Multi-energy inertia support method considering fault point location

Abstract

The application discloses a kind of multi-energy inertia support methods for considering fault point position in the field of comprehensive energy technology, comprising the following steps: establishing multi-energy inertia unified output model;Establish multi-energy inertia support model according to natural gas network constraint;Considering the position of fault point, comprehensive gas inertia output, heat inertia output and demand side output, based on the multi-energy inertia support model established.The application clarifies the support effect of the heat inertia characteristics of heat supply system and the gas inertia characteristics of natural gas system on power failure, while fully considering the influence of different fault point positions in natural gas pipe network on gas inertia output, so as to evaluate the influence of fault point position on the response capability of comprehensive energy system after failure.The evaluation of the response capability of comprehensive energy system after failure can further optimize the existing multi-energy inertia support method, provide a new idea for formulating output scheme for subsequent failure of comprehensive energy system, and ensure the reliable operation of the system.

Description

Technical Field

[0001] This invention belongs to the field of integrated energy technology, specifically relating to a multi-energy inertial support method that takes into account the location of the fault point. Background Technology

[0002] With the increasing development of renewable energy, the uncertainty of power system output has significantly reduced the reliability of power grid operation. To ensure a continuous and reliable power supply, utilizing the gas-thermal inertia resources of an integrated energy system that couples electricity, gas, and heat has become a current trend. Compared to the hourly power support of thermal inertia, the timescale of gas inertia power support is only on the minute level. Therefore, the output of local gas inertia in the natural gas network will have a more significant impact on the overall pipeline network, thus affecting the natural gas system's ability to respond to subsequent faults. Therefore, fully considering the impact of different fault locations in the natural gas pipeline network on gas inertia output, and thus assessing the impact of fault location on the integrated energy system's post-fault response capability, is of great significance. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the purpose of this invention is to provide a multi-energy inertial support method that takes into account the location of the fault point, so as to solve the problems mentioned in the background art.

[0004] The objective of this invention can be achieved through the following technical solutions:

[0005] A multi-energy inertial support method that takes into account the location of the fault point includes the following steps:

[0006] Modeling the inertial characteristics of the thermal system and the natural gas system is carried out. Based on the multi-energy inertial unified output mode of gas thermal inertia, and the established thermal inertial characteristic response model of the thermal system and the gas inertial characteristic response model of the natural gas system, a multi-energy inertial unified output model is established.

[0007] A comprehensive energy hub model based on the natural gas network is established. Then, based on the established comprehensive energy hub model, a multi-energy inertial support model constrained by the natural gas network is established.

[0008] Considering the location of the fault point, and integrating the gas inertial output, thermal inertial output, and demand-side output, based on the established multi-energy inertial support model, a power support model is established for different fault points with the optimization objective of minimizing the total cost of multi-energy inertial support. Based on the power support model, a method is proposed to evaluate the impact of the fault point location on the post-fault response capability of the integrated energy system.

[0009] Preferably, the thermal inertia of the thermal system in step 1 includes two characteristics, and the first characteristic model is as follows:

[0010] Ph,out (t0+t h,delay ) = P h,in (t0)+ΔP h,in

[0011] P h,out (t0+t delay ) is after t h,delay The delay is caused by the heat power output from the heat pipe, and the transmission delay t delay The length of the hot water pipe l p and hot water flow rate v p Decide:

[0012]

[0013] The second feature model is as follows:

[0014] P h,out (t0+t h,delay ) < P h,in (t0)+ΔP h,in .

[0015] Preferably, the gas inertia of the natural gas system in step 1 includes two characteristics, the first characteristic model being as follows:

[0016] P g,out (t0+t g,delay ) = P g,in (t0)+ΔP g,in

[0017] The second feature model is as follows:

[0018] P g,out (t0+t g,delay ) < P g,in (t0)+ΔP g,in .

[0019] Preferably, the multi-energy inertial unified output model established in step 1 is as follows:

[0020] .

[0021] Preferably, in step 2, the energy hub model of the natural gas network is as follows:

[0022] .

