A gas-electric coupling integrated energy system equivalent circuit modeling method and system

Abstract

The application discloses a kind of gas-electric coupling comprehensive energy system equivalent circuit modeling methods, according to the similarity of energy flow transmission in hydrogen, natural gas and other gas systems and power systems, a new gas-electric equivalent rule with matching energy unit is proposed, the corresponding relationship between the basic state, power and energy parameters of gas and electricity is shown, based on the equivalent rule, the equivalent circuit model of typical link in gas system is established, the equivalent circuit model includes gas pipeline equivalent model, compressor equivalent model, gas load equivalent model, cogeneration unit equivalent model and gas storage device equivalent model.

Description

Technical Field

[0001] This invention belongs to the field of integrated energy system technology, and in particular relates to an equivalent circuit modeling method and system for a gas-electric coupled integrated energy system. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Compared to traditional single-energy systems, integrated energy systems fully consider the complementary substitution and tiered utilization relationships among various heterogeneous energy sources such as electricity and gas, which is of key significance for improving overall energy efficiency and promoting the upgrading of energy system structure. However, due to the time scale differences between different energy flows and their mutual influence through coupling devices, the dynamic characteristics of the system are complex and highly coupled. In traditional energy flow analysis, the modeling methods and analysis approaches for networks such as electricity and gas are different, making it difficult to fundamentally analyze the coupling characteristics of heterogeneous energy networks. This poses certain challenges to the coordinated control, design, and optimization of integrated energy systems.

[0004] Existing equivalent circuit models for integrated energy systems are not perfect. For example, patent number 202211227448.8, entitled "A Method and System for Multi-Energy Flow Joint State Analysis of Integrated Energy Systems", discloses thermoelectric equivalence rules and, based on these rules, obtains the heat transfer equivalent circuit between two nodes of a thermal system during steady-state operation, thus constructing a calculation model for the thermal system. However, integrated energy systems include not only thermal and electrical systems but also gas systems, so existing equivalent circuit models are not perfect. For example, patent number CN202010045108.8, entitled "A Natural Gas Path Modeling Method for Integrated Energy System Operation Control," establishes natural gas path equations that are highly consistent with the network matrix and network equations of power networks in mathematical form. However, this method establishes an equivalent analogy between gas pressure / flow and voltage / current, resulting in units of equivalent power and energy parameters that do not match the circuit. This method can only be used to obtain the gas pressure and flow of the gas network, and then, through existing traditional integrated energy system analysis methods, achieve joint analysis with the power system. It cannot directly transform the analysis of heterogeneous energy flows into the analysis of a single power system. Therefore, how to establish a unified multi-energy flow system model to consistently represent gas systems and power systems is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, this invention provides an equivalent circuit modeling method and system for a gas-electric coupled integrated energy system. Based on the similarity of energy flow transmission between gas systems such as hydrogen and natural gas and electric systems, a new gas-electric equivalence rule with matching energy units is proposed. Based on the gas-electric equivalence rule, equivalent circuit models of typical components of the gas subsystem are established. To achieve the above objectives, one or more embodiments of this invention provide the following technical solutions:

[0006] A method and system for modeling the equivalent circuit of a gas-electric coupled integrated energy system, comprising:

[0007] Establish gas-electric equivalence rules, which are equivalent correspondences between gas and electricity in terms of basic states, power and energy parameters, based on the similarity of the basic characteristics of gas systems and electric systems.

[0008] Based on this equivalence rule, an equivalent circuit model is established in the gas system. The equivalent circuit model includes at least an equivalent model of the gas pipeline, an equivalent model of the compressor, an equivalent model of the gas load, an equivalent model of the combined heat and power unit, and an equivalent model of the gas storage device.

[0009] As an alternative implementation method, an equivalent circuit model of the gas pipeline is established based on the gas-electric equivalence rule. The equivalent circuit model of the gas pipeline includes a first equivalent gas resistance and an equivalent gas induction. The first equivalent gas resistance is obtained according to the gas pipeline pressure drop formula and the gas-electric equivalence rule. The equivalent gas induction is obtained according to the time constant of gas transmission in the pipeline and the virtual resistance.

