CN108263248B - Method and device for detecting current of electric power train - Google Patents

Method and device for detecting current of electric power train Download PDF

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Publication number
CN108263248B
CN108263248B CN201611260022.7A CN201611260022A CN108263248B CN 108263248 B CN108263248 B CN 108263248B CN 201611260022 A CN201611260022 A CN 201611260022A CN 108263248 B CN108263248 B CN 108263248B
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China
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current
phase
output
phase difference
power supply
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CN201611260022.7A
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Chinese (zh)
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CN108263248A (en
Inventor
张志学
周方圆
吕顺凯
曹洋
仇乐兵
罗文广
胡景瑜
吴明水
邱文俊
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中车株洲电力机车研究所有限公司
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60MPOWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
    • B60M3/00Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
    • B60M3/04Arrangements for cutting in and out of individual track sections
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/005Testing of electric installations on transport means
    • G01R31/008Testing of electric installations on transport means on air- or spacecraft, railway rolling stock or sea-going vessels

Abstract

The invention provides a method and a device for detecting current of an electric power train, which are applied to a flexible automatic passing neutral-phase device, wherein after an initial phase difference between a voltage phase and a current phase of a first power supply arm is calculated, a first current is controlled to be added with a first preset current to obtain a current to be output, the current is transmitted to a neutral section through the power supply arm and the flexible automatic passing neutral-phase device to supply power to the electric power train, the current provided by the first power supply arm for the electric power train in a transition area is indirectly reduced, then the recalculated current phase difference is used as a first phase difference to be judged, if the first phase difference to be judged is not overturned compared with the initial phase difference, the current to be output is used as the first current to be added again until the phase difference is overturned, the output current at the overturning moment is determined to be transmitted to the neutral section, and the current size of the electric power train before the electric power train drives into the transition area is accurately known, the smooth switching between the electric power train devices is realized.

Description

Method and device for detecting current of electric power train

Technical Field

The invention relates to the technical field of passing neutral section of a traction power supply system of an electrified railway, in particular to a method and a device for detecting current of an electric power train.

Background

With the gradual change of electrified railways into the main body of railway transportation in China, the accurate and reliable operation of electric trains is related to the overall safety of railway transportation. The traction power supply of electric trains in China adopts a single-phase power frequency alternating current power supply mode, and in order to balance the electric load provided by three phases of an electric power system, an electric phase splitter needs to be arranged to prevent out-of-phase short circuit.

At present, when an electric power train passes through an interval where an electric split phase is located, power-off switching needs to be carried out, and therefore the operation condition of the electric power train is influenced. Therefore, the flexible automatic neutral section passing device is adopted to solve the problems and ensure the simple operation, the driving safety and the like of the electric power train.

The flexible automatic passing neutral section passing device enables the traction power supply arm and the flexible automatic passing neutral section passing device to simultaneously supply power to the electric power train in the transition region through the amplitude and the phase of the voltage of the neutral section, and gradually converts the current provided by the traction power supply arm for the electric power train into the current provided by the flexible automatic passing neutral section passing device, so that the electric power train can be completely supplied with power by the flexible automatic passing neutral section passing device when the electric power train drives into the neutral section, and the electric power train can pass through the neutral section without power failure.

However, the flexible automatic phase-passing device is difficult to accurately know the current magnitude of the electric train when the electric train enters the transition region, so that the current of the electric train cannot be smoothly switched between the power supply arm and the flexible automatic phase-passing device when the electric train exits the transition region, and arcing may occur when the electric train leaves the transition region. Therefore, a method for detecting the current of the electric power train of the flexible automatic passing neutral section device is needed, so that the flexible automatic passing neutral section device can acquire the accurate current of the electric power train when the electric power train enters the transition area, the smooth switching of the current of the electric power train between the traction power supply arm and the flexible automatic passing neutral section device is completed, and the purpose of automatically passing through electric neutral section of the electric power train can be achieved on the basis of no power failure.

Disclosure of Invention

In view of this, the present invention provides a method and an apparatus for detecting a current of an electric power train, which enable a flexible automatic phase-passing apparatus to accurately obtain a current provided by a traction power supply arm for the electric power train, so as to complete smooth switching of the current of the electric power train between the traction power supply arm and the flexible automatic phase-passing apparatus, and enable the electric power train to automatically pass through an electric phase-passing section without power failure.

In order to achieve the purpose, the invention provides the following technical scheme:

a detection method of electric train current is applied to a flexible automatic passing neutral section device and comprises the following steps:

when an incoming call signal sent by a first current transformer is received, calculating an initial phase difference between a voltage phase and a current phase of a first power supply arm, wherein the first power supply arm supplies power to an electric power train before the electric power train enters an electric phase splitting phase, and the first current transformer is arranged at the tail end of the first power supply arm;

controlling a first current to be added with a first preset current to obtain an incremental current, and taking the incremental current as a current to be output of the flexible automatic passing neutral section device, wherein the first current is the current for supplying power to the electric power train by the flexible automatic passing neutral section device when the electric power train enters a transition area;

the current to be output is transmitted to a neutral section to supply power to the electric power train;

calculating the current phase difference between the voltage phase and the current phase of the first power supply arm to serve as a first phase difference to be judged;

comparing the first phase difference to be judged with the initial phase difference, and judging whether the first phase difference to be judged is turned over;

if the first phase difference to be judged is not turned over, the current to be output is used as a first current, the first current is returned to be controlled and added with a first preset current to obtain an incremental current, and the incremental current is used as the current to be output of the flexible automatic passing phase splitting device;

and if the first phase difference to be judged is overturned, the current to be output is taken as the determined output current and is transmitted to the neutral section.

