KR20160131778A

KR20160131778A - Life diagnostic Device of Capacitor Exchanging Gate Drive AND Method

Info

Publication number: KR20160131778A
Application number: KR1020150064819A
Authority: KR
Inventors: 김성준; 정승택
Original assignee: 한국철도공사
Priority date: 2015-05-08
Filing date: 2015-05-08
Publication date: 2016-11-16
Also published as: KR101781189B1

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for diagnosing the life of a capacitor-exchange type gate drive, and more particularly, to a method and apparatus for measuring the remaining lifetime of a capacitor-exchangeable gate drive corresponding to a drive unit for driving a large capacity semiconductor of an inverter- And diagnosing the lifetime of the invisible electronic component by presenting the clear data for the judgment of the part before the operation and the maintenance of the part The present invention also provides an apparatus and method for diagnosing the life of a capacitor-exchanged gate drive in which the maintenance of the railway car can be stabilized by preventive maintenance of the parts and the prevention of the spreading of the parts to the large and small parts.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for diagnosing the life of a capacitor-

The present invention relates to an apparatus and method for diagnosing the lifetime of a capacitor-exchangeable gate drive, and more particularly, to a method and apparatus for easily separating a capacitor module from a capacitor-exchangeable gate drive device and measuring the capacitance of the separated capacitor module To an apparatus and method for diagnosing the life of a capacitor-exchangeable gate drive capable of accurately predicting the life of a single product.

The latest railway vehicles are predominantly electric vehicles that use electric power as a power source,

With the advancement of advanced semiconductor technology, various types of power conversion devices have been used to supply the power and electric power required for the running of the railway vehicle through the electric and electronic control of the microprocessor.

The most representative of these is the large-capacity propulsion control system. The control system consists of a modular system in the form of a PCB.

The propulsion control device that converts the electric power required for running the electric railway vehicle to the traction motor is composed of a control unit, a driving unit, and a large-capacity power semiconductor.

In order to drive a large-capacity power semiconductors for railway vehicles, the traction motor is controlled by ON / OFF switching. In order to drive the traction motor, a part called a gate drive corresponding to a driving section for turning on / off the gate for a very short time is used. The mechanical and electrical characteristics are changed due to the heat generated during the switching operation, so that the performance of the vehicle such as not being able to start can be seriously damaged.

Therefore, it is necessary to diagnose and maintain the parts periodically according to the traveling distance and time, so that stable railway vehicles can be operated.

In addition, various malfunctions and deteriorating faults are caused by the internal and external temperature environment during the operation of the gate drive, and there is a great difficulty in diagnosing the cause and deterioration diagnosis.

In order to solve this problem, the inventor of the present invention has invented the patent application No. 10-2014-0108853 (entitled "Capacitor Switchable Gate Drive Device"),

Even when the gate drive fails, the connecting means can be easily exchanged without separating the connecting pins of the capacitor PCB from the connecting socket after separating the fastening means from the fixing portion, without the need for precision and skill.

Therefore, since only the capacitor PCB can be partially exchanged from the gate drive, it is possible to prevent a large failure in advance, and the maintenance cost for the safe operation of the railway vehicle and the operation of the railway vehicle can be reduced accordingly,

There has been no description of preferred means for measuring the lifetime of a capacitor-exchangeable gate drive device and a method for determining the arrival of a replacement.

Korean Patent No. 10-0924924 discloses a gate driver and a motor driving apparatus using the gate driver.

Korea registered patent [10-0924924] (Registration date: October 28, 2009)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide an apparatus for lifetime diagnosis of a capacitor-exchange type gate drive apparatus for driving a large capacity semiconductor of an inverter- , It is easy to separate the capacitor module from the capacitor-replaceable gate drive unit before the gate drive fails and maintain the capacitance of the separated capacitor module in maintenance state The present invention also provides an apparatus and method for diagnosing the lifetime of a capacitor-exchangeable gate drive that ensures safe operation of a railway vehicle by precisely preventing maintenance and preventing breakdowns by predicting an accurate lifetime of a single product.

