Method and device for calculating carbon emission liability of direct-current traction power supply system

Abstract

The present invention relates to the technical field of traction power supply, and in particular to a method and device for calculating the carbon emission liability of a direct-current traction power supply system. The method comprises: obtaining real-time electrical information of a plurality of traction substations in a direct-current traction power supply system and train position information, to establish a node position relationship of any line between any adjacent traction substations, and then using the real-time electrical information to obtain the power flow of each branch and the power flow of each node; on the basis of a preset power flow tracing algorithm, the power flow of each branch and the power flow of each node, carrying out power flow tracing to determine the carbon emission intensity of a power supply node; and on the basis of the carbon emission intensity of the power supply node, calculating the carbon emission liability transmitted on each branch and the carbon emission liability of each node, so as to obtain a carbon emission liability calculation result of the direct-current traction power supply system in real-time operation. Thus, the present invention solves the problems in existing carbon emission liability accounting of ignoring the characteristics of energy prosumers of trains, having difficulty in real-time power flow tracking, and the like.

Description

Carbon emission responsibility calculation method and device for DC traction power supply system

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application number "202310959143.4" filed by Tsinghua University on August 1, 2023, entitled "Method and device for calculating carbon emission responsibility of DC traction power supply system". Technical Field

[0003] The present invention relates to the field of traction power supply technology, and in particular to a method and device for calculating carbon emission responsibility of a direct current traction power supply system. Background Art

[0004] A DC traction power supply system uses a DC network to supply power to trains. With environmental degradation and the growing energy crisis, energy conservation and carbon reduction in DC traction power systems have become a key development direction. New carbon trading policies are gradually being implemented in some countries and regions. These policies are conducive to achieving carbon emission reductions. Common new carbon trading policies include carbon taxes and carbon quotas.

[0005] Under the new carbon trading policy, operators of DC traction power supply systems may need to pay higher fees based on their carbon emissions responsibilities, and may even need to purchase additional credits if their carbon emissions exceed their quotas. Therefore, calculating the carbon emissions liability of DC traction power supply systems during actual operation has become essential for these systems to effectively and rationally participate in the new carbon trading policy. Calculating the carbon emissions liability of DC traction power supply systems has become a key technical issue that urgently needs to be addressed in real-time operations.

[0006] Currently, there is no existing technology for calculating carbon emission responsibility for DC traction power supply systems. However, there are four main methods for calculating carbon emission responsibility for power systems:

[0007] A related technique is the average factor method, where electricity consumption * average factor = carbon emission responsibility. This method is simple, reliable, and easy to use, and is widely used to calculate carbon emission responsibility for electricity consumption. However, the average factor is difficult to determine, and data needs to be updated every few years. Furthermore, it is not reasonable to use the same factor for the same power grid across a large geographical area, and to share the same factor for renewable energy, thermal power, and hydropower. These factors also lead to inaccurate calculation results using the average factor method.

[0008] Related technology 2: Game theory method. Cooperative game theory can be used to calculate carbon emission responsibility, but the calculation process is complex, lacks clear physical meaning, involves complex management processes and competitive game behaviors, and this method has not yet been applied to engineering.

[0009] Related technology: the sensitivity method, which is only suitable for measuring the marginal carbon emission responsibility of load changes. Similarly, this method has not yet been applied to engineering projects;

[0010] Related Technology Four Carbon Emission Flow Method: The carbon emission flow is defined as a virtual network flow attached to the power flow. By adding a "carbon label" to each node or branch power flow, this method can calculate the carbon emission responsibility flow of each node or branch separately. In addition, the power flow tracking method evaluates how much of the power output of a specific energy producer flows to a specific energy consumer or a specific line. Taking into account the "carbon label" and power flow tracking results, the carbon emission flow method can track the transfer of carbon emission responsibility from each power generator to the consumer. Since this method can reasonably distribute carbon emission responsibilities among energy consumers, is easy to implement, and has intuitive physical meaning, it has been widely adopted in related research and has begun to be adopted in engineering projects. However, this method is mainly aimed at the real-time operation of ordinary power systems rather than traction power supply systems, and does not take into account the energy producer and consumer characteristics of the train. In addition, it is difficult to perform real-time power flow tracking, so it cannot be applied to the real-time power flow of the traction power supply system to calculate the real-time power flow of the train.

