CN114091214A - Method and device for simulating urban rail Y-type line power supply system with main lines and branch lines independently operated - Google Patents
Method and device for simulating urban rail Y-type line power supply system with main lines and branch lines independently operated Download PDFInfo
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Abstract
The invention discloses a method and a device for simulating an urban rail Y-type line power supply system with independent operation of main branches, wherein the method comprises the following steps: acquiring information required by power supply system simulation calculation of the urban rail transit Y-shaped line; exporting a power supply system model file from a main wiring diagram of a power supply system by using a graph-model integration technology; generating a simulation parameter file based on the information required by the power supply system simulation calculation; analyzing the simulation parameter file to generate a running chart simulation file; analyzing the operation diagram simulation file and the power supply system model file, and then calculating the power supply system by using an alternating current-direct current alternative iterative power flow algorithm to obtain the power flow change condition of the power supply system within a period of time; according to the invention, the tidal current distribution of the whole line of the Y-shaped line of the urban rail is obtained through computer simulation, and on the basis, the application of dispatcher training simulation, dispatching scheme simulation and the like can be developed, so that technical support is provided for dispatching decision of urban rail electric regulators.
Description
Technical Field
The invention relates to a method and a device for simulating an urban rail Y-type line power supply system with independent operation of a main branch, belonging to the technical field of urban rail transit power supply system simulation.
Background
The urban rail transit has the advantages of large transportation capacity, environmental friendliness, convenience, rapidness, punctuality, high efficiency and the like, is an important part of daily travel of people at present, develops urban rail transit and has important significance for relieving urban traffic jam. With the great advance of urban rail transit construction, urban rail transit line network structures of various cities in China are more and more complex, and urban rail transit operation is gradually transited to networked operation from original single-line operation.
The learners define the urban rail transit network operation technology as a general term of a series of transportation organization methods and measures which are adopted to improve the working efficiency and the service level of an operation unit and improve the safety and the stability of system operation under the condition of urban rail transit network formation. The multi-intersection operation is an important component of urban rail transit networked operation.
In addition, due to the influence of various factors such as urban planning, economic level, geographic environment and the like, the population distribution of different areas of the city has certain difference, and the traveling demands also have certain dispersion. In order to further meet the traveling demands of passengers and improve the operation service level of urban rail transit, an urban rail Y-shaped line comes from the beginning, a new branch line is built on the basis of a main line of the urban rail transit line, and the main line and the branch line are intersected at a certain point.
Meanwhile, in order to save urban land resources and improve the power supply reliability of the urban rail transit power supply system, the sharing of the power supply resources of the 110kV main substation is also the trend of the current urban rail transit construction.
The multi-traffic-road operation and the power supply resource sharing of the main transformer station are possibly generated in the Y-shaped line of the urban rail, and for the line, the traditional urban rail transit power supply system simulation method is not suitable any more, and a plurality of defects exist in the whole-line tide distribution of the line and the scheduling decision of urban rail electric tuning personnel.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a simulation method and a device for an urban rail Y-type line power supply system with independent operation of a main branch, obtains the tidal current distribution of the whole line of the urban rail Y-type line through computer simulation, can develop application such as dispatcher training simulation and transfer scheme simulation on the basis, and provides technical support for the dispatching decision of urban rail electric transfer personnel.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
in a first aspect, the present invention provides a method for simulating an urban rail Y-type line power supply system with independent operation of a main branch, comprising:
acquiring information required by power supply system simulation calculation of the urban rail transit Y-shaped line;
conducting expansion modeling on each conducting device of the urban rail transit power supply system based on a public information model in IEC61970 series standards, establishing a public information model of the urban rail transit power supply system, and exporting a power supply system model file from a main wiring diagram of the power supply system by applying a graph-model integration technology;
generating a simulation parameter file based on the information required by the power supply system simulation calculation;
analyzing the simulation parameter file, and performing train operation simulation on each operation intersection based on an analysis result to generate an operation diagram simulation file;
analyzing the operation diagram simulation file and the power supply system model file, and then calculating the power supply system by using an alternating current-direct current alternative iterative power flow algorithm to obtain the power flow change condition of the power supply system in a period of time.