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

According to an aspect of the present invention, there is provided an apparatus for diagnosing the life of a capacitor-exchanged gate drive, the apparatus comprising: a variable-voltage variable frequency inverter for receiving AC or DC from a catenary and supplying the DC voltage to a traction motor, A method of diagnosing the life of a capacitor-exchanged gate drive used in an electric railway vehicle of the type comprising: a measuring jig (110) connecting a capacitor module (10) of a capacitor- A temperature chamber part (100) including a thermostat (130) capable of temperature control on the basis of the temperature; A channel selection measuring unit 200 including a capacitance measuring unit 210 for measuring a capacitance of the capacitor module 10 and a measurement jig channel selector 220 for selecting a channel for each jig corresponding to the measuring jig 110, ; A computer unit 320 for diagnosing the availability and lifetime of the capacitor module 10 and for displaying and displaying a result based on the database, and a controller 320 for receiving the command from the computer unit 320, And a test unit 300 including a PLC command control unit 310 for controlling a test of the measurement unit 200 and the temperature chamber unit 100 and acquiring a test value.

In addition, the computer 320 may be configured such that the initial capacitance value (new standard) of the capacitor module 10 is set to the entire capacitance, and the capacitance range of the capacitor module suitable for operation and the capacitor The capacity range of the module is calculated, a stable driving reference capacity range is determined by setting a predetermined margin rate among the capacity range of the capacitor module suitable for operation, and the allowable electrostatic capacity is obtained as a percentage in accordance with the stable driving reference capacity range.

The method for diagnosing the lifetime of a capacitor-exchangeable gate drive according to an embodiment of the present invention includes the steps of: (a) forming a capacitor-exchangeable gate drive including a temperature chamber unit 100, a channel selection measurement unit 200, and a test unit 300; A method for diagnosing the life of a capacitor-replaceable gate drive of a life diagnosis apparatus, comprising the steps of: (S10) controlling a thermostat to set a temperature in a temperature chamber section (100) to a test temperature; A channel selecting step (S20) of selecting a channel of the capacitor module (10) as a test target attached to the measurement jig (110) from the channel selection measuring unit (200); A capacitance measurement step (S30) of measuring a capacitance of the capacitor module (10) of the channel selected in the channel selection step (S20); A life diagnosing step (S40) of diagnosing remaining life on the basis of the capacitance of the capacitor module (10) measured in the capacitance measuring step (30); A driving prediction step (S50) of predicting a serviceable time and a serviceable distance based on the remaining service life diagnosed in the service life diagnosis step (S40); And a driving determination step (S60) of determining whether or not the vehicle can be operated until the next inspection based on the estimated travelable time and travelable distance in the estimated travel step (S50).

In addition, the service life diagnosis step S40 may be performed by setting the initial capacitance value (new standard) of the capacitor module 10 as the total capacitance, and determining the capacity range of the capacitor module suitable for operation on the basis of the entire capacitance, Calculating a capacity range of the capacitor module and calculating a stable driving reference capacity range by setting a predetermined margin rate among capacity ranges of the capacitor modules suitable for driving; And an allowable electrostatic capacity calculating step (S42) of obtaining an allowable electrostatic capacity as a percentage according to a stable operation reference capacity range.

According to an apparatus and method for diagnosing the lifetime of a capacitor-exchangeable gate drive according to an embodiment of the present invention,

In order to diagnose the lifetime of the capacitor-exchangeable gate drive corresponding to the driving part of the power conversion device, it is necessary to provide a practical life-time diagnosis method in consideration of the operating environment and the operator's position and the capacitance measurement of the capacitor module, It is possible to intuitively transmit information by presenting clear data by judging the possibility of operation with numerical values and pictures.

Through this, it is possible to acquire diagnosis data of the life of the parts and to improve the efficiency of the management of the history of each vehicle, and at the same time, it is possible to prevent the spread to the middle and the large breakdown by stabilizing preventive maintenance.