[0011] Summary of the Invention

[0012] The present invention provides a method and device for calculating the carbon emission responsibility of a DC traction power supply system, so as to solve the problems that, in the carbon emission responsibility accounting, the main load in the traction power supply system is the train, ignoring that the train is both an energy consumer that bears the carbon emission responsibility and an energy producer that transfers the carbon emission responsibility to other energy consumers; and the train moves rapidly along the track, and the number, topology and electrical parameters of the branches change rapidly, making it impossible to directly measure the power flow of the branch and difficult to solve the real-time power flow calculation to obtain the real-time branch power flow; and in the engineering project, only the transponder is used for the positioning of the train, and the real-time train position cannot be obtained, and it is difficult to determine the length and parameters of each branch, and thus it is impossible to solve the real-time power flow.

[0013] A first aspect of the present invention provides a method for calculating the carbon emission responsibility of a DC traction power supply system, comprising the following steps: obtaining real-time electrical information and real-time train position information of multiple traction stations in the DC traction power supply system; establishing a node position relationship for any line between any adjacent traction stations based on the real-time train position information, and obtaining the power flow of each branch and the power flow of each node based on the node position relationship and the real-time electrical information; based on a preset power flow tracking algorithm, performing real-time power flow tracking based on the power flow of each branch and the power flow of each node to determine the carbon emission intensity of the power supply node; calculating the carbon emission responsibility transmitted on the branch and the carbon emission responsibility of the node based on the carbon emission intensity of the power supply node to obtain a carbon emission responsibility calculation result of the DC traction power supply system for real-time operation.

[0014] Optionally, the real-time electrical information includes: the voltage of the DC side ports of multiple traction stations in the DC traction power supply system, the grid feeder current from the traction station to the traction network, the voltage information of all trains and the current information of all trains; the real-time train position information includes at least one of the position information of the section where all trains are located and the relative position relationship between all trains and the traction station.

[0015] Optionally, determining the carbon emission intensity of the power supply node includes: obtaining the actual type of the power supply node; when the actual type is an external power source, determining the carbon emission intensity of the power supply node through an external power grid; when the actual type is a new energy source, the carbon emission intensity of the power supply node is zero; when the actual type is a train that generates electricity through regenerative braking, establishing a train carbon emission flow model, and calculating the carbon emission intensity of the power supply node through the train carbon emission flow model.

[0016] Optionally, establishing a train carbon emission flow model and calculating the carbon emission intensity of the power node through the train carbon emission flow model includes: obtaining a first total inflow of electric energy and carbon emission flow of a target train within a preset time period, and a second total inflow of electric energy and carbon emission flow of the target train between two stations; using the first total inflow of electric energy and carbon emission flow and the second total inflow of electric energy and carbon emission flow to establish the train carbon emission flow model, wherein the calculation formula of the train carbon emission flow model is: E vi (t) = E vi (t-Δt)+P i (t)Δt E i (t) = E i (t-Δt)+P i (t)Δt F vi (t) = F vi (t-Δt)+ζ i (t)Δt F i (t) = F i (t-Δt)+ζ i (t)Δtζ i (t) = P i (t)·e i (t) e i (t) = F vi (t) / E vi (t)

[0017] Among them, t is the current time point, Δt is the time step for carbon emission responsibility calculation, E vi P is the total inflow of electric energy between the two stations of the preset train i, i is the power of the preset train i, E iis the total inflow electric energy accumulated by the preset train i in the preset time period, F vi is the total inflow carbon emission flow of the preset train i between two stations, ζ i The carbon emission responsibility of the preset train i, F i is the total inflow carbon emission flow accumulated by the preset train i in the preset time period, e i is the node carbon emission intensity of the preset train i.

