KR102085369B1 - Apparatus and method for detecting contact loss of an electric rail vehicle - Google Patents

Abstract

The present invention relates to an apparatus for detecting contact loss of an electric rail vehicle and to a method thereof. According to one embodiment of the present invention, the apparatus for detecting contact loss comprises: a first sensor detecting a current signal among power collected by a current collecting portion of a pantograph connected to a car-line; a first signal processing unit detecting time information at a location where the amplitude and frequency increase instantaneously by applying a Tiger energy operator to the current signal detected by the first sensor; a second signal processing unit dividing the current signal detected by the first sensor into windows including a predetermined time interval, performing Fourier transformation while moving the window in accordance with the time interval, and detecting frequency information and magnitude information of the current signal in the time detected by the first signal processing unit; and a detection unit detecting at least one contact loss from the time information, frequency information, and magnitude information of the current signal detected by the first signal processing unit and the second signal processing unit.

Description

TECHNICAL APPARATUS AND METHOD FOR DEVELOPMENT OF ELECTRIC TRAIN CARS {APPARATUS AND METHOD FOR DETECTING CONTACT LOSS OF AN ELECTRIC RAIL VEHICLE}

The present invention relates to a two-wire phenomenon detection device and method for an electric railway vehicle.

In the field of electric railroads in Korea, the development of detector methods for voltage and current anomaly signals has not been actively studied. This is because most of the power quality analysis equipment being used for research in Korea is dependent on overseas products. In addition, chipsets and programs that perform major functions, even equipment manufactured in Korea, depend on foreign technology. In particular, electric railroads have structural features that are very vulnerable to power quality. This is caused by electric railroad cars operating at high speed, electric facilities using high voltage / high current, and local characteristics vulnerable to external environmental influences. In addition, the electric wires generated during the operation of the electric rail vehicle adversely affect power supply facilities such as substations and feeder lines due to arcs and harmonics, which acts as a factor to shorten the life of the equipment.

Among the adverse effects, it is important to analyze the phenomena of phenomena to improve the current collecting performance. As the traveling speed of the railway vehicle changes, the contact force of the pantograph changes, resulting in a physically non-contact two-wire phenomenon, which is one of the major problems accompanying the high speed of the electric railway. This two-wire phenomenon occurs during the supply of electric power from the streetcar to the pantograph, thereby causing arc discharge at the contact surface. The arc generated at this time wears a pantograph and a tram line, causing physical problems such as damage and shortening of life, as well as electrical problems in railway vehicles and internal circuits.

The above-mentioned background art is technical information acquired by the inventor for the derivation of the present invention or acquired in the derivation process of the present invention, and is not necessarily a known technology disclosed to the general public prior to the filing of the present invention.

Domestic registered patent publication No. 10-1176497

The present invention has been devised to solve the above-mentioned problems and / or limitations, and an object of the present invention according to an aspect is a TEO (teager energy operator) and a short time fourier for a current and voltage input to an electric railway vehicle. Transform) is a signal processing technique that accurately detects the time, frequency, and magnitude of the separation.

An apparatus for detecting a two-wire phenomenon of an electric railroad vehicle according to an embodiment of the present invention includes: a first sensor for detecting a current signal among power sources collected by a current collector of a pantograph connected to a train line; A first signal processing unit that detects time information at a location where the amplitude and frequency increase instantaneously by applying a Tigger energy operator to the current signal sensed by the first sensor; Dividing the current signal sensed by the first sensor into a window including a predetermined time interval, and performing Fourier transform while moving the window according to the time interval, performs frequency information and current in the time information detected by the first signal processor A second signal processor for detecting signal size information; And a determination unit for determining at least one bilinear phenomenon from the time information, the frequency information, and the size information of the current signal detected by the first signal processing unit and the second signal processing unit.

The first signal processing unit may apply the ticker energy operator after performing a discretization process on the current signal sensed by the first sensor.