[0010] As an alternative implementation, the equivalent circuit model of the gas pipeline is composed of an equivalent gas inductance and a first equivalent gas resistance connected in series, and then connected in parallel with a virtual resistor.

[0011] As an alternative implementation method, an equivalent model of the compressor is established based on the gas-electric equivalence rule. The equivalent model of the compressor includes an equivalent gas pressure source and a second equivalent gas resistance. The equivalent gas pressure source is the gas pressure increment provided by the compressor, and the second equivalent gas resistance is obtained based on the equivalent gas pressure source and the compressor pipeline flow rate.

[0012] As an alternative implementation, the equivalent circuit model of the compressor consists of an equivalent pressure source and a second equivalent air resistance connected in series.

[0013] As an alternative implementation method, an equivalent gas load model is established based on the gas-electricity equivalence rule. The equivalent gas load model is established through the third equivalent gas resistance.

[0014] As an alternative implementation method, an equivalent model of a combined heat and power (CHP) unit is established based on the gas-electric equivalence rule. The equivalent model includes a voltage source, a controlled airflow source, a fourth equivalent air resistance, and... The voltage source is the voltage output of the combined heat and power (CHP) unit. The equivalent model of the CHP unit consists of the voltage source and... It consists of a series connection with a controlled airflow source and a fourth equivalent air resistance.

[0015] As an alternative implementation method, an equivalent model of the gas storage device is established based on the gas-electric equivalence rule. The equivalent model of the gas storage device includes an equivalent gas capacity element, wherein the equivalent gas capacity element is obtained according to the capacitance and gas-electric equivalence rules.

[0016] A method and system for modeling the equivalent circuit of a gas-electric coupled integrated energy system, comprising:

[0017] The equivalent circuit model establishment module for gas pipelines is configured to: establish an equivalent circuit model of the gas pipeline based on the gas-electric equivalence rule. The equivalent circuit model of the gas pipeline includes a first equivalent gas resistance and an equivalent gas induction. The first equivalent gas resistance is obtained according to the gas pipeline pressure drop formula and the gas-electric equivalence rule. The equivalent gas induction is obtained according to the time constant of gas transmission in the pipeline and the virtual resistance.

[0018] The compressor equivalent model establishment module is configured to: establish a compressor equivalent model based on the gas-electric equivalent rule. The compressor equivalent model includes an equivalent gas pressure source and a second equivalent gas resistance. The equivalent gas pressure source is the gas pressure increment provided by the compressor. The second equivalent gas resistance is obtained based on the equivalent gas pressure source and the compressor pipeline flow rate.

[0019] The gas load equivalent model establishment module is configured to: establish a gas load equivalent model based on the gas-electric equivalent rule, and the gas load equivalent model is established through the third equivalent gas resistance.

[0020] The equivalent model establishment module for combined heat and power (CHP) units is configured to: establish an equivalent model of the CHP unit based on the gas-electric equivalence rule. The equivalent model of the CHP unit includes a voltage source, a controlled airflow source, a fourth equivalent air resistance, and... The voltage source is the voltage output of the combined heat and power (CHP) unit. The equivalent model of the CHP unit consists of the voltage source and... It consists of a series connection with a controlled airflow source and a fourth equivalent air resistance.

[0021] The equivalent model establishment module for the gas storage device is configured to: establish an equivalent model of the gas storage device based on the gas-electric equivalence rule. The equivalent model of the gas storage device includes equivalent gas capacity elements, wherein the equivalent gas capacity elements are obtained according to the capacitance and gas-electric equivalence rules.