[0018] The second aspect of the present invention provides a device for calculating the carbon emission responsibility of a DC traction power supply system, including: an acquisition module for acquiring real-time electrical information and real-time train position information of multiple traction stations in the DC traction power supply system; a construction module for establishing a node position relationship of any line between any adjacent traction stations based on the real-time train position information, and obtaining the power flow of each branch and the power flow of each node based on the node position relationship and the real-time electrical information; a determination module for performing real-time power flow tracking based on the power flow of each branch and the power flow of each node based on a preset power flow tracking algorithm to determine the carbon emission intensity of the power supply node; a calculation module for calculating the carbon emission responsibility transmitted on the branch and the carbon emission responsibility of the node based on the carbon emission intensity of the power supply node to obtain a carbon emission responsibility calculation result of the DC traction power supply system for real-time operation.

[0019] Optionally, the real-time electrical information includes: the voltage of the DC side ports of multiple traction stations in the DC traction power supply system, the grid feeder current from the traction station to the traction network, all train voltage information and all train current information, and the real-time train position information includes at least one of the position information of the train section and the relative position relationship between all trains and the traction station.

[0020] Optionally, the determination module includes: an acquisition unit for acquiring the actual type of the power supply node; a first determination unit for determining the carbon emission intensity of the power supply node through an external power grid when the actual type is an external power source; a second determination unit for determining that the carbon emission intensity of the power supply node is zero when the actual type is new energy; and a calculation unit for establishing a train carbon emission flow model when the actual type is a train that generates electricity through regenerative braking, and calculating the carbon emission intensity of the power supply node through the train carbon emission flow model.

[0021] Optionally, the calculation unit is specifically configured to: obtain a first total inflow of electric energy and carbon emission flow of a target train within a preset time period, and a second total inflow of electric energy and carbon emission flow of the target train between two stations; and establish a train carbon emission flow model using the first total inflow of electric energy and carbon emission flow and the second total inflow of electric energy and carbon emission flow, wherein the calculation formula of the train carbon emission flow model is: E vi (t) = E vi (t-Δt)+P i (t)Δt E i (t) = E i (t-Δt)+P i (t)Δt F vi (t) = F vi (t-Δt)+ζ i (t)Δt F i (t) = F i (t-Δt)+ζ i (t)Δtζ i (t) = P i (t)·e i (t) e i (t) = F vi (t) / E vi (t)

[0022] Among them, t is the current time point, Δt is the time step for carbon emission responsibility calculation, E vi P is the total inflow of electric energy between the two stations of the preset train i, i is the power of the preset train i, E i is the total inflow electric energy accumulated by the preset train i in the preset time period, F vi is the total inflow carbon emission flow of the preset train i between two stations, ζ i The carbon emission responsibility of the preset train i, F i is the total inflow carbon emission flow accumulated by the preset train i in the preset time period, e i is the node carbon emission intensity of the preset train i.

[0023] The method and device for calculating the carbon emission responsibility of a DC traction power supply system according to the embodiments of the present invention can realize reasonable and practical calculation of the system's carbon emission responsibility in real-time operation scenarios, and improve the power flow tracking method and establish a train carbon emission flow model based on the characteristics of the DC traction power supply system; participate in new carbon emission policies during the real-time operation of the DC traction power supply system, and evaluate the carbon emission responsibility of the DC traction power supply system in real time, providing indispensable technology and laying the foundation for related research on future DC traction power supply systems, including low-carbon planning, low-carbon operation and carbon trading; in addition, it provides important reference value for AC traction power supply systems in the field of rail transit electrification.

[0024] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0026] FIG1 is a flow chart of a method for calculating carbon emission responsibility of a DC traction power supply system according to an embodiment of the present invention;

[0027] FIG2 is a schematic diagram of the locations of electrical measuring points on the DC side according to an embodiment of the present invention;

[0028] FIG3 is a schematic diagram of a line between traction station m and traction station m+1 according to an embodiment of the present invention;

[0029] FIG4 is a block diagram illustrating an exemplary device for carbon emission responsibility of a DC traction power supply system for real-time operation according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0031] FIG1 is a schematic diagram of a flow chart of carbon emission responsibility calculation for a DC traction power supply system for real-time operation according to an embodiment of the present invention.