The apparatus, the first signal processing unit and the second signal processing unit may sequentially perform the detection operation.

The apparatus may further include a display unit that displays the time information, the frequency information, the size information of the current signal, and one or more wire-line determination results detected by the first signal processing unit and the second signal processing unit; It can contain.

In accordance with another embodiment of the present invention, a two-wire phenomenon detection device for an electric railroad vehicle includes: a second sensor for detecting a voltage signal among power sources collected by a current collector portion of a pantograph connected to a vehicle line; A first signal processor configured to detect time information at a location where the amplitude and frequency increase instantaneously by applying a Tigger energy operator to the voltage signal sensed by the second sensor; The voltage signal sensed by the second sensor is divided into a window including a predetermined time interval, and a Fourier transform is performed while moving the window according to a time interval to perform frequency information and the voltage signal at a time detected by the first signal processor. A second signal processing unit to detect the size information of the; And a determination unit configured to determine one or more bilinear phenomena from the time information, the frequency information, and the size information of the voltage signal detected by the first signal processing unit and the second signal processing unit.

A method for detecting a two-wire phenomenon of an electric railroad vehicle according to an embodiment of the present invention includes: detecting, by a first sensor, a current signal among power sources collected by a current collector portion of a pantograph connected to a vehicle line; Detecting, by the first signal processing unit, time information at a location where the amplitude and frequency increase instantaneously by applying a Tigger energy operator to the current signal sensed by the first sensor; The time detected by the first signal processing unit by dividing the current signal sensed by the first sensor into a window including a predetermined time interval and performing a Fourier transform while moving the window according to the time interval by the second signal processing unit Detecting frequency information and size information of the current signal in the process; And determining, by the determination unit, one or more bilinear phenomena from the time information, the frequency information, and the size information of the current signal detected by the first signal processing unit and the second signal processing unit. have.

The method may further include applying, by the first signal processing unit, the ticker energy operator after performing a discretization process on the current signal sensed by the first sensor.

In the method, the detection operation of the first signal processing unit and the detection operation of the second signal processing unit may be sequentially performed.

The method may display, by a display unit, the time information, the frequency information, the size information of the current signal, and one or more bilinear phenomenon detection results detected by the first signal processing unit and the second signal processing unit. Step; may further include.

According to another embodiment of the present invention, a method for detecting a two-wire phenomenon of an electric railroad vehicle includes: sensing, by a second sensor, a voltage signal among power sources collected by a current collector of a pantograph connected to a vehicle line; Detecting, by the first signal processing unit, time information at a location where the amplitude and frequency increase instantaneously by applying a Tigger energy operator to the voltage signal sensed by the second sensor; The time detected by the first signal processing unit by dividing the voltage signal sensed by the second sensor into a window including a predetermined time interval and performing a Fourier transform while moving the window according to the time interval by the second signal processing unit Detecting frequency information and size information of the voltage signal in the process; And determining, by the determination unit, one or more bilinear phenomena from the time information, the frequency information, and the size information of the voltage signal detected by the first signal processing unit and the second signal processing unit. have.

In addition to this, other methods for implementing the present invention, other systems, and computer programs for executing the methods may be further provided.

Other aspects, features, and advantages than those described above will become apparent from the following drawings, claims, and detailed description of the invention.

According to the embodiments, it is possible to accurately detect the time, frequency, and magnitude of the occurrence of a wire by using the signal processing technique using TEO and STFT for the current and voltage input to the electric railway vehicle.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a view schematically illustrating a power supply system for an electric railroad vehicle according to an embodiment of the present invention.
FIG. 2 is a view schematically illustrating a two-wire phenomenon detection device provided in the electric railroad vehicle among the power supply systems of the electric railroad vehicle of FIG. 1.
3 and 4 are views showing an output signal indicating a bilinear phenomenon compared to an input signal in the bilinear phenomenon detecting apparatus of FIG. 2.
5 is a flow chart for explaining a method for detecting two-way phenomenon of an electric railroad vehicle according to an embodiment of the present invention.

