KR101470932B1 - System for estimating real time catenary impedance using the synchronized measuring power data between operation train and substation - Google Patents

Abstract

The present invention relates to a real-time line impedance calculation system using synchronized power data between a running vehicle and a substation, and more particularly to a real-time line impedance calculation system that acquires power data of a vehicle running in an AC (Alternating Current) Based on the synchronized power data, it is possible to calculate the impedance to the catenary line in real time. By using the calculated line impedance, it can be used for setting the protection area of the AC feeder protection relay and setting the expression function of the high- It is an object of the present invention to provide a method of predicting the impedance to the electric cable easily and changing the line condition of the AC feeding system in the future.
According to an aspect of the present invention, there is provided a substation transmission system including a substation for measuring voltage information of a feeder bus, current information of a catenary line and a feeder line of an up / down line, A measuring unit; A vehicle measurement unit for measuring voltage and current information of the vehicle, transmitting the measured voltage and current information, time information of the moving vehicle and positional information to the line impedance calculation unit; And a line impedance calculation unit for synchronizing information measured through the substation measurement unit and the vehicle measurement unit according to time information to calculate a substation impedance and a vehicle impedance based on the synchronized information and calculating a final line impedance by distance; .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for estimating the impedance of a vehicle and a substation using synchronous power data between the vehicle and a substation,

More particularly, the present invention relates to a system for real-time acquisition of power information between a railway vehicle and a substation and a system for calculating impedance from the synchronized information of the power information acquisition apparatus in real time to the electric line More particularly, to a method and apparatus for acquiring power data of a vehicle running in an alternating current (AC) power supply system of an electric railway and power data of a substation in real time, and estimating an impedance magnitude of a catenary based on synchronized power data And more particularly, to a real-time line-to-line impedance calculation system using synchronized power data between a moving vehicle and a substation.

With regard to the technique of deriving the impedance, there have been numerous applications and disclosures in addition to Korean Patent No. 10-1093770 (hereinafter referred to as "prior art").

The foregoing prior art document discloses a method for measuring line constants of a catenary line comprising a plurality of conductors, comprising the steps of: classifying conductors connected to each other into equipotential conductors and classifying them into a predetermined conductor group; Measuring the line constants after equalizing the conductor groups divided by the equivalent modeling method in the step of measuring the line constants. In the step of measuring the line constants, voltage and current are applied between the conductors by the catenary lines, And derives the impedance and the line-to-line admittance based on the measured voltage-current relationship to measure the line constant of each conductor group with respect to the actual line section. In order to derive the impedance, For a catenary circuit, all the conductor groups are short-circuited in the power supply class, and the voltage-current is measured for different combinations of conductor terminals at the substation.

The existing electric line impedance calculation is based on the electric line data of the electric line including the electric line, the wire line, the rail, and the feed line which constitute the electric line line method (the domestic standard is the simple curtain line method) Based on the construction information such as height, tension, etc., the impedance value to the line of the corresponding section is calculated through the Carson-Pollazek equation.

This calculation method can calculate the representative value (km) per unit length of the impedance to the catenary line of the corresponding section based on the information constituting the catenary line, and the impedance of the calculated catenary line is the impedance of the impedance relay It is used for correction.

The impedance calculated from the existing Carson-Pollazek calculation formula is a representative impedance of the catenary line per unit length. Since the installation conditions of various catenary lines such as the earth section, the bridge section and the tunnel section can not all be satisfied, A technique has been proposed in which an artificial ground fault test apparatus or a separate device for measuring impedance by a catenary line is manufactured and an impedance of the catenary line is calculated by artificially shorting (grounding) the catenary line. This calculation method can be calculated more realistic value than the existing Carson-Pollazek calculation formula because it is calculated through on-line measurement in the actual catenary line, and the magnitude of the impedance according to the distance from the substation can also be calculated. However, the artificial earth fault tester and the electric line impedance measuring device artificially short-circuit (ground) the electric cable line, so that a large short-circuit current can flow. Therefore, a current limiting device is added to limit the current to an appropriate size in order to minimize damage to the equipment from such a large short-circuit current.