[0032] As shown in Figure 1, the DC traction power supply system carbon emission responsibility calculation method includes the following steps:

[0033] In step S101, real-time electrical information and real-time train position information of multiple traction substations in a DC traction power supply system are obtained.

[0034] Specifically, embodiments of the present invention require determining the system's network power and voltage information based on real-time measurement information. Conventional DC-side measurement points in engineering electrical measurement systems include: the voltage at the DC-side port of the traction station, the current in the feeder line from the traction station to the traction network, and the voltage and current information of the train. Therefore, as shown in Figure 2, embodiments of the present invention utilize the voltage and current at the measurement points in the figure as physical quantities that can be measured in real time. The real-time electrical information obtained specifically includes: the voltage at the DC-side ports of multiple traction stations in the DC traction power supply system, the current in the feeder line from the traction station to the traction network, and at least one of the voltage information and current information of all trains.

[0035] In addition to the electrical information measurement, the embodiment of the present invention also needs to consider the measurement of train position information. This type of measurement can be divided into two categories: one is to only obtain the section where the train is located, with a positioning accuracy of hundreds of meters, such as the transponder method; the other is to obtain the exact position of the train, with a positioning accuracy of meters, such as the gyroscope method. Considering that the accurate position of the train may not be obtained in the project, the branch resistance and inductance parameters cannot be accurately calculated, and it is difficult to perform real-time power flow calculations, the carbon emission responsibility calculation method proposed in the embodiment of the present invention does not require accurate train position measurement in the project, but only requires the relative position relationship between all trains and traction depots to be obtained. Therefore, the real-time train position information is collected by using a transponder, and the real-time train position information includes at least one of the position information of the section where all trains are located and the relative position relationship between all trains and traction depots.

[0036] In step S102, a node position relationship of any line between any adjacent traction depots is established based on real-time train position information, and the power flow of each branch and each node is obtained based on the node position relationship and real-time electrical information.

[0037] Specifically, based on the relative positional relationships between all trains and traction depots, the topological connection relationships can be clarified, enabling real-time power flow tracking of the DC traction power supply system. First, as shown in Figure 3, based on real-time train position information, a node position relationship is established for a line (either uplink or downlink) between two traction depots (traction depot m and traction depot m+1). The node position relationship is:

[0038] Assume that there are s trains in the preset section. The first train adjacent to the traction station m is numbered j. The train numbers increase in sequence towards the traction station m+1 until the train adjacent to the traction station m+1 is numbered j+s.

[0039] Set the branch number between traction station m and train j to k, and the branch numbers are incremented towards traction station m+1 until the branch number connected to traction station m+1 is k+s;

[0040] Use I sm Indicates the current of traction station m, with v vj I represents the current of train j. ck represents the current in branch k, then:

[0041] The current of each branch can be calculated, and since the voltage of each node can be directly measured, the power flow of each branch and node can be solved as follows:

[0042] The branch power can be calculated by calculating the branch current and measuring the node current. Suppose branch k connects nodes m and j, and the power from node m to j is P mj : P mj =I ck ·U m (2)

[0043] The power loss of this branch k is P mj,loss : P mj,loss =|I ck ·(U j -U m )| (3)

[0044] The total power flowing into or out of node m is P tm :

[0045] Among them, H dm is the set of downstream nodes of node m, P Lm is the load power of node m. Change the above formula into matrix form: A t P t =P L +P loss (5)

[0046] Among them, P t and P L They are P t and P Lm The vector A t is a matrix, P loss is a vector, defined as follows:

[0047] Among them, N and M are the total number of nodes of the traction depot and train respectively.

[0048] In step S103 , based on a preset power flow tracking algorithm, real-time power flow tracking is performed according to the power flow of each branch and the power flow of each node to determine the carbon emission intensity of the power node.

