CN111898208A - Train body overvoltage analysis method and device - Google Patents
Train body overvoltage analysis method and device Download PDFInfo
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Abstract
The application discloses a vehicle body overvoltage analysis method and device, wherein the method comprises the following steps: and obtaining an interference coupling path of the overvoltage of the train body, and establishing a three-dimensional model of the train body, a three-dimensional model of the high-voltage cable and an electromagnetic compatibility equivalent circuit model for power supply of the train. And establishing a vehicle body overvoltage analysis model by combining a vehicle body three-dimensional model, a high-voltage cable three-dimensional model and an electromagnetic compatibility equivalent circuit model according to an interference coupling path of the vehicle body overvoltage. And carrying out overvoltage analysis on the position to be detected on the three-dimensional model of the vehicle body according to the overvoltage analysis model of the vehicle body to obtain an overvoltage analysis result. Through the technical scheme of this application, can utilize automobile body overvoltage analysis model to wait to detect the overvoltage of position department on the three-dimensional model of automobile body and carry out the analysis to accurate assay automobile body is gone up the concrete position of overvoltage.
Description
Technical Field
The application relates to the technical field of rail trains, in particular to a train body overvoltage analysis method and device.
Background
The high-speed train motor train unit can operate a Vacuum Circuit Breaker (VCB) when a pantograph is lifted and a neutral section is passed. When the VCB acts, the train body can generate overvoltage, and the overvoltage of the train body can cause sensitive equipment on a train to break down, so that the normal operation of the motor train unit is influenced.
At present, in a method for analyzing overvoltage of a vehicle body, a circuit model is adopted for modeling, a high-voltage cable is equivalent to a distributed parameter model, and the vehicle body is equivalent to four-side impedance. However, the circuit model in the prior art cannot accurately analyze the specific position of the overvoltage on the vehicle body.
Disclosure of Invention
In order to solve the technical problem, the application provides a train body overvoltage analysis method and device, which are used for accurately analyzing the specific position of overvoltage on a train body.
In order to achieve the above purpose, the technical solutions provided in the embodiments of the present application are as follows:
in a first aspect, an embodiment of the present application provides a train body overvoltage analysis method, where the method includes:
obtaining an interference coupling path of the vehicle body overvoltage;
establishing a three-dimensional model of the vehicle body according to the first parameter of the vehicle body;
establishing a high-voltage cable three-dimensional model according to the second parameter of the high-voltage cable;
establishing an electromagnetic compatibility equivalent circuit model for train power supply;
according to the interference coupling path of the vehicle body overvoltage, a vehicle body overvoltage analysis model is established by combining the vehicle body three-dimensional model, the high-voltage cable three-dimensional model and the electromagnetic compatibility equivalent circuit model;
and performing overvoltage analysis on the position to be detected on the three-dimensional model of the vehicle body according to the overvoltage analysis model of the vehicle body to obtain an overvoltage analysis result.
Optionally, the first parameter is an actual size and material of the vehicle body.
Optionally, the second parameter is an actual size and a routing path of the high voltage cable.
Optionally, the electromagnetic compatibility equivalent circuit model includes: the system comprises a traction substation equivalent circuit, a contact net equivalent circuit, a high-voltage system equivalent circuit and a grounding system equivalent circuit.
Optionally, the high-voltage system equivalent circuit at least includes:
a pantograph, a vacuum circuit breaker VCB and a high-voltage disconnector.
Optionally, the equivalent circuit of the grounding system includes: a working grounding system and a protection grounding system.
Optionally, the interference coupling path of the vehicle body overvoltage is specifically:
the VCB is switched off to cause a current interception phenomenon, and overvoltage is generated;
the overvoltage is coupled to the high-voltage cable shielding layer through a capacitor between the high-voltage cable core wire and the high-voltage cable shielding layer;
the high voltage cable shielding layer is connected with the vehicle body, and the overvoltage is coupled to the vehicle body to cause overvoltage of the vehicle body.
Optionally, the step of establishing a vehicle overvoltage analysis model by combining the vehicle three-dimensional model, the high-voltage cable three-dimensional model and the electromagnetic compatibility equivalent circuit model according to the interference coupling path of the vehicle overvoltage specifically includes:
respectively leading out a plurality of core wire ports and a plurality of shielding layer ports from the high-voltage cable three-dimensional model according to an interference coupling path of the overvoltage of the vehicle body; the high-voltage cable three-dimensional model comprises the high-voltage cable core wire and the high-voltage cable shielding layer; the plurality of core wire ports are led out from the high-voltage cable core wires, and the plurality of shielding layer ports are led out from the high-voltage cable shielding layer;
leading out a first port and a second port from the three-dimensional model of the vehicle body;
leading out a grounding port from the grounding system equivalent circuit;
connecting the first port of the three-dimensional model of the vehicle body with the ports of the shielding layers, and connecting the ports of the shielding layers and carrying out grounding treatment;
connecting the second port of the three-dimensional model of the vehicle body to the ground port;
and connecting the core wire ports, and connecting the high-voltage cable three-dimensional model with the electromagnetic compatibility equivalent circuit model through the core wire ports to obtain a vehicle body overvoltage analysis model.