[0022] The above one or more technical solutions have the following beneficial effects:

[0023] The gas-electric equivalence rule proposed in this invention is more reasonable and comprehensive than traditional equivalence rules, showing the equivalent relationships between the basic states, power, and energy parameters of gas-electric systems. This provides a reasonable and practical basis for the consistent representation of gas-electric systems, facilitating the coordinated analysis and calculation of gas-electric energy. Based on this equivalence rule, a unified modeling method for gas systems such as hydrogen and natural gas, as well as power systems, is proposed. Equivalent circuit models of typical components in gas systems are established to comprehensively describe the key characteristics of gas systems, achieving unified analysis of heterogeneous multi-energy flows. Compared with traditional modeling methods, this method can reduce the complexity of joint analysis of power grids and gas grids while maintaining accuracy, laying the foundation for research on the planning, operation, and coordinated optimization scheduling of integrated energy systems.

[0024] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0026] Figure 1 Flowchart of the modeling method of this invention;

[0027] Figure 2 This is the equivalent model of the gas pipeline described in Embodiment 1 of the present invention;

[0028] Figure 3 This is the equivalent model of the compressor described in Embodiment 1 of the present invention;

[0029] Figure 4 This refers to the gas load equivalent model described in Embodiment 1 of the present invention;

[0030] Figure 5 This is the equivalent model of the combined heat and power unit described in Embodiment 1 of the present invention;

[0031] Figure 6 This is an equivalent model of the gas storage device described in Embodiment 1 of the present invention; Detailed Implementation

[0032] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0033] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations of the present invention.

[0034] To better illustrate the modeling method, the gas-electric equivalence rule is first introduced as follows:

[0035] In thermodynamics, the equation of state describing the relationship between pressure, volume, and temperature of an ideal gas in equilibrium is called the ideal gas equation of state:

[0036]

[0037] In the formula, p represents gas pressure, expressed in Pa.

[0038] V – Gas volume, m 3 ;

[0039] n—Amount of substance of the gas, in mol;

[0040] —Molar gas constant, J / (mol·K);

[0041] T – Gas temperature, K.

[0042] The formula for calculating the amount of substance of a gas is as follows:

[0043]

[0044] Where m is the mass of the gas, in kg;

[0045] M – Molar mass of the gas, kg / mol.

[0046] From equations (1) and (2), the gas pressure p at a certain point in the gas pipeline of the gas system can be approximately expressed as:

[0047]

[0048] In the formula, ρ represents the density of the fuel gas, in kg / m³. 3 ;

[0049] R—gas constant of the fuel gas. J / (kg·K).

[0050] The pressure drop in pipelines carrying fuels such as hydrogen and natural gas refers to the pressure drop within the pipeline caused by friction between the gas and the pipeline wall. In any closed loop, the total pressure drop must equal zero; that is, the algebraic sum of the pressure drops across all pipe sections in the loop must equal the algebraic sum of the pressure increases from the compressor. This characteristic can be expressed by the loop pressure balance equation:

[0051] A g Δp k =0 (4)

[0052] In the formula A g —The correlation matrix of the gas network loop;

[0053] Δp k —Pressure drop vector for each pipe section.

[0054] In power systems, Kirchhoff's Voltage Law is the fundamental law of voltage in circuits. It states that in any closed loop, the algebraic sum of the voltage drops across all components is equal to the algebraic sum of the electromotive forces (EMFs). In other words, starting from a point, circling the loop back to that point, the algebraic sum of the voltages across all segments is always zero. Expressed as an equation, for any closed loop in a circuit:

[0055]

[0056] In the formula —The voltage across the k-th element in the circuit.

[0057] The two parameters Δp mentioned above k and They are physically similar, thus establishing the relationship between gas pressure p (Pa) in a gas system and voltage U in an electrical system. e The equivalent analogy relation of (V) is:

[0058] U g =p (6)

[0059] Voltage analogue U g The unit is Pa, or it can be calculated as J / m using p = ρRT. 3 .

[0060] Then, drawing an analogy with the fundamental characteristics of energy transmission, conversion, and consumption in circuits within a power system, the gas power P is proposed. g As electrical power P e The equivalent parameters in the gas system are derived in detail below.