[0049] Specifically, the embodiment of the present invention inputs the power flows of branches and nodes into a classic power flow tracking algorithm to perform real-time power flow tracking. The specific process is as follows:

[0050] If there is a power P output from node m Gm , then based on (5):

[0051] Among them, e m is a unit vector whose mth element is equal to 1. Then based on (8), the load power P output from node m to node j is LmThe power is P Gm,Lm :

[0052] The above calculations describe a power flow tracking method for a DC traction power supply system;

[0053] After completing the power flow tracking, the carbon emission flow needs to be calculated. It is assumed that the electric energy, power, carbon emission flow and carbon flow rate are represented by E, P, F and ζ respectively. Among them, the units of electric energy and power can be expressed in kWh and MW, and the units of carbon emission flow and carbon flow rate can be expressed in kgCO2 and kgCO2 / s. It is stipulated that the outflow from the node is the positive direction of electric energy, power, carbon emission flow and carbon flow rate. The carbon emission flow of a node represents the carbon emission responsibility. For example, if F = 1kgCO2, it is considered that the node has transferred the carbon emission responsibility of 1kgCO2 outward; if F = -1kgCO2, it is considered that the node needs to bear the carbon emission responsibility of 1kgCO2. The carbon flow rate is the derivative of the carbon emission flow with respect to time t:

[0054] The carbon emission flow method calculates the carbon emission intensity e of node power and branch power, that is, how many kgCO2 of carbon emission responsibility is contained in each kWh of electricity. Therefore, the carbon emission intensity of the power supply node must be determined first. There are three types of power supply nodes in the DC traction power supply system: external power supply, renewable energy, and trains that generate electricity through regenerative braking. When the power supply node is an external power supply, the carbon emission intensity of the power supply node is determined through the external power grid; when the power supply node is renewable energy, the carbon emission intensity of the power supply node is zero; when the power supply node is a train that generates electricity through regenerative braking, a train carbon emission flow model is established, and the carbon emission intensity of the power supply node is calculated using the train carbon emission flow model. The train carbon emission flow model is:

[0055] There are several trains running in the DC traction power supply system. Assume that for the i-th train, the first total inflow electric energy E of the i-th train in the preset time period is obtained. i and carbon emission flow F i , and then calculate the second total inflow of electric energy and carbon emission flow of the i-th train between the two stations, which are recorded as E vi and F vi When the train stops at the station, it is necessary to clear E vi and F vi .

[0056] After the train starts, it needs to obtain electrical energy to accelerate and overcome resistance. Assuming that the time step for calculating carbon emission responsibility is Δt, during the stage when the train flows into electrical energy, the total electrical energy and total carbon emission responsibility flowing into the train after it starts are continuously accumulated: E vi (t) = E vi (t-Δt)+P i(t)Δt (11) E i (t) = E i (t-Δt)+P i (t)Δt (12) F vi (t) = F vi (t-Δt)+ζ i (t)Δt (13) F i (t) = F i (t-Δt)+ζ i (t)Δt (14) ζ i (t) = P i (t)·e i (t) (15)

[0057] Among them, t is the current time point, Δt is the time step for carbon emission responsibility calculation, E vi P is the total inflow of electric energy between the two stations of the preset train i, i is the power of the preset train i, E i is the total inflow electric energy accumulated by the preset train i in the preset time period, F vi is the total inflow carbon emission flow of the preset train i between two stations, ζ i (t) is the carbon emission rate of the preset train i, F i is the total inflow carbon emission flow accumulated by the preset train i in the preset time period, e i is the carbon emission intensity of the node of the preset train i, which is determined by the carbon emission intensity of other power supply points.

[0058] When there is no more electricity flowing into the train and the train starts to flow out electricity, the carbon emission intensity of the train as a power source is calculated as: e i (t) = F vi (t) / E vi (t) (16)

[0059] At the same time, other relevant physical quantities are updated synchronously according to (11)-(15).

[0060] In step S104, the carbon emission responsibility of the transmission on the branch and the carbon emission responsibility of the node are calculated according to the carbon emission intensity of the power supply node to obtain a carbon emission responsibility calculation result of the DC traction power supply system for real-time operation.