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments presented below, but may be implemented in various different forms, and should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. . The embodiments presented below are provided to make the disclosure of the present invention complete, and to fully inform the scope of the invention to those skilled in the art to which the present invention pertains. In the description of the present invention, when it is determined that a detailed description of known technologies related to the present invention may obscure the subject matter of the present invention, the detailed description will be omitted.

Terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "include" or "have" are intended to indicate the presence of features, numbers, steps, actions, components, parts or combinations thereof described herein, one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance. Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from other components.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings, and in describing with reference to the accompanying drawings, the same or corresponding components are assigned the same reference numbers, and redundant description thereof is omitted. I will do it.

1 is a view schematically illustrating a power supply system for an electric railroad vehicle according to an embodiment of the present invention. Referring to FIG. 1, the electric railway vehicle feeding system includes a substation (SS) for feeding, and a feeding section (SP) with an opening / closing device (not shown) for division and extension of the feeding section. Or, in the event of an accident, the power supply section for the purpose of limiting the power outage, power outage section, or sub-sectioning post (SSP) for the purpose of extended power supply, compensation for voltage drop of the overhead power line and reduction of induced disturbance at the end of the power line ( auto transformer post, ATP) (not shown).

The feeding method is an AT method, in which an autotransformer (AT) is installed on a tram line and a feeder line, and a neutral point may be a feeder circuit method that is connected to a line and both ends are respectively connected to a tram line and a feeder line. Therefore, the tram line has a higher potential than the line, and the feed line has a lower potential than the line and the ground. Based on the secondary side of the AT transformer, 55 [kV] is applied between the electric line and the feeder line, and a neutral point is connected between the electric line and the line, so that a voltage of 27.5 [kV] can be applied.

In addition, in Figure 1, one end of the pantograph 100 is connected to a tram line between a substation (SS) and a subsectioning post (SSP), and the other end of the pantograph 100 is an electric railway vehicle ( 200), one end of the wheel 300 is connected to the electric railway vehicle, the other end of the wheel 300 is connected to the line between the substation (substation, SS) and the sub-section (post sectioning post, SSP) You can.

Here, the pantograph 100 is equipped with a current collector (not shown) in contact with the tram line on a woven frame that can be folded into a lozenge mounted on the roof of an electric railroad vehicle. have. The pantograph 100 may transmit the electric power required for the electric railway vehicle 200 to the electric railway vehicle 200 through contact with the electric vehicle line in the electric railway vehicle feeding system.

FIG. 2 is a view schematically illustrating a two-wire phenomenon detection device provided in the electric railroad vehicle among the power supply systems of the electric railroad vehicle of FIG. 1. Referring to FIG. 2, the electric railway vehicle 200 includes a two-wire phenomenon detection device 210, and the two-wire phenomenon detection device 210 includes a first sensor 211, a second sensor 212, and a collection unit 213. ), A first signal processing unit 214, a second signal processing unit 215, and a wire determination unit 216.

The first sensor 211 may detect a current signal among power sources collected by the current collector part of the pantograph 100 connected to the streetcar line. Here, the first sensor 211 may be said to sense the current between the tram line and the line shown in FIG. 1.

The second sensor 212 may sense the voltage signal among the power sources collected by the current collector part of the pantograph 100 connected to the streetcar line. Here, the second sensor 212 may be said to sense the voltage between the tram line and the line shown in FIG. 1.

The collection unit 213 may collect the current signal sensed by the first sensor 211 and the voltage signal monitored by the second sensor 212. In this embodiment, the collection unit 213 may further include a dioxide processing unit (not shown). The discretization processor may convert the continuously input current signal and voltage signal into digital signals.