[0061] In a gas system, the equation for gas pipeline flow rate is:

[0062] G=ρvA (7)

[0063] In the formula, G represents the mass flow rate of the gas, in kg / s.

[0064] v — the one-dimensional velocity of gas in the pipe, m / s;

[0065] A – Cross-sectional area of ​​the pipe, m 2 .

[0066] In a power system, electrical power represents the rate of change of electrical energy per unit time in a circuit, and can be used to describe the transmission, conversion, and consumption of electrical energy in the circuit. To characterize the flow and conversion of energy within a gas pipeline, the calorific value H of the gas is introduced. gCalorific value refers to the heat released by the complete combustion of a unit mass of fuel. The calorific value of natural gas is an important indicator of its energy content and the basis for calculating gas prices. In the electrical-thermal heterogeneous energy flow conversion process of an integrated energy system, the calorific value parameter must be considered when analyzing the conversion of natural gas. Therefore, gas power P is defined as... g for:

[0067] P g =H g G (8)

[0068] In the formula H g — The calorific value of fuel gases such as hydrogen and natural gas, in J / kg.

[0069] Power ratio P g The unit is J / s, which is consistent with the unit of electrical power. This establishes the unit of gas power P. g With electrical power P e The equivalent relationship between them is that both represent the power of energy.

[0070] Finally, the current analogue I in the gas system is derived. g The expression for the power loss of gas flowing through a pipe segment between any two adjacent nodes in a gas network. Pressure loss p loss =ΔρRT. Therefore, the current analogue I between two nodes in the gas network can be obtained. g The expression is:

[0071]

[0072] Combining the expression for the volumetric flow rate of gas, Q = vA, the current analogue I can be obtained. g for:

[0073]

[0074] In the formula, Q represents the volumetric flow rate of the gas, in meters. 3 / s.

[0075] Current analogy I g Defined as gas energy flow, with units of m. 3 / s, which is the same unit as the volumetric flow rate of gas.

[0076] At any node in a gas pipeline network, the flow rate flowing into the node equals the flow rate flowing out of the node. This characteristic can be expressed by the node flow balance formula:

[0077] B g Q p -Q n =0 (11)

[0078] In the formula B g—The node-pipeline segment correlation matrix of the gas network;

[0079] Q p — Pipe flow vector, m 3 / s;

[0080] Q n —The load flow vector of a node, m 3 / s.

[0081] The temperature T change of the gas before and after the node is negligible. Therefore, by combining equations (10) and (11), the gas-energy flow balance formula at the node can be obtained:

[0082]

[0083] In the formula —Pipe gas flow vector, m 3 / s;

[0084] —The load airflow vector of the node, m 3 / s.

[0085] In power systems, Kirchhoff's Current Law is the fundamental law of current in circuits. It states that at any node in a circuit, at any given moment, the sum of the currents flowing into the node equals the sum of the currents flowing out of the node. Expressed as an equation, for any node in the circuit:

[0086]

[0087] In the formula i k —The current flowing into or out of the kth node.

[0088] The two parameters I mentioned above g and i k They are physically similar, thus verifying the gas energy flow I. g (m 3 / s) as current I e The rationality of the (C / s) analogy.

[0089] According to the established gas-electric equivalence rule, the gas power P g It can be represented as:

[0090]

[0091] In the formula, W g p1 represents gas energy, which is the energy that can be generated by the complete combustion of gas transmitted through pipelines or consumed by equipment within a time period t. p1 and p2 represent the gas pressure at two nodes in the gas path.

[0092] In a power system, electrical power P e It can be represented as:

[0093]

[0094] In the formula, W e This represents the electrical energy transmitted, converted, and consumed by the power system within the time period t. and This represents the voltage between two nodes in a circuit.

[0095] Equations (14) and (15) reflect the gas power P g (J / s) and electric power P e Between (J / s) and gas energy W g (J) and electrical energy W e The equivalent correspondence between (J) and (J).