Preferably, the calculating an initial phase difference between the voltage phase and the current phase of the first power supply arm includes:

receiving a voltage phase of the first power supply arm sent by a voltage transformer;

receiving a current phase of the first power supply arm sent by the first current transformer;

and calculating to obtain an initial phase difference between the voltage phase and the current phase of the first power supply arm by taking a difference between the voltage phase and the current phase of the first power supply arm.

Preferably, after the first phase difference to be determined is inverted, the method further includes:

subtracting the current to be output from a second preset current to obtain a decreasing current;

delivering the decreasing current to the neutral section;

calculating the current phase difference between the voltage phase and the current phase of the first power supply arm to serve as a second phase difference to be judged;

comparing the second phase difference to be judged with the first phase difference to be judged, and judging whether the second phase difference to be judged is turned over;

and if the second phase difference to be judged is turned over, the current to be output is taken as the determined output current and is conveyed to the neutral section.

Preferably, after the delivering the current to be output to the neutral section as the determined output current, the method further includes:

and when an incoming call signal sent by a second current transformer is received, controlling the output current to decrease progressively according to the first preset current until the output current is zero, wherein the second current transformer is arranged at the front end of a second power supply arm, and the second power supply arm supplies power to the electric power train after the electric power train runs out of the electric phase separation.

A detection device of electric train current, comprising:

the first calculation module is used for calculating an initial phase difference between a voltage phase and a current phase of a first power supply arm when an incoming call signal sent by a first current transformer is received, wherein the first power supply arm supplies power to an electric power train before the electric power train enters an electric phase splitting phase, and the first current transformer is arranged at the tail end of the first power supply arm;

the adding module is used for controlling a first current to be added with a first preset current to obtain an incremental current, and the incremental current is used as a current to be output of the flexible automatic passing neutral section device, wherein the first current is a current for supplying power to the electric power train by the flexible automatic passing neutral section device in a transition area where the electric power train enters;

the first output module is used for transmitting the current to be output to a neutral section and supplying power to the electric power train;

the second calculation module is used for calculating the current phase difference between the voltage phase and the current phase of the first power supply arm after the first output module conveys the current to be output to the neutral section, and the current phase difference is used as a first phase difference to be judged;

the first judging module is used for comparing the first phase difference to be judged with the initial phase difference and judging whether the first phase difference to be judged is overturned;

the updating module is used for taking the current to be output as a first current when the first judging module judges that the first phase difference to be judged is not overturned;

correspondingly, the adding module is further configured to control the first current to be added to the first preset current after the updating module takes the current to be output as the first current, so as to obtain an incremental current, and take the incremental current as the current to be output of the flexible automatic neutral section passing device;

and the second output module is used for taking the current to be output as the determined output current and conveying the determined output current to the neutral section when the first judgment module judges that the first phase difference to be judged is overturned.

Preferably, the first calculation module comprises:

the first phase receiving module is used for receiving the voltage phase of the first power supply arm sent by the voltage transformer;

the second phase receiving module is used for receiving the current phase of the first power supply arm sent by the first current transformer;

and the first difference making module is used for making a difference between the voltage phase of the first power supply arm and the current phase of the first power supply arm, and calculating to obtain an initial phase difference between the voltage phase and the current phase of the first power supply arm.

Preferably, after the first determining module determines that the first phase difference to be determined is inverted, the method further includes:

the second difference making module is used for making a difference between the current to be output and the second preset current to obtain a decreasing current;

a third output module for delivering the decreasing current to the neutral section;

the third calculating module is used for calculating the current phase difference between the voltage phase and the current phase of the first power supply arm as a second phase difference to be judged after the third output module transmits the descending current to the neutral section;

the second judging module is used for comparing the second phase difference to be judged with the first phase difference to be judged and judging whether the second phase difference to be judged is overturned;

and the fourth output module is used for taking the current to be output as the determined output current and transmitting the determined output current to the neutral section when the second judgment module judges that the second phase difference to be judged is overturned.

Preferably, after the second output module delivers the current to be output to the neutral section as the determined output current, the method further includes:

and the decreasing module is used for controlling the output current to decrease progressively according to the first preset current when an incoming call signal sent by a second current transformer is received until the output current is zero, wherein the second current transformer is arranged at the front end of a second power supply arm, and the second power supply arm supplies power to the electric power train after the electric power train runs out of the electric phase separation.

Through the technical scheme, compared with the prior art, the invention provides the method and the device for detecting the current of the electric power train, which are applied to the flexible automatic passing phase splitting device, the method and the device for detecting the current of the electric power train are characterized in that after the initial phase difference between the voltage phase and the current phase of the first power supply arm is obtained through calculation, the first current is controlled to be added with the first preset current to obtain an incremental current, the incremental current is used as the current to be output, the current to be output is transmitted to the neutral section to supply power to the electric power train, so that the current provided by the first power supply arm for the electric power train in the transition area is indirectly reduced, the gradual transfer of the current provided for the electric power train between the power supply arm and the flexible automatic passing phase splitting device is realized, the current phase difference between the voltage phase and the current phase of the first power supply arm is calculated again to be used as the first phase difference to be judged, and if the first phase, and when the current is not turned over, the current to be output is taken as a first current and is added with a first preset current again, the current to be output at the turning moment is taken as an output current and is conveyed to a neutral section until the first phase difference to be judged is turned over, and at the moment, the magnitude and the phase of the output current are consistent with the magnitude and the phase of the current provided by the power supply arm before the power train enters the transition area, so that the smooth switching of the current of the power train between the power supply arm and the flexible automatic phase-passing device is realized, and the current is utilized to supply power when the power train runs in the neutral section, so that the aim of automatically passing through the electric phase-passing section without power failure of the power train is fulfilled.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a flowchart of a method for detecting a current of an electric power train according to an embodiment of the present invention;