[0023] Preferably, in step 2, the multi-energy inertial support model constrained by the natural gas network includes electrical power balance constraints and thermal power balance constraints. The electrical power balance constraints are as follows:

[0024]

[0025] The thermal power balance constraint is expressed as:

[0026] .

[0027] Preferably, the multi-energy inertial support model established in step 3 is as follows:

[0028] minCost = C RG +C RH +C COM .

[0029] Preferably, the aero-inertial output cost of the multi-energy inertial support model in step 3 is as follows:

[0030]

[0031] The thermal inertial output cost of the multi-energy inertial support model is as follows:

[0032]

[0033] The demand-side output cost of the multi-energy inertial support model is as follows:

[0034] .

[0035] The beneficial effects of this invention are:

[0036] 1. This invention clarifies the supporting role of thermal inertia characteristics of thermal systems and gas inertia characteristics of natural gas systems in power failures. It also fully considers the impact of different fault locations in the natural gas pipeline network on gas inertia output, thereby assessing the impact of fault location on the response capability of integrated energy systems after a fault. The assessment of the response capability of integrated energy systems after a fault can further optimize existing multi-energy inertia support methods, providing a new approach for integrated energy systems to formulate output plans to cope with subsequent faults, and ensuring the reliable operation of the system. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a flowchart of the method of the present invention;

[0039] Figure 2 This is a diagram illustrating the gas-thermal inertial characteristics of this invention;

[0040] Figure 3 This is a model diagram of the energy hub of the integrated energy system in this invention;

[0041] Figure 4 This is a schematic diagram of an 8-node network in this invention;

[0042] Figure 5 is A diagram showing the natural gas network changes when the fault location is in load group L1 in this invention.

[0043] Figure 6 This is a diagram showing the changes in the natural gas network when the fault location is in load group L2 in this invention;

[0044] Figure 7 In this invention, the fault location is in load group L. 3. A diagram showing the changes in the natural gas network over time. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] Please see Figure 1 As shown, this invention proposes a multi-energy inertial support method that takes into account the location of the fault point, including the following steps:

[0047] Step 1: Model the inertial characteristics of the thermal system and the natural gas system:

[0048] Step 1 specifically includes the following steps:

[0049] Step 1.1: Establish a thermal inertial characteristic response model for the thermodynamic system:

[0050] In a thermal system, due to the long length of hot water transmission pipes, power fluctuations generated at the heat source will experience a certain delay before reaching the load side. This characteristic is the first feature of the thermal inertia of a thermal system, and the model for feature one is as follows:

[0051] P h,out (t0+t h,delay ) = P h,in (t0)+ΔP h,in

[0052] In the formula, P h,in Let ΔP be the power supplied by the heat source to the heat pipe at time t0. h,in P represents the power fluctuation generated at the heat source at time t0. h,out (t0+t delay ) is after t h,delay The delay is due to the heat power output from the heat pipe; where the transmission delay t delayThe length of the hot water pipe l p and hot water flow rate v p Decide:

[0053]

[0054] During hot water transmission, heat loss occurs due to the long transmission time. Simultaneously, the thermal building on the load side also exhibits heat dissipation characteristics. Therefore, power fluctuations at the heat source are reduced by the time they reach the load side. Based on the first characteristic model, considering the second characteristic of the thermal system's thermal inertia, the model is as follows:

[0055] P h,out (t0+t h,delay ) < P h,in (t0)+ΔP h,in

[0056] In the formula, at t0+t h,delay The power output of the heating network at time t0 must be less than the sum of the power input to the heating network at time t0 and the power fluctuation.

[0057] Step 1.2: Establish a gas inertial characteristic response model for the natural gas system.

[0058] In natural gas systems, the gas source is typically located far from the gas load, resulting in a long response time to changes in demand. This characteristic is the first feature of the gas inertia of natural gas systems, and the model for this feature is as follows:

[0059] P g,out (t0+t g,delay ) = P g,in (t0)+ΔP g,in

[0060] In the formula, P g,in Let ΔP be the power supplied by the gas source to the load at time t0. g,in P represents the power fluctuation generated at the load at time t0. g,out (t0+t h,delay ) is after t delay The delay is caused by the power supplied to the load by the gas source.