Further, the information required by the power supply system simulation calculation includes element information and topology relation simulation parameters thereof, and the topology relation simulation parameters include operation line parameters, vehicle parameters and traffic operation parameters.
Further, the operation line parameters include line slopes, curves, station names and position information, the vehicle parameters include traction characteristics, braking characteristics, train running speed, acceleration upper limit and basic resistance parameter information of trains, and the traffic running parameters include starting point, terminal point and departure interval information of running traffic.
Further, the simulation parameter file comprises an operation line parameter, a vehicle parameter and a traffic operation parameter.
Further, the alternating current-direct current alternating iteration power flow algorithm comprises alternating current power flow calculation and direct current power flow calculation, wherein the alternating current power flow is calculated by using a Newton-Raphson method, and the direct current power flow is calculated by using a node voltage method.
Further, calculating the power supply system by using an alternating current-direct current alternating iteration power flow algorithm to obtain the power flow change condition of the power supply system in a period of time, wherein the method comprises the following steps:
forming an AC side node admittance matrix according to the AC transmission line parameters, and forming a DC side node admittance matrix according to the DC transmission line parameters;
initializing the working state of each substation;
performing a DC power flow step, the DC power flow step comprising: respectively carrying out direct current side tide of the main line and the branch line, and collecting the power of each traction substation;
updating the working state of the traction substation according to the voltage and the current at the outlet of the traction substation;
judging whether the direct current power flow is converged, if so, entering the next step, and otherwise, returning to the direct current power flow step;
executing a step of judging the node type, wherein the step of judging the node type comprises the following steps: judging whether node types of the traction substation are switched or not according to the working state of the regenerative energy feeder, if so, updating the node types, and switching to the step of judging the node types again, otherwise, directly entering the next step;
and carrying out alternating current side power flow calculation, updating the voltage of each node on the alternating current side, judging whether convergence occurs or not, finishing the calculation if a convergence condition is met, judging whether simulation time is reached or not if the convergence condition is not met, finishing the calculation if the simulation time is reached, and returning to the direct current power flow step if the simulation time is not reached.
In a second aspect, the present invention provides an urban rail Y-type line power supply system simulation apparatus with main lines and branch lines operating independently, including:
the power supply system information collection unit is used for collecting power supply system information of the urban rail transit Y-shaped line with the main line and the branch line independently operated;
the power supply system expansion modeling unit is used for carrying out expansion modeling on each conductive device of the urban rail transit power supply system based on a public information model in IEC61970 series standards, establishing a public information model of the urban rail transit power supply system, and exporting a power supply system model file from a main wiring diagram of the power supply system by applying a graph-model integration technology;
the simulation parameter file generating unit is used for generating a simulation parameter file based on the information required by the power supply system simulation calculation;
the operation diagram simulation file generation unit is used for analyzing the simulation parameter file, and performing train operation simulation on each operation intersection based on an analysis result to generate an operation diagram simulation file;
and the power supply system calculation unit is used for analyzing the operation diagram simulation file and the power supply system model file, and then calculating the power supply system by applying an alternating current-direct current alternative iterative power flow algorithm to obtain the power flow distribution of the whole line of the Y-shaped line of the urban rail.
Further, the information required by the power supply system simulation calculation includes element information and topological relation simulation parameters thereof, the topological relation simulation parameters include operation line parameters, vehicle parameters and cross-road operation parameters, the operation line parameters include line slopes, curves, station names and position information, the vehicle parameters include traction characteristics, braking characteristics, train operation speed, acceleration upper limit and basic resistance parameter information of trains, and the cross-road operation parameters include start point, end point and departure interval information of operation cross roads.
In a third aspect, the invention provides an urban rail Y-type line power supply system simulation device with main lines and branch lines independently operated, which comprises a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any of the above.
In a fourth aspect, the invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of any of the methods described above.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, through computer simulation, a power supply system model file is generated, a simulation parameter file is generated, a running chart simulation file is generated, the running chart simulation file and the power supply system model file are analyzed, then an alternating current-direct current alternative iterative power flow algorithm is applied to calculate the power supply system, and the power flow distribution of the whole line of the Y-shaped line of the urban rail is obtained.