Further, there is an effect that the remaining service life of the propulsion control device part can be diagnosed.

Based on field data based on operating environment and safety, it is effective to present clear data for determining whether the vehicle can be operated until the next overhaul of the part.

The preventive maintenance of parts can be prevented, and the spread of the railway vehicle can be restrained, thereby stabilizing the operation of the railway vehicle.

In addition, it is the first device in the world to measure the service life of components of the electric propulsion control system, which is the core technology of electric railway vehicles. , It is expected that the maintenance and repair of components of foreign-made propulsion control devices that have a lot of problems such as difficulty in existing approach and many troubles during operation It is very sustainable because it can develop the breakthrough method to diagnose, and it can be continuously reflected in the operation of core parts that meet the maintenance situation.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration of an apparatus for diagnosing the life of a capacitor-exchangeable gate drive according to an embodiment of the present invention; FIG.
2 is a conceptual view showing a capacitor-exchangeable gate drive;
FIGS. 3 to 4 are conceptual diagrams showing a process for diagnosing the life of a capacitor-exchangeable gate drive. FIG.
5 to 6 are flowcharts of a method for diagnosing the life of a capacitor-exchangeable gate drive according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concept of the term appropriately in order to describe its own invention in the best way. The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention. Further, it is to be understood that, unless otherwise defined, technical terms and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Descriptions of known functions and configurations that may be unnecessarily blurred are omitted. The following drawings are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the following drawings, but may be embodied in other forms. In addition, like reference numerals designate like elements throughout the specification. It is to be noted that the same elements among the drawings are denoted by the same reference numerals whenever possible.

FIG. 1 is a block diagram showing a configuration of a device for diagnosing the life of a capacitor-exchangeable gate drive according to an embodiment of the present invention, FIG. 2 is a conceptual view showing a capacitor-exchangeable gate drive, 5 is a flowchart illustrating a method of diagnosing the lifetime of a capacitor-type gate drive according to an embodiment of the present invention.

Prior to the description, the terms used in this specification (and claims) will be briefly described.

The 'capacitor-exchangeable gate drive' is a gate drive used in an inverter electric railway vehicle of a variable voltage variable frequency type in which alternating current or direct current is received from a catenary and supplied to a traction motor to drive a vehicle. Separable and replaceable gate drive. Here, the capacitor module 10 means that only the capacitors are formed on a separate circuit board.

The inverter is a gate drive circuit of a power semiconductor, receives a DC power of 100V, converts a square wave of 55.6V and 50KHz converted to an AC power via a DA converter into a plurality of parallel And smoothing using an electrolytic capacitor and switching the power semiconductor through the gate control optical signal according to the smoothed signal in the gate control unit for a very short time.

The gate drive is provided in a propulsion control device module referred to as an inverter device, and is modularly mounted on the lower part of the outside of the railway vehicle.

The capacitor module 10 is provided with a capacitor at its upper portion and a connection pin electrically connected to the connection socket at its lower portion.

The capacitor is provided as an electrolytic capacitor, and a plurality of electrolytic capacitors are connected in parallel.

The capacitor-exchangeable gate drive is provided in the converter unit and the inverter unit of the propulsion control unit. When the alternating current is inputted through the AC / DC mixer, the capacitor-exchangeable gate drive unit converts the DC voltage to DC power through the converter unit, And in the case of direct current, it is converted into alternating current through the inverter section to drive the motor.

The converter unit is composed of two parallel units, and drives a power semiconductor with a total of eight gate drives of GA85A. The inverter unit is composed of a total of six gate drives to drive a power semiconductor.

The inverter unit receives the DC power of 100 V through the gate drive circuit of the power semiconductor and supplies the square wave 55.6V and 50 KHz power converted to the AC power via the DA converter to the parallel And smoothing using an electrolytic capacitor and switching the power semiconductor through the gate control optical signal according to the smoothed signal in the gate control unit for a very short time.