[0096] In summary, based on the similarity of the fundamental characteristics of gas systems and power systems, a new equivalent correspondence between the basic states, power, and energy parameters of gas and electricity was established. Table 1 presents the equivalent rules for the basic parameters of the gas network in the power system.

[0097] Table 1 Power System Equivalent Rules for Basic Gas Network Parameters

[0098]

[0099] Example 1

[0100] This embodiment discloses an equivalent circuit modeling method and system for a gas-electric coupled integrated energy system, including:

[0101] A new gas-electric equivalence rule is established, which is an equivalent correspondence between the basic states, power and energy parameters of gas and electricity based on the similarity of the basic characteristics of gas systems and electric systems.

[0102] Based on this equivalence rule, an equivalent circuit model is established in the gas system. The equivalent circuit model includes an equivalent model of the gas pipeline, an equivalent model of the compressor, an equivalent model of the gas load, an equivalent model of the combined heat and power unit, and an equivalent model of the gas storage device.

[0103] The process of establishing the equivalent model of the gas pipeline is as follows:

[0104] like Figure 2 As shown, the equivalent circuit model of the gas pipeline includes a first equivalent gas resistance representing the frictional effect of the pipeline on the gas flow and an equivalent gas sensation representing the transmission delay phenomenon of the gas in the pipeline.

[0105] The first equivalent gas resistance model is obtained based on the gas pipeline pressure drop formula and the gas-electric equivalence rule. The gas pipeline pressure drop formula is as follows:

[0106] In the formula, Δp is the pressure drop of the compressible gas, p in p is the pressure at the starting point of the pipe section. out Let ρ be the pressure at the end of the pipe section, λ be the friction coefficient of the pipe, G be the mass flow rate of the gas, and ρ be the pressure at the end of the pipe section. in d is the gas density at the starting point of the pipe section, and d is the inner diameter of the pipe.

[0107] The pressure drop Δp in the gas pipeline formula is equivalent to U using the gas-electric equivalence rules in Table 1. g Combined with the gas energy flow I in the equivalent rule g Equivalent formula, U g and I g Substitute into the resistance formula In the middle, the equivalent air resistance can be obtained.

[0108] First equivalent air resistance for:

[0109] Inductive elements can reflect the inertial effect of energy, such as inductor L. e Since it impedes changes in current, the gas transport delay can be represented by an inductance L. e The corresponding equivalent air sensation L g Description: In an RL circuit, the time constant τ e From inductor L e and its parallel resistor R e The decision is:

[0110]

[0111] In establishing equivalent gaseous L g At the same time, it was also designed with L g Parallel virtual resistance The equivalent gas inductance is obtained based on the time constant of gas transmission in the pipeline and the virtual resistance. In the RL circuit, the inductor current changes at five times the time constant τ when the external excitation changes. e After reaching a steady state, the time constant τ of gas transmission in the pipeline is... g for:

[0112]

[0113] In the formula, t delay The gas transport delay time; the virtual resistance It has no actual physical meaning and its value is large enough.

[0114] Therefore, the equivalent gas sensation L g It can be established as:

[0115]

[0116] The equivalent circuit model of gas pipelines describes the gas loss and transmission delay phenomena during the pipeline transportation of gas, which are two important characteristics of gas systems. All parameters in the gas pipeline pressure drop formula are parameters at the starting point, avoiding iterative or trial-and-error solutions, and have good universality for pressure drop range and pipeline specifications.

[0117] The process of establishing the equivalent model of the compressor is as follows:

[0118] like Figure 3 As shown, the equivalent pressure source Second equivalent air resistance Connect the circuits in series to establish an equivalent circuit model of the compressor.