fig. 2 is a flowchart of a method for calculating an initial phase difference between a voltage phase and a current phase of a first power arm according to an embodiment of the present invention;

fig. 3 is a flowchart of another method for detecting a current of an electric power train according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a detection device for electric current of an electric power train according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of another electric power train current detection device according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of an apparatus for calculating an initial phase difference between a voltage phase and a current phase of a first power supply arm according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of another electric power train current detection device according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment discloses a method for detecting current of an electric power train, which is applied to a flexible automatic passing neutral section device, and referring to fig. 1, the method specifically comprises the following steps:

s101: when an incoming call signal sent by a first current transformer is received, calculating an initial phase difference between a voltage phase and a current phase of a first power supply arm, wherein the first power supply arm supplies power to an electric power train before the electric power train enters an electric phase splitting phase, and the first current transformer is arranged at the tail end of the first power supply arm;

specifically, when an electric power train automatically passes through an electric phase separation, the electric power train needs to pass through a transition region in an interval where the electric phase separation is located, accurate detection of current of the electric power train is completed in the transition region, and the current of the electric power train is provided by a power supply arm which provides traction force before the electric power train drives into the transition region; in order to ensure that the flexible automatic passing phase separation device can immediately know when an electric train enters a transition region, the tail end of a first power supply arm for providing current for the electric train before the electric train enters the transition region and the position of the front end of the transition region are connected with a detection line in parallel, and a first current transformer is installed and used for detecting whether the electric train drives into the transition region in real time, so that current can flow through the first current transformer at the moment when a certain electric train drives into the transition region, the first current transformer sends an electric signal to the flexible automatic passing phase separation device to inform the flexible automatic passing phase separation device that the electric train drives into the transition region at the moment, and the flexible automatic passing phase separation device can continue to perform subsequent current detection operation; the detection line related to the embodiment of the invention can improve the anti-interference capability of the first current transformer in a multi-turn parallel connection mode.

Secondly, after the flexible automatic passing phase splitting device receives an incoming call signal sent by the first current transformer, the flexible automatic passing phase splitting device and the first power supply arm jointly supply power to the electric power train entering the transition area, meanwhile, the flexible automatic passing phase splitting device can also calculate the initial phase difference between the current voltage phase and the current phase of the first power supply arm in real time, and further can judge whether the current of the electric power train is smoothly transferred between the traction power supply arm and the flexible automatic passing phase splitting device or not by utilizing the initial phase difference.

S102: controlling a first current to be added with a first preset current to obtain an incremental current, and taking the incremental current as a current to be output of the flexible automatic passing neutral section device, wherein the first current is the current for supplying power to the electric power train by the flexible automatic passing neutral section device when the electric power train enters a transition area;

specifically, after the flexible automatic neutral section passing device calculates an initial phase difference between a voltage phase and a current phase of a first power supply arm, current is input into an electric train entering a transition area, and the input current is first current; at this time, the first power supply arm and the flexible automatic neutral section passing device simultaneously supply power to the electric power train in the transition area so as to ensure that the current of the electric power train before and after entering the transition area is always kept unchanged, so that the current provided by the first power supply arm for the electric power train can be reduced by a corresponding numerical value while the first current and the first preset current are added, and further the gradual transfer of the current provided for the electric power train between the power supply arm and the flexible automatic neutral section passing device is realized.

Wherein, the first preset current may be a value set according to a current increase characteristic, such as 0.1mA, 1mA, etc.; meanwhile, in order to ensure that the detection of the current of the electric power train can be completed in the transition region, the increasing speed of the first current can be controlled to shorten the time required for the current detection.

S103: the current to be output is transmitted to a neutral section to supply power to the electric power train;

specifically, after the flexible automatic neutral section passing device controls the first current to increase, the current to be output obtained after the increase needs to be transmitted to a neutral section to supply power to the electric power train.

S104: calculating the current phase difference between the voltage phase and the current phase of the first power supply arm to serve as a first phase difference to be judged;

specifically, when the increased current to be output is transmitted to the neutral section by the flexible automatic neutral section passing device to supply power to the electric power train, the current provided by the first power supply arm for the electric power train is reduced by a corresponding value, which may cause a change in a current phase difference between a voltage phase and a current phase of the first power supply arm, so that the current phase difference between the voltage phase and the current phase of the first power supply arm needs to be calculated in real time to ensure that the phase difference is the latest value.

S105: comparing the first phase difference to be determined with the initial phase difference, determining whether the first phase difference to be determined is turned, if not, executing S106a, and if so, executing S106 b;

specifically, the first power supply arm supplies traction power to the electric train before the electric train enters the electric phase splitting device, so that the phase difference between the voltage phase and the current phase of the first power supply arm can indicate the current working state of the electric train, if the phase difference is close to 0 degrees, the current working state of the electric train is indicated, and if the phase difference is close to 180 degrees, the current working state of the electric train is indicated.

For example, when the electric train just drives into the transition area, the first power supply arm supplies power to the electric train, so that the initial phase difference between the voltage phase and the current phase of the first power supply arm is close to 0 degrees, then the flexible automatic neutral section passing device controls the first current to increase, the current delivered by the first supply arm to the electric train is reduced, at which point the current phase difference between the voltage phase and the current phase of the first supply arm is recalculated, and if still close to 0, indicating that the first power supply arm still supplies power to the electric power train, the phase difference is consistent with the initial phase difference, S106a is executed, if the current phase difference between the voltage phase and the current phase of the first power supply arm is calculated to be close to 180 degrees, it indicates that the phase difference is reversed and the first power supply arm no longer supplies power to the power train and is provided entirely by the flexible auto-neutral section passing device, so S106b is performed. The phase difference between the voltage phase and the current phase of the first power supply arm may be inverted from approximately 0 ° to approximately 180 °, or from approximately 180 ° to approximately 0 °.