Optionally, according to the vehicle overvoltage analysis model, overvoltage analysis is performed on the position to be detected on the vehicle three-dimensional model to obtain an overvoltage analysis result, and the overvoltage analysis result specifically includes:
and leading out a third port from the position to be detected on the three-dimensional model of the vehicle body, and analyzing the overvoltage of the third port by combining the overvoltage analysis model of the vehicle body to obtain an overvoltage analysis result.
In a second aspect, an embodiment of the present application provides a vehicle body overvoltage analysis device, where the device includes:
the interference coupling path acquisition module is used for acquiring an interference coupling path of the overvoltage of the vehicle body;
the vehicle body three-dimensional model establishing module is used for establishing a vehicle body three-dimensional model according to the first parameters of the vehicle body;
the high-voltage cable three-dimensional model establishing module is used for establishing a high-voltage cable three-dimensional model according to the second parameter of the high-voltage cable;
the electromagnetic compatibility equivalent circuit model building module is used for building an electromagnetic compatibility equivalent circuit model for train power supply;
the vehicle body overvoltage analysis model establishing module is used for establishing a vehicle body overvoltage analysis model by combining the vehicle body three-dimensional model, the high-voltage cable three-dimensional model and the electromagnetic compatibility equivalent circuit model according to an interference coupling path of the vehicle body overvoltage;
and the vehicle body overvoltage analysis module is used for carrying out overvoltage analysis on the position to be detected on the vehicle body three-dimensional model to obtain an overvoltage analysis result.
According to the technical scheme, the method has the following beneficial effects:
the embodiment of the application provides a vehicle body overvoltage analysis method, which comprises the following steps: first, a disturbance coupling path of the vehicle body overvoltage is obtained. Secondly, a three-dimensional model of the train body is established according to the first parameters of the train body, a three-dimensional model of the high-voltage cable is established according to the second parameters of the high-voltage cable, and an electromagnetic compatibility equivalent circuit model of the train power supply is established. And establishing a vehicle body overvoltage analysis model by combining a vehicle body three-dimensional model, a high-voltage cable three-dimensional model and an electromagnetic compatibility equivalent circuit model according to an interference coupling path of the vehicle body overvoltage. And finally, performing overvoltage analysis on the position to be detected on the three-dimensional model of the vehicle body according to the overvoltage analysis model of the vehicle body to obtain an overvoltage analysis result. According to the embodiment of the application, the vehicle body three-dimensional model, the high-voltage cable three-dimensional model and the electromagnetic compatibility equivalent circuit model are built, and the vehicle body three-dimensional model and the high-voltage cable three-dimensional model are embedded into the electromagnetic compatibility equivalent circuit model, so that a vehicle body overvoltage analysis model is obtained. Based on the overvoltage analysis method, the overvoltage of the position to be detected on the three-dimensional model of the vehicle body can be analyzed by combining the overvoltage analysis model of the vehicle body, so that the specific position of the overvoltage on the vehicle body can be accurately analyzed.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a train body overvoltage analysis method provided in an embodiment of the present application;
FIG. 2 is a schematic diagram of a three-dimensional model of a vehicle body and a three-dimensional model of a high-voltage cable according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a port arrangement of a three-dimensional model of a vehicle body according to an embodiment of the present application;
FIG. 4 is a vehicle overvoltage analysis model provided in an embodiment of the present application;
fig. 5 is a schematic diagram of an overvoltage analysis device for a train body according to an embodiment of the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the drawings are described in detail below.
In order to facilitate understanding and explaining the technical solutions provided by the embodiments of the present application, the following first describes the background art of the embodiments of the present application.
In the running process of a high-speed train and a motor train unit, various electrical equipment in the train bears various overvoltage besides normal working voltage. For example, when a high-speed train motor train unit is in a lifting bow and passing neutral section, the VCB can be operated, and overvoltage can be generated on a train body when the VCB is operated. When the value of the overvoltage exceeds the working voltage, the electric equipment can be caused to break down, and the normal operation of the motor train unit is influenced.
To reduce the occurrence of overvoltage conditions, prior to the construction of the train body, the overvoltage conditions of the train body are typically analyzed and predicted to evaluate the overvoltage performance of the train body. At present, in the prior art, a circuit model is adopted for modeling in the research on the overvoltage of the vehicle body. In the process of modeling by using a circuit, a high-voltage cable is equivalent to a distributed parameter model, and a vehicle body is equivalent to a four-side impedance, but the specific position of overvoltage on the vehicle body cannot be accurately analyzed by the circuit model.