Drawings
FIG. 1 is a schematic diagram of an urban railway Y-type line with independent operation of main branches;
FIG. 2 is a flow chart of a simulation method for an urban railway Y-type line power supply system with independent operation of a main branch;
FIG. 3 is a schematic diagram of various structures and associated systems of a CIM model of an urban railway Y-type line power supply system;
FIG. 4 is a schematic view of a train operation diagram;
fig. 5 is a schematic diagram of an alternating current-direct current alternating iteration algorithm.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
The embodiment introduces a simulation method of an urban rail Y-type line power supply system with main lines and branch lines independently operated, which comprises the following steps:
acquiring information required by power supply system simulation calculation of the urban rail transit Y-shaped line;
conducting expansion modeling on each conducting device of the urban rail transit power supply system based on a public information model in IEC61970 series standards, establishing a public information model of the urban rail transit power supply system, and exporting a power supply system model file from a main wiring diagram of the power supply system by applying a graph-model integration technology;
generating a simulation parameter file based on the information required by the power supply system simulation calculation;
analyzing the simulation parameter file, and performing train operation simulation on each operation intersection based on an analysis result to generate an operation diagram simulation file;
analyzing the operation diagram simulation file and the power supply system model file, and then calculating the power supply system by using an alternating current-direct current alternative iterative power flow algorithm to obtain the power flow distribution of the whole line of the Y-shaped line of the urban rail.
Referring to fig. 1, a schematic diagram of an urban railway Y-type line with independent operation of a main branch is shown. In the figure, AOB is a main line operation section, and AOC is a branch line operation section, and in this operation mode, a main line train does not operate on a branch line but operates only on a main line, and a branch line train does not operate on a main line but operates only on a branch line.
Referring to fig. 2, the application process of the method for simulating the power supply system of the Y-type circuit of the urban rail, in which the main branch operates independently, specifically involves the following steps:
(1) collecting power supply system information and simulation parameters;
(2) generating a power supply system model file;
(3) generating a simulation parameter file;
(4) generating a running chart simulation file;
(5) and analyzing the operation diagram simulation file.
(6) And calculating the power supply system by using an alternating current-direct current alternating iterative power flow algorithm.
In the step (1), the collected power supply system information mainly comprises system element information and topological relation simulation parameters thereof, wherein the topological relation simulation parameters comprise operation line parameters, vehicle parameters and traffic operation parameters; the line parameters mainly comprise information such as gradients, curves and station positions, the vehicle parameters mainly comprise information such as traction characteristics and braking characteristics of trains, upper limits of running speeds and accelerations of the trains and basic resistance parameters, and the traffic running parameters mainly comprise information such as starting points, end points and departure intervals of running traffic.
In the step (2), an information model of the power supply system is established based on a common information model CIM in the IEC61970 series standard, and a data class diagram of the CIM model of the power supply system is shown in fig. 3.
Referring to fig. 2, the figure includes:
the HostControlArea class: and the voltage control area information indicates which urban rail transit line.
Subcotrolarea class: and the urban rail transit line information indicates which line is specific.
Substation type: the substation information includes information such as names and lines to which the substation belongs.
The RailLine class: subway line information, which indicates which subway line is, is similar to the subontrolarea category.
BaseVoltage class: reference voltage information.
VoltageLevel class: the voltage grade information includes reference voltage information and information of the substation to which the reference voltage information belongs.
The ACLIESegment class: the AC line type comprises information of line ID, name, impedance, node, transformer substation at two ends and the like.
DCLineSegement class: the direct current lines comprise information such as line ID, name, whether a steel rail is arranged upwards or not, impedance, nodes, transformer substations at two ends, the affiliated rail traffic line and the like.
BusbarSection class: and the alternating current bus information comprises bus ID, name, belonging voltage class, node and other information.
DCBusbarSection class: the direct current bus information comprises bus ID, name, belonging voltage class, node and other information.
Breaker type: the breaker information comprises information such as breaker ID, name, opening and closing state, node and affiliated voltage class.
Type Disconnector: the isolation switch information comprises information such as an isolation switch ID, a name, an opening and closing state, a node and an affiliated voltage grade.
EnergyConsumer class: the equivalent load information comprises information such as an equivalent load ID, a name, apparent power, a belonging voltage grade and the like.