S106 a: taking the current to be output as a first current, and returning to S102;

specifically, after the electric power train enters the transition area, the first current provided by the flexible auto-phase-splitting device for supplying power to the electric power train is increased from zero, so that the first current may need to be increased to a certain value to turn over the phase difference between the voltage phase and the current phase of the first power supply arm, and correspondingly, the operation of determining whether the phase difference between the voltage phase and the current phase of the first power supply arm is turned over may also need to be performed multiple times, at this time, for each current to be output which fails to turn over the phase difference between the voltage phase and the current phase of the first power supply arm, the current to be output which is obtained at present needs to be used as the first current, the step of controlling the first current to be added with the first preset current to obtain an increased current, and the increased current is used as the current to be output, and judging whether the phase difference is reversed or not again after the next increasing operation is carried out until the phase difference is reversed, and then taking the current to be output corresponding to the reversing moment as the determined output current.

S106 b: taking the current to be output as the determined output current, and transmitting the determined output current to the neutral section;

specifically, when the phase difference between the voltage phase and the current phase of the first power supply arm is determined to be reversed, the current to be output, which is obtained by the flexible automatic neutral-section passing device at the time point when the phase difference is reversed, is used as the output current and is transmitted to the neutral section, and meanwhile, the output current is used as the current provided by the electric train when the electric train drives from the transition area to the neutral section, so that the electric train can automatically continue to run without power failure.

The determined output current is consistent with the current provided by the first power supply arm before the electric power train enters the transition region, the magnitude and the phase of the current are known by the flexible automatic passing phase splitting device, the current detection of the electric power train entering the transition region is further completed, and the power train entering the neutral section is supplied with power according to the accurately known output current subsequently, so that the current of the electric power train is kept unchanged during passing phase splitting, and arc discharge is avoided.

The method for detecting the current of the electric power train is applied to a flexible automatic passing neutral-phase separation device, after the initial phase difference between the voltage phase and the current phase of a first power supply arm is obtained through calculation, the first current is controlled to be added with a first preset current to obtain an incremental current, the incremental current is used as a current to be output, the current to be output is transmitted to a neutral section to supply power to the electric power train, the current provided by the first power supply arm for the electric power train in a transition area is indirectly reduced, the process that the current provided by the electric power train is gradually switched from the supply of the first power supply arm to the supply of the flexible automatic passing neutral-phase separation device is realized, the current phase difference between the voltage phase and the current phase of the first power supply arm is calculated again to be used as a first phase difference to be judged, and the result that whether the first phase difference to be judged is turned over or not after being compared with the initial phase difference is used as the result that the current of the electric power train is automatically passed through The judgment standard of smooth switching is completed among the devices, if the devices are not turned over, the current to be output is taken as the first current and added with the first preset current again, the current to be output at the turning moment is taken as the output current until the first phase difference to be judged is turned over, so that the current size and the phase provided by the power supply arm before the power train enters the transition area are accurately detected before the power train exits the transition area, the smooth switching of the current of the power train between the power supply arm and the flexible automatic phase-splitting device is realized, and the current is utilized to supply power when the power train runs in a neutral section, so that the purpose of automatic passing of electric phase-splitting is realized on the basis of no power failure of the power train.

After the above embodiment S106b, the method further includes:

and when an incoming call signal sent by a second current transformer is received, controlling the output current to decrease progressively according to the first preset current until the output current is zero, wherein the second current transformer is arranged at the front end of a second power supply arm, and the second power supply arm supplies power to the electric power train after the electric power train runs out of the electric phase separation.

Specifically, in the process that the electric power train moves from a neutral section to a neutral section, the flexible automatic passing neutral-section device transmits the determined output current to the neutral section, and then the electric power train is independently powered;

the second current transformer can be arranged on a section of detection line which is connected in parallel with the tail end of the other transition area and the front end of the second power supply arm, the second power supply arm and the other transition area can be in short circuit, and power is continuously supplied to the electric train after the electric train exits from the transition area; in addition, a current transformer and a voltage transformer are arranged at two ends of an interval where one electric split phase is located, so that when the flexible automatic passing split-phase device simultaneously passes the electric split phases in the ascending and descending process, current detection is respectively carried out on two electric trains.

Secondly, because the magnitude and the phase of the output current provided by the flexible automatic phase-splitting device for the electric power train are known, when the electric power train enters another transition region, the output current can be controlled to perform descending operation according to the first preset current until the output current is zero, so that the smooth switching of the electric power train current between the flexible automatic phase-splitting device and the second traction power supply arm is completed, then after the electric power train exits the transition region, the second power supply arm independently supplies power for the electric power train, and the provided current is consistent with the output current provided by the flexible automatic phase-splitting device.

In the embodiment of the invention, when a second incoming signal sent by a second current transformer is received, the output current is reduced progressively according to the first preset current until the output current is reduced to zero, and at the moment, the smooth switching of the current of the electric train between the flexible automatic neutral section passing device and the second power supply arm is completed, so that the arc discharge is avoided, and the electric train can automatically pass through one electric neutral section without power failure.

