Contact network icing operation stability evaluation method considering water drop collision coefficient

Abstract

The invention provides a contact network icing operation stability evaluation method considering a water drop collision coefficient, and the method is characterized in that a contact network icing test platform considering the water drop collision coefficient is built; the method for evaluating the icing operation stability of the contact network comprises the following steps of: setting the wind speed and the water drop diameter in a test box and the line voltage of a lead on an upper computer, and changing the wind speed and the water drop diameter in the test box and the line voltage of the lead, which are set on the upper computer; identifying and measuring an area enclosed by water drops on a release plane and an area enclosed by water drops impacting the surface of the overhead line system through a high-definition camera so as to obtain an important index, namely a water drop collision coefficient, for measuring the water drop capturing capability of the overhead line system, and repeating the steps to obtain m groups of icing thickness parameter data of the test overhead line system; and calculating a theoretical value of the icing thickness parameter of the contact network, optimizing a theoretical calculation formula of the icing thickness parameter of the contact network, and finally calculating an evaluation factor of the icing operation stability of the contact network and evaluating the icing operation stability of the contact network.

Description

Technical Field

[0001] The invention relates to the field of catenary operation stability assessment, and in particular to a method for assessing catenary operation stability with ice coverage taking into account a water drop collision coefficient. Background Art

[0002] With the continuous improvement of the high-speed rail network and the continuous improvement of the operation level, the performance and status of the contact network, as a key component of the high-speed rail traction power supply system, directly affect the operating efficiency of the high-speed rail train. In recent years, due to the frequent occurrence of extreme cold weather, the icing of the contact network will seriously affect its conductive performance, resulting in poor contact between the train pantograph and the contact network, and even power outages, short circuits, sparks and other phenomena. This will not only damage the contact network and pantograph, but may also cause damage to the train's power system, causing the train to stop operating or accidents. Therefore, it is very necessary to evaluate the stability of the contact network under icing.

[0003] At present, although there are a variety of contact network risk assessment methods, these methods have some defects and shortcomings and have not been widely promoted and applied. For example, most traditional assessment methods are based on empirical models or physical models, and fail to fully consider the dynamic factors in the actual environment, such as the impact of wind speed, electric field and rainfall on the contact network icing process. In addition, these methods often lack accurate calculation and real-time monitoring of key parameters, resulting in insufficient accuracy and reliability of the assessment results. In response to the above problems, the present invention provides a contact network icing operation stability assessment method considering the water droplet collision coefficient, which analyzes and evaluates the contact network icing operation stability considering different wind speeds, electric fields and rainfall diameters in the actual ambient air, providing important support for the stability and reliability of the high-speed rail system. Summary of the invention

[0004] In order to more accurately analyze and evaluate the stability of the catenary's ice-covered operation, the present invention provides a method for evaluating the stability of the catenary's ice-covered operation taking into account the water drop collision coefficient. The technical solution for achieving the purpose of the present invention is as follows:

[0005] First, a test platform is built, which includes: a host computer (1), a working voltage generation controller (2), a working voltage generator (3), a switch (4), a high-voltage cable (9), a rainfall simulation device (5), a high-definition intelligent monitoring and measurement integrated device (6), a contact network model (7), a duct system (8), a test box (10), a data acquisition device (11), and a comprehensive grounding device (12);

[0006] The bottom grounding end of the contact network model (7) is connected to the integrated grounding device (12), and the contact network model (7) is placed inside the test box (10);

[0007] The trigger interface of the working voltage generation controller (2) is connected to the input end of the working voltage generator (3), the host computer (1) is connected to the control end of the working voltage generation controller (2), the output end of the working voltage generator (3) is connected to the input end of the switch (4) through a high-voltage cable (9), and the output end of the switch (4) is connected to the input end of the contact network model (7);

[0008] The simulated rainfall device (5), the high-definition intelligent monitoring and measurement integrated device (6), and the air duct system (8) are fixed inside the test box;

[0009] The host computer (1) is connected to the rainfall simulation device (5) and the air duct system (8);