Class DCSwitch: the dc switch information includes information such as the ID, name, node and voltage class of the dc switch.
The syncronous machine class. The generator class comprises information of generator name, ID, rated power, belonging voltage class and the like.
Terminal class. And the node class comprises CN number information of the node.
Rectifier class: the information of the rectifier unit comprises information of the rectifier unit ID, name, capacity, high-voltage side rated voltage, valve side rated voltage, ride-through impedance, half-ride-through impedance, voltage regulation rate, a transformer substation to which the voltage regulation rate belongs and the like.
RectifierEnd class: the rectifier unit end information comprises information such as a rectifier unit end ID, a name, a node, whether the anode is arranged, an affiliated rectifier unit, an affiliated voltage grade and the like.
EnergyFeedback class: and the information of the inversion feedback device comprises information of the ID, the name, the node, the starting voltage, the capacity, the equivalent impedance, the transformer substation and the like of the inversion feedback device.
EnergyFeedbackEnd class: the inversion feedback end class comprises information such as the ID, name, node, whether the AC side exists, whether the anode exists, the belonging inversion feedback device, the belonging voltage grade and the like.
Powertransform class: and the transformer class comprises information such as ID, name, affiliated substation and affiliated voltage class of the transformer.
Transformerwining class. The transformer winding class comprises information such as transformer winding name, ID, rated voltage, rated power, nodes, impedance, the transformer and the voltage class.
In the step (3), the simulation parameter file mainly includes a line parameter of the Y-shaped line, a vehicle parameter and a traffic parameter. The line parameters mainly comprise information such as the gradient, the curve and the station position of the line. The vehicle parameters mainly comprise the traction force characteristic, the braking force characteristic, the traction flow taking characteristic and the braking flow taking characteristic of the train. The traffic parameters comprise the starting point and the end point of the traffic, and if the fast and slow vehicles are considered in the traffic operation, information of passing stop along the way needs to be further given. The parameters are generally provided by a design institute, and are manually input according to a certain format to obtain a simulation parameter file,
in the step (4), a running chart simulation file is generated, firstly the running chart simulation file is subjected to parameter simulation to obtain line parameters, vehicle parameters and crossing parameters of a Y-shaped line, and traction calculation of the single train is performed on the basis of the line parameters and the vehicle parameters according to different strategies (such as time-saving strategies, energy-saving strategies and the like) to simulate the running process of the single train from a line starting point to a line ending point, and the flow taking sizes of the single train at different positions on the line are obtained according to the traction flow taking characteristics and the braking flow taking characteristics of the train.
And after the traction calculation is finished, paving the operation diagram according to the traction calculation result.
Referring to fig. 4, an exemplary operation diagram of a subway train is shown, in which the horizontal axis is time, the vertical axis is a station, and the height of the station on the vertical axis corresponds to its kilometer scale, and the operation track of each train within 1200s of the whole line under the departure interval of 180s is shown. The operation diagram is divided into an ascending operation diagram and a descending operation diagram, and the process of laying the operation diagram by the operation track of a single train is briefly described by taking the ascending operation diagram as an example.
Firstly, the running track of the single ascending train from 1 to 1200s is taken, namely a curve passing through the origin in fig. 3, the train corresponding to the running track is defined as K1, and the curve is defined as L1. Taking L1 as a boundary, the other trajectory lines of the ascending trajectory chart are divided into a line on the left side of the line L1 and a line on the right side of the line L1, and it is assumed that the curve closest to L1 on the left side of L1 is Ll1, and the curve closest to L1 on the right side of L1 is Lr 1. In the figure, the starting point of the Ll1 is the running position of the K1 after 180s, so that the Ll1 is obtained by taking the running track of the single ascending train from 181 to 1380s, similarly, the left side approach curve of the Ll1 is obtained by taking the running track of the single ascending train from 361 to 1560s, the running track generation curves within 1200s are sequentially taken at intervals of 180s, and if the running time of the train is less than 1200s, the train arrives at the terminal, the running track of the train from the departure to the terminal is taken.
