A method and system for evaluating the performance of the sliding electrical contact of the pantograph-catenary system of an electric locomotive

Abstract

The application provides a method for evaluating the performance of the pantograph-catenary system of an electric locomotive, comprising determining the current form of the pantograph-catenary performance in the electric locomotive; wherein the current form is one or more of the pantograph-catenary fluctuation pressure amplitude, the pantograph-catenary delay time and the pantograph-catenary fluctuation pressure curve waveform; obtaining the pantograph-catenary fluctuation pressure curve and the pantograph-catenary pressure curve changing with time under the current form and comparing them, and further judging the advantages and disadvantages of the pantograph-catenary performance under the current form according to the comparison result. The application provides a new method for evaluating the performance of the pantograph-catenary system.

Description

Technical Field

[0001] This invention relates to the field of electrified railway electric locomotive technology, and in particular to a method and system for evaluating the sliding electrical contact performance of the pantograph-catenary system of an electric locomotive. Background Technology

[0002] High-speed trains obtain traction current through the sliding electrical contact between the pantograph and the overhead contact line (i.e., the pantograph-catenary system). During electric locomotive operation, the pantograph-catenary system must maintain good contact to ensure the stability of this high-speed current collection. However, during high-speed train operation, the contact wire is excited by the pantograph, causing vibration in the contact line system. When the vibration intensifies, pantograph-catenary disconnection arcing occurs, leading to a decrease in current collection quality, and in severe cases, damage to the insulation, ultimately resulting in power outages and loss of traction and braking force. Increasing the contact pressure can effectively reduce pantograph-catenary disconnection arcing, but it increases mechanical wear on the contact wire and contact plate, reducing their service life and increasing the cost of use and maintenance. During testing on the French TGV high-speed train, pantograph-catenary disconnection arcing occurred intermittently at a speed of 200 km / h; at 300 km / h, it occurred frequently, and the contact line vibration became more severe; at 574.8 km / h, the pantograph-catenary system was completely in an abnormal contact arcing state.

[0003] The Sichuan-Tibet Railway has unique characteristics such as high altitude, high bridge-to-tunnel ratio, large temperature difference, and extremely long gradients, which significantly affect the current collection performance of the pantograph-catenary system. In particular, the changes in thermal stress and aerodynamic fluctuations caused by low air pressure under conditions of high altitude and large temperature difference lead to a reduction in the sliding electrical contact of the pantograph-catenary system.

[0004] Current research focuses on two main aspects: one is improving the current collection quality of electric locomotives by modifying the structure and material properties between the pantograph sliding contact and the contact wire, but this method has limited practical effectiveness; the other is employing active control theory for feedback control of the pantograph, but many fundamental issues remain unresolved. Therefore, it is necessary to evaluate the sliding contact performance of the pantograph-catenary system in electric locomotives.

[0005] However, existing methods for evaluating the performance of sliding electrical contacts in electric locomotive pantograph-catenary systems suffer from low accuracy due to the limited scope of evaluation and the simplistic nature of the methods. Therefore, it is necessary to improve existing evaluation methods for sliding electrical contacts in electric locomotive pantograph-catenary systems to enhance accuracy, thereby further improving the pantograph-catenary system and achieving optimal current collection and wear resistance in the sliding electrical contacts, ultimately extending the system's service life. Summary of the Invention

[0006] The technical problem to be solved by the embodiments of the present invention is to provide a method and system for evaluating the sliding electrical contact performance of the pantograph-catenary system of an electric locomotive. This method can solve the problem of low accuracy of evaluation results in existing evaluation methods, thereby improving the pantograph-catenary system based on the evaluation results, so that the sliding electrical contact of the pantograph-catenary system reaches the optimal current collection and wear state, and extends the service life of the pantograph-catenary system.

[0007] To address the aforementioned technical problems, embodiments of the present invention provide a method for evaluating the sliding electrical contact performance of an electric locomotive's pantograph-catenary system, the method comprising the following steps:

[0008] Determine the current manifestation of the grid-following behavior between the pantograph and the overhead contact line in an electric locomotive; wherein the current manifestation is one or more of the following: grid-following pressure amplitude, grid-following delay time, and grid-following pressure curve waveform;

[0009] The catenary fluctuation pressure curve and pantograph catenary pressure curve under the current performance conditions are obtained and compared over time. Furthermore, based on the comparison results, the advantages and disadvantages of the pantograph catenary catenary performance under the current performance conditions are judged.