The first signal processing unit 214 may detect time information at a location where the amplitude and frequency increase instantaneously by applying a Tigger energy operator to each of the current signal and the voltage signal converted from the collection unit 213 to a digital signal. That is, the first signal processing unit 214 may perform TEO signal processing on each of the current signal and the voltage signal converted into a digital signal to detect time information at a location where the amplitude and frequency increase instantaneously. In this embodiment, the first signal processing unit 214 and the second signal processing unit 215 may sequentially perform the detection operation. That is, the result of the detection operation of the first signal processing unit 214 may be received by the second signal processing unit 215 and reflected in the detection operation result.

The TEO signal processing of the first signal processing unit 214 is as follows. In general, an ideal current signal or voltage signal waveform may have the characteristics of pure sine waves in appearance. However, if harmonics occur, the pure sinusoidal waveform may be distorted. At this time, using the TEO signal processing method, it is possible to recognize time information at a location where the amplitude and frequency increase momentarily, that is, at the moment when the waveform distortion occurs. Assuming that the input current signal or voltage signal is x (t) = Acos (ωt), applying the Tigger energy operator to the voltage signal x (t) can be defined as in Equation 1 below.

When the current signal or the voltage signal is a discrete signal, the TEO value can be calculated as in Equation 2.

Here, n represents a natural number.

The second signal processing unit 215 divides each of the current signal and the voltage signal converted from the collection unit 213 into a digital signal into a window including a predetermined time interval, and performs a Fourier transform for each window to perform the first signal processing unit 214 Frequency information and size information of the current signal may be detected from the time information detected by. That is, the second signal processing unit 215 performs STFT signal processing on each of the current signal and the voltage signal converted into a digital signal to receive frequency information and size information of the current signal from the time information detected by the first signal processing unit 214. Can be detected.

The STFT signal processing of the second signal processing unit 215 is as follows. When the time domain is converted to the frequency domain through a fast fourier transform (FFT), which is generally used, information about time disappears, so it is impossible to determine at what point the signal corresponding to each frequency exists. . The method for solving this problem is STFT, and may be a time-frequency analysis method that can observe a frequency change over time by applying a moving window to the FFT.

The STFT performs Fourier transform while moving the window according to the time interval, and it is possible to check the frequency change over time. Equation 3 below is a STFT defined by using a Fourier transform applying a sliding window at continuous time.

Here, ω (t) may represent a time-window function. The larger the window size, the more detailed the frequency domain observation is possible, but the precision of the time domain may be reduced. Conversely, if the window size is small, the observation of the time domain may be fine and the event detection performance may increase, but the precision of the frequency domain may deteriorate. Therefore, the window size should be determined according to the characteristics of applying the STFT. On the other hand, in order to convert the STFT to the digital domain, it must be changed from continuous time to discrete-time as shown in Equation 4 below.

Since the discrete Fourier transform is calculated and moved for each sample according to a predetermined window size, it takes a very long calculation time, so in the actual implementation, high-spec calculation processing may be required.

The wire-line determining unit 216 may determine one or more wire-line phenomena from time information, frequency information, and size information of the current signal detected by the first signal processing unit 214 and the second signal processing unit 215. The wire line determination unit 216 is connected to the display unit (not shown) and inputs the current signal or voltage signal compared to the wire line determination unit 216 as a result of the wire line determination, that is, time information, frequency information, and the magnitude of the current signal Information can be displayed on the display.

FIG. 3 is a view showing an output signal indicating a bilinear phenomenon compared to an input current signal in the bilinear phenomenon detecting device. Referring to FIG. 3A, an input current signal is shown, and it can be seen that 0.3 [s] and 0.55 [s] each have a portion of zero current (two wires), which continues to be 12 [ms]. Referring to FIG. 3B, it can be seen that as a result of the first signal processing (TEO) for FIG. 3A, values much higher than other values of less than 1000 at about 3,300, 5,800 at 0.3 [s] and 0.55 [s], respectively. . The numerical values of the first signal processing are relative, and the absolute value is not important, and the value at the time when the separation occurs is rapidly changed so that the corresponding time can be accurately known. Referring to FIG. 3C, as a result of the second signal processing (STFT) of FIG. 3A, it is possible to accurately check time information, frequency information, and size information of a current signal in which a wire is generated due to noise of a current under control.