Assuming that Lr1 is the running track of the train Kr1, after K1 starts for 180s, Kr1 starts from the starting point, so Lr1 is obtained by taking the running track of the single train on the upper run from 1 to 1020s, and similarly, the approach curve on the right side of Lr1 is obtained by going to the running track of the single train on the upper run from 1 to 840 s.
In the step 5), the model file is analyzed. The method comprises the steps of firstly reading a model file of a power supply system by using an object-oriented programming language, storing information of each conductive device of the power supply system into a database according to incidence relations of various types in a CIM (common information model) of the power supply system, and then calculating the load flow distribution condition of the power supply system of the Y-shaped line of the urban railway by using a load flow algorithm of alternating current and alternating current iteration. The flow chart of the alternating current and direct current alternating iteration power flow algorithm is shown in figure 5.
The alternating current-direct current alternating iteration power flow algorithm comprises alternating current power flow calculation and direct current power flow calculation. The alternating current power flow is calculated by a Newton-Raphson method, and the direct current power flow is calculated by a node voltage method.
In ac power flow, a substation is regarded as a PQ node, and the values of P and Q thereof need to be obtained by dc power flow. Firstly, direct current flow calculation is carried out, in the direct current flow, a traction substation is equivalent to an ideal voltage source series resistor, a train is equivalent to a power source, and power P, Q of the substation is obtained through a node voltage method. And after the P value and the Q value are obtained by the power transformation, alternating current load flow calculation is started, after iterative convergence of the alternating current load flow calculation, the direct current side node voltage is updated according to the alternating current side node voltage obtained by the alternating current side load flow calculation, and then whether the running state of a traction substation in the power supply system changes or not is judged. The general traction substation is provided with two converter devices, namely a rectifier set and a regenerative energy feeder device, wherein the two converter devices can adjust the running state of the traction substation according to the voltage and current values at the outlet of the traction substation, and specific control strategies are not repeated here. And if the state of the traction substation does not change, finishing the calculation by the alternating current-direct current alternating iterative power flow algorithm, otherwise, continuing to perform alternating current-direct current alternating iterative calculation until the final power flow is converged.
The alternating current-direct current alternating iteration power flow algorithm specifically comprises the following solving steps:
1. and forming an AC side node admittance matrix according to the AC transmission line parameters, and forming a DC side node admittance matrix according to the DC transmission line parameters.
2. And initializing the working state of each substation.
3. Firstly, the direct current side power flows of a main line and a branch line are respectively carried out, and the power of each traction substation is collected.
4. And updating the working state of the traction substation according to the voltage and the current at the outlet of the traction substation.
5. And judging whether the direct current power flow is converged, if so, entering the step 5, and otherwise, returning to the step 3.
6. And judging whether node type switching (PQ node and PV node) exists in the traction substation according to the working state of the regenerative energy feeder, if so, updating the node type, and then entering the step 6, otherwise, directly entering the step 6.
7. And carrying out load flow calculation on the alternating current side, and then updating the voltage of each node on the alternating current side. And judging whether convergence is achieved or not, if the convergence condition is achieved, finishing the calculation, if the convergence condition is not achieved, judging whether the maximum iteration frequency is achieved or not, if the maximum iteration frequency is achieved, finishing the calculation, if the maximum iteration frequency is not achieved, t is t +1, and returning to the step 3.
It is briefly explained what the traction substation has PQ and PV node switching in step 6 above. When the train is braked, the train feeds back power to the traction network, the network voltage of the traction network rises, after the starting voltage of the regenerative energy feedback device is reached, the regenerative energy feedback device is started, and the rectifier unit is in a closed state. The regenerative energy feeder can stabilize the network voltage of the traction network near the starting voltage, and at the moment, the traction substation is regarded as a PV node in alternating current power flow. When the feedback power is larger than the rated power of the regenerative energy feeder, the regenerative energy feeder operates in a full power state, the network voltage of the traction network is further increased, and the traction substation is regarded as a PQ node in the alternating current power flow.