[0010] The specific steps of obtaining and comparing the contact network fluctuation pressure curve and the pantograph-following-the-network pressure curve under the current performance mode, and further judging the quality of the pantograph-following-the-network performance under the current performance mode based on the comparison results, include:

[0011] Obtain the catenary fluctuation pressure curve and pantograph pressure curve over time under the current performance conditions;

[0012] Multiple time sampling points are set, and data are collected on the contact network fluctuation pressure curve and pantograph-following pressure curve under the current performance mode based on the multiple time sampling points set, so as to collect the contact network fluctuation pressure and pantograph-following pressure corresponding to each time sampling point under the current performance mode.

[0013] pass Calculate the contact wire fluctuation pressure and pantograph-following-the-wire pressure at each time sampling point under the current performance condition; where, F l and F p This indicates the contact wire fluctuation pressure and pantograph-following-the-grid pressure collected at the same sampling point under the same manifestation;

[0014] Based on the contact network fluctuation pressure and pantograph-following pressure corresponding to each sampling point under the current performance, and combined with the pantograph-following coefficient f calculated for each sampling point under the current performance, the quality of pantograph-following performance at each sampling point under the current performance is judged.

[0015] The specific steps for determining the quality of pantograph following the network at each sampling point under the current performance mode, based on the contact network fluctuation pressure and pantograph following the network pressure at each sampling point under the current performance mode, and combined with the following coefficient f calculated at each sampling point under the current performance mode, include:

[0016] Under the current performance format, the catenary fluctuation pressure F corresponding to each time sampling point is obtained. l and pantograph with grid pressure F p And the corresponding network coefficient f calculated from both;

[0017] If it is determined that the network coefficient f obtained at a certain time sampling point is less than 0 and the obtained pantograph network pressure F p > The obtained contact network fluctuation pressure F l If the current sampling point is determined to have excessive grid pressure, it will increase the wear of the pantograph's sliding plate.

[0018] If it is determined that the grid-f coefficient obtained at a certain time sampling point is 0 and the obtained pantograph grid-f pressure F p =The obtained contact network fluctuation pressure F l If so, it is determined that the pantograph's following property is optimal at the current sampling point, and the pantograph-catenary system coordination is optimal.

[0019] If it is determined that the network coefficient f obtained at a certain time sampling point is greater than 0 and the obtained pantograph network pressure F p <The obtained catenary fluctuation pressure F l If the current sampling point is determined to be low, the pantograph-catenary pressure is too low, the probability of pantograph-catenary disconnection increases, and pantograph-catenary arcing occurs frequently.

[0020] If it is determined that the network coefficient f obtained at a certain time sampling point is less than 0 and the obtained pantograph network pressure F p Exceeding the obtained catenary fluctuation pressure F l A certain upper limit, or determining that the grid coefficient f obtained at a certain time sampling point is greater than 0 and the obtained pantograph grid pressure F p Lower than the obtained contact network fluctuation pressure F l If a certain lower limit is set, it is determined that the pantograph's connection to the grid is poor at the current sampling point.

[0021] The pressure value on the pantograph-grid pressure curve is obtained by establishing the dynamic characteristic equation of the pantograph; the pressure value on the contact wire fluctuation pressure curve is obtained by establishing the dynamic characteristic equation of the contact wire.

[0022] The amplitude of the grid-following pressure fluctuation is determined by the magnitude of the grid-following pressure of the pantograph; the grid-following delay time is determined by the pantograph control delay time; and the waveform of the grid-following pressure fluctuation curve is determined by the external interference factors affecting the pantograph.

[0023] This invention also provides a system for evaluating the sliding electrical contact performance of the pantograph-catenary system in electric locomotives, comprising:

[0024] The grid-following behavior determination unit is used to determine the current grid-following behavior between the pantograph and the overhead contact line in an electric locomotive; wherein, the current behavior is one or more of the following: grid-following fluctuation pressure amplitude, grid-following delay time, and grid-following fluctuation pressure curve waveform;

[0025] The pantograph-following-the-network performance evaluation unit is used to acquire and compare the catenary fluctuation pressure curve and the pantograph-following-the-network pressure curve under the current performance conditions, and further judge the quality of the pantograph-following-the-network performance under the current performance conditions based on the comparison results.

[0026] The pantograph-network performance evaluation unit includes:

[0027] The curve acquisition module is used to acquire the contact network fluctuation pressure curve and the pantograph pressure curve with the network under the current performance.