Referring to fig. 2, the specific implementation process of S102 involved in the foregoing embodiment includes the following steps:

s201: receiving a voltage phase of the first power supply arm sent by a voltage transformer;

specifically, after the flexible auto-passing phase splitting device receives an incoming call signal sent by a first current transformer, the current voltage phase of a first power supply arm can be obtained in real time through a voltage transformer; wherein, the voltage transformer can be arranged on a detection line which is connected with the first power supply arm and the flexible automatic phase-passing device in parallel.

S202: receiving a current phase of the first power supply arm sent by the first current transformer;

specifically, after the flexible auto-passing phase-splitting device receives an incoming call signal sent by the first current transformer, the flexible auto-passing phase-splitting device can acquire the current phase of the first power supply arm in real time through the first current transformer.

S203: the voltage phase of the first power supply arm is differed from the current phase of the first power supply arm, and the initial phase difference between the voltage phase and the current phase of the first power supply arm is calculated;

specifically, the flexible automatic passing neutral section device performs difference operation on the current voltage phase and current phase of the first power supply arm acquired in real time from the voltage transformer and the first current transformer respectively, so that an initial phase difference between the voltage and the current of the first power supply arm can be obtained, and a judgment basis is provided for smooth switching of the subsequent electric train current between the traction power supply arm and the flexible automatic passing neutral section device.

In the embodiment of the invention, the flexible automatic passing phase splitting device can acquire the current accurate voltage phase and current phase of the first power supply arm in real time through the voltage transformer and the first current transformer, and further obtain the initial phase difference between the voltage and the current of the first power supply arm by performing difference operation, so that accurate judgment basis is provided for finishing smooth switching of the subsequent electric train current between the traction power supply arm and the flexible automatic passing phase splitting device.

The embodiment discloses another method for detecting the current of an electric power train, which is applied to a flexible automatic passing neutral section device, and referring to fig. 3, the method specifically comprises the following steps:

s301: when an incoming call signal sent by a first current transformer is received, calculating an initial phase difference between a voltage phase and a current phase of a first power supply arm, wherein the first power supply arm supplies power to an electric power train before the electric power train enters an electric phase splitting phase, and the first current transformer is arranged at the tail end of the first power supply arm.

S302: and controlling a first current to be added with a first preset current to obtain an incremental current, and taking the incremental current as a current to be output of the flexible automatic passing neutral section device, wherein the first current is the current for supplying power to the electric power train by the flexible automatic passing neutral section device in a transition area where the electric power train enters.

S303: and transmitting the current to be output to a neutral section to supply power to the electric power train.

S304: and calculating the current phase difference between the voltage phase and the current phase of the first power supply arm as a first phase difference to be judged.

S305: comparing the first phase difference to be determined with the initial phase difference, determining whether the first phase difference to be determined is turned, if not, executing S306, and if so, executing S307.

S306: and taking the current to be output as a first current, and returning to S302.

S307: taking the current to be output as the determined output current, transmitting the determined output current to the neutral section, and then executing S308;

s308: subtracting the current to be output from a second preset current to obtain a decreasing current, and executing S309;

specifically, when the electric train runs in a transition area of an electric phase separation zone, the current working state of the electric train may change due to some factors, for example, the electric train is going to complete a downhill operation in the transition area, at this time, the working state of the electric train may be converted from a traction working condition to a braking working condition, and correspondingly, the phase difference between the voltage and the current of the first power supply arm may be turned from approximately 0 ° to approximately 180 ° to further cause the turning, but the reason for causing the phase difference to turn is caused by the braking of the electric train itself, and is not caused by the smooth switching of the electric train current between the traction power supply arm and the flexible auto-phase-splitting device, so that, in order to avoid the situation that the phase difference caused by other factors in the transition area of the electric train is turned, after it is determined that the first phase difference to be determined between the voltage and the current of the first power supply arm is turned, performing difference operation on the acquired current to be output and a second preset current to check whether the current overturning is caused by the fact that the current of the electric train is smoothly switched between the traction power supply arm and the flexible automatic phase-passing device; the second preset current may be a value set according to a current increase characteristic, such as 0.1mA, 1mA, or the like.

S309: the decreasing current is supplied to the neutral segment, and S3010 is performed.

S3010: calculating a current phase difference between the voltage phase and the current phase of the first power supply arm as a second phase difference to be determined, and executing S3011.

S3011: comparing the second phase difference to be judged with the first phase difference to be judged, judging whether the second phase difference to be judged is turned over, and if so, executing S3012;

specifically, after the current to be output and the second preset current are subjected to difference operation and the obtained decreasing current is transmitted to the electric power train, the current phase difference between the voltage phase and the current phase of the first power supply arm needs to be calculated again, if the current phase difference, namely the second phase difference to be judged is compared with the first phase difference to be judged, the inversion occurs, the current provided by the electric power train running in the transition area is proved to be transmitted by the flexible automatic neutral section passing device, and then after the first phase difference to be judged is overturned for one time compared with the initial phase difference, the flexible automatic phase-splitting device reduces the output current, so that the first power supply arm provides partial current for the electric power train again, so that the second phase difference to be judged is compared with the first phase difference to be judged and then overturned, and at the moment, the current magnitude and the phase provided by the first power supply arm before the electric power train drives into the transition area can be accurately detected; if the train does not turn over, the fact that the train turns over at this time is caused by other factors in the transition area is proved, and at the moment, the obtained current to be output is used for supplying power when the train drives into a neutral section, so that arc discharge can be generated.

S3012: and taking the current to be output as the determined output current and transmitting the determined output current to the neutral section.

Specifically, when the second phase difference to be judged is turned over, it is proved that the current of the electric power train is smoothly switched between the traction power supply arm and the flexible automatic phase passing device, the current to be output obtained at the current moment can be used as the current provided by the flexible automatic phase passing device for the electric power train entering a neutral section, so that the electric power train can keep the current size and the phase before entering the electric phase splitting, arc discharge is avoided, and the electric phase splitting can be automatically passed without power failure.