Based on this, the embodiment of the application provides a train body overvoltage analysis method, and the method includes:
and obtaining an interference coupling path of the overvoltage of the vehicle body. And establishing a three-dimensional model of the vehicle body according to the first parameters of the vehicle body. And establishing a three-dimensional model of the high-voltage cable according to the second parameter of the high-voltage cable. And establishing an electromagnetic compatibility equivalent circuit model for train power supply. And establishing a vehicle body overvoltage analysis model by combining a vehicle body three-dimensional model, a high-voltage cable three-dimensional model and an electromagnetic compatibility equivalent circuit model according to an interference coupling path of the vehicle body overvoltage. And carrying out overvoltage analysis on the position to be detected on the three-dimensional model of the vehicle body according to the overvoltage analysis model of the vehicle body to obtain an overvoltage analysis result. According to the embodiment of the application, the vehicle body three-dimensional model, the high-voltage cable three-dimensional model and the electromagnetic compatibility equivalent circuit model are built, and the vehicle body three-dimensional model and the high-voltage cable three-dimensional model are embedded into the electromagnetic compatibility equivalent circuit model to obtain the vehicle body overvoltage analysis model. Based on the overvoltage analysis method, the overvoltage of the position to be detected on the three-dimensional model of the vehicle body can be analyzed by combining the overvoltage analysis model of the vehicle body, so that the specific position of the overvoltage on the vehicle body can be accurately analyzed.
In order to facilitate understanding of the technical solutions provided in the embodiments of the present application, the following describes a train body overvoltage analysis method provided in the embodiments of the present application with reference to the accompanying drawings.
Method embodiment
Referring to fig. 1, fig. 1 is a flowchart of a train body overvoltage analysis method provided in an embodiment of the present application, where the method may include S101 to S106:
s101: and obtaining an interference coupling path of the overvoltage of the vehicle body.
When the train is passing the neutral section, the VCB needs to be disconnected because the neutral section cannot be loaded. The train operator must disconnect the traction motors on the train before disconnecting the VCB. When the traction motor does not work, a traction main transformer in the train is in an idle state. In this case, the traction main transformer acts as an inductive load, and switching off the VCB generates a vehicle body overvoltage. The interference coupling path for generating the vehicle body overvoltage is specifically as follows:
the VCB is switched off to cause a current interception phenomenon and generate overvoltage;
the overvoltage is coupled to the high-voltage cable shielding layer through the distributed capacitance between the high-voltage cable core wire and the high-voltage cable shielding layer;
the high voltage cable shielding layer is connected with the vehicle body, and overvoltage is coupled to the vehicle body to cause overvoltage of the vehicle body.
It should be noted that before the VCB is switched off, the traction main transformer acts as an inductive load, and when the VCB is switched off, the current blocking phenomenon is caused.
S102: and establishing a three-dimensional model of the vehicle body according to the first parameters of the vehicle body.
The first parameter of the vehicle body is the actual size and material of the vehicle body. And establishing a three-dimensional model of the vehicle body according to the actual size and material of the vehicle body.
The vehicle body may be made of aluminum alloy, carbon steel, carbon fiber, or the like. The material of the vehicle body can affect the shielding effect of the vehicle body. The material of the car body affects the magnitude of the over-voltage coupled to the car body when the VCB is turned off.
S103: and establishing a three-dimensional model of the high-voltage cable according to the second parameter of the high-voltage cable.
The second parameter of the high-voltage cable is the actual size and routing path of the high-voltage cable. And establishing a three-dimensional model of the high-voltage cable according to the actual size and the wiring path of the high-voltage cable.
As shown in fig. 2, fig. 2 is a schematic view of a three-dimensional model of a vehicle body and a three-dimensional model of a high-voltage cable according to an embodiment of the present application. The high-voltage cable three-dimensional model is attached to the vehicle body three-dimensional model. The routing condition of the high-voltage cable in the vehicle body can be seen from the high-voltage cable three-dimensional model in fig. 2. It can be understood that the routing of the high voltage cable can affect the magnitude and distribution of the overvoltage of the vehicle body on the vehicle body.
S104: and establishing an electromagnetic compatibility equivalent circuit model for train power supply.
And establishing an electromagnetic compatibility equivalent circuit model for train power supply. In this embodiment, the electromagnetic compatibility equivalent circuit model includes: the system comprises a traction substation equivalent circuit, a contact net equivalent circuit, a high-voltage system equivalent circuit and a grounding system equivalent circuit.
The traction substation is a device which converts three-phase high-voltage alternating current into two single-phase alternating currents and supplies power to overhead contact networks in two directions of ascending and descending of the train. The overhead contact system is a power transmission line which is erected along the overhead of the train track and used for supplying power to the train by current-taking of the pantograph.
The high-pressure system comprises at least: a pantograph, a VCB and a high-voltage disconnector. Wherein, the pantograph is the train and gets the electrical equipment of electric energy from the contact network. The high-voltage isolating switch controls the high-voltage cable to be connected, and when a fault occurs, the high-voltage isolating switch is disconnected, and power supply between the vehicle bodies is isolated.