[0028] The data sampling module is used to set multiple time sampling points and collect data on the catenary fluctuation pressure curve and pantograph-following pressure curve under the current performance mode based on the multiple time sampling points set, so as to collect the catenary fluctuation pressure and pantograph-following pressure corresponding to each time sampling point under the current performance mode.

[0029] The coefficient calculation module is used to calculate the coefficients by... Calculate the contact wire fluctuation pressure and pantograph-following-the-wire pressure at each time sampling point under the current performance condition; where, F l and F p This indicates the contact wire fluctuation pressure and pantograph-following-the-grid pressure collected at the same sampling point under the same manifestation;

[0030] The performance evaluation module is used to determine the quality of pantograph following the network at each time sampling point under the current performance form based on the contact network fluctuation pressure and pantograph following the network pressure corresponding to each time sampling point under the current performance form, and in combination with the following coefficient f calculated for each time sampling point under the current performance form.

[0031] The performance evaluation module includes:

[0032] The parameter acquisition submodule is used to acquire the catenary fluctuation pressure F at each time sampling point under a certain representation. l and pantograph with grid pressure F p And the corresponding network coefficient f calculated from both;

[0033] The first evaluation submodule is used to determine if the grid-f coefficient f obtained at a certain time sampling point is less than 0 and the obtained pantograph grid-f pressure F p > The obtained contact network fluctuation pressure F l If the current sampling point is determined to have excessive grid pressure, it will increase the wear of the pantograph's sliding plate.

[0034] The second evaluation submodule is used to determine if the grid-fed coefficient f = 0 at a certain time sampling point and the obtained pantograph grid-fed pressure F p =The obtained contact network fluctuation pressure F l If so, it is determined that the pantograph's following property is optimal at the current sampling point, and the pantograph-catenary system coordination is optimal.

[0035] The third evaluation submodule is used to determine if the grid-f coefficient f obtained at a certain time sampling point is greater than 0 and the obtained pantograph grid-f pressure F is equal to the grid-f pressure. p <The obtained catenary fluctuation pressure F l If the current sampling point is determined to be low, the pantograph-catenary pressure is too low, the probability of pantograph-catenary disconnection increases, and pantograph-catenary arcing occurs frequently.

[0036] The fourth evaluation submodule is used to determine if the grid-f coefficient f obtained at a certain time sampling point is less than 0 and the obtained pantograph-grid pressure F is... p Exceeding the obtained catenary fluctuation pressure F l A certain upper limit, or determining that the grid coefficient f obtained at a certain time sampling point is greater than 0 and the obtained pantograph grid pressure F p Lower than the obtained contact network fluctuation pressure F l If a certain lower limit is set, it is determined that the pantograph's connection to the grid is poor at the current sampling point.

[0037] The pressure value on the pantograph-grid pressure curve is obtained by establishing the dynamic characteristic equation of the pantograph; the pressure value on the contact wire fluctuation pressure curve is obtained by establishing the dynamic characteristic equation of the contact wire.

[0038] The amplitude of the grid-following pressure fluctuation is determined by the magnitude of the grid-following pressure of the pantograph; the grid-following delay time is determined by the pantograph control delay time; and the waveform of the grid-following pressure fluctuation curve is determined by the external interference factors affecting the pantograph.

[0039] Implementing the embodiments of the present invention has the following beneficial effects:

[0040] This invention utilizes the grid-following property to evaluate the performance of the sliding electrical contact of the pantograph-catenary system in electric locomotives in real time. By adjusting the grid-following pressure and following the fluctuation pressure of the contact wire in real time, the grid-following performance of the pantograph can be realized. This solves the problem of low accuracy of evaluation results in existing evaluation methods, greatly reduces friction and wear of the pantograph-catenary sliding friction pair and arc erosion, significantly reduces the offline rate and arcing rate of the pantograph-catenary system, enables the sliding electrical contact of the pantograph-catenary system to reach the optimal state of current collection and wear, and extends the service life of the pantograph-catenary system. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0042] Figure 1 A flowchart illustrating a method for evaluating the sliding electrical contact performance of a pantograph-catenary system in an electric locomotive, provided as an embodiment of the present invention;

[0043] Figure 2 A comparison diagram of the contact wire fluctuation pressure curve and the pantograph pressure curve with the contact wire, showing the change over time in the form of the fluctuation pressure amplitude with the contact wire, in a method for evaluating the sliding electrical contact performance of the pantograph-contact system of an electric locomotive provided in an embodiment of the present invention.