[0061] During natural gas transmission, a difference in gas flow exists between the beginning and end of a natural gas pipeline. This flow difference causes some natural gas to remain in the pipeline during transmission, a phenomenon known as pipeline storage. When the flow at the load end suddenly increases, the pipeline storage can be quickly released to meet load demand; when the flow at the load end suddenly decreases, excess natural gas will be temporarily stored. Therefore, pipeline storage has the ability to smooth out power fluctuations on the load side. This characteristic is the second feature of the gas inertia of the natural gas system. Based on the model of feature one, the second feature of the gas inertia of the natural gas system is considered, and the model is as follows:

[0062] Pg,out (t0+t g,delay ) < P g,in (t0)+ΔP g,in

[0063] In the formula, at t0+t g,delay The power supplied to the load by the gas source at any given time must be less than the sum of the actual power demanded by the load at time t0 and the load demand fluctuation.

[0064] Step 1.3: Considering the gas thermal inertia, a multi-energy inertial unified output model is established based on the thermal inertia characteristic response model of the thermodynamic system established in Step 1.1 and the gas inertia characteristic response model of the natural gas system established in Step 1.2.

[0065] Both thermal inertia and gas inertia have similar abilities to mitigate power fluctuations and delay the onset of their effects on the system. Similar characteristics of thermal and gas inertia include... Figure 2 As shown, for thermal inertia, its power support characteristics are mainly reflected in the indoor temperature on the load side, such as... Figure 2 As shown, the heat input at time t1 changes from the normal value Immediately become The indoor temperature also followed suit from the normal value Decrease to a negative exponent The change in indoor temperature is slower than the instantaneous change in heat input, which delays the arrival of the desired indoor temperature. This reduces the time spent sacrificing user-side comfort. Assume the total time Δt for the reduction in thermal input... total for:

[0066] Δt total =t2-t1

[0067] In the formula, t1 / t2 are the start / end times of the heat input reduction, and the delay time Δt provided by thermal inertia is... delay for:

[0068] Δt delay =Δt total -Δt1

[0069] In the formula, Δt1 represents the indoor temperature maintained at... The time.

[0070] For gas inertia, its power support characteristics are mainly reflected in the change of pressure at the end of the pipeline. When the natural gas flow rate at time t1 changes from the normal value f out,1 Suddenly rises to f out,2 Pipeline reserves are released to supply the suddenly increased load demand, and the pressure at the end of the pipeline drops exponentially from the normal value P. out,1 Drop to P out,2Similarly, compared to the instantaneous change in gas flow rate, the change in pipeline pressure is relatively slow, which delays the pipeline pressure from reaching P. out,2 This reduces the time required for emergency compressed gas storage in pipelines and minimizes the impact on pipeline network operation. Based on the similar response form of gas thermal inertia to power fluctuations, a multi-energy inertial output model is established as follows:

[0071]

[0072] In the formula, α and β are the constants of thermal inertia and gas inertia, respectively, for mitigating power fluctuations, and 0 < α, β < 1. α and β characterize the ability of multi-energy inertia to mitigate power fluctuations. h,delay and t g,delay The delay capability of multi-energy inertial systems in responding to power fluctuations is characterized. The ability of multi-energy inertial systems to smooth out power fluctuations and the delay capability together constitute the multi-energy inertial support model.

[0073] Step 2: Establish a multi-energy inertial support model considering the network constraints of the natural gas system:

[0074] Step 2 specifically includes the following steps:

[0075] Step 2.1: Establish a comprehensive energy hub model considering the natural gas network:

[0076] Integrated energy system energy hub model, such as Figure 3 As shown, the components include an external power grid, gas source, transformer, electric boiler, combined heat and power (CHP) unit, electrical load, and heat load; considering the natural gas network as an eight-node network, such as... Figure 4 As shown, the network contains two gas sources and three load groups connected to different nodes in the network. Each load group corresponds to one CHP unit. Each load group contains both heat and electricity loads. The electricity load of each load group is supplied by the external power grid, transformers, and the CHP unit at its location. The heat load of each load group is supplied by electric boilers and the CHP unit at its location. Therefore, the energy hub model of the natural gas network is expressed as follows:

[0077]

[0078] In the formula, For load group L n Electrical load / heat load at the location (n=1,2,3), η is the energy distribution coefficient. T / η EB The power conversion coefficient of the transformer / electric boiler. For load group L n Gas-to-electricity conversion coefficient / gas-to-heat conversion coefficient of the CHP unit (n=1,2,3) For external air source 1 and external air source 2, P ES It supplies power to the external power grid.