The apparatus for diagnosing the life of a capacitor-exchangeable gate drive according to an embodiment of the present invention includes a capacitor module 10 in which a capacitor PCB 111 having an electrolytic capacitor in a capacitor-exchangeable gate drive By measuring the back electrostatic capacity, it is possible to accurately grasp the replacement life of the capacitor module 10 and reduce accidental failure.

As shown in FIG. 1, an apparatus for diagnosing the life of a capacitor-exchanged gate drive according to an embodiment of the present invention includes a variable voltage variable frequency type power supply unit for receiving alternating current or direct current from a catenary and supplying it to a traction motor, An apparatus for diagnosing the life of a capacitor-exchanged gate drive used in an inverter electric railway vehicle, comprising: a temperature chamber section (100); a channel selection measurement section (200); and a test section (300).

The present invention basically separates the capacitor module 10 (see FIG. 2) of the capacitor-exchanged gate drive to diagnose the separated capacitor module 10 to diagnose the lifetime of the capacitor-exchangeable gate drive device.

The temperature chamber section 100 includes a measuring jig 110 and a thermostat 130.

The measurement jig 110 connects the capacitor module 10 of the capacitor-exchangeable gate drive.

The measurement jig 110 can assign a number from # 1 to #N, and the number thus assigned means the channel. The number of #N depends on the configuration of the capacitor exchangeable gate drive by train combination / device .

The thermostat 130 is temperature controllable based on the temperature measured from the temperature sensor 120. [

The channel selection measurement unit 200 includes a capacitance meter 210 and a measurement jig channel selector 220.

The capacitance measuring device 210 measures the capacitance of the capacitor module 10.

The measurement jig channel selector 220 selects a channel for each jig corresponding to the measurement jig 110.

The test unit 300 includes a computer unit 320 and a PLC command control unit 310.

The computer 320 diagnoses the availability and lifetime of the capacitor module 10, displays the result, and displays the result based on the database.

That is, the remaining lifetime (%), the available time and the travelable distance shown in FIG. 4 are displayed in the computer unit 320, and whether or not it is possible to express the contents of FIG. 3 and FIG. It is possible to intuitively determine whether to exchange or repair a new product or not, and to set it in the computer unit 320 in accordance with the maintenance operation.

The PLC command control unit 310 receives a command from the computer unit 320 and controls the tests of the channel selection unit 200 and the temperature chamber unit 100 to acquire test values.

The temperature sensor 120 monitors the temperature of the computer unit 320 and monitors the temperature of the computer unit 320 through a PLC command control unit 310. The sensed temperature is controlled by the thermostat 130 Can be controlled.

The measurement jig channel selector 220 selects a channel for each jig corresponding to the measurement jigs 110 to #N, The selected channel measures the electrostatic capacity through the electrostatic capacity measuring device 210 according to the measurement jig number and displays the electrostatic capacitance value to the computer unit 320 to evaluate the life.

The computer unit 320 sets the initial capacitance value (new standard) of the capacitor module 10 to the total capacitance (refer to A in FIG. 3), and determines the capacitance range of the capacitor module (Refer to FIG. 3C) and a capacity range of the capacitor module unsuitable for operation (refer to FIG. 3D) are calculated, and a predetermined margin rate (refer to FIG. 3C) The reference capacitance range (see E in FIG. 3) is calculated, and the allowable electrostatic capacitance is obtained as a percentage (refer to FIG. 4) in accordance with the stable operation reference capacitance range.

Referring to FIG. 1, an apparatus for diagnosing the life of a capacitor-exchange type gate drive according to an embodiment of the present invention will be described. The test temperature is monitored / controlled by the temperature sensor 120 and the thermostat 130 of the temperature chamber unit 100 according to an instruction from the test unit 300 to create a test environment, The channel selection measuring unit 200 selects the channel of the capacitor module which is the test target attached to the measurement jigs 110 to #N and measures the capacitance from the capacitance measuring unit 210 and outputs the measured capacitance to the testing unit 300 And the computer unit 320 obtains the allowable electrostatic capacity shown in FIG. 2, displays the remaining service life (%) based on the obtained allowable electrostatic capacity, calculates the serviceable time and the travelable distance, , The capacitor It is possible to diagnose the life span of the exchangeable gate drive.