[0044] Figure 3 A comparison diagram of the contact wire fluctuation pressure curve and the pantograph pressure curve with respect to the contact wire, under the manifestation of the contact wire delay time, in a method for evaluating the sliding electrical contact performance of the pantograph-catenary system of an electric locomotive provided in an embodiment of the present invention.

[0045] Figure 4 A comparison diagram of the contact wire fluctuation pressure curve and the pantograph pressure curve with the contact wire, under the waveform of the contact wire fluctuation pressure curve, which are provided in the embodiment of the present invention for evaluating the sliding electrical contact performance of the pantograph-contact system of an electric locomotive, and the time-varying waveform of the contact wire fluctuation pressure curve.

[0046] Figure 5 This is a schematic diagram of a system for evaluating the sliding electrical contact performance of a pantograph-catenary system in an electric locomotive, provided as an embodiment of the present invention. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0048] The inventors discovered that, because the overhead contact line is a flexible system, it is subject to fluctuations at a certain frequency due to factors such as speed, environment, and disturbances caused by the pantograph's operation. These fluctuations include transverse and vertical waves. These vertical fluctuations cause changes in the contact pressure between the pantograph's sliding plate and the overhead contact line conductor. The pantograph compensates for these pressure changes through elastic deformation of its springs and through the elastoplastic deformation of the pantograph's sliding plate, thus reducing the magnitude of the pressure change. This compensating pressure, which compensates for the contact pressure changes caused by the pantograph's fluctuations, is called the "contact pressure," and its magnitude and direction are dynamically changing.

[0049] At this point, based on the pressure following the contact wire, the concept of "contact wire following performance" arose. This performance refers to the pantograph's ability to follow the contact wire's pressure, or in other words, the consistency between the pressure exerted by the pantograph on the contact wire and the elastic fluctuation pressure change trend of the contact wire.

[0050] Currently, the manifestations of network-related characteristics can be categorized into the following three forms:

[0051] a. Pressure amplitude fluctuating with the grid. It is normal for the pressure amplitude fluctuating with the grid to be greater or less than the pressure amplitude fluctuating with the contact wire, but a reasonable fluctuation range should be determined. The degree of grid fluctuating performance can be classified according to the magnitude of the difference.

[0052] b. Follow-up delay time (phase). The follow-up pressure applied by the pantograph generally lags behind the fluctuating pressure of the contact wire. The follow-up performance can be classified according to the length of the lag time or the magnitude of the lag phase.

[0053] c. Waveform of the pantograph-catenary line fluctuation pressure curve. Due to the complexity of the forces acting on the pantograph-catenary system, the real-time pantograph-catenary line fluctuation pressure characteristic curve waveform may differ from the contact wire fluctuation pressure characteristic curve waveform. The pantograph-catenary line fluctuation level can be classified according to the degree of difference between the two.

[0054] Therefore, based on the three manifestations of pantograph-catenary system performance mentioned above, the inventors propose a new method for evaluating the performance of the sliding electric contact in the pantograph-catenary system of electric locomotives. This method is used to evaluate the performance of the sliding electric contact in the pantograph-catenary system of electric locomotives in real time. The pantograph's pantograph performance can be achieved by adjusting the pantograph pressure and following the fluctuation pressure of the contact wire in real time.

[0055] In embodiments of the present invention, such as Figure 1 As shown, the inventor provides a method for evaluating the sliding electrical contact performance of the pantograph-catenary system of an electric locomotive, comprising the following steps:

[0056] Step S1: Determine the current form of the pantograph-contact wire connection in the electric locomotive; wherein the current form of connection is one or more of the following: the amplitude of the pressure fluctuation with the contact wire, the delay time with the contact wire, and the waveform of the pressure fluctuation curve with the contact wire.

[0057] Step S2: Obtain and compare the contact network fluctuation pressure curve and the pantograph-following-the-network pressure curve under the current performance mode, and further judge the advantages and disadvantages of the pantograph-following-the-network performance under the current performance mode based on the comparison results.

[0058] Specifically, in step S1, the current behavior of the pantograph and overhead contact line in the electric locomotive is determined. The amplitude of the pantograph-over-the-line pressure fluctuation is determined by the magnitude of the pantograph's pantograph-over-the-line pressure; the pantograph-over-the-line delay time is determined by the pantograph control delay time; and the waveform of the pantograph-over-the-line pressure fluctuation curve is determined by external interference factors affecting the pantograph.

[0059] It should be noted that when there are multiple variations in the amplitude of the pantograph-following pressure, the pantograph-following delay time, and the waveform of the pantograph-following pressure curve, it is mainly due to the inconsistency between the pantograph-following pressure and the pantograph-following pressure.