The grounding system comprises a working grounding system and a protection grounding system. The high-speed train motor train unit is formed by marshalling a motor train unit and a trailer. Wherein, the vehicle body providing power is called a motor car, and the vehicle body not providing power is called a trailer. In some embodiments of the present embodiment, the trailer grounding mode is a protective grounding mode, and the bullet train grounding mode is a working grounding mode and a protective grounding mode. In other embodiments of this embodiment, the trailer is not grounded, and the ground mode of the motor train is working ground and protective ground. In practical application, the vehicle body is grounded by means of the vehicle axle end. The grounding method of the vehicle body is not limited to the above-described embodiment, and different grounding methods may be used. It can be understood that different grounding modes affect the magnitude of the vehicle body overvoltage, and the more the vehicle axle end of the vehicle body is grounded, that is, the more grounding systems of the vehicle body are, the faster the vehicle body overvoltage is released through the grounding systems.
S105: and establishing a vehicle body overvoltage analysis model by combining a vehicle body three-dimensional model, a high-voltage cable three-dimensional model and an electromagnetic compatibility equivalent circuit model according to an interference coupling path of the vehicle body overvoltage.
After the interference coupling path of the vehicle body overvoltage is analyzed, a vehicle body three-dimensional model, a high-voltage cable three-dimensional model and an electromagnetic compatibility equivalent circuit model are connected through ports according to the interference coupling path of the vehicle body overvoltage, and a vehicle body overvoltage analysis model is established.
During specific implementation, a plurality of core wire ports and a plurality of shielding layer ports are respectively led out from the high-voltage cable three-dimensional model according to an interference coupling path of overvoltage of a vehicle body. The high-voltage cable three-dimensional model comprises a high-voltage cable core wire and a high-voltage cable shielding layer. The ports of the core wires are led out from the core wires of the high-voltage cable, and the ports of the shielding layers are led out from the shielding layers of the high-voltage cable.
And leading out a first port and a second port from the three-dimensional model of the vehicle body. As shown in fig. 3, fig. 3 is a schematic view of port arrangement of a three-dimensional model of a vehicle body according to an embodiment of the present application. In specific implementation, the first port is an upper port of the vehicle body, and the second port is a lower port of the vehicle body.
And a grounding port is led out from the equivalent circuit of the grounding system. During specific implementation, one grounding port is led out from one group of grounding systems, and the one group of grounding systems corresponds to one section of the vehicle body. For example, the working and protective grounding systems of 2 cars constitute a set of grounding systems.
And connecting the first port of the three-dimensional model of the vehicle body with the ports of the shielding layers, and connecting the ports of the shielding layers and carrying out grounding treatment.
And connecting the second port of the three-dimensional model of the vehicle body with the grounding port.
And connecting a plurality of core wire ports, and connecting the high-voltage cable three-dimensional model with the electromagnetic compatibility equivalent circuit model through the core wire ports to obtain a vehicle body overvoltage analysis model.
S106: and carrying out overvoltage analysis on the position to be detected on the three-dimensional model of the vehicle body according to the overvoltage analysis model of the vehicle body to obtain an overvoltage analysis result.
During specific implementation, a third port is led out from a position to be detected on the three-dimensional model of the vehicle body, the VCB is switched off, the overvoltage of the third port is measured by combining the overvoltage analysis model of the vehicle body, and the overvoltage analysis result of the position to be detected is obtained and analyzed. The overvoltage analysis result of the position to be detected comprises an overvoltage amplitude of the position to be detected, the oscillation duration of the overvoltage of the position to be detected and the oscillation frequency of the overvoltage of the position to be detected.
It should be noted that the position to be detected may be any position on the vehicle body.
It should be further noted that the basic characteristics of the train body overvoltage are as follows: the peak value of the overvoltage of the vehicle body can reach kilovolt magnitude, the oscillation duration of the overvoltage of the vehicle body is about tens of microseconds, and the oscillation frequency of the overvoltage of the vehicle body is about one megahertz. If the overvoltage analysis result of the position to be detected accords with the basic characteristic of the overvoltage of the train body, the technical scheme provided by the embodiment of the application can accurately analyze the specific position of the overvoltage on the train body.
In some embodiments of the present embodiment, the operation of disconnecting the VCB is performed when the train supply voltage is at an amplitude. At the moment, the worst condition of the over-voltage of the train body caused by the VCB disconnection can be simulated in the actual running process of the motor train unit train.