In the method for detecting the current of the electric power train disclosed by the embodiment of the invention, after the first phase difference to be judged is turned over, the current to be output obtained at present is subtracted from the second preset current, the obtained descending current is transmitted to the electric power train, the current phase difference between the voltage phase and the current phase of the first power supply arm is calculated again to be used as the second phase difference to be judged so as to compare the second phase difference to be judged with the first phase difference to be judged, if the second phase difference to be judged is turned over, the current to be output obtained at present is used as the determined output current and is transmitted to the electric power train so as to supply power for the electric power train in a neutral section, and the condition that the phase difference of the electric power train is turned over due to other factors in a transition area is effectively avoided, the detection of the current of the electric power train is more accurate.

The embodiment discloses a detection device for electric current of an electric power train, please refer to fig. 4, the device includes:

the first calculating module 401 is configured to calculate an initial phase difference between a voltage phase and a current phase of a first power supply arm when an incoming call signal sent by a first current transformer is received, where the first power supply arm supplies power to an electric train before the electric train enters an electric phase splitting phase, and the first current transformer is arranged at a tail end of the first power supply arm;

an adding module 402, configured to control a first current to be added to a first preset current to obtain an incremental current, and use the incremental current as a current to be output by the flexible automatic passing neutral section device, where the first current is a current for the flexible automatic passing neutral section device to supply power to the electric train in a transition area where the electric train enters;

a first output module 403, configured to deliver the current to be output to a neutral section to supply power to the electric power train;

a second calculating module 404, configured to calculate a current phase difference between a voltage phase and a current phase of the first power supply arm after the first output module 403 delivers the current to be output to a neutral section, as a first phase difference to be determined;

a first determining module 405, configured to compare the first phase difference to be determined with the initial phase difference, and determine whether the first phase difference to be determined is turned over;

an updating module 406, configured to use the current to be output as a first current when the first determining module 405 determines that the first phase difference to be determined is not flipped;

correspondingly, the adding module 402 is further configured to control the first current to be added to the first preset current after the updating module 406 takes the current to be output as the first current, so as to obtain an incremental current, and take the incremental current as the current to be output of the flexible automatic neutral-section passing apparatus;

a second output module 407, configured to, when the first determining module 405 determines that the first phase difference to be determined is inverted, take the current to be output as a determined output current, and deliver the determined output current to the neutral section.

The device for detecting the current of the electric power train disclosed by the embodiment of the invention obtains an incremental current by calculating the initial phase difference between the voltage phase and the current phase of the first power supply arm through the first calculation module 401, then controls the first current to be added with the first preset current through the addition module 402, takes the incremental current as the current to be output, then transmits the current to be output to the neutral section through the first output module 403 to supply power to the electric power train, indirectly reduces the current provided by the first power supply arm for the electric power train in the transition area, realizes the process that the current provided by the electric power train is gradually switched from the current provided by the first power supply arm to the current provided by the flexible automatic passing phase splitting device, at the moment, the second calculation module 404 calculates the current phase difference between the voltage phase and the current phase of the first power supply arm as the first phase difference to be determined, compares the first phase difference to be determined by the first determination module 405 with the initial phase difference, and then determines whether the phase difference is turned over or not The result is used as the judgment standard for the smooth switching of the current of the electric power train between the first power supply arm and the flexible automatic neutral section passing device, if the current is not turned over, the updating module 406 takes the current to be output as the first current, and the adding module 402 adds the first current to the first preset current again, until the first phase difference to be determined is inverted, the second output module 407 takes the current to be output at the time of inversion as the output current, and transmits the output current to the neutral section, therefore, before the electric power train drives out of the transition area, the current magnitude and the phase position provided by the power supply arm for the electric power train before driving into the transition area are accurately detected, and realizes the smooth switching of the current of the electric power train between the power supply arm and the flexible automatic passing neutral section device, meanwhile, the current is utilized to supply power when the electric power train runs in a neutral section, so that the electric power train can achieve the purpose of automatically passing through the electric phase splitting on the basis of no power failure.

Please refer to a method flowchart corresponding to fig. 1 for the working process of each module provided in the embodiment of the present invention, and detailed description of the working process is omitted.

The second output module 407 in the above embodiment delivers the current to be output to the neutral section as the determined output current, and further includes:

the decreasing module 408 is configured to, when an incoming call signal sent by a second current transformer is received, control the output current to decrease according to the first preset current until the output current is zero, where the second current transformer is disposed at a front end of a second power supply arm, and the second power supply arm supplies power to the electric power train after the electric power train runs out of the electric phase separation.

In the embodiment of the invention, when a second incoming signal sent by a second current transformer is received, the decrement module 408 enables the output current to perform decrement operation according to the first preset current until the output current is reduced to zero, and at the moment, the smooth switching of the current of the electric train between the flexible automatic neutral-section passing device and the second power supply arm is completed, so that arc discharge is avoided, and the electric train can automatically pass through one electric neutral section without power failure.

Some possible application scenarios related to the technical solution of the embodiment of the present invention are described below with reference to fig. 5.