[0119] The equivalent pressure source is the pressure increment provided by the compressor, and the model is as follows:

[0120]

[0121] In the formula, p com The pressure increment provided to the compressor, p m p n The air pressure on both sides of the compressor;

[0122] The second equivalent air resistance model is obtained based on the equivalent air pressure source model and the compressor pipeline flow model, wherein the compressor pipeline flow model is as follows:

[0123]

[0124] In the formula, f mn M is the flow rate through the branch mn where the compressor is located; k,i The horsepower consumed by compressor i; B k T is the compressor constant; k Z represents the compressor inlet temperature; α represents the compressor's specific heat ratio; Z represents the compressor's specific heat ratio. k,i η is the gas compressibility coefficient at the inlet of compressor i; k This is the efficiency coefficient of the compressor;

[0125] According to Table 1 above, the equivalent pressure source model can be converted into a pressure model. The compressor pipeline flow model can be converted into a gas energy flow model. As can be seen from Table 1 Substitute into the resistance formula Second equivalent air resistance is obtained

[0126] Second equivalent air resistance The model is:

[0127]

[0128] This paper provides a comprehensive description of the key characteristics of compressors in gas systems, reducing the complexity of joint analysis between the power grid and the gas grid.

[0129] The process of establishing the gas load equivalent model is as follows:

[0130] like Figure 4 As shown, the air load equivalent model uses the third equivalent air resistance. Establishment, based on Table 1 and the resistance formula. The third equivalent air resistance was obtained

[0131] Third equivalent air resistance The model is:

[0132] In the formula, p load,in p represents the gas pressure at the load inlet side. load,out Q represents the gas pressure at the load outlet side; load The volumetric flow rate of gas consumed by the user;

[0133] The process of establishing the equivalent model of a combined heat and power unit is as follows:

[0134] like Figure 5 As shown, voltage source and An equivalent model of a combined heat and power unit is established by connecting a controlled airflow source and a fourth equivalent air resistance in series. for Figure 5 The resistance in the figure represents the resistance of the power system portion at the output end of the cogeneration unit in the gas-electric coupling system. It is determined by the output voltage and current of the cogeneration unit and has no actual physical meaning; it is only used to illustrate the relationship between the output voltage and current.

[0135] Combined heat and power (CHP) units are one of the coupling units in an electricity-gas-heat multi-energy system and are an important component of an integrated energy system. The main inputs of CHP units are fuel gases such as hydrogen and natural gas, which can provide electricity to users and generate heat energy to supply the heat load in the area.

[0136] The relationship between heat production and electricity production in a combined heat and power (CHP) unit is as follows:

[0137]

[0138] In the formula, c m For the heat-to-power ratio of a combined heat and power (CHP) unit; φ CHP This refers to the net output heat power of the combined heat and power unit; This refers to the net output power of the combined heat and power unit;

[0139] Using a controlled current source, the coupling characteristics between the gas equivalent parameters and the electrical parameters are as follows:

[0140]

[0141] In the formula, and The equivalent parameters of the gas at the input end of the combined heat and power unit; and These represent the voltage and current output by the combined heat and power (CHP) unit, respectively; they can describe the key input-output coupling characteristics of the CHP unit in an integrated energy system.

[0142] The process of establishing the equivalent model of the gas storage device is as follows:

[0143] like Figure 6 As shown, using the equivalent gas capacity element C g An equivalent model of the gas storage device was established in series.

[0144] The traditional model of a gas storage device is:

[0145] E gs,t =E gs,t-1 +(Q gs,in -Q gs,out )Δt

[0146] In the formula E gs —Gas storage capacity of the gas storage device; Q gs,in Q gs,out — The flow rate of gas injected and released by the gas storage device within the time period t.

[0147] In this embodiment, the equivalent gas capacity element C is used. g Establish an equivalent circuit model of the gas storage device, with gas capacity C. g With capacitor C in the circuit e Similarly, it is used to indicate the storage or release of energy.

[0148] In the circuit, capacitor C e The calculation formula is:

[0149]

[0150] In the formula Q e —The amount of charge carried by the capacitor; U e —Voltage between the two plates of a capacitor; i e —The charging current of the capacitor.