According to the technical scheme provided by the embodiment of the application, firstly, an interference coupling path of the overvoltage of the vehicle body is obtained. Secondly, a three-dimensional model of the train body is established according to the first parameters of the train body, a three-dimensional model of the high-voltage cable is established according to the second parameters of the high-voltage cable, and an electromagnetic compatibility equivalent circuit model of the train power supply is established. And establishing a vehicle body overvoltage analysis model by combining a vehicle body three-dimensional model, a high-voltage cable three-dimensional model and an electromagnetic compatibility equivalent circuit model according to an interference coupling path of the vehicle body overvoltage. And finally, performing overvoltage analysis on the position to be detected on the three-dimensional model of the vehicle body according to the overvoltage analysis model of the vehicle body to obtain an overvoltage analysis result. According to the embodiment of the application, the vehicle body three-dimensional model, the high-voltage cable three-dimensional model and the electromagnetic compatibility equivalent circuit model are built, and the vehicle body three-dimensional model and the high-voltage cable three-dimensional model are embedded into the electromagnetic compatibility equivalent circuit model, so that a vehicle body overvoltage analysis model is obtained. Based on the overvoltage analysis method, the overvoltage at the position to be detected on the three-dimensional model of the vehicle body can be analyzed by combining the overvoltage analysis model of the vehicle body, so that the overvoltage analysis result at the position to be detected is obtained, and the specific position of the overvoltage on the vehicle body can be accurately analyzed.
In order to facilitate a clear understanding of the embodiments of the present invention for those skilled in the art, a description of the embodiments of the present invention is given below by way of a specific example. It should be noted that the specific example is only for making the present invention more clearly understood by those skilled in the art, but the embodiments of the present invention are not limited to the specific example, and in practical applications, the embodiments may be adjusted according to actual situations.
Referring to fig. 4, fig. 4 is a vehicle overvoltage analysis model provided in the embodiment of the present application, where the vehicle overvoltage analysis model is obtained by embedding a vehicle three-dimensional model and a high-voltage cable three-dimensional model into an electromagnetic compatibility equivalent circuit model.
In concrete implementation, obtaining an interference coupling path of the vehicle body overvoltage, and analyzing to obtain the interference coupling path of the vehicle body overvoltage as follows: switching the VCB off causes a current blocking phenomenon, resulting in an overvoltage. The generated overvoltage is coupled to the high-voltage cable shielding layer through the distributed capacitance between the high-voltage cable core wire and the high-voltage cable shielding layer. The high voltage cable shielding layer is connected with the vehicle body, and overvoltage is coupled to the vehicle body to cause overvoltage of the vehicle body.
On one hand, the vehicle body is subjected to materialization modeling according to the actual size and material of the vehicle body, and the distribution parameters of capacitance, inductance, resistance and the like of each part of the vehicle body, so as to establish a three-dimensional model of the vehicle body. According to the actual size and the wiring path of the high-voltage cable and the distribution parameters of capacitance, inductance, resistance and the like of each part of the high-voltage cable, the high-voltage cable is subjected to materialized modeling, and a three-dimensional model of the high-voltage cable is established. As shown in fig. 4, assuming that the train of the motor train unit has 8 cars, there are 8 train bodies in total, which are referred to as 1 train to 8 trains. Wherein, 1 car and 8 are trailers, 2 cars to 7 cars are motor cars, transformers are arranged in 3 cars and 6 cars, the transformers in 3 cars supply power for 2 cars and 4 cars, and the transformers in 6 cars supply power for 5 cars and 7 cars. And establishing a three-dimensional model of the vehicle body from the vehicle 1 to the vehicle 8, wherein the high-voltage cable is arranged on the vehicle 3 to the vehicle 6, and the three-dimensional model of the high-voltage cable is attached to the three-dimensional model of the vehicle body from the vehicle 3 to the vehicle 6.
It should be noted that, changing the material of the vehicle body, routing of the high-voltage cable, etc. all affect the distribution parameters of the capacitor, the inductor, the resistor, etc. thereof, and further affect the distribution position and the magnitude of the overvoltage of the vehicle body.
And on the other hand, establishing an electromagnetic compatibility equivalent circuit model for train power supply. Specifically, the electromagnetic compatibility equivalent circuit model comprises a traction substation equivalent circuit, a contact network equivalent circuit, a high-voltage system equivalent circuit and a grounding system equivalent circuit. The high-voltage system equivalent circuit comprises a pantograph, a VCB, a high-voltage isolating switch and the like. The equivalent circuit of the traction substation outputs 25kV power to the contact network, and the contact network supplies power to the train body through a pantograph (not shown in the figure) on the train body. As the vehicles 1 and 8 are trailers, the grounding modes of the vehicles 1 and 8 are both protected and grounded. As the 2 to 7 vehicles are motor cars, the grounding modes of the 2 to 7 vehicles are working grounding and protective grounding.
Further, a vehicle body overvoltage analysis model is established by combining the vehicle body three-dimensional model, the high-voltage cable three-dimensional model and the electromagnetic compatibility equivalent circuit model according to an interference coupling path of the vehicle body overvoltage.