[0060] In step S2, firstly, the contact wire fluctuation pressure curve and the pantograph pressure curve with the contact wire, which change over time under the current performance mode, are obtained; wherein, the pressure value on the pantograph pressure curve with the contact wire is obtained by establishing the dynamic characteristic equation of the pantograph; the pressure value on the contact wire fluctuation pressure curve is obtained by establishing the dynamic characteristic equation of the contact wire.

[0061] In one example, such as Figure 2 As shown, the catenary fluctuation pressure curve varies with time under the manifestation of the catenary fluctuation pressure amplitude (e.g., Figure 2 (as shown by the solid line) and the pantograph's pressure curve with the grid (as shown by the solid line) Figure 2 (As shown by the dashed line); as Figure 3 As shown, the catenary fluctuation pressure curve varies with time under the manifestation of catenary delay time (e.g., Figure 3 (as shown by the solid line) and the pantograph's pressure curve with the grid (as shown by the solid line) Figure 3 (As shown by the dashed line); as Figure 4 As shown, the contact network fluctuation pressure curve varies with time under the waveform representation of the contact network fluctuation pressure curve (e.g., Figure 4 (as shown by the solid line) and the pantograph's pressure curve with the grid (as shown by the solid line) Figure 4 (As shown by the dashed line).

[0062] Secondly, multiple time sampling points are set, and data are collected on the catenary fluctuation pressure curve and pantograph-following pressure curve under the current performance mode based on the multiple time sampling points set, so as to collect the catenary fluctuation pressure and pantograph-following pressure corresponding to each time sampling point under the current performance mode.

[0063] Next, through Calculate the contact wire fluctuation pressure and pantograph-following-the-wire pressure at each time sampling point under the current performance condition; where, Fl and F p This indicates the contact network fluctuation pressure and pantograph-following-the-network pressure collected at the same sampling point under the same manifestation.

[0064] Finally, based on the contact network fluctuation pressure and pantograph-following pressure corresponding to each time sampling point under the current performance form, and combined with the pantograph-following coefficient f calculated for each time sampling point under the current performance form, the quality of pantograph-following performance at each time sampling point under the current performance form is judged.

[0065] In one example, under the current presentation, the catenary fluctuation pressure F collected at each time sampling point is obtained. l and pantograph with grid pressure F p And the corresponding network coefficient f calculated from both;

[0066] At this point, if it is determined that the grid-f coefficient obtained at a certain time sampling point is less than 0 and the obtained pantograph-grid pressure F is... p > The obtained contact network fluctuation pressure F l If the current sampling point is determined to have excessive grid pressure, it will increase the wear of the pantograph's sliding plate.

[0067] At this point, if it is determined that the grid-f coefficient obtained at a certain time sampling point is 0 and the obtained pantograph grid-f pressure F p =The obtained contact network fluctuation pressure F l If so, it is determined that the pantograph's following property is optimal at the current sampling point, and the pantograph-catenary system coordination is optimal.

[0068] At this point, if it is determined that the grid-f coefficient obtained at a certain time sampling point is greater than 0 and the obtained pantograph grid-following pressure F is... p <The obtained catenary fluctuation pressure F l If the current sampling point is determined to be low, the pantograph-catenary pressure is too low, the probability of pantograph-catenary disconnection increases, and pantograph-catenary arcing occurs frequently.

[0069] At this point, if it is determined that the grid-f coefficient obtained at a certain time sampling point is less than 0 and the obtained pantograph-grid pressure F is... p Exceeding the obtained catenary fluctuation pressure F l A certain upper limit (such as F) p >>F l ), or determine that the grid-f coefficient f obtained at a certain time sampling point is greater than 0 and the obtained pantograph grid-f pressure F p Lower than the obtained contact network fluctuation pressure F l A certain lower limit value (such as F) p < <F lIf the current sampling point at the time of determination is found to have poor pantograph-network connectivity, then it is concluded that the pantograph's connectivity with the network is poor.

[0070] like Figure 5 As shown in the embodiment of the present invention, a system for evaluating the sliding electrical contact performance of the pantograph-catenary system of an electric locomotive is provided, comprising:

[0071] The grid-following behavior determination unit 110 is used to determine the current grid-following behavior between the pantograph and the overhead contact line in the electric locomotive; wherein, the current behavior is one or more of the following: grid-following fluctuation pressure amplitude, grid-following delay time, and grid-following fluctuation pressure curve waveform;

[0072] The pantograph-following-the-network performance evaluation unit 120 is used to acquire and compare the contact network fluctuation pressure curve and the pantograph-following-the-network pressure curve under the current performance mode, and further judge the quality of the pantograph-following-the-network performance under the current performance mode based on the comparison results.