Example 2
This embodiment provides urban rail Y type line power supply system simulation device that main branch line independently operated, includes:
the power supply system information collection unit is used for acquiring information required by power supply system simulation calculation of the urban rail transit Y-shaped line;
the power supply system expansion modeling unit is used for carrying out expansion modeling on each conductive device of the urban rail transit power supply system based on a public information model in IEC61970 series standards, establishing a public information model of the urban rail transit power supply system, and exporting a power supply system model file from a main wiring diagram of the power supply system by applying a graph-model integration technology;
the simulation parameter file generating unit is used for generating a simulation parameter file based on the information required by the power supply system simulation calculation;
the operation diagram simulation file generation unit is used for analyzing the simulation parameter file, and performing train operation simulation on each operation intersection based on an analysis result to generate an operation diagram simulation file;
and the power supply system calculation unit is used for analyzing the operation diagram simulation file and the power supply system model file, and then calculating the power supply system by applying an alternating current-direct current alternative iterative power flow algorithm to obtain the power flow distribution of the whole line of the Y-shaped line of the urban rail.
Further, the information required by the power supply system simulation calculation includes element information and topological relation simulation parameters thereof, the topological relation simulation parameters include operation line parameters, vehicle parameters and cross-road operation parameters, the operation line parameters include line slopes, curves, station names and position information, the vehicle parameters include traction characteristics, braking characteristics, train operation speed, acceleration upper limit and basic resistance parameter information of trains, and the cross-road operation parameters include start point, end point and departure interval information of operation cross roads.
Example 3
The embodiment provides an urban rail Y-type line power supply system simulation device with main lines and branch lines independently operated, which comprises a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any one of:
acquiring information required by power supply system simulation calculation of the urban rail transit Y-shaped line;
conducting expansion modeling on each conducting device of the urban rail transit power supply system based on a public information model in IEC61970 series standards, establishing a public information model of the urban rail transit power supply system, and exporting a power supply system model file from a main wiring diagram of the power supply system by applying a graph-model integration technology;
generating a simulation parameter file based on the information required by the power supply system simulation calculation;
analyzing the simulation parameter file, and performing train operation simulation on each operation intersection based on an analysis result to generate an operation diagram simulation file;
analyzing the operation diagram simulation file and the power supply system model file, and then calculating the power supply system by using an alternating current-direct current alternative iterative power flow algorithm to obtain the power flow distribution of the whole line of the Y-shaped line of the urban rail.
Example 4
The present embodiments provide a computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of any of the methods:
acquiring information required by power supply system simulation calculation of the urban rail transit Y-shaped line;
conducting expansion modeling on each conducting device of the urban rail transit power supply system based on a public information model in IEC61970 series standards, establishing a public information model of the urban rail transit power supply system, and exporting a power supply system model file from a main wiring diagram of the power supply system by applying a graph-model integration technology;
generating a simulation parameter file based on the information required by the power supply system simulation calculation;
analyzing the simulation parameter file, and performing train operation simulation on each operation intersection based on an analysis result to generate an operation diagram simulation file;
analyzing the operation diagram simulation file and the power supply system model file, and then calculating the power supply system by using an alternating current-direct current alternative iterative power flow algorithm to obtain the power flow distribution of the whole line of the Y-shaped line of the urban rail.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A main branch independent operation urban rail Y-type line power supply system simulation method is characterized by comprising the following steps:
acquiring information required by power supply system simulation calculation of the urban rail transit Y-shaped line;
conducting expansion modeling on each conducting device of the urban rail transit power supply system based on a public information model in IEC61970 series standards, establishing a public information model of the urban rail transit power supply system, and exporting a power supply system model file from a main wiring diagram of the power supply system by applying a graph-model integration technology;
generating a simulation parameter file based on the information required by the power supply system simulation calculation;
analyzing the simulation parameter file, and performing train operation simulation on each operation intersection based on an analysis result to generate an operation diagram simulation file;
analyzing the operation diagram simulation file and the power supply system model file, and then calculating the power supply system by using an alternating current-direct current alternative iterative power flow algorithm to obtain the power flow distribution of the whole line of the Y-shaped line of the urban rail.
2. The method for simulating an urban rail Y-type line power supply system operated by a main branch line independently as claimed in claim 1, wherein: the information required by the power supply system simulation calculation comprises element information and topological relation simulation parameters thereof, and the topological relation simulation parameters comprise operation line parameters, vehicle parameters and traffic operation parameters.