FIG. 4 is a view showing an output signal indicating a bilinear phenomenon compared to an input voltage signal in a bilinear phenomenon detecting device. Referring to FIG. 4A, an input voltage signal is shown, and it can be seen that overvoltage (two wires) occurs at 0.3 [s] and 0.55 [s], respectively, and continues 12 [ms]. When over-wire occurs, an abnormal overvoltage occurs. This is a phenomenon that occurs because the control does not operate correctly due to an abnormality in the input voltage. Referring to FIG. 4B, as a result of the first signal processing (TEO) for FIG. 4A, it can be seen that when the wire starts at 0.3 [s] and 0.55 [s], a value much higher than the other values of less than 2,000,000 is about 12,000,000, respectively. have. Through this, as in the analysis of the input current signal, the value at the time of occurrence of the wire changes rapidly so that the corresponding time can be accurately known. Referring to FIG. 4C, as a result of the second signal processing (STFT) of FIG. 4A, it is possible to accurately check time information, frequency information, and size information of a voltage signal in which a wire is generated due to noise generation of a current under control.

5 is a flow chart for explaining a method for detecting two-way phenomenon of an electric railroad vehicle according to an embodiment of the present invention. In the following description, portions overlapping with the descriptions of FIGS. 1 to 4 will be omitted.

Referring to FIG. 5, in step S510, the two-wire phenomenon detection device 210 senses each of the current signal and the voltage signal among the power sources collected by the current collector of the pantograph 100 connected to the tram line.

In step S520, the two-wire detection device 210 detects time information at a location where the amplitude and frequency increase instantaneously by applying a Tigger energy operator to each of the sensed current signal and voltage signal. Here, the two-wire phenomenon detection device 210 performs a discretization process of sampling and converting continuously input current signals and voltage signals into digital signals to apply the Tigger energy operator to the current signals and voltage signals subjected to the discretization process. You can.

In step S530, the two-wire detection device 210 divides each of the sensed current signal and voltage signal into a window including a predetermined time interval, performs Fourier transform for each window, and performs the frequency information and the magnitude of the current signal in the above-described time information. Information is detected.

In step S540, the bilinear phenomenon detection device 210 determines the occurrence of one or more bilinear phenomena using the information detected in steps S520 and S530. The two-wire phenomenon detection device 210 judges that a double line has occurred when a numerical value is much higher as a result of the first signal processing for each of the input current signal and the voltage signal from FIGS. 3 and 4 described above, and determines the time information at that time. After extracting and extracting the frequency information corresponding to the extracted time information and the size information of the current signal as the result of the second signal processing, the exact time at which the wire was generated, the frequency information at the time, and the size information for each voltage signal and current signal at that time You can know exactly.

The embodiment according to the present invention described above may be implemented in the form of a computer program that can be executed through various components on a computer, and such a computer program can be recorded on a computer-readable medium. At this time, the medium includes a hard disk, a magnetic medium such as a floppy disk and a magnetic tape, an optical recording medium such as a CD-ROM and DVD, a magneto-optical medium such as a floptical disk, and a ROM. , Hardware devices specially configured to store and execute program instructions, such as RAM, flash memory, and the like.

Meanwhile, the computer program may be specially designed and configured for the present invention or may be known and available to those skilled in the computer software field. Examples of computer programs may include machine language codes such as those produced by a compiler, as well as high-level language codes that can be executed by a computer using an interpreter or the like.