[0079] Step 2.2: Based on the integrated energy hub model considering the natural gas network established in Step 2.1, establish a multi-energy inertial support model considering the constraints of the natural gas network:

[0080] When considering natural gas network constraints, the nodal flow constraints for natural gas are similar to those for electricity, following the principle that the total inflow at a node equals the total outflow. Changes in natural gas flow at loads are consistent with changes in load; the natural gas flow at a load only changes when load demand changes. For example, when a fault occurs at load group 1, the natural gas flow at load group 2... Natural gas flow at 3 locations in the load group If the flow rate at the natural gas node remains constant, the variation in the multi-energy inertial support model is expressed as follows:

[0081]

[0082] When the fault occurs at load group 2, the natural gas flow rate at load group 1 Natural gas flow at 3 locations in the load group The flow rate at the end of pipe 34 remains unchanged. With the natural gas flow rate at the two load groups The change in natural gas node flow rate in the multi-energy inertial support model is expressed as follows:

[0083]

[0084] When the fault occurs at load group 3, the natural gas flow rate at load group 1... Natural gas flow at two locations in the load group The flow rate at the end of pipe 67 remains unchanged. With the natural gas flow at 3 locations in the load group The change in natural gas node flow rate in the multi-energy inertial support model is expressed as follows:

[0085]

[0086] In the formula, The fault occurred in load group L at time t / t0. n Load group L at time m The flow rate at point (m, n = 1, 2, 3); Let be the flow rate at the end of pipe ab.

[0087] When a power grid fault causes a power deficit, multi-energy inertia primarily responds in two ways. The first response involves diverting the thermal power originally supplied to the electric boiler to the transformer side to increase load-side power, thus transferring the fault's impact on the power system to the thermal system with thermal inertia. The second response involves increasing the gas valve of the CHP unit to release a large amount of gas stored in the pipeline, while simultaneously utilizing the CHP unit's rapid response capability to generate electricity, transferring the fault's impact on the power system to the natural gas system with gas inertia. Therefore, the power balance constraint in the multi-energy inertia support model is expressed as:

[0088]

[0089] In the formula, L n For the nth load group (1≤n≤3), Load group L at time t n The inertial force of the air at the location, For the gas-to-electric conversion efficiency of the CHP unit, η T e is the efficiency coefficient of the transformer. ele (t) represents the power deficit at time t. Load group L at time t K The inertia of the air at the location exerts force.

[0090] The thermal power balance constraint in the multi-energy inertial support model is expressed as:

[0091]

[0092] In the formula, Let L be the load group other than the faulty load group at time t. K Thermal power offset at that location η is the thermal power offset at the faulty load group. EB The electrothermal conversion efficiency coefficient of the electric boiler. For the gas-to-heat conversion efficiency of the CHP unit, the power deficit is supported by the gas inertia output of the CHP unit at the faulted load and the thermal inertia output of the three load groups. The thermal offset of the load at the faulted load is generated by the gas inertia output and thermal inertia output of the local CHP unit, while the thermal offset of the other load groups at the non-faulted loads is generated only by the local thermal inertia output.

[0093] Step 3: Considering the location of the fault point, and taking into account both gas and thermal inertial output and demand-side output, based on the multi-energy inertial support model established in Step 2 that considers the network constraints of the natural gas system, establish a power support model suitable for different fault points with the optimization objective of minimizing the total cost of multi-energy inertial support:

[0094] In a comprehensive energy system comprising transformers, electric boilers, and CHP units, considering the combined gas inertial output, thermal inertial output, and demand-side output, and aiming to minimize power support costs while ensuring system operational reliability, a multi-energy inertial support model is established as follows:

[0095] min Cost = C RG +C RH +C COM

[0096] In the formula, Cost / C RG / C RH / C COM These are respectively the total cost of inertial power support / cost of aero-inertial output / cost of thermal inertial output / cost of demand-side output.