[0151] Based on the capacitor C in the reference circuit e The equivalent gas capacitor element C is obtained by following the gas-electric equivalence rule. g Equivalent gas capacity element C g for:

[0152] In the formula, p gs—Gas pressure value inside the gas storage device; H g — Calorific value of the gas; A — Cross-sectional area of ​​the pipe at the input end of the gas storage device; v — One-dimensional flow velocity of the gas at the input end of the gas storage device; R — Gas constant of the gas; T — Gas temperature.

[0153] Equivalent models of gas storage devices can describe the key characteristics of gas storage devices in integrated energy systems, reducing the complexity of system analysis and calculation.

[0154] Example 2

[0155] The purpose of this embodiment is to provide an equivalent circuit modeling system for a gas-electric coupled integrated energy system.

[0156] An equivalent circuit modeling system for a gas-electric coupled integrated energy system includes:

[0157] The equivalent circuit model establishment module for gas pipelines is configured to: establish an equivalent circuit model of the gas pipeline based on the gas-electric equivalence rule. The equivalent circuit model of the gas pipeline includes a first equivalent gas resistance and an equivalent gas induction. The first equivalent gas resistance is obtained according to the gas pipeline pressure drop formula and the gas-electric equivalence rule. The equivalent gas induction is obtained according to the time constant of gas transmission in the pipeline and the virtual resistance.

[0158] The compressor equivalent model establishment module is configured to: establish a compressor equivalent model based on the gas-electric equivalent rule. The compressor equivalent model includes an equivalent gas pressure source and a second equivalent gas resistance. The equivalent gas pressure source is the gas pressure increment provided by the compressor. The second equivalent gas resistance is obtained based on the equivalent gas pressure source and the compressor pipeline flow rate.

[0159] The gas load equivalent model establishment module is configured to: establish a gas load equivalent model based on the gas-electric equivalent rule, and the gas load equivalent model is established through the third equivalent gas resistance.

[0160] The equivalent model establishment module for combined heat and power (CHP) units is configured to: establish an equivalent model of the CHP unit based on the gas-electric equivalence rule. The equivalent model of the CHP unit includes a voltage source, a controlled airflow source, a fourth equivalent air resistance, and... The voltage source is the voltage output of the combined heat and power (CHP) unit. The equivalent model of the CHP unit consists of the voltage source and... It consists of a series connection with a controlled airflow source and a fourth equivalent air resistance.

[0161] The equivalent model establishment module for the gas storage device is configured to: establish an equivalent model of the gas storage device based on the gas-electric equivalence rule. The equivalent model of the gas storage device includes equivalent gas capacity elements, wherein the equivalent gas capacity elements are obtained according to the capacitance and gas-electric equivalence rules.

[0162] Example 3:

[0163] Embodiment 3 of the present invention provides a computer-readable storage medium storing a program thereon, which, when executed by a processor, implements the steps in the above-described gas-electric coupled integrated energy system equivalent circuit modeling method.

[0164] Example 4:

[0165] Embodiment 4 of the present invention provides an electronic device, including a memory, a processor, and a program stored in the memory and executable on the processor, characterized in that the processor executes the program to implement the steps in the above-described gas-electric coupled integrated energy system equivalent circuit modeling method.