[0061] Specifically, after obtaining the carbon emission intensity of the train, the carbon emission intensity of all power nodes is known. The carbon emission intensity of branches and load nodes can be calculated according to the proportional sharing principle, and the carbon emission responsibility of the load can be obtained by multiplying the carbon emission intensity by the power consumption of each load.

[0062] When the train arrives at the next station again, Ei and F i No processing, clear E again vi and F vi , so as to calculate the next train operation section.

[0063] It should be noted that the carbon emission responsibility calculation method of the DC traction power supply system in the embodiment of the present invention is applicable to both flexible DC traction power supply systems and other DC traction power supply systems, such as DC traction power supply systems that use diode rectifier units, diode rectifier unit energy feedback devices, and energy routers as main power supply equipment; it is also applicable to different access methods of new energy, such as access on the DC contact network, access at the DC bus of the traction station, and access on the AC side.

[0064] According to the carbon emission responsibility calculation method for a DC traction power supply system proposed in an embodiment of the present invention, a complete carbon emission responsibility calculation framework is proposed for real-time operation application scenarios, thereby realizing carbon emission responsibility accounting; a train carbon emission flow model is proposed, so that the carbon emission flow method can take into account the energy producer and consumer characteristics of the train and calculate the carbon emission responsibility transfer during regenerative braking of the train; the calculation method makes full use of the common measurement conditions in engineering projects and the special topological structure of the system.

[0065] Next, a device for calculating carbon emission responsibility of a DC traction power supply system according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0066] FIG4 is a block diagram of a device for calculating carbon emission responsibility of a DC traction power supply system according to an embodiment of the present invention.

[0067] As shown in FIG4 , the DC traction power supply system carbon emission responsibility calculation device 10 includes: an acquisition module 100 , a construction module 200 , a determination module 300 and a calculation module 400 .

[0068] Among them, the acquisition module 100 is used to obtain real-time electrical information and real-time train position information of multiple traction stations in the DC traction power supply system. The construction module 200 is used to establish the node position relationship of any line between any adjacent traction stations based on the real-time train position information, and obtain the power flow of each branch and the power flow of each node based on the node position relationship and real-time electrical information. The determination module 300 is used to perform real-time power flow tracking based on the power flow of each branch and the power flow of each node based on a preset power flow tracking algorithm to determine the carbon emission intensity of the power supply node. The calculation module 400 is used to calculate the carbon emission responsibility transmitted on the branch and the carbon emission responsibility of the node based on the carbon emission intensity of the power supply node to obtain the carbon emission responsibility calculation result of the DC traction power supply system for real-time operation.

[0069] Optionally, in an embodiment of the present invention, the real-time electrical information includes: the voltage of the DC side ports of multiple traction substations in the DC traction power supply system, the grid feeder current from the traction substation to the traction network, at least one of the voltage information of all trains and the current information of all trains; the real-time train position information includes at least one of the position information of the section where the train is located and the relative position relationship between all trains and the traction substation.

[0070] Optionally, the determination module includes:

[0071] An acquisition unit, used to obtain the actual type of the power node;

[0072] A first determining unit is configured to determine the carbon emission intensity of the power supply node through the external power grid when the actual type is an external power source;

[0073] The second determining unit is configured to determine that the carbon emission intensity of the power source node is zero when the actual type is new energy;

[0074] The calculation unit is used to establish a train carbon emission flow model when the actual type is a train that generates electricity through regenerative braking, and calculate the carbon emission intensity of the power node through the train carbon emission flow model.