[0073] The pantograph-network performance evaluation unit 120 includes:

[0074] The curve acquisition module is used to acquire the contact network fluctuation pressure curve and the pantograph pressure curve with the network under the current performance.

[0075] The data sampling module is used to set multiple time sampling points and collect data on the catenary fluctuation pressure curve and pantograph-following pressure curve under the current performance mode based on the multiple time sampling points set, so as to collect the catenary fluctuation pressure and pantograph-following pressure corresponding to each time sampling point under the current performance mode.

[0076] The coefficient calculation module is used to calculate the coefficients by... Calculate the contact wire fluctuation pressure and pantograph-following-the-wire pressure at each time sampling point under the current performance condition; where, F l and F p This indicates the contact wire fluctuation pressure and pantograph-following-the-grid pressure collected at the same sampling point under the same manifestation;

[0077] The performance evaluation module is used to determine the quality of pantograph following the network at each time sampling point under the current performance form based on the contact network fluctuation pressure and pantograph following the network pressure corresponding to each time sampling point under the current performance form, and in combination with the following coefficient f calculated for each time sampling point under the current performance form.

[0078] The performance evaluation module includes:

[0079] The parameter acquisition submodule is used to acquire the catenary fluctuation pressure F corresponding to each time sampling point under the current display format.l and pantograph with grid pressure F p And the corresponding network coefficient f calculated from both;

[0080] The first evaluation submodule is used to determine if the grid-f coefficient f obtained at a certain time sampling point is less than 0 and the obtained pantograph grid-f pressure F p > The obtained contact network fluctuation pressure F l If the current sampling point is determined to have excessive grid pressure, it will increase the wear of the pantograph's sliding plate.

[0081] The second evaluation submodule is used to determine if the grid-fed coefficient f = 0 at a certain time sampling point and the obtained pantograph grid-fed pressure F p =The obtained contact network fluctuation pressure F l If so, it is determined that the pantograph's following property is optimal at the current sampling point, and the pantograph-catenary system coordination is optimal.

[0082] The third evaluation submodule is used to determine if the grid-f coefficient f obtained at a certain time sampling point is greater than 0 and the obtained pantograph grid-f pressure F is equal to the grid-f pressure. p <The obtained catenary fluctuation pressure F l If the current sampling point is determined to be low, the pantograph-catenary pressure is too low, the probability of pantograph-catenary disconnection increases, and pantograph-catenary arcing occurs frequently.

[0083] The fourth evaluation submodule is used to determine if the grid-f coefficient f obtained at a certain time sampling point is less than 0 and the obtained pantograph-grid pressure F is... p Exceeding the obtained catenary fluctuation pressure F l A certain upper limit, or determining that the grid coefficient f obtained at a certain time sampling point is greater than 0 and the obtained pantograph grid pressure F p Lower than the obtained contact network fluctuation pressure F l If a certain lower limit is set, it is determined that the pantograph's connection to the grid is poor at the current sampling point.

[0084] The pressure value on the pantograph-grid pressure curve is obtained by establishing the dynamic characteristic equation of the pantograph; the pressure value on the contact wire fluctuation pressure curve is obtained by establishing the dynamic characteristic equation of the contact wire.

[0085] The amplitude of the grid-following pressure fluctuation is determined by the magnitude of the grid-following pressure of the pantograph; the grid-following delay time is determined by the pantograph control delay time; and the waveform of the grid-following pressure fluctuation curve is determined by the external interference factors affecting the pantograph.

[0086] Implementing the embodiments of the present invention has the following beneficial effects:

[0087] This invention utilizes the grid-following property to evaluate the performance of the sliding electrical contact of the pantograph-catenary system in electric locomotives in real time. By adjusting the grid-following pressure and following the fluctuation pressure of the contact wire in real time, the grid-following performance of the pantograph can be realized. This solves the problem of low accuracy of evaluation results in existing evaluation methods, greatly reduces friction and wear of the pantograph-catenary sliding friction pair and arc erosion, significantly reduces the offline rate and arcing rate of the pantograph-catenary system, enables the sliding electrical contact of the pantograph-catenary system to reach the optimal state of current collection and wear, and extends the service life of the pantograph-catenary system.