[0010] The high-definition intelligent monitoring and measurement integrated device (6) is connected to the input end of the data acquisition device (11), and the output end of the data acquisition device (11) is connected to the host computer (1);

[0011] The evaluation method of the above evaluation platform comprises the following steps:

[0012] The first step: closing the switch (4), sending wind speed, raindrop diameter, and voltage setting signals to the air duct system (8), the simulated rainfall device (5), and the working voltage generation controller (2) through the host computer (1), respectively. The air duct system (8), the simulated rainfall device (5), and the working voltage generation controller (2) execute corresponding instructions, and the high-definition intelligent monitoring and measurement integrated device (6) identifies the area S0 surrounded by the water droplets released on the ground and the area S surrounded by the water droplets hitting the contact network surface in the measurement test box, and transmits the water drop collision coefficient γ to the host computer (1) through the data acquisition device (11);

[0013] Continue to monitor the icing condition of the contact network model (7) through the high-definition intelligent monitoring and measurement integrated device (6), and transmit the icing condition to the host computer (1) through the data acquisition device (11);

[0014] Adjust the switch to disconnect it, change the wind speed v, raindrop diameter d, and voltage E in the test box, control the wind speed v to be within the range of 0m / s to 5m / s, the raindrop diameter d to be between 100 and 1000μm, and the voltage E to be between 0 and 35kV, repeat the above test steps, and obtain m groups of test working current intensity parameter data;

[0015] Step 2: Calculate the contact network water droplet collision coefficient γ under wind speed v, raindrop diameter d, and voltage E:

[0016]

[0017] Where γ is the contact network water drop collision coefficient, S0 is the area surrounded by the water drop released on the ground, S is the area surrounded by the water drop hitting the contact network surface, v is the wind speed, d is the raindrop diameter, and E is the voltage;

[0018] Calculate the ice-covered operation stability factor η of the contact network under different water drop collision coefficients γ:

[0019]

[0020] Step 3: Catenary ice operation stability assessment,

[0021] When η∈(0, 0.05), the contact network is operating stably; when η∈(0.05, +∞), the contact network is too ice-covered and needs to be de-iced as soon as possible.

[0022] The beneficial effects of the present invention are:

[0023] 1) By building an evaluation platform for the stability of catenary ice operation, it can effectively simulate the environmental conditions of the catenary under different actual wind speeds, electric fields and raindrop diameters, which is highly practical.

[0024] 2) Intelligent operation and control can be completed through the host computer, and data collection is convenient, accurate and efficient, which is universal for the evaluation of the stability of contact network icing operation in different complex environmental conditions.

[0025] 3) It can improve the theoretical calculation strategy and effectively perform analytical evaluation on the stability of catenary ice operation under different wind speeds, electric fields and raindrop diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall platform structure of the present invention; DETAILED DESCRIPTION

[0027] The specific implementation of the present invention is further described below with reference to the accompanying drawings. A method for evaluating the stability of catenary ice-covered operation considering the water droplet collision coefficient includes the following steps:

[0028] The first step is to close the switch (4), and send wind speed, raindrop diameter, and voltage setting signals to the air duct system (8), the simulated rainfall device (5), and the working voltage generation controller (2) through the host computer (1). The air duct system (8), the simulated rainfall device (5), and the working voltage generation controller (2) execute corresponding instructions, and the high-definition intelligent monitoring and measurement integrated device (6) identifies the area S0 surrounded by the water droplets released on the ground and the area S surrounded by the water droplets hitting the contact network surface in the measurement test box, and transmits the water drop collision coefficient γ to the host computer (1) through the data acquisition device (11);

[0029] Continue to monitor the icing condition of the contact network model (7) through the high-definition intelligent monitoring and measurement integrated device (6), and transmit the icing condition to the host computer (1) through the data acquisition device (11);

[0030] Adjust the switch to disconnect it, change the wind speed v, raindrop diameter d, and voltage E in the test box, control the wind speed v to be within the range of 2m / s to 10m / s, the raindrop diameter d to be between 100 and 1000μm, and the voltage E to be between 0 and 35kV, repeat the above test steps, and obtain m groups of test working current intensity parameter data;