As shown in fig. 5 for example, when an electric train enters a transition area a from left to right, a current flows through a current transformer CT1, so that the current transformer CT1 sends a first incoming signal to a flexible automatic passing phase splitting device, then the flexible automatic passing phase splitting device acquires an initial phase difference between a voltage phase and a current phase of a power supply arm T α, and starts to output a current to a neutral section, and supplies power to the electric train, and the output current increases from zero by 0.1mA each time, and after the current increases by 0.1mA each time, the flexible automatic passing phase splitting device calculates a current phase difference between the voltage phase and the current phase of the power supply arm T α in real time, and compares the current phase difference with the initial phase difference as a phase difference to be determined, and if it is determined that the phase difference to be determined is not turned over, the current obtained at present time is used as a current to be added for the next time, and is added to the current required for the flexible automatic passing phase splitting device to output when the train enters the neutral section for independent power supply;

the technical scheme of the embodiment of the invention mainly explores the steps of increasing the current output by the flexible automatic phase-passing device to realize the smooth switching of the current of the electric power train between the traction power supply arm and the flexible automatic phase-passing device, and accurately obtaining the real value of the current of the electric power train by comparing whether the initial phase difference and the current phase difference between the voltage phase and the current phase of the power supply arm are overturned so as to enable the electric power train to automatically pass through the electric phase-passing device without power failure in the subsequent process.

Referring to fig. 6, the first calculating module 401 involved in the above embodiment includes:

the first phase receiving module 4011 is configured to receive a voltage phase of the first power supply arm sent by a voltage transformer;

the second phase receiving module 4012 is configured to receive the current phase of the first supply arm sent by the first current transformer;

the first difference making module 4013 is configured to make a difference between a voltage phase of the first power supply arm and a current phase of the first power supply arm, and calculate an initial phase difference between the voltage and the current of the first power supply arm.

In the embodiment of the invention, through the first phase receiving module 4011 and the second phase receiving module 4012, the flexible automatic passing phase splitting device can obtain the current accurate voltage phase and current phase of the first power supply arm in real time, and further perform difference operation through the first difference making module 4013 to obtain the initial phase difference between the voltage and the current of the first power supply arm, so that an accurate judgment basis is provided for smooth switching of the subsequent electric train current between the traction power supply arm and the flexible automatic passing phase splitting device.

Please refer to a method flowchart corresponding to fig. 2 for the working process of each module provided in the embodiment of the present invention, and detailed description of the working process is omitted.

The embodiment discloses another electric train current detection device, please refer to fig. 7, the device includes:

a first calculating module 401, an adding module 402, a first output module 403, a second calculating module 404, a first judging module 405, an updating module 406, a second output module 407, a second difference making module 409, a third output module 4010, a third calculating module 4011, a second judging module 4012 and a fourth output module 4013;

the second difference making module 409 is configured to make a difference between the current to be output and the second preset current to obtain a decreasing current;

said third output module 4010 for delivering said decreasing current to said neutral section;

the third calculating module 4011 is configured to calculate a current phase difference between a voltage phase and a current phase of the first power supply arm as a second phase difference to be determined after the third output module 4010 delivers the decreased current to the neutral section;

the second judging module 4012 is configured to compare the second phase difference to be judged with the first phase difference to be judged, and judge whether the second phase difference to be judged is flipped;

the fourth output module 4013 is configured to, when the second determining module 4012 determines that the second phase difference to be determined is inverted, take the current to be output as the determined output current, and deliver the determined output current to the neutral section.

In the method for detecting the current of the electric power train disclosed by the embodiment of the invention, after the first phase difference to be judged is turned over, the current to be output obtained by the second difference making module 409 is made to be different from the second preset current, the obtained decreased current is transmitted to the neutral section by the third output module 4010, the third calculation module 4011 calculates the current phase difference between the voltage phase and the current phase of the first power supply arm again to be used as the second phase difference to be judged, so that the second judgment module 4012 compares the second phase difference to be judged with the first phase difference to be judged, if the second phase difference to be judged is turned over, the fourth output module 4013 takes the current to be output obtained currently as the determined output current and transmits the determined output current to the neutral section so as to supply power to the electric power train in the neutral section, and further effectively avoid the phenomenon that the phase difference of turning over due to other factors in the transition area of the electric power train The condition makes the detection of electric train current more accurate.