5, a method of diagnosing the lifetime of a capacitor-exchangeable gate drive according to an embodiment of the present invention includes a temperature chamber unit 100, a channel selection measurement unit 200, and a test unit 300, A method for diagnosing the life of a capacitor-replaceable gate drive of a replaceable gate drive, the method comprising: a test environment creation step (S10); a channel selection step (S20); a capacitance measurement step (S30) , A driving prediction step (S50), and a driving determination step (S60).

The test environment composition step S10 controls the thermostat to set the temperature in the temperature chamber part 100 to the test temperature.

The channel selection step S20 selects a channel of the capacitor module 10 as a test target attached to the measurement jig 110 from the channel selection measurement unit 200. [

The capacitance measurement step S30 measures the capacitance of the capacitor module 10 of the channel selected in the channel selection step S20.

Here, the measured capacitance is represented by a numerical value, and can be expressed as F (parity), which is a unit of the capacitance of the capacitor.

The life-time diagnosis step S40 diagnoses remaining life based on the capacitance of the capacitor module 10 measured in the capacitance measurement step 30.

The operation prediction step S50 predicts the serviceable time and the travelable distance on the basis of the remaining service life diagnosed in the service life diagnosis step S40.

In FIG. 4, the available time is set as a day, but it can be modified according to the operating environment. For example, if overhaul maintenance is performed every three years, the available time is a year including a decimal point .

In addition, although the travelable distance is given in units of Km, it can be modified according to the operating environment and the maintenance mode. For example, if overhaul maintenance is carried out every 540,000 km, the travelable distance is based on the unit of Km However, it is preferable that the standard distance unit is a standard for each country.

The driving determination step S60 determines whether or not the vehicle can be operated until the next inspection based on the estimated travelable time and the travelable distance in the travel prediction step S50.

Here, the next inspection means periodic inspection performed regularly.

That is, if the serviceable time and the travelable distance are insufficient until the next regular inspection, it can be determined that the operation is difficult until the next inspection. If it is determined that the operation until the next inspection is difficult, the capacitor module 10 is preferably replaced.

6, the life-time diagnosis step S40 of the method for diagnosing the life of the capacitor-exchange type gate drive according to an embodiment of the present invention includes a calculation of a travel criterion S41 and an allowable capacitance calculation S42 .

The operation standard calculation step S41 is a step in which the initial capacitance value (new standard) of the capacitor module 10 is set to the total capacitance (see A in FIG. 3), and the capacity of the capacitor module (Refer to FIG. 3C) of the capacity module of the capacitor module suitable for the operation (see FIG. 3C) and the capacity range of the capacitor module (See E in Fig. 3).

That is, the initial value of the capacitor module based on the new standard is indicated by the total capacitance.

At this time, the capacity range of the capacitor module suitable for the operation and the capacity range of the capacitor module unsuitable for the operation can be based on the operating experiential field data, and the allowance ratio can be calculated as a conservative criterion in order to increase the safety.

Here, the operational test field data means data accumulated over many years of experiment.

The allowable capacitance calculation step (S42) obtains the allowable electrostatic capacitance as a percentage (see FIG. 4) according to the stable operation reference capacitance range.

Next, with reference to FIG. 3 to FIG. 4, a method of determining whether or not the maintenance person can be operated until the next inspection according to the remaining service life measured through the allowable capacitance value will be described.

The initial capacitance value (new standard) can be diagnosed on the basis of the total electrostatic capacity as a remaining service life (%) in the life test step S40. As shown in FIG. 3, It is possible to predict the serviceable time and the travelable distance based on the remaining service life (%) diagnosed in the diagnosis step S40.

In other words, the remaining service life can be expressed as a percentage, and the serviceable time and the travelable distance can be calculated based on this.