3. The method for simulating an urban rail Y-type line power supply system operated by a main branch line independently as claimed in claim 2, wherein: the operation line parameters comprise line ramps, curves, station names and position information, the vehicle parameters comprise traction characteristics, braking characteristics, train running speed, acceleration upper limit and basic resistance parameter information of trains, and the traffic operation parameters comprise starting point, terminal point and departure interval information of running traffic.
4. The method for simulating an urban rail Y-type line power supply system operated by a main branch line independently as claimed in claim 1, wherein: the simulation parameter file comprises an operation line parameter, a vehicle parameter and a traffic operation parameter.
5. The method for simulating an urban rail Y-type line power supply system operated by a main branch line independently as claimed in claim 1, wherein: the alternating current-direct current alternating iteration power flow algorithm comprises alternating current power flow calculation and direct current power flow calculation, wherein the alternating current power flow is calculated by using a Newton-Raphson method, and the direct current power flow is calculated by using a node voltage method.
6. The method for simulating an urban rail Y-type line power supply system operated by a main branch line independently as claimed in claim 1, wherein: calculating the power supply system by using an alternating current-direct current alternating iteration power flow algorithm to obtain the power flow change condition of the power supply system in a period of time, wherein the method comprises the following steps:
forming an AC side node admittance matrix according to the AC transmission line parameters, and forming a DC side node admittance matrix according to the DC transmission line parameters;
initializing the working state of each substation;
performing a DC power flow step, the DC power flow step comprising: respectively carrying out direct current side tide of the main line and the branch line, and collecting the power of each traction substation;
updating the working state of the traction substation according to the voltage and the current at the outlet of the traction substation;
judging whether the direct current power flow is converged, if so, entering the next step, and otherwise, returning to the direct current power flow step;
executing a step of judging the node type, wherein the step of judging the node type comprises the following steps: judging whether node types of the traction substation are switched or not according to the working state of the regenerative energy feeder, if so, updating the node types, and switching to the step of judging the node types again, otherwise, directly entering the next step;
and carrying out alternating current side power flow calculation, updating the voltage of each node on the alternating current side, judging whether convergence occurs or not, finishing the calculation if a convergence condition is met, judging whether the maximum iteration times are reached if the convergence condition is not met, finishing the calculation if the maximum iteration times are reached, and returning to the direct current power flow step if the maximum iteration times are not reached.
7. A main branch independent operation's urban orbit Y type line power supply system simulation device which characterized in that includes:
the power supply system information collection unit is used for acquiring information required by power supply system simulation calculation of the urban rail transit Y-shaped line;
the power supply system expansion modeling unit is used for carrying out expansion modeling on each conductive device of the urban rail transit power supply system based on a public information model in IEC61970 series standards, establishing a public information model of the urban rail transit power supply system, and exporting a power supply system model file from a main wiring diagram of the power supply system by applying a graph-model integration technology;
the simulation parameter file generating unit is used for generating a simulation parameter file based on the information required by the power supply system simulation calculation;
the operation diagram simulation file generation unit is used for analyzing the simulation parameter file, and performing train operation simulation on each operation intersection based on an analysis result to generate an operation diagram simulation file;
and the power supply system calculation unit is used for analyzing the operation diagram simulation file and the power supply system model file, and then calculating the power supply system by applying an alternating current-direct current alternative iterative power flow algorithm to obtain the power flow distribution of the whole line of the Y-shaped line of the urban rail.
8. The primary branch independent operation urban rail Y-line power supply system simulation apparatus according to claim 7, wherein: the information required by the power supply system simulation calculation comprises element information and topological relation simulation parameters thereof, the topological relation simulation parameters comprise operation line parameters, vehicle parameters and cross-road operation parameters, the operation line parameters comprise line ramps, curves, station names and position information, the vehicle parameters comprise traction characteristics, braking characteristics, train operation speed, acceleration upper limit and basic resistance parameter information of trains, and the cross-road operation parameters comprise start point, end point and departure interval information of operation cross roads.
9. A main branch line independent operation's urban orbit Y type line power supply system simulation device which characterized in that: comprising a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any one of claims 1 to 6.
10. A computer-readable storage medium having stored thereon a computer program, characterized in that: the program when executed by a processor implements the steps of the method of any one of claims 1 to 6.
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