Specifically, since the interference coupling path of the over-voltage of the vehicle body is related to the high-voltage cable core wire and the high-voltage cable shielding layer, the coupling path of the over-voltage of the vehicle body on the high-voltage cable core wire and the high-voltage cable shielding layer is simulated, a plurality of core wire ports are led out from the high-voltage cable core wire three-dimensional model, and a plurality of shielding layer ports are led out from the high-voltage cable shielding layer three-dimensional model. As shown in fig. 4, a core port (the core port is denoted by "xx" in the drawing) and a shield port (the shield port is denoted by "pb" in the drawing) are led out from the high-voltage cable core and the high-voltage cable shield, respectively.
And leading out a first port and a second port from the three-dimensional model of the vehicle body. Since the 3-6 cars are provided with high-voltage cables, first ports (not shown in the figure) are led out from the three-dimensional models of the 3-6 cars. As shown in fig. 4, the second port is led out from the cart 1 to the cart 8 (the second port is marked with "2" in the figure). And a grounding port is led out from equivalent circuits of grounding systems of vehicles 1 to 8.
And respectively connecting the first ports on the three-dimensional models of the bodies of the 3-6 cars with the ports of the shielding layers of the high-voltage cables, and connecting all the ports of the shielding layers and carrying out grounding treatment. And connecting the second ports of the three-dimensional models of the bodies of the 1-8 vehicles with the corresponding grounding ports of the grounding system.
As shown in fig. 4, a core wire port of the three-dimensional model of the high-voltage cable in the 3 cars is connected with a port (a port between the VCB and the high-voltage isolating switch) in the electromagnetic compatibility equivalent circuit model, a port led out from the transformer in the 3 cars is connected with a core wire port of the three-dimensional model of the high-voltage cable in the 4 cars, core wire ports of the three-dimensional models of the high-voltage cable in the 4 cars to the 6 cars are sequentially connected, and a core wire port of the three-dimensional model of the high-voltage cable in the 6 cars and a port led out from the. Therefore, the high-voltage cable three-dimensional model is connected with the electromagnetic compatibility equivalent circuit model to obtain a vehicle body overvoltage analysis model.
Finally, as shown in fig. 4, a port of the position to be detected is led out from the three-dimensional model of the vehicle body of the 1-8 vehicles (the port of the position to be detected is marked with "3" in the figure). In one implementation manner of this embodiment, when the supply voltage of the train of the motor train unit is at a peak value, the VCB is disconnected, and the overvoltage of the port at the position to be detected on the three-dimensional model of the train body is measured in combination with the obtained over-voltage analysis model of the train body, so as to obtain the over-voltage amplitude, the over-voltage duration and the over-voltage oscillation frequency of the position to be detected. It should be noted that the position to be detected may be any position on the three-dimensional model of the vehicle body.
It can be understood that if the train of the motor train unit has 16 cars, 1 car to 8 cars form a group, and 9 cars to 16 cars form a group. After the overvoltage distribution condition of 1 vehicle to 8 vehicles is measured, the overvoltage distribution condition of 9 vehicles to 16 vehicles does not need to be repeatedly measured, namely, the arrangement of the grounding system and the high-voltage cable routing of the 9 vehicles to 16 vehicles is the same as that of the 1 vehicle to 8 vehicles.
According to the technical scheme provided by the embodiment of the application, the train body three-dimensional model, the high-voltage cable three-dimensional model and the train power supply electromagnetic compatibility equivalent circuit model of the train are established by analyzing the interference coupling path of the train body overvoltage, the train body three-dimensional model and the high-voltage cable three-dimensional model are embedded into the electromagnetic compatibility equivalent circuit model, the overvoltage measurement is carried out on the position to be detected in the train body three-dimensional model, and the overvoltage analysis result of the position to be detected of the train body is obtained. The specific position of the overvoltage of the vehicle body can be accurately analyzed and obtained due to the fact that the position to be detected on the three-dimensional model of the vehicle body is arbitrary.
Device embodiment
Referring to fig. 5, fig. 5 is a schematic diagram of a train body overvoltage analysis device provided in an embodiment of the present application. The apparatus may specifically include:
an interference coupling path obtaining module 501, configured to obtain an interference coupling path of the vehicle body overvoltage;
a vehicle body three-dimensional model establishing module 502, configured to establish a vehicle body three-dimensional model according to the first parameter of the vehicle body;
a high-voltage cable three-dimensional model establishing module 503, configured to establish a high-voltage cable three-dimensional model according to a second parameter of the high-voltage cable;
an electromagnetic compatibility equivalent circuit model establishing module 504, configured to establish an electromagnetic compatibility equivalent circuit model for train power supply;
a vehicle overvoltage analysis model establishing module 505, configured to establish a vehicle overvoltage analysis model according to an interference coupling path of the vehicle overvoltage, in combination with the vehicle three-dimensional model, the high-voltage cable three-dimensional model, and the electromagnetic compatibility equivalent circuit model;
and the vehicle body overvoltage analysis module 506 is used for performing overvoltage analysis on the position to be detected on the vehicle body three-dimensional model to obtain an overvoltage analysis result.