The serviceable time and the serviceable distance can be used as a basis for determining whether or not the service can be performed from the operation determination step S60 to the next inspection.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: Temperature chamber part
110: measuring jig 120: temperature sensor
130: thermostat
200: channel selection measuring unit
210: Capacitance meter 220: Measurement jig channel selector
300: Test section
310: PLC command control unit 320:
S10: Test environment creation step S20: Channel selection step
S30: Capacitance measurement step S40: Life test step
S41: Estimation of operating criteria S42: Calculation of allowable capacitance
S50: Operation prediction step S60: Operation determination step

Claims

An apparatus for diagnosing the life of a capacitor-exchange type gate drive used in an inverter electric railway vehicle of a variable voltage variable frequency type in which alternating current or direct current is received from a catenary line and supplied to a traction motor to drive a vehicle,
A temperature chamber part 100 including a measuring jig 110 connecting the capacitor module 10 of the capacitor-exchangeable gate drive, a thermostat 130 capable of temperature control based on the temperature measured from the temperature sensor 120;
A channel selection measuring unit 200 including a capacitance measuring unit 210 for measuring a capacitance of the capacitor module 10 and a measurement jig channel selector 220 for selecting a channel for each jig corresponding to the measuring jig 110, ; And
A computer unit 320 for diagnosing the availability and lifetime of the capacitor module 10 and for displaying and displaying the results based on the database, and a controller 320 for receiving the commands from the computer unit 320, A test unit 300 including a PLC command control unit 310 for controlling the test of the unit 200 and the temperature chamber unit 100 and obtaining a test value;
And a capacitor connected to the gate of the capacitor.

The method according to claim 1,
The computer unit 320
The initial capacitance value (new standard) of the capacitor module 10 is taken as the total capacitance, the capacity range of the capacitor module suitable for operation and the capacity range of the capacitor module unsuitable for operation are calculated on the basis of the total electrostatic capacity, Wherein a predetermined allowance ratio is set in a capacity range of the capacitor module suitable for the capacitor replacement module to calculate a stable operation reference capacity range and a permissible electrostatic capacity is obtained as a percentage in accordance with the stable operation reference capacity range.

A method for diagnosing the life of a capacitor-exchangeable gate drive of a capacitor-exchange type gate drive lifetime diagnosis apparatus including a temperature chamber section (100), a channel selection measurement section (200) and a test section (300)
(S10) controlling the thermostat to set the temperature in the temperature chamber part (100) to the test temperature;
A channel selecting step (S20) of selecting a channel of the capacitor module (10) as a test target attached to the measurement jig (110) from the channel selection measuring unit (200);
A capacitance measurement step (S30) of measuring a capacitance of the capacitor module (10) of the channel selected in the channel selection step (S20);
A life diagnosing step (S40) of diagnosing remaining life on the basis of the capacitance of the capacitor module (10) measured in the capacitance measuring step (30);
A driving prediction step (S50) of predicting a serviceable time and a serviceable distance based on the remaining service life diagnosed in the service life diagnosis step (S40); And
A driving determination step (S60) of determining whether the vehicle can be operated until the next inspection based on the estimated travelable time and the travelable distance in the travel prediction step (S50);
Wherein the method further comprises the step of determining the lifetime of the capacitor-exchangeable gate drive.

The method of claim 3,
The life-span diagnosis step (S40)
The initial capacitance value (new standard) of the capacitor module 10 is taken as the total capacitance, the capacity range of the capacitor module suitable for operation and the capacity range of the capacitor module unsuitable for operation are calculated on the basis of the total electrostatic capacity, (S41) for estimating a stable operation reference capacity range by setting a predetermined allowance rate among the capacity ranges of the capacitor modules suitable for the operation of the compressor module; And
A step S42 of calculating an allowable electrostatic capacity to obtain an allowable electrostatic capacity as a percentage according to a stable operation reference capacity range;
Wherein the method further comprises the step of determining the lifetime of the capacitor-exchangeable gate drive.