That is, although the conventional method using the Carson-Pollazek formula can calculate the representative value of the impedance to the catenary line of the corresponding catenary line using the catenary line information, since it can not reflect various line conditions of the catenary line, There is a problem that it is difficult to calculate the impedance for each distance from the substation. In addition, the impedance calculation method of the catenary line impedance measurement using the artificial ground fault tester and the catenary impedance measurement device can calculate the impedance through the short circuit (ground fault) test in the actual system, and the existing Carson- Pollazek calculation formula The impedance and the error can be minimized, and the impedance for each distance can be calculated from the substation through the short circuit (ground fault) test at each desired position. There is also an advantage in that it is possible to correct the high-intensity facial expression system of the reactance system based on the impedance by the distance. However, in order to limit the large currents generated by an artificial short circuit (ground fault) test, some errors may occur with the current limiter, and whenever there is a change in the element that affects the impedance to the catenary, There is a drawback to perform an artificial short circuit test. Especially, it is necessary to carry out the test on the actual service route. Therefore, there is a disadvantage that the impedance measurement test can not be carried out by the catenary line at the train operating time. There is a problem that a lot of short- have.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a method and apparatus for acquiring power data of a vehicle and power data of a substation running in an alternating current (AC) Based on the electric power data, in real time.

It is another object of the present invention to utilize the calculated electric line impedance to set the protection area of the protective relay of the AC feeder system and to set the expression function of the high-gain facial expression device, and to easily change the line conditions of the AC feeder system To predict the impedance to the catenary line and to provide the information.

In order to accomplish the above object, the present invention provides a real-time line impedance calculation system using synchronized power data between a running vehicle and a substation, comprising: measuring voltage information of a feeder bus and current information of a feeder line and a feeder line of an up- A substation measuring unit including the measured voltage and current information and time information and transmitting the measured voltage and current information to the line impedance calculating unit; A vehicle measurement unit for measuring voltage and current information of the vehicle, transmitting the measured voltage and current information, time information of the moving vehicle and positional information to the line impedance calculation unit; And a line impedance calculation unit for synchronizing information measured through the substation measurement unit and the vehicle measurement unit according to time information to calculate a substation impedance and a vehicle impedance based on the synchronized information and calculating a final line impedance by distance; .

According to the present invention, since the line impedance is calculated from the measured values according to various line conditions of the catenary line section, compared with the conventional method using the Carson-Pollazek calculation formula, the accuracy of the line impedance is high, It is possible to calculate the line impedance along the distance.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall schematic diagram showing a real-time line impedance calculation system using synchronized power data between a running vehicle and a substation according to the present invention; FIG.
2 is a diagram illustrating an example of a method of calculating a line impedance in a single line system according to the present invention.
3 is a diagram showing an example of a line impedance calculation method in a double-wire system according to the present invention.
Fig. 4 is an example showing impedance magnitudes according to distances viewed from a substation according to the present invention; Fig.
FIG. 5 is a diagram showing an example in which the line impedance calculating unit according to the present invention is interlocked with a conventional high-strength facial expression apparatus. FIG.
FIG. 6 is a diagram showing an example in which a real-time line impedance calculation system using synchronized power data between a running vehicle and a substation according to the present invention is applied.

Specific features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. It is to be noted that the detailed description of known functions and constructions related to the present invention is omitted when it is determined that the gist of the present invention may be unnecessarily blurred.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings.

A real-time catenary impedance calculation system using synchronized power data between a traveling vehicle and a substation according to the present invention will now be described with reference to FIGS. 1 to 6. FIG.

FIG. 1 is an overall diagram conceptually showing a real-time line impedance calculation system S using synchronized power data between a traveling vehicle and a substation according to the present invention. As shown in FIG. 1, the substation measurement unit 100, 200 and a line impedance calculating unit 300.

The substation measuring unit 100 measures the voltage information of the feeder bus, the current information of the electric line and the feeder line of the up / down line, and transmits the measured voltage and current information and the time information to the line impedance calculating unit 300.

The vehicle measurement unit 200 measures voltage and current information of the vehicle, and transmits the measured voltage and current information to the line impedance calculation unit 300, including time information and position information of the moving vehicle.

The line impedance calculation unit 300 synchronizes information measured through the substation measurement unit 100 and the vehicle measurement unit 200 according to time information to calculate substation impedance and vehicle impedance based on the synchronized information, 1, the synchronization module 310, the substation impedance calculation module 320, the vehicle impedance calculation module 330, and the line impedance calculation module 340, as shown in FIG. 1, .