Optionally, in some embodiments of this embodiment, the first parameter is an actual size and material of the vehicle body.
Optionally, in some embodiments of this embodiment, the second parameter is an actual size and a routing path of the high voltage cable.
Optionally, in some implementations of this embodiment, the electromagnetic compatibility equivalent circuit model at least includes: the system comprises a traction substation equivalent circuit, a contact net equivalent circuit, a high-voltage system equivalent circuit and a grounding system equivalent circuit.
Optionally, in some embodiments of this embodiment, the high-voltage system equivalent circuit at least includes:
a pantograph, a vacuum circuit breaker VCB and a high-voltage disconnector.
Optionally, in some implementations of this embodiment, the equivalent circuit of the grounding system includes: a working grounding system and a protection grounding system.
Optionally, in some embodiments of this embodiment, the interference coupling path of the vehicle body overvoltage is specifically:
the VCB is switched off to cause a current interception phenomenon, and overvoltage is generated;
the overvoltage is coupled to the high-voltage cable shielding layer through a capacitor between the high-voltage cable core wire and the high-voltage cable shielding layer;
the high voltage cable shielding layer is connected with the vehicle body, and the overvoltage is coupled to the vehicle body to cause overvoltage of the vehicle body.
Optionally, in some embodiments of this embodiment, the establishing a vehicle overvoltage analysis model according to the interference coupling path of the vehicle overvoltage by combining the vehicle three-dimensional model, the high-voltage cable three-dimensional model, and the electromagnetic compatibility equivalent circuit model specifically includes:
respectively leading out a plurality of core wire ports and a plurality of shielding layer ports from the high-voltage cable three-dimensional model according to an interference coupling path of the overvoltage of the vehicle body; the high-voltage cable three-dimensional model comprises the high-voltage cable core wire and the high-voltage cable shielding layer; the plurality of core wire ports are led out from the high-voltage cable core wires, and the plurality of shielding layer ports are led out from the high-voltage cable shielding layer;
leading out a first port and a second port from the three-dimensional model of the vehicle body;
leading out a grounding port from the grounding system equivalent circuit;
connecting the first port of the three-dimensional model of the vehicle body with the ports of the shielding layers, and connecting the ports of the shielding layers and carrying out grounding treatment;
connecting the second port of the three-dimensional model of the vehicle body to the ground port;
and connecting the core wire ports, and connecting the high-voltage cable three-dimensional model with the electromagnetic compatibility equivalent circuit model through the core wire ports to obtain a vehicle body overvoltage analysis model.
Optionally, in some embodiments of this embodiment, according to the vehicle overvoltage analysis model, overvoltage analysis is performed on the position to be detected on the three-dimensional vehicle body model to obtain an overvoltage analysis result, which specifically includes:
and leading out a third port from the position to be detected on the three-dimensional model of the vehicle body, and analyzing the overvoltage of the third port by combining the overvoltage analysis model of the vehicle body to obtain an overvoltage analysis result.
According to the technical scheme provided by the embodiment of the application, the interference coupling path of the overvoltage of the vehicle body is obtained by the interference coupling path obtaining module. And establishing a three-dimensional model of the vehicle body by a vehicle body three-dimensional model establishing module. And establishing a high-voltage cable three-dimensional model by using a high-voltage cable three-dimensional model establishing module. And establishing an electromagnetic compatibility equivalent circuit model for the power supply of the train by an electromagnetic compatibility equivalent circuit model establishing module. And establishing a vehicle body overvoltage analysis model by a vehicle body overvoltage analysis model establishing module. And the overvoltage analysis module of the vehicle body is used for carrying out overvoltage analysis on the position to be detected on the three-dimensional model of the vehicle body to obtain an overvoltage analysis result. According to the embodiment of the application, the vehicle body three-dimensional model, the high-voltage cable three-dimensional model and the electromagnetic compatibility equivalent circuit model are built, and the vehicle body three-dimensional model and the high-voltage cable three-dimensional model are embedded into the electromagnetic compatibility equivalent circuit model, so that a vehicle body overvoltage analysis model is obtained. Based on the overvoltage analysis method, the overvoltage at the position to be detected on the three-dimensional model of the vehicle body can be analyzed by combining the overvoltage analysis model of the vehicle body, so that the overvoltage analysis result at the position to be detected is obtained, and the specific position of the overvoltage on the vehicle body can be accurately analyzed.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The method disclosed by the embodiment corresponds to the system disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the system part for description.