In the specification (particularly in the claims) of the present invention, the use of the term " above " and similar indication terms may be in both singular and plural. In addition, in the case of describing a range in the present invention, as including the invention to which the individual values belonging to the range are applied (if there is no contrary description), each individual value constituting the range is described in the detailed description of the invention. Same as

Unless explicitly stated or contrary to the steps constituting the method according to the invention, the steps can be done in a suitable order. The present invention is not necessarily limited to the order of description of the above steps. The use of all examples or exemplary terms (eg, etc.) in the present invention is merely for describing the present invention in detail, and the scope of the present invention is limited due to the examples or exemplary terms, unless it is defined by the claims. It does not work. In addition, those skilled in the art can recognize that various modifications, combinations, and changes can be configured according to design conditions and factors within the scope of the appended claims or equivalents thereof.

Accordingly, the spirit of the present invention is not limited to the above-described embodiment, and should not be determined, and the scope of the spirit of the present invention as well as the claims to be described later, as well as all ranges that are equivalent to or equivalently changed from the claims Would belong to

100: pantograph
200: electric railway vehicle
210: two-wire phenomenon detection device
211: first sensor
212: second sensor
213: acquisition unit
214: first signal processing unit
215: second signal processing unit
216: Lee Sun-judge
300: wheel

Claims (10)

A first sensor that senses a current signal from a power source collected by a current collector of a pantograph connected to a tram line;
A second sensor for sensing a voltage signal from the power source collected by the current collector;
A first signal processing unit that detects time information at a location where the amplitude and frequency increase instantaneously by applying a Tigger energy operator to the current signal and the voltage signal;
Dividing the current signal and the voltage signal into a window including a predetermined time interval, and performing a Fourier transform while moving the window according to the time interval, performs frequency information and frequency of the current signal from the time information detected by the first signal processor. A second signal processing unit for detecting size information and size information of the voltage signal; And
Including the time information, the frequency information, the size information of the current signal, and the size information of the voltage signal detected by the first signal processing unit and the second signal processing unit, and a determination unit for determining one or more bilinear phenomena Two-wire phenomenon detection device.
The method of claim 1, wherein the first signal processing unit,
After performing the discretization process on the current signal and the voltage signal, applying the Tigger energy operator, two-wire phenomenon detection device.
According to claim 1,
The first signal processing unit and the second signal processing unit sequentially performs a detection operation, a two-wire phenomenon detection device. According to claim 1,
A display unit that displays the time information, the frequency information, the size information of the current signal, the size information of the voltage signal, and the result of the determination of one or more wire phenomena detected by the first signal processing unit and the second signal processing unit; Two-line phenomenon detection device further comprising.
delete Sensing, by a first sensor, a current signal from a power source collected by a current collector of a pantograph connected to a vehicle line;
Sensing a voltage signal from the power source collected by the current collector by a second sensor;
Detecting, by the first signal processing unit, time information at a position where the amplitude and frequency increase instantaneously by applying a Tiger energy operator to the current signal and the voltage signal;
The second signal processing unit divides the current signal and the voltage signal into a window including a predetermined time interval, performs a Fourier transform while moving the window according to a time interval, and performs frequency at a time detected by the first signal processing unit. Detecting information and size information of the current signal; And
And determining, by the determination unit, one or more bilinear phenomena from the time information, the frequency information, and the magnitude information of the current signal detected by the first signal processing unit and the second signal processing unit. Method of detection.
The method of claim 6,
And applying the Tigger energy operator after performing the discretization process on the current signal and the voltage signal by the first signal processing unit.
The method of claim 6,
The first signal processing unit detection operation and the second signal processing unit detection operation is performed sequentially, two-way phenomenon detection method. The method of claim 6,
Display by the display unit, the time information, the frequency information, the size information of the current signal, the size information of the voltage signal, and the result of the determination of one or more wire phenomena detected by the first signal processing unit and the second signal processing unit Method of detecting a two-line phenomenon further comprising the step of. delete

Images