 1 is characterized in that: The S1 specifically includes: Obtain the operating data of the primary network pressure isolation station and each heating station in the urban area, including the supply and return water temperature, heat, flow, pressure, outdoor temperature, humidity, wind speed, as well as holidays and special event factors of the primary network pressure isolation station and each heating station in the urban area; The ratio between the heat supply on the side of the primary network pressure-isolating station in the urban area and the total heat demand of each heating station is taken as the supply-demand imbalance parameter. When the supply-demand imbalance parameter is equal to 1, it indicates that the supply and demand between the primary network pressure-isolating station and each heating station in the urban area are balanced; when the supply-demand imbalance parameter is greater than 1, it indicates that the supply between the primary network pressure-isolating station and each heating station in the urban area is greater than the demand, and if the supply-demand imbalance parameter is in the first preset interval, the primary network in the urban area is in the first type of supply-demand imbalance operation condition; when the supply-demand imbalance parameter is less than 1, it indicates that the supply between the primary network pressure-isolating station and each heating station in the urban area is less than the demand, and if the supply-demand imbalance parameter is in the second preset interval, the primary network in the urban area is in the second type of supply-demand imbalance operation condition; After data preprocessing and data feature extraction of the operating data of the primary network pressure isolation station and each heating station in the urban area, the extracted data features are used as input and the supply and demand imbalance operating conditions of the primary network in the urban area are used as output. After training and learning with the machine learning algorithm, a supply and demand imbalance operating condition identification model for the primary network in the urban area is established to identify the supply and demand imbalance operating conditions of the primary network in the urban area, and at the same time obtain the supply and demand imbalance time period, supply and demand imbalance operating condition category and supply and demand imbalance heat value.

3. The method for balancing supply and demand of a long-distance heat supply system according to claim 1, characterized in that: The S2 specifically includes: According to the imbalanced supply and demand operation condition identification model of the primary network in the urban area, the historical imbalanced supply and demand operation condition information of the primary network in the urban area and the imbalanced supply and demand operation condition information at future moments are obtained, and the demand fluctuation is evaluated to determine the capacity demand of the heat storage tank; Select a location to install a heat storage tank in the long-distance heat transmission network outside the city between the heat source and the pressure isolation station of the original long-distance heat transmission system, and arrange water pumps, valves and instruments connected to the heat storage tank. At the same time, connect the heat storage tank with the long-distance heat transmission network outside the city and the pressure isolation station through additional pipelines; The heat storage tank is used as a heat source with flexible flow adjustment. The heat storage and release characteristics of the heat storage tank are utilized to store excess heat supplied by the long-distance heat network to the primary network in the urban area, and to make up for the missing heat supplied by the long-distance heat network to the primary network in the urban area. The imbalanced supply and demand operating condition of the primary network in the urban area is adjusted to a balanced supply and demand operating condition, forming a long-distance heating system that coordinates the long-distance heat network outside the urban area with heat storage tanks and the primary network in the urban area.

4. The method for balancing supply and demand of a long-distance heat supply system according to claim 1, characterized in that: The S3 specifically includes: Under the first type of supply-demand imbalance operating condition where supply exceeds demand, the heat storage mode of the heat storage tank is started to absorb the excess heat of the long-distance heat transmission network and store it in the heat storage tank, and the remaining flow is transmitted to the primary network in the urban area through the long-distance heat transmission network; in order to meet the supply-demand balance operating condition, the total flow demand on the pressure isolation station side is equal to the sum of the flow demands of each thermal power station, and the heat storage flow of the heat storage tank is preliminarily set according to the calorific value of supply exceeding demand and the calorific value of the long-distance heat transmission network; Under the second type of supply-demand imbalance operating condition where supply is less than demand, the heat release mode of the heat storage tank is started, and the heat stored in the heat storage tank is re-injected into the long-distance heat transmission network to adjust the flow of the long-distance heat transmission network to the primary network in the urban area to ensure that the total flow demand on the pressure isolation station side is met; to meet the supply-demand balance operating condition, the total flow demand on the pressure isolation station side is equal to the sum of the flow demands of each thermal power station, and the heat release flow of the heat storage tank is preliminarily set according to the calorific value of supply less than demand, the calorific value of the long-distance heat transmission network, and the heat storage capacity; Under the supply and demand balance operating condition, the heat storage tank is not started and does not operate. At this time, the heat supplied by the long-distance heat transmission network meets the total flow demand on the pressure isolation station side, and the total flow on the pressure isolation station side meets the sum of the flow demands of each thermal power station.

5. The method for balancing supply and demand of a long-distance heat supply system according to claim 1, characterized in that: The S4 specifically includes: The supply and return water pipelines of the long-distance heat supply system connect the heat source and the user side. The hot water from the heat source flows into the pressure isolation station and each thermal power station through the water supply pipeline of the long-distance heat supply network. After heat exchange, the return water returns to the heat source through the return water pipeline of the long-distance heat supply network. When the long-distance heating system is operated and adjusted, the hydraulic condition will transition from one steady state to another. In the transition stage, a hydraulic condition calculation model of the long-distance heating system is established to describe the dynamic changes of flow and pressure in the pipeline. The binary functions H(x, t) and Q(x, t) about time t and position x along the pipe length are expressed as: Q is the flow distribution; g is the gravitational acceleration; A is the cross-sectional area of ​​the pipe; H is the pressure distribution; f is the hydraulic friction coefficient; D is the inner diameter of the pipe; and a is the water hammer wave velocity.