[0097] The gas inertial output cost of the multi-energy inertial support model is as follows:

[0098]

[0099] In the formula, T is the duration of the fault, and t0 is the initial time of the fault occurrence. The fault occurred in load group L n The unit cost of gas storage in pipeline a(a+1) / pipeline (b+1)(b+2) at that time (a=1,2,3; b=4,5). The fault occurred in load group L n The unit cost of gas storage in pipeline 36 at that time; when the fault point is at load group L1, the unit price relationship of gas inertia output is: When the fault point is at load group L2, the unit price relationship of the gas inertial output is as follows: When the fault point is at load group L3, the unit price relationship of the gas inertial output is as follows: The unit price of gas inertial output is set based on the principle of prioritizing the use of gas inertial resources near the fault point. When there are insufficient gas inertial resources near the fault point, the more other gas inertial resources in the network are used, the higher the total cost of gas inertial output, and the greater the impact of the fault occurring at that location on the response capability of the integrated energy system after a fault.

[0100] The thermal inertial output cost model for the multi-energy inertial support model is as follows:

[0101]

[0102] In the formula, The fault occurred in load group L c The unit cost of thermal inertia output at time (c,n=1,2,3), The fault occurred in load group L n Load group L at timec The unit cost of demand-side output at level m (c, n = 1, 2, 3), Load group L at time t c The thermal inertia output power (c=1,2,3); when the fault point is at load group L1, the unit price relationship of thermal inertia output power is: When the fault point is at load group L2, the unit price relationship of thermal inertia output is: When the fault point is at load group L3, the unit price relationship of thermal inertia output is: The unit price of thermal inertia output is set based on the principle of prioritizing the use of thermal inertia resources near the fault point. When there are insufficient inertia resources near the fault point, the more thermal inertia resources are used from other load groups, the higher the total cost of thermal inertia output, and the greater the impact of the fault occurring at that location on the response capability of the integrated energy system after a fault.

[0103] The demand-side output cost model for the multi-energy inertial support model is as follows:

[0104]

[0105] In the formula, Load group L at time t c The thermal offset at level m (c = 1, 2, 3) is given. The demand-side output adopts tiered pricing, where M is the total number of tiers in the demand-side tiered pricing, and C is the total number of load groups in the microgrid (C = 3).

[0106] Therefore, in this multi-energy inertial support model considering the fault point, the unit price of output for different support forms is set based on the impact of inertial resource usage on the post-fault response capability of the integrated energy system. Thus, the minimum total cost of multi-energy inertial support obtained from the optimization model is an indicator for evaluating the subsequent fault response capability of the integrated energy system after a fault occurs in a certain load group: the higher the total cost of multi-energy inertial support, the greater the impact of the fault location on the post-fault response capability of the integrated energy system. Table 1 shows the output and cost of the integrated energy system when faults occur in load groups L1, L2, and L3, respectively. Figure 5 is Natural gas network change diagram when the fault location is in load group L1. Figure 6 This is a diagram showing the changes in the natural gas network when the fault location is in load group L2. Figure 7 This is a diagram showing the changes in the natural gas network when the fault location is in load group L3.