[0075] Optionally, the calculation unit is specifically used to obtain a first total inflow of electric energy and carbon emission flow of the target train within a preset time period, and a second total inflow of electric energy and carbon emission flow of the target train between two stations; and establish a train carbon emission flow model using the first total inflow of electric energy and carbon emission flow and the second total inflow of electric energy and carbon emission flow, wherein the calculation formula of the train carbon emission flow model is: E vi (t) = E vi (t-Δt)+P i (t)Δt E i (t) = E i (t-Δt)+P i (t)Δt F vi (t) = F vi (t-Δt)+ζ i (t)Δt F i (t) = F i (t-Δt)+ζ i (t)Δtζ i (t) = P i (t)·e i (t) e i (t) = F vi (t) / E vi (t)

[0076] Among them, t is the current time point, Δt is the time step for carbon emission responsibility calculation, E viP is the total inflow of electric energy between the two stations of the preset train i, i is the power of the preset train i, E i is the total inflow electric energy accumulated by the preset train i in the preset time period, F vi is the total inflow carbon emission flow of the preset train i between two stations, ζ i The carbon emission responsibility of the preset train i, F i is the total inflow carbon emission flow accumulated by the preset train i in the preset time period, e i is the node carbon emission intensity of the preset train i.

[0077] It should be noted that the above explanation of the embodiment of the method for calculating the carbon emission responsibility of a DC traction power supply system is also applicable to the device for calculating the carbon emission responsibility of a DC traction power supply system of this embodiment, and will not be repeated here.

[0078] According to the carbon emission responsibility calculation device for a DC traction power supply system proposed in an embodiment of the present invention, a complete carbon emission responsibility calculation framework is proposed for real-time operation application scenarios, thereby realizing carbon emission responsibility accounting; a train carbon emission flow model is proposed, so that the carbon emission flow method can take into account the energy producer and consumer characteristics of the train and calculate the carbon emission responsibility transfer during regenerative braking of the train; the calculation method makes full use of the common measurement conditions in engineering projects and the special topological structure of the system.

[0079] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0080] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "N" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0081] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or N executable instructions for implementing a custom logical function or step of a process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention pertain.

Claims

1. A method for calculating carbon emission responsibility of a DC traction power supply system, characterized in that: The following steps are involved: Obtain real-time electrical information and real-time train position information of multiple traction stations in the DC traction power supply system; Establishing a node position relationship of any line between any adjacent traction stations according to the real-time train position information, and obtaining a power flow of each branch and a power flow of each node according to the node position relationship and the real-time electrical information; Based on a preset power flow tracking algorithm, real-time power flow tracking is performed according to the power flow of each branch and the power flow of each node to determine the carbon emission intensity of the power supply node; The carbon emission responsibility of the transmission on the branch and the carbon emission responsibility of the node are calculated according to the carbon emission intensity of the power supply node to obtain the carbon emission responsibility calculation result of the DC traction power supply system for real-time operation.

2. The method for calculating carbon emission responsibility of a DC traction power supply system according to claim 1 is characterized in that: The real-time electrical information includes: the voltage of the DC side ports of multiple traction depots in the DC traction power supply system, the feeder current from the traction depot to the traction network, all train voltage information and all train current information; the real-time train position information includes at least one of the section position information of all trains and the relative position relationship between all trains and the traction depot.

3. The method for calculating carbon emission responsibility of a DC traction power supply system according to claim 1, characterized in that: The determining of the carbon emission intensity of the power node includes: Obtaining the actual type of the power node; In the case where the actual type is an external power source, determining the carbon emission intensity of the power source node through the external power grid; In the case where the actual type is new energy, the carbon emission intensity of the power node is zero; In the case where the actual type is a train that generates electrical energy through regenerative braking, a train carbon emission flow model is established, and the carbon emission intensity of the power supply node is calculated through the train carbon emission flow model.