6. The method for balancing supply and demand of a long-distance heat supply system according to claim 1, characterized in that: The S5 specifically includes: After predicting and accumulating the change trend of heat load demand of each thermal power station, the change of heat load demand of the pressure isolation station is known, and a model Q is established between the initial allocated flow of the pressure isolation station and the heat load demand of the pressure isolation station and other factors affecting the flow of the pressure isolation station. gyz =f(P gyz ,t gyz,供 ,t gyz,回 ,H gyz,管网 ,E,R), used to describe the heat load demand P at the pressure isolation station gyz , water supply temperature of the pressure isolation station network t gyz,供 , return water temperature of the pressure isolation station network t gyz,回 , Pressure isolation station network pressure H gyz,管网 and environmental parameters E, user behavior R, make a preliminary allocation of the total flow demand value on the pressure isolation station side; Establish a model Q between the heat source supply to the long-distance heat transmission network and the heat load output plan of the heat source unit and other factors affecting the heat source supply to the long-distance heat transmission network rw =f(P jz ,t rw,供 ,t rw,回 ,H rw , S), used to describe the heat load output plan P of the heat source unit jz , long distance heat transmission network water supply temperature t rw,供 , long distance heat transmission network return water temperature t rw,回 , Long-distance heat transmission network pressure H rw and the external variable conditions S of the heat source units, make a preliminary allocation of the heat source supply flow to the long-distance heat transmission network; Based on the supply and demand imbalance operation condition identification model of the primary network in the urban area, the supply and demand imbalance operation conditions of the primary network in the urban area in different time periods in the future are identified, and the supply and demand imbalance time period, supply and demand imbalance operation condition category and supply and demand imbalance heat value are obtained. In addition, the preliminary allocation results of the heat source supply flow to the long-distance heat transmission network, the heat loss of the long-distance heat transmission network and the preliminary allocation results of the total flow demand value on the pressure isolation station side are combined to preliminarily allocate the heat storage and release flow of the heat storage tank in different time periods; Based on the hydraulic condition calculation model of the long-distance heating system, the flow distribution results of the heat source supplying the long-distance heating network, heat storage tanks and pressure isolation station in each period are simulated, the impact of the heat storage tank on the hydraulic condition of the heating network when storing and releasing heat is analyzed, and the pressure, flow and temperature distribution of each node are calculated. An optimization algorithm is introduced to achieve the goal of meeting the supply and demand balance and minimizing energy consumption. At the same time, it is ensured that the flow distribution meets the safe operation requirements of the long-distance heating system and the hydraulic condition balance conditions of the long-distance heating system, and the final flow distribution of the heat source supplying the long-distance heating network, heat storage tanks and pressure isolation stations in each period is carried out.

7. The method for balancing supply and demand of a long-distance heat supply system according to claim 1, characterized in that: In S6, based on the flow distribution results of the heat source supplying the long-distance heat transmission network, the heat storage tank and the pressure isolation station in each period, the corresponding pumps and valves connected to the long-distance heat transmission network are regulated, specifically including: Flow distribution results based on heat source supply to long-distance heat transmission network Q rw , the heat storage and release flow distribution result of the heat storage tank Q cr And the flow distribution result of the pressure isolation station Q gyz , while monitoring the real-time operation data of each device in the entire network qw 、Equipment health status jk 、The whole network hydraulic condition W hr , establish the pump valve control model (pump, valve) = f(Q rw ,Q cr ,Q gyz ,S qw ,E jk ,W hr ), set the control strategy for the connected pump groups and valves, including at least the operating power of the pump and the valve opening.

8. The method for balancing supply and demand of a long-distance heat supply system according to claim 7, characterized in that: The whole network hydraulic conditions at least include: the whole network hydraulic conditions of starting and stopping pumps, the whole network hydraulic conditions of development and valve closing, and the whole network hydraulic conditions under variable flow operation.

9. The method for balancing supply and demand of a long-distance heat supply system according to claim 1, characterized in that: In S6, according to the control target temperature of each thermal power station, the total flow of the pressure isolation station is distributed to each thermal power station as needed, specifically including: A control target temperature is set for each thermal power station based on the heat load demand of each thermal power station, and a flow demand value of each thermal power station is obtained according to the control target temperature set for each thermal power station; According to the flow demand value of each thermal power station, the flow on the pressure isolation station side is allocated to each thermal power station as needed.

10. The method for balancing supply and demand of a long-distance heat supply system according to claim 1, characterized in that: The supply and demand balance scheduling method for the long-distance heating system also includes: setting multi-dimensional evaluation indicators, including hydraulic unscheduled scheduling, hydraulic stability, supply and demand balance coefficient, and energy saving rate, to evaluate the flow distribution and water pump and valve control effects.

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