Specifically, the synchronization module 310 receives information measured through the substation measurement unit 100 and the vehicle measurement unit 200 based on the time information transmitted from the substation measurement unit 100 and the vehicle measurement unit 200, Synchronize accordingly.

The substation impedance calculation module 320 calculates substation impedance based on the synchronized information.

The vehicle impedance calculation module 330 calculates the vehicle impedance based on the synchronized information.

The line impedance calculation module 340 finally calculates the line impedance per distance.

The protective relay for protecting the power supply circuit installed in the existing substation is installed separately in the up line and down line to protect the up line and the down line respectively and does not exchange information between the up line protection relay and the down line protection relay. However, in the case of a double-tracked double-track line, which is applied in Korea, even if there is a vehicle on the upcoming line, a current flows in the downward line due to the picking up of the line. Therefore, the calculation method of the line impedance varies depending on the configuration of the feeding system.

Hereinafter, a method of calculating the impedance to the catenary based on the above-described method will be described.

① Single wire system

When the vehicle impedance calculated from the voltage and current measured in the vehicle is subtracted from the substation impedance calculated from the voltage and current measured in the substation in the single wire system, the line impedance according to the position can be calculated.

Referring to Figure 2,

Loop ①:

Loop ②:

Loop ③:

Loop ④:

here,

[Equation 1]

Loop ①-Loop ②:

At this time, [Equation 1] = loop 3

If you assign the loop ④ to the loop ①,

로 나타낼 수 있다.:

.

here,

이며,

Lt;

이다.

to be.

Therefore, the substation impedance calculation module 320 calculates the substation impedance as shown in the following [Equation 2].

[Equation 2]

(25kV 기준)

(Based on 25kV)

Further, the vehicle impedance calculation module 330 calculates the vehicle impedance as shown in the following [Expression 3].

[Equation 3]

(25kV 기준)

(Based on 25kV)

Therefore, the line impedance calculation module 340 calculates the line impedance as a difference between the substation impedance calculated through the substation impedance calculation module 320 and the vehicle impedance calculated through the vehicle impedance calculation module 330 as shown in the following equation (4) , And the line impedance is calculated.

[Equation 4]

(25kV 기준)

(Based on 25kV)

② Double line system

 In the double line system, the feed line and the electric line of the up line and the down line are connected to the feed line in order to reduce the voltage drop of the feed line. As a result, when the vehicle is traveling on the uphill line, the load current flows not only in the uphill line but also in the downhill line due to the lateral waving phenomenon. Therefore, unlike the single wire system, the magnitude of the impedance measured in the vehicle is not proportional to the magnitude of the impedance measured in the upper line section of the substation.

3 shows a flow of current flowing in each of the power supply circuit sections when the vehicle is traveling on the up line in the double line system.

3,

In Fig. 3, the impedances measured in the up line and the down line are the same as in the following [Equation 5] and [Equation 6], and the impedance measured in the vehicle is expressed by the following [Equation 7].

That is, the substation impedance calculation module 320 calculates the impedance (based on 50 kV) of the substation upstream line section and calculates the impedance (based on 50 kV) of the substation downstream line section as shown in [Expression 5].

[Equation 5]

[Equation 6]

Further, the vehicle impedance calculation module 330 calculates the vehicle impedance (based on 50 kV) as shown in the following [Expression 7].

[Equation 7]

As shown in [Equation 5], the impedance measured in the upper section of the substation is not proportional to the impedance calculated from the vehicle current measured in the vehicle as a part of the current flowing in the vehicle flows into the down line.

Therefore, in order to accurately calculate the line impedance of the upcoming line irrespective of the size of the vehicle impedance, the vehicle impedance should be calculated using the current measured at the substation rather than the current measured in the vehicle at the time of vehicle impedance calculation.

[Equation 8]

here,

[Equation 9]

Accordingly, the line impedance calculation module 340 can calculate the line impedance per distance (50 kV reference) regardless of the vehicle impedance according to the running of the vehicle through Equation (9).

③ Simulation result of double line system

Simulation of real - time line impedance calculation method using synchronized power data between a moving vehicle and a substation was performed for the above two - wire system.