Please refer to a method flowchart corresponding to fig. 3 for the working process of each module provided in the embodiment of the present invention, and detailed description of the working process is omitted.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. A method for detecting the current of an electric power train is characterized in that the method is applied to a flexible automatic passing neutral section device and comprises the following steps:
when an incoming call signal sent by a first current transformer is received, calculating an initial phase difference between a voltage phase and a current phase of a first power supply arm, wherein the first power supply arm supplies power to an electric power train before the electric power train enters an electric phase splitting phase, and the first current transformer is arranged at the tail end of the first power supply arm;
controlling the first current to be added with a first preset current to obtain an incremental current, taking the incremental current as the current to be output of the flexible automatic passing phase splitting device, and continuously supplying power to the train after subtracting the first preset current from the current of the first power supply arm; the first current is the current for supplying power to the electric power train by the flexible automatic neutral section passing device in the transition area of the electric power train;
the current to be output is transmitted to a neutral section to supply power to the electric power train;
calculating the current phase difference between the voltage phase and the current phase of the first power supply arm to serve as a first phase difference to be judged;
comparing the first phase difference to be judged with the initial phase difference, and judging whether the first phase difference to be judged is turned over;
if the first phase difference to be judged is not turned over, the current to be output is used as a first current, the first current is returned to be controlled and added with a first preset current to obtain an incremental current, and the incremental current is used as the current to be output of the flexible automatic passing phase splitting device;
and if the first phase difference to be judged is overturned, the current to be output is taken as the determined output current and is transmitted to the neutral section.
2. The method of claim 1, wherein calculating an initial phase difference between a voltage phase and a current phase of the first supply arm comprises:
receiving a voltage phase of the first power supply arm sent by a voltage transformer;
receiving a current phase of the first power supply arm sent by the first current transformer;
and calculating to obtain an initial phase difference between the voltage phase and the current phase of the first power supply arm by taking a difference between the voltage phase and the current phase of the first power supply arm.
3. The method according to claim 1, further comprising, after the first phase difference to be determined is flipped:
subtracting the current to be output from a second preset current to obtain a decreasing current;
delivering the decreasing current to the neutral section;
calculating the current phase difference between the voltage phase and the current phase of the first power supply arm to serve as a second phase difference to be judged;
comparing the second phase difference to be judged with the first phase difference to be judged, and judging whether the second phase difference to be judged is turned over;
and if the second phase difference to be judged is turned over, the current to be output is taken as the determined output current and is conveyed to the neutral section.
4. The method of claim 1, further comprising, after said delivering said current to be output to said neutral section as said determined output current:
and when an incoming call signal sent by a second current transformer is received, controlling the output current to decrease progressively according to the first preset current until the output current is zero, wherein the second current transformer is arranged at the front end of a second power supply arm, and the second power supply arm supplies power to the electric power train after the electric power train runs out of the electric phase separation.
5. A detection device for electric train current, characterized by comprising:
the first calculation module is used for calculating an initial phase difference between a voltage phase and a current phase of a first power supply arm when an incoming call signal sent by a first current transformer is received, wherein the first power supply arm supplies power to an electric power train before the electric power train enters an electric phase splitting phase, and the first current transformer is arranged at the tail end of the first power supply arm;
the adding module is used for controlling the first current to be added with the first preset current to obtain an incremental current, taking the incremental current as the current to be output of the flexible automatic passing phase splitting device, and continuously supplying power to the train after subtracting the first preset current from the current of the first power supply arm; the first current is the current for supplying power to the electric power train by the flexible automatic neutral section passing device in the transition area of the electric power train;
the first output module is used for transmitting the current to be output to a neutral section and supplying power to the electric power train;
the second calculation module is used for calculating the current phase difference between the voltage phase and the current phase of the first power supply arm after the first output module conveys the current to be output to the neutral section, and the current phase difference is used as a first phase difference to be judged;
the first judging module is used for comparing the first phase difference to be judged with the initial phase difference and judging whether the first phase difference to be judged is overturned;
the updating module is used for taking the current to be output as a first current when the first judging module judges that the first phase difference to be judged is not overturned;
correspondingly, the adding module is further configured to control the first current to be added to the first preset current after the updating module takes the current to be output as the first current, so as to obtain an incremental current, and take the incremental current as the current to be output of the flexible automatic neutral section passing device;
and the second output module is used for taking the current to be output as the determined output current and conveying the determined output current to the neutral section when the first judgment module judges that the first phase difference to be judged is overturned.
6. The apparatus of claim 5, wherein the first computing module comprises:
the first phase receiving module is used for receiving the voltage phase of the first power supply arm sent by the voltage transformer;
the second phase receiving module is used for receiving the current phase of the first power supply arm sent by the first current transformer;
and the first difference making module is used for making a difference between the voltage phase of the first power supply arm and the current phase of the first power supply arm, and calculating to obtain an initial phase difference between the voltage phase and the current phase of the first power supply arm.
7. The apparatus according to claim 5, wherein after the first determining module determines that the first phase difference to be determined is flipped, the apparatus further comprises:
the second difference making module is used for making a difference between the current to be output and a second preset current to obtain a decreasing current;
a third output module for delivering the decreasing current to the neutral section;
the third calculating module is used for calculating the current phase difference between the voltage phase and the current phase of the first power supply arm as a second phase difference to be judged after the third output module transmits the descending current to the neutral section;
the second judging module is used for comparing the second phase difference to be judged with the first phase difference to be judged and judging whether the second phase difference to be judged is overturned;
and the fourth output module is used for taking the current to be output as the determined output current and transmitting the determined output current to the neutral section when the second judgment module judges that the second phase difference to be judged is overturned.
8. The apparatus of claim 5, further comprising, after the second output module delivers the current to be output to the neutral section as the determined output current:
and the decreasing module is used for controlling the output current to decrease progressively according to the first preset current when an incoming call signal sent by a second current transformer is received until the output current is zero, wherein the second current transformer is arranged at the front end of a second power supply arm, and the second power supply arm supplies power to the electric power train after the electric power train runs out of the electric phase separation.
CN201611260022.7A 2016-12-30 2016-12-30 Method and device for detecting current of electric power train CN108263248B (en)

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Publication number Priority date Publication date Assignee Title
CN103754135A (en) * 2014-01-20 2014-04-30 唐山轨道客车有限责任公司 Excessive phase control method and vehicle equipment
CN103863141A (en) * 2014-01-26 2014-06-18 西南交通大学 Control method based on cascade multilevel ground electrical phase-splitting device
CN105015366A (en) * 2015-07-16 2015-11-04 西南交通大学 Phase switching method for rapidly adjusting phase of reference voltage of inverter
CN105922894A (en) * 2016-04-22 2016-09-07 中国船舶重工集团公司第七〇二研究所 Passing neutral section system based on high-power converter device, and control method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103754135A (en) * 2014-01-20 2014-04-30 唐山轨道客车有限责任公司 Excessive phase control method and vehicle equipment
CN103863141A (en) * 2014-01-26 2014-06-18 西南交通大学 Control method based on cascade multilevel ground electrical phase-splitting device
CN105015366A (en) * 2015-07-16 2015-11-04 西南交通大学 Phase switching method for rapidly adjusting phase of reference voltage of inverter
CN105922894A (en) * 2016-04-22 2016-09-07 中国船舶重工集团公司第七〇二研究所 Passing neutral section system based on high-power converter device, and control method thereof

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