[0166] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A method for modeling the equivalent circuit of a gas-electric coupled integrated energy system, characterized in that, Establish gas-electric equivalence rules, which are equivalent correspondences between gas and electricity in terms of state, power and energy parameters established based on the similarity of characteristics of gas systems and electric systems. Based on this equivalence rule, equivalent circuit models of typical components in a gas system are established. The equivalent circuit models include equivalent models of gas pipelines, compressors, gas loads, combined heat and power units, and gas storage devices. Among them, based on the gas-electric equivalence rule, an equivalent circuit model of the gas transmission pipeline is established, and the equivalent circuit model of the gas transmission pipeline includes a first equivalent gas resistance and an equivalent gas induction. The first equivalent gas resistance model is obtained based on the gas pipeline pressure drop formula and the gas-electric equivalence rule. An equivalent gas sensing model is obtained based on the time constant of gas transmission in the pipeline and the virtual resistance. The equivalent circuit model of the gas pipeline is composed of an equivalent gas inductance and a first equivalent gas resistance connected in series, and then connected in parallel with a virtual resistor. Based on the gas-electric equivalence rule, an equivalent model of the compressor is established. The equivalent model of the compressor includes an equivalent gas pressure source and a second equivalent gas resistance. The equivalent gas pressure source is the gas pressure increment provided by the compressor. The second equivalent gas resistance model is obtained according to the equivalent gas pressure source model and the compressor pipeline flow model. The equivalent circuit model of the compressor consists of an equivalent pressure source and a second equivalent air resistance connected in series. Based on the gas-electric equivalence rule, an equivalent model of a combined heat and power (CHP) unit is established. This CHP unit equivalent model includes a voltage source, a controlled airflow source, a fourth equivalent air resistance, and... ; The equivalent model of the combined heat and power unit consists of a voltage source and It consists of a series connection with a controlled airflow source and a fourth equivalent air resistance.

2. The equivalent circuit modeling method for a gas-electric coupled integrated energy system as described in claim 1, characterized in that, The gas load equivalent model is established through the third equivalent gas resistance.

3. The equivalent circuit modeling method for a gas-electric coupled integrated energy system as described in claim 1, characterized in that, Based on the gas-electric equivalence rule, an equivalent model of the gas storage device is established; the equivalent model of the gas storage device includes an equivalent gas capacity element.

4. A modeling system for the equivalent circuit of a gas-electric coupled integrated energy system, characterized in that, include: The equivalent circuit model establishment module for gas pipelines is configured to: establish an equivalent circuit model of the gas pipeline based on the gas-electric equivalence rule. The equivalent circuit model of the gas pipeline includes a first equivalent gas resistance and an equivalent gas induction. The first equivalent gas resistance is obtained according to the gas pipeline pressure drop formula and the gas-electric equivalence rule. The equivalent gas induction is obtained according to the time constant of gas transmission in the pipeline and the virtual resistance. The equivalent circuit model of the gas pipeline is composed of an equivalent gas inductance and a first equivalent gas resistance connected in series, and then connected in parallel with a virtual resistor. The compressor equivalent model establishment module is configured to: establish a compressor equivalent model based on the gas-electric equivalent rule. The compressor equivalent model includes an equivalent gas pressure source and a second equivalent gas resistance. The equivalent gas pressure source is the gas pressure increment provided by the compressor. The second equivalent gas resistance is obtained based on the equivalent gas pressure source and the compressor pipeline flow rate. The gas load equivalent model establishment module is configured to: establish a gas load equivalent model based on the gas-electric equivalent rule, and the gas load equivalent model is established through the third equivalent gas resistance; The equivalent model establishment module for combined heat and power (CHP) units is configured to: establish an equivalent model of the CHP unit based on the gas-electric equivalence rule. The equivalent model of the CHP unit includes a voltage source, a controlled airflow source, a fourth equivalent air resistance, and... The voltage source is the voltage output by the combined heat and power (CHP) unit. The equivalent model of the CHP unit consists of the voltage source and... It consists of a series connection with a controlled airflow source and a fourth equivalent air resistance; The equivalent model establishment module for the gas storage device is configured to: establish an equivalent model of the gas storage device based on the gas-electric equivalence rule. The equivalent model of the gas storage device includes equivalent gas capacity elements, wherein the equivalent gas capacity elements are obtained according to the capacitance and gas-electric equivalence rules.

5. A computer-readable storage medium having a program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps in the equivalent circuit modeling method for gas-electric coupled integrated energy systems as described in any one of claims 1-3.

6. An electronic device comprising a memory, a processor, and a program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps in the equivalent circuit modeling method for a gas-electric coupled integrated energy system as described in any one of claims 1-3.

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