[0088] It is worth noting that the various units included in the above system embodiments are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be achieved; in addition, the specific names of each functional unit are only for easy differentiation and are not used to limit the scope of protection of the present invention.

[0089] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as ROM / RAM, disk, optical disk, etc.

[0090] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A method for evaluating the sliding electrical contact performance of the pantograph-catenary system in an electric locomotive, characterized in that, The method includes the following steps: Determine the current manifestation of the grid-following behavior between the pantograph and the overhead contact line in an electric locomotive; wherein the current manifestation is one or more of the following: grid-following pressure amplitude, grid-following delay time, and grid-following pressure curve waveform; Obtain and compare the contact network fluctuation pressure curve and the pantograph-contact pressure curve under the current performance conditions, and further judge the advantages and disadvantages of the pantograph-contact performance under the current performance conditions based on the comparison results. The specific steps for obtaining and comparing the contact network fluctuation pressure curve and the pantograph-following-the-network pressure curve under the current performance condition, and further judging the merits of the pantograph-following-the-network performance under the current performance condition based on the comparison results, include: Obtain the catenary fluctuation pressure curve and pantograph pressure curve over time under the current performance conditions; Multiple time sampling points are set, and data are collected on the contact network fluctuation pressure curve and pantograph-following pressure curve under the current performance mode based on the multiple time sampling points set, so as to collect the contact network fluctuation pressure and pantograph-following pressure corresponding to each time sampling point under the current performance mode. pass Calculate the contact network fluctuation pressure and pantograph-following-the-network pressure formed by the contact network fluctuation pressure and the pantograph-following-the-network pressure at each time sampling point under the current performance condition. ;in, and This indicates the contact wire fluctuation pressure and pantograph-following-the-grid pressure collected at the same sampling point under the same manifestation; Based on the contact network fluctuation pressure and pantograph-following pressure corresponding to each sampling point under the current performance conditions, and combined with the follow-the-network coefficient calculated for each sampling point under the current performance conditions, To determine the quality of pantograph-grid performance at each sampling point under each current performance mode.

2. The method for evaluating the sliding electrical contact performance of the pantograph-catenary system of an electric locomotive as described in claim 1, characterized in that, Based on the contact network fluctuation pressure and pantograph-following pressure corresponding to each sampling point under the current performance conditions, and combined with the follow-the-network coefficient calculated for each sampling point under the current performance conditions, The specific steps for determining the quality of pantograph-grid connectivity at each sampling point under the current performance include: Under the current presentation format, the catenary fluctuation pressure collected at each time sampling point is obtained. and pantograph pressure and the corresponding network coefficients calculated from both. ; If we determine the random coefficients obtained at a certain time sampling point <0 and the obtained pantograph-grid pressure >The obtained overhead contact line fluctuation pressure If the current sampling point is determined to have excessive grid pressure, it will increase the wear of the pantograph's sliding plate. If we determine the random coefficients obtained at a certain time sampling point =0 and the obtained pantograph pressure along with the grid =The obtained contact network fluctuation pressure If so, it is determined that the pantograph's following property is optimal at the current sampling point, and the pantograph-catenary system coordination is optimal. If we determine the random coefficients obtained at a certain time sampling point >0 and the obtained pantograph-grid pressure <Acquired overhead contact line fluctuation pressure If the current sampling point is determined to be low, the pantograph-catenary pressure is too low, the probability of pantograph-catenary disconnection increases, and pantograph-catenary arcing occurs frequently. If we determine the random coefficients obtained at a certain time sampling point <0 and the obtained pantograph-grid pressure Exceeding the obtained catenary fluctuation pressure A certain upper limit, or to determine the network coefficients obtained at a certain time sampling point. >0 and the obtained pantograph-grid pressure Lower than the obtained overhead contact line fluctuation pressure If a certain lower limit is set, it is determined that the pantograph's connection to the grid is poor at the current sampling point.

3. The method for evaluating the sliding electrical contact performance of the pantograph-catenary system of an electric locomotive as described in claim 1, characterized in that, The pressure value on the pantograph-grid pressure curve is obtained by establishing the dynamic characteristic equation of the pantograph; the pressure value on the contact wire fluctuation pressure curve is obtained by establishing the dynamic characteristic equation of the contact wire.

4. The method for evaluating the sliding electrical contact performance of the pantograph-catenary system of an electric locomotive as described in claim 1, characterized in that, The amplitude of the grid-following pressure fluctuation is determined by the magnitude of the grid-following pressure of the pantograph; the grid-following delay time is determined by the pantograph control delay time; and the waveform of the grid-following pressure fluctuation curve is determined by the external interference factors affecting the pantograph.