Fig. 4 is an example showing impedance magnitude (based on 50 kV) according to the distance seen from the substation, showing a typical nonlinear characteristic depending on the distance.

[Table 1] to [Table 3] indicate that 3km (30% of the distance between substation and auxiliary supply distances), 7km (30% of distances between substations and auxiliary supply distances), 15km And 50% of the distances of the distances).

[Table 1] 3 km (30% of the distance between Substation and Auxiliary Supply) Branch

[Table 2] 7 km (70% of the distance between substation and auxiliary supply)

[Table 3] 15 km (50% of the distance between the auxiliary power supply substation and the power supply)

As shown in the above simulation results, the line impedance at 3 km is 8.07Ω, the line impedance at 7km is 11.64Ω, and the line impedance at 15km is 20.03Ω, regardless of the vehicle impedance.

Meanwhile, the real-time line impedance calculation system (S) using the synchronized power data between the running vehicle and the substation according to the present invention has a characteristic advantage of correcting the high-reliability facial expression apparatus through interlocking with the high- have.

5 is a diagram illustrating an example of interconnection between a line impedance calculating unit and a conventional high-strength facial expression apparatus. As shown in the figure, a line impedance measurement value according to a distance in real time is interlocked with a reactance- And it is possible to predict changes in line conditions such as line wear due to line impedance change.

6 is a diagram illustrating an example in which a real-time line impedance calculation system S using synchronized power data between a running vehicle and a substation according to the present invention is applied. As shown in the figure, a substation for measuring substation power data A vehicle measurement section 200 for measuring the voltage and current of the vehicle is installed in the vehicle for measuring the vehicle impedance and the line impedance calculation section 300 can be installed in a substation or a remote place.

While the present invention has been particularly shown and described with reference to preferred embodiments thereof, 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. It will be appreciated by those skilled in the art that numerous changes and modifications may be made without departing from the invention. Accordingly, all such appropriate modifications and changes, and equivalents thereof, should be regarded as within the scope of the present invention.

S: Real-time line-to-line impedance calculation system using synchronized power data between a moving vehicle and a substation
100: substation measuring unit 200: vehicle measuring unit
300: Line impedance calculating unit 310: Synchronization module
320: Substation impedance calculation module 330: Vehicle impedance calculation module
340: Line Impedance Calculation Module

Claims (5)

A substation measuring unit 100 for measuring the voltage information of the feeding bus, the current information of the electric line and the feeder line of the up / down line, and transmitting the measured voltage and current information and the time information to the line impedance calculating unit 300;
A vehicle measurement unit 200 for measuring voltage and current information of the vehicle, transmitting the measured voltage and current information, and time information and position information of the moving vehicle to the line impedance calculation unit 300; And
A line for calculating the impedance of the substation and the vehicle impedance on the basis of the synchronized information and calculating the final line impedance for each distance by synchronizing the information measured through the substation measurement unit 100 and the vehicle measurement unit 200 according to the time information, An impedance calculating unit 300; , ≪ / RTI &
The line impedance calculating unit 300 calculates the line impedance,
A synchronization module 310 for synchronizing the information measured through the substation measurement unit 100 and the vehicle measurement unit 200 with time based on the time information transmitted from the substation measurement unit 100 and the vehicle measurement unit 200;
A substation impedance calculation module 320 for calculating a substation impedance based on the synchronized information;
A vehicle impedance calculation module 330 for calculating a vehicle impedance based on the synchronized information; And
A line impedance calculation module 340 for finally calculating a line impedance per distance; And a second electrode,
The line impedance calculation module 340 calculates a line impedance as a difference between the substation impedance calculated through the substation impedance calculation module 320 and the vehicle impedance calculated through the vehicle impedance calculation module 330 in the single line system And calculating a real time line impedance calculation system using the synchronized power data between the running vehicle and the substation.
delete delete The method according to claim 1,
The vehicle impedance calculation module 330,
In order to accurately calculate the line impedance of the up line regardless of the size of the vehicle impedance in the up line system of the up line and down line tie-up tie system, the vehicle impedance is calculated by using the current measured in the substation, And calculating an impedance of the transformer based on the calculated power data.
The method according to claim 1,
The line impedance calculation module 340,
Wherein the line impedance is calculated for each distance regardless of the vehicle impedance of the vehicle.

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