It should also be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A train body overvoltage analysis method is characterized by comprising the following steps:
obtaining an interference coupling path of the vehicle body overvoltage;
establishing a three-dimensional model of the vehicle body according to the first parameter of the vehicle body;
establishing a high-voltage cable three-dimensional model according to the second parameter of the high-voltage cable;
establishing an electromagnetic compatibility equivalent circuit model for train power supply;
according to the interference coupling path of the vehicle body overvoltage, a vehicle body overvoltage analysis model is established by combining the vehicle body three-dimensional model, the high-voltage cable three-dimensional model and the electromagnetic compatibility equivalent circuit model;
and performing overvoltage analysis on the position to be detected on the three-dimensional model of the vehicle body according to the overvoltage analysis model of the vehicle body to obtain an overvoltage analysis result.
2. The method of claim 1, wherein the first parameter is the actual size and material of the vehicle body.
3. The method of claim 1, wherein the second parameter is an actual size and routing path of the high voltage cable.
4. The method of claim 1, wherein the electromagnetic compatibility equivalent circuit model comprises: the system comprises a traction substation equivalent circuit, a contact net equivalent circuit, a high-voltage system equivalent circuit and a grounding system equivalent circuit.
5. The method according to claim 4, characterized in that the high-voltage system equivalent circuit comprises at least:
a pantograph, a vacuum circuit breaker VCB and a high-voltage disconnector.
6. The method of claim 4, wherein the ground system equivalent circuit comprises: a working grounding system and a protection grounding system.
7. The method according to claim 5, characterized in that the disturbance coupling path of the vehicle body overvoltage is embodied as:
the VCB is switched off to cause a current interception phenomenon, and overvoltage is generated;
the overvoltage is coupled to the high-voltage cable shielding layer through a capacitor between the high-voltage cable core wire and the high-voltage cable shielding layer;
the high voltage cable shielding layer is connected with the vehicle body, and the overvoltage is coupled to the vehicle body to cause overvoltage of the vehicle body.
8. The method according to claim 7, wherein the interference coupling path according to the vehicle body overvoltage is combined with the three-dimensional vehicle body model, the three-dimensional high-voltage cable model and the electromagnetic compatibility equivalent circuit model to establish a vehicle body overvoltage analysis model, specifically:
respectively leading out a plurality of core wire ports and a plurality of shielding layer ports from the high-voltage cable three-dimensional model according to an interference coupling path of the overvoltage of the vehicle body; the high-voltage cable three-dimensional model comprises the high-voltage cable core wire and the high-voltage cable shielding layer; the plurality of core wire ports are led out from the high-voltage cable core wires, and the plurality of shielding layer ports are led out from the high-voltage cable shielding layer;
leading out a first port and a second port from the three-dimensional model of the vehicle body;
leading out a grounding port from the grounding system equivalent circuit;
connecting the first port of the three-dimensional model of the vehicle body with the ports of the shielding layers, and connecting the ports of the shielding layers and carrying out grounding treatment;
connecting the second port of the three-dimensional model of the vehicle body to the ground port;
and connecting the core wire ports, and connecting the high-voltage cable three-dimensional model with the electromagnetic compatibility equivalent circuit model through the core wire ports to obtain a vehicle body overvoltage analysis model.
9. The method according to claim 1, wherein the overvoltage analysis is performed on the position to be detected on the three-dimensional model of the vehicle body according to the overvoltage analysis model of the vehicle body to obtain an overvoltage analysis result, and specifically comprises:
and leading out a third port from the position to be detected on the three-dimensional model of the vehicle body, and analyzing the overvoltage of the third port by combining the overvoltage analysis model of the vehicle body to obtain an overvoltage analysis result.
10. A vehicle body overvoltage analysis device, characterized in that the system comprises:
the interference coupling path acquisition module is used for acquiring an interference coupling path of the overvoltage of the vehicle body;
the vehicle body three-dimensional model establishing module is used for establishing a vehicle body three-dimensional model according to the first parameters of the vehicle body;
the high-voltage cable three-dimensional model establishing module is used for establishing a high-voltage cable three-dimensional model according to the second parameter of the high-voltage cable;
the electromagnetic compatibility equivalent circuit model building module is used for building an electromagnetic compatibility equivalent circuit model for train power supply;
the vehicle body overvoltage analysis model establishing module is used for establishing a vehicle body overvoltage analysis model by combining the vehicle body three-dimensional model, the high-voltage cable three-dimensional model and the electromagnetic compatibility equivalent circuit model according to an interference coupling path of the vehicle body overvoltage;
and the vehicle body overvoltage analysis module is used for carrying out overvoltage analysis on the position to be detected on the vehicle body three-dimensional model to obtain an overvoltage analysis result.
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| CN115432033A (en) * | 2022-09-23 | 2022-12-06 | 西南交通大学 | Secondary side overvoltage protection method suitable for traction transformer under multi-vehicle common arm |
| CN115432033B (en) * | 2022-09-23 | 2023-10-27 | 西南交通大学 | Traction transformer secondary side overvoltage protection method suitable for multi-vehicle common arm |
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