[0031] Step 2: Calculate the contact network water droplet collision coefficient γ under wind speed v, raindrop diameter d, and voltage E:

[0032]

[0033] Where γ is the contact network water drop collision coefficient, S0 is the area surrounded by the water drop released on the ground, S is the area surrounded by the water drop hitting the contact network surface, v is the wind speed, d is the raindrop diameter, and E is the voltage;

[0034] Calculate the ice-covered operation stability factor η of the contact network under different water drop collision coefficients γ:

[0035]

[0036] Step 3: Catenary ice operation stability assessment,

[0037] When η∈(0, 0.05), the contact network is operating stably; when η∈(0.05, +∞), the contact network is too ice-covered and needs to be de-iced as soon as possible.

Claims

1. A method for evaluating the stability of catenary operation under ice coverage considering the water droplet collision coefficient, characterized in that: It includes a host computer (1), a working voltage generation controller (2), a working voltage generator (3), a switch (4), a rainfall simulation device (5), a high-definition intelligent monitoring and measurement integrated device (6), a contact network model (7), an air duct system (8), a high-voltage cable (9), a test box (10), a data acquisition device (11), and a comprehensive grounding device (12); The bottom grounding end of the contact network model (7) is connected to the integrated grounding device (12), and the contact network model (7) is placed inside the test box (10); The trigger interface of the working voltage generation controller (2) is connected to the input end of the working voltage generator (3), the host computer (1) is connected to the control end of the working voltage generation controller (2), the output end of the working voltage generator (3) is connected to the input end of the switch (4) through a high-voltage cable (9), and the output end of the switch (4) is connected to the input end of the contact network model (7); The simulated rainfall device (5), the high-definition intelligent monitoring and measurement integrated device (6), and the air duct system (8) are fixed inside the test box; The host computer (1) is connected to the rainfall simulation device (5) and the air duct system (8); The high-definition intelligent monitoring and measurement integrated device (6) is connected to the input end of the data acquisition device (11), and the output end of the data acquisition device (11) is connected to the host computer (1); The evaluation method of the above evaluation platform comprises the following steps: The first step: closing the switch (4), sending wind speed, raindrop diameter, and voltage setting signals to the air duct system (8), the simulated rainfall device (5), and the working voltage generation controller (2) through the host computer (1), respectively. The air duct system (8), the simulated rainfall device (5), and the working voltage generation controller (2) execute corresponding instructions, and the high-definition intelligent monitoring and measurement integrated device (6) identifies the area S0 surrounded by the water droplets released on the ground and the area S surrounded by the water droplets hitting the contact network surface in the measurement test box, and transmits the water drop collision coefficient γ to the host computer (1) through the data acquisition device (11); Continue to monitor the icing condition of the overhead contact network model (7) through the high-definition intelligent monitoring and measurement integrated device (6), and transmit the icing condition to the host computer (1) through the data acquisition device (11); Adjust the switch to disconnect it, change the wind speed v, raindrop diameter d, and voltage E in the test box, control the wind speed v to be within the range of 0m / s to 5m / s, the raindrop diameter d to be between 100 and 1000μm, and the voltage E to be between 0 and 35kV, repeat the above test steps, and obtain m groups of test working current intensity parameter data; Step 2: Calculate the contact network water droplet collision coefficient γ under wind speed v, raindrop diameter d, and voltage E: Where γ is the contact network water drop collision coefficient, S0 is the area surrounded by the water drop released on the ground, S is the area surrounded by the water drop hitting the contact network surface, v is the wind speed, d is the raindrop diameter, and E is the voltage; Calculate the ice-covered operation stability factor η of the contact network under different water drop collision coefficients γ: Step 3: Catenary ice operation stability assessment, When η∈(0, 0.05), the contact network is operating stably; when η∈(0.05, +∞), the contact network is too ice-covered and needs to be de-iced as soon as possible.

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