[0107] Figure 5 to Figure 7 This indicates that, in order to minimize the impact of multi-energy inertial output on the integrated energy natural gas network, gas inertial is always invoked most frequently at locations closest to the fault point. For Figure 5When the fault occurs in load group L1, the gas inertia output of pipes 12 and 23 is the highest, while the gas inertia output of pipes farther from the fault point is relatively lower. Figure 6 and Figure 7 Similarly, observing the total cost of multi-energy inertial support at different fault points in Table 1, it can be seen that the total support cost is highest when the fault point is located in load group L1, followed by load group L2, and lowest when the fault point is located in load group L3. This result indicates that in this example, the fault point location has the greatest impact on the post-fault response capability of the integrated energy system when it is in load group L1, and the impact is smallest when it is in load group L3. Analyzing the reason for this phenomenon, the impact of the fault point location on the post-fault response capability of the integrated energy system is minimal when it is in load group L3 because load group L3 is downstream of the entire natural gas network and will not further affect the downstream gas inertial output due to the decrease in node pressure caused by power shortage. 36 The gas flow direction is from node 3 to node 6, which to some extent limits PL 34 The inertial force of the air output, therefore, although PL 34 The gas flow is also connected to the end of the pipeline, but it is not the actual downstream load. Load group L1 is located in the middle and upper part of the entire network, and the use of its gas inertia output will greatly affect the operation of the downstream natural gas pipeline network. Therefore, when the fault point is in load group L1, it has the greatest impact on the response capability of the integrated energy system after a fault.

[0108] Table 1. Output and cost information for different failure points.

[0109]

[0110] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0111] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0112] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0113] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0114] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A multi-energy inertial support method considering the location of the fault point, characterized in that, Includes the following steps: Step 1: Establish and model the inertial characteristics of the thermal system and the natural gas system. Based on the multi-energy inertial unified output mode of gas thermal inertia, and the established thermal inertial characteristic response model of the thermal system and the gas inertial characteristic response model of the natural gas system, establish a multi-energy inertial unified output model. Step 2: Establish a comprehensive energy hub model based on the natural gas network, and then, based on the established comprehensive energy hub model, establish a multi-energy inertial support model constrained by the natural gas network: Step 3: Considering the location of the fault point, and taking into account the gas inertial output, thermal inertial output, and demand-side output, based on the multi-energy inertial support model established in Step 2, a power support model is established for different fault points with the goal of minimizing the total cost of multi-energy inertial support. Based on the power support model, a method is proposed to evaluate the impact of the fault point location on the post-fault response capability of the integrated energy system. The aero-inertial output cost of the multi-energy inertial support model in step 3 is as follows: In the formula, It refers to the duration of the fault. It is the initial moment when the fault occurs. The fault occurred in the load group In the pipeline Unit cost of gas tube storage ( =1, 2, 3; =4, 5), The fault occurred in the load group The unit cost of gas storage in pipeline 36 at that time; when the fault point is in the load group At that time, the unit price relationship of the gas inertia output force is as follows: ; When the fault point is in the load group At that time, the unit price relationship of the gas inertia output force is as follows: ; When the fault point is in the load group At that time, the unit price relationship of the gas inertia output force is as follows: The unit price of gas inertial output is set based on the principle of prioritizing the use of gas inertial resources near the fault point. When there are insufficient gas inertial resources near the fault point, the more other gas inertial resources in the network are used, the higher the total cost of gas inertial output, and the greater the impact of the fault occurring at that location on the response capability of the integrated energy system after a fault. The thermal inertial output cost of the multi-energy inertial support model is as follows: In the formula, The fault occurred in the load group Unit cost of thermal inertia output ( c , n =1, 2, 3), ( )yes Time-based load group Thermal inertia output power ( c =1, 2, 3); when the fault point is in the load group At that time, the unit price relationship of thermal inertia output force is as follows: ; When the fault point is in the load group At that time, the unit price relationship of thermal inertia output force is as follows: ; When the fault point is in the load group At that time, the unit price relationship of thermal inertia output force is as follows: The unit price of thermal inertia output is set based on the principle of prioritizing the use of thermal inertia resources near the fault point. When there are insufficient inertia resources near the fault point, the more thermal inertia resources are used from other load groups, the higher the total cost of thermal inertia output, and the greater the impact of the fault occurring at that location on the response capability of the integrated energy system after a fault. The demand-side output cost of the multi-energy inertial support model is as follows: In the formula, ( )yes Time-based load group In Thermal offset at horizontal level ( c =1, 2, 3), demand-side output adopts tiered pricing. M This represents the total number of price tiers on the demand side. C The total number of load groups in the microgrid ( C =3), The fault occurred in the load group Load group at time Demand-side efforts Unit cost at the level ( c , n =1, 2, 3).