4. The method for calculating carbon emission responsibility of a DC traction power supply system according to claim 3 is characterized in that: The establishing of the train carbon emission flow model and calculating the carbon emission intensity of the power supply node by using the train carbon emission flow model includes: Acquire a first total inflow of electric energy and a carbon emission flow of a target train within a preset time period, and a second total inflow of electric energy and a carbon emission flow of the target train between two stations; The train carbon emission flow model is established by using the first total inflow electric energy and carbon emission flow and the second total inflow electric energy and carbon emission flow, wherein the calculation formula of the train carbon emission flow model is: E vi (t)=E vi (t-Δt)+P i (t)Δt E i (t)=E i (t-Δt)+P i (t)Δt F vi (t)=F vi (t-Δt)+ζ i (t)Δt F i (t)=F i (t-Δt)+ζ i (t)Δt ζ i (t)=P i (t)·e i (t) e i (t)=F vi (t) / E vi (t) Where t is the current time point, Δt is the time step for calculating carbon emission responsibility, and E vi is the total inflow of electric energy of the preset train i between two stations, P i is the power of the preset train i, E i is the total inflow electric energy accumulated by the preset train i in the preset time period, F vi is the total inflow carbon emission flow of the preset train i between two stations, ζ i The carbon emission responsibility of train i is assumed to be i is the total inflow carbon emission flow accumulated by the preset train i in the preset time period, e i is the node carbon emission intensity of the preset train i.

5. A device for calculating carbon emission responsibility of a DC traction power supply system, characterized in that: include: An acquisition module is used to acquire real-time electrical information and real-time train position information of multiple traction stations in a DC traction power supply system; A construction module, used to establish a node position relationship of any line between any adjacent traction stations according to the real-time train position information, and obtain the power flow of each branch and the power flow of each node according to the node position relationship and the real-time electrical information; A determination module, configured to perform real-time power flow tracking according to the power flow of each branch and the power flow of each node based on a preset power flow tracking algorithm to determine the carbon emission intensity of the power supply node; The calculation module is used to calculate the carbon emission responsibility of the transmission on the branch and the carbon emission responsibility of the node according to the carbon emission intensity of the power supply node, so as to obtain the carbon emission responsibility calculation result of the DC traction power supply system for real-time operation.

6. The device for calculating carbon emission responsibility of a DC traction power supply system according to claim 5, characterized in that: The real-time electrical information includes: the voltage of the DC side ports of multiple traction depots in the DC traction power supply system, the feeder current from the traction depot to the traction network, all train voltage information and all train current information, and at least one of the real-time train position information includes the train section position information and the relative position relationship between all trains and the traction depot.

7. The device for calculating carbon emission responsibility of a DC traction power supply system according to claim 5, characterized in that: The determination module comprises: An acquisition unit, used for acquiring an actual type of the power supply node; A first determining unit, configured to determine the carbon emission intensity of the power supply node through an external power grid when the actual type is an external power supply; A second determining unit, configured to determine that the carbon emission intensity of the power source node is zero when the actual type is new energy; A calculation unit is used to establish the train carbon emissions when the actual type is a train that generates electric energy through regenerative braking. The discharge flow model calculates the carbon emission intensity of the power supply node through the train carbon emission flow model.

8. The device for calculating carbon emission responsibility of a DC traction power supply system according to claim 7, characterized in that: The computing unit is specifically used for: Acquire a first total inflow of electric energy and a carbon emission flow of a target train within a preset time period, and a second total inflow of electric energy and a carbon emission flow of the target train between two stations; The train carbon emission flow model is established by using the first total inflow electric energy and carbon emission flow and the second total inflow electric energy and carbon emission flow, wherein the calculation formula of the train carbon emission flow model is: E vi (t)=E vi (t-Δt)+P i (t)Δt E i (t)=E i (t-Δt)+P i (t)Δt F vi (t)=F vi (t-Δt)+ζ i (t)Δt F i (t)=F i (t-Δt)+ζ i (t)Δt ζ i (t)=P i (t)·e i (t) e i (t)=F vi (t) / E vi (t) Where t is the current time point, Δt is the time step for calculating carbon emission responsibility, and E vi is the total inflow of electric energy of the preset train i between two stations, P i is the power of the preset train i, E i is the total inflow electric energy accumulated by the preset train i in the preset time period, F vi is the total inflow carbon emission flow of the preset train i between two stations, ζ i The carbon emission responsibility of train i is assumed to be i is the total inflow carbon emission flow accumulated by the preset train i in the preset time period, e i is the node carbon emission intensity of the preset train i.

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