5. A system for evaluating the sliding electrical contact performance of the pantograph-catenary system in electric locomotives, characterized in that, include: The grid-following behavior determination unit is used to determine the current grid-following behavior between the pantograph and the overhead contact line in an electric locomotive; wherein, the current behavior is one or more of the following: grid-following fluctuation pressure amplitude, grid-following delay time, and grid-following fluctuation pressure curve waveform; The pantograph-following-the-network performance evaluation unit is used to obtain and compare the catenary fluctuation pressure curve and the pantograph-following-the-network pressure curve under the current performance mode, and further judge the merits and demerits of the pantograph-following-the-network performance under each current performance mode based on the comparison results. The pantograph-network performance evaluation unit includes: The curve acquisition module is used to acquire the contact network fluctuation pressure curve and the pantograph pressure curve with the network under the current performance. The data sampling module is used to set multiple time sampling points and collect data on the catenary fluctuation pressure curve and pantograph-following pressure curve under the current performance mode based on the multiple time sampling points set, so as to collect the catenary fluctuation pressure and pantograph-following pressure corresponding to each time sampling point under the current performance mode. The coefficient calculation module is used to calculate the coefficients by... Calculate the contact network fluctuation pressure and pantograph-following-the-network pressure formed by the contact network fluctuation pressure and the pantograph-following-the-network pressure at each time sampling point under the current performance condition. ;in, and This indicates the contact wire fluctuation pressure and pantograph-following-the-grid pressure collected at the same sampling point under the same manifestation; The performance evaluation module is used to evaluate the contact network fluctuation pressure and pantograph-following pressure at each time sampling point under the current performance conditions, and to combine this with the follow-the-network coefficient calculated for each time sampling point under the current performance conditions. To determine the quality of pantograph-grid performance at each sampling point under the current performance mode.

6. The system for evaluating the sliding electrical contact performance of the pantograph-catenary system of an electric locomotive as described in claim 5, characterized in that, The performance evaluation module includes: The parameter acquisition submodule is used to acquire the catenary fluctuation pressure corresponding to each time sampling point under the current display format. and pantograph pressure and the corresponding network coefficients calculated from both. ; The first evaluation submodule is used to determine the random coefficients obtained at a certain time sampling point. <0 and the obtained pantograph-grid pressure >The obtained overhead contact line fluctuation pressure If the current sampling point is determined to have excessive grid pressure, it will increase the wear of the pantograph's sliding plate. The second evaluation submodule is used to determine the random coefficients obtained at a certain time sampling point. =0 and the obtained pantograph pressure along with the grid =The obtained contact network fluctuation pressure If so, it is determined that the pantograph's following property is optimal at the current sampling point, and the pantograph-catenary system coordination is optimal. The third evaluation submodule is used to determine the random coefficients obtained at a certain time sampling point. >0 and the obtained pantograph-grid pressure <Acquired overhead contact line fluctuation pressure If the current sampling point is determined to be low, the pantograph-catenary pressure is too low, the probability of pantograph-catenary disconnection increases, and pantograph-catenary arcing occurs frequently. The fourth evaluation submodule is used to determine the random coefficients obtained at a certain time sampling point. <0 and the obtained pantograph-grid pressure Exceeding the obtained catenary fluctuation pressure A certain upper limit, or to determine the network coefficients obtained at a certain time sampling point. >0 and the obtained pantograph-grid pressure Lower than the obtained overhead contact line fluctuation pressure If a certain lower limit is set, it is determined that the pantograph's connection to the grid is poor at the current sampling point.

7. The system for evaluating the sliding electrical contact performance of the pantograph-catenary system of an electric locomotive as described in claim 5, characterized in that, The pressure value on the pantograph-grid pressure curve is obtained by establishing the dynamic characteristic equation of the pantograph; the pressure value on the contact wire fluctuation pressure curve is obtained by establishing the dynamic characteristic equation of the contact wire.

8. The system for evaluating the sliding electrical contact performance of the pantograph-catenary system of an electric locomotive as described in claim 5, characterized in that, The amplitude of the grid-following pressure fluctuation is determined by the magnitude of the grid-following pressure of the pantograph; the grid-following delay time is determined by the pantograph control delay time; and the waveform of the grid-following pressure fluctuation curve is determined by the external interference factors affecting the pantograph.

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