2. The multi-energy inertial support method considering the location of the fault point according to claim 1, characterized in that, In step 1, the thermal inertia of the thermal system includes two characteristics, and the first characteristic model is as follows: In the formula, for The power of the heat source supplying the heat pipe at all times. for The power fluctuations that are constantly generated at the heat source For the process The delay is caused by the heat power output from the heat pipe, and the transmission delay. Due to the length of the hot water pipe and hot water flow rate Decide: The second feature model is as follows: In the formula, The power output of the heating network at all times must be less than The sum of the power input to the heating network at all times and the power fluctuations.

3. The multi-energy inertial support method considering the location of the fault point according to claim 1, characterized in that, The gas inertia of the natural gas system in step 1 includes two characteristics, the first characteristic model is as follows: In the formula, for The power of the gas source supplied to the load at any given time. for The power fluctuations that constantly occur at the load point For the process The delay is caused by the power supplied to the load by the gas source; The second feature model is as follows: In the formula, The power supplied to the load by the gas source at all times must be less than The sum of the actual power demand of the load at any given time and the fluctuation of the load demand.

4. The multi-energy inertial support method considering the location of the fault point according to claim 1, characterized in that, The multi-energy inertial unified output model established in step 1 is as follows: In the formula, and These are the constants for mitigating power fluctuations due to thermal inertia and gas inertia, respectively. and This characterizes the ability of multi-energy inertial systems to mitigate power fluctuations. and The delay capability of multi-energy inertial systems in responding to power fluctuations is characterized. The ability of multi-energy inertial systems to smooth out power fluctuations and the delay capability together constitute the multi-energy inertial support model.

5. A multi-energy inertial support method considering the location of the fault point according to claim 1, characterized in that, In step 2, the energy hub model of the natural gas network is as follows: In the formula, For load groups Electrical load / heat load at the location ( n =1, 2, 3). This is the power distribution factor. The power conversion coefficient of the transformer / electric boiler. For load groups Gas-to-electric conversion coefficient / gas-to-heat conversion coefficient of CHP unit ( n =1, 2, 3). External air source 1 and external air source 2, It supplies power to the external power grid.

6. The multi-energy inertial support method considering the location of the fault point according to claim 1, characterized in that, In step 2, the multi-energy inertial support model constrained by the natural gas network includes electrical power balance constraints and thermal power balance constraints. The electrical power balance constraints are as follows: In the formula, For the first individual load groups ( )for Time-based load group The inertial force of the air at the location, The gas-to-electricity conversion efficiency of the CHP unit. This is the efficiency coefficient of the transformer. for Power deficit at any given moment ( )for Time-based load group The inertial force of the air at the location; The thermal power balance constraint is expressed as: In the formula, ( )for Load groups other than faulty load groups at all times Thermal power offset at that location ( ) represents the thermal power offset at the faulty load group. The electrothermal conversion efficiency coefficient of the electric boiler. The gas-heat conversion efficiency of the CHP unit.

7. A multi-energy inertial support method considering the location of the fault point according to claim 1, characterized in that, The multi-energy inertial support model established in step 3 is as follows: In the formula, The total cost of inertial power support is respectively Air inertia output cost Demand-side output costs.

8. A multi-energy inertial support system that takes into account the location of the fault point, characterized in that, The system is used to implement the multi-energy inertial support method considering the location of the fault point as described in claim 1, and the system includes: The output module is used to establish a unified multi-energy inertial output model by using the thermal inertial characteristic response model of the thermal system and the gas inertial characteristic response model of the natural gas system. Hub module, used to build integrated energy hub model based on natural gas network; The inertial support module is used to establish a multi-energy inertial support model based on the established integrated energy hub model. The power support module is used to establish a power support model applicable to different fault points based on the established multi-energy inertial support model.

9. A multi-energy inertial support controller that takes into account the location of a fault point, storing a program for running the multi-energy inertial support system that takes into account the location of a fault point as described in claim 8.

Images