JP2008221898A - Feeding control device and feeding switching method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To safely and surely determine whether a switch is parallel-turned when two different power source feeding lines are parallel-connected by parallel-turning two switches in a switch section of a feeling line of a feeding section. <P>SOLUTION: A voltage Vs between a feeding line of a power source A and a feeding line of a power source B is measured in a switch section, and network impedance between the feeding line of the power source A and the feeding line of the power source B is calculated. Then, a prediction current value I flowing in the switch when the switch is parallel-turned is calculated based on the voltage difference Vs and the network impedance. Also, a current flowing in the switch when the switch is parallel-turned while there is no voltage difference and no phase difference between the feeding line of the power source A and the feeding line of the power source B is calculated based on the network impedance, and designated as a reference current value Is. Whether the switch is parallel-turned or not is determined based on the prediction current value I and the reference current value Is. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a feeding control device for controlling a switching switch for switching a power supplied to a train entering the switching section to a different power in a switching section of a feeding section provided between different feeding sections. And a feeding switching method in the feeding control apparatus.

  In the electric railway of the AT AC feeding system, there is a part where a feeder that supplies electric power from a substation to a train is switched to a feeder from another substation or a switch. A switching section is provided for switching such feeders.

  FIG. 11 is a diagram for explaining a switching section of a feeding section in an electric railway. 11B, 11C, and 11D are diagrams for explaining the switch operation in the switching section.

  In FIG. 11, 2 is a feeder connected to the power source A of the A substation, 3 is a feeder connected to the power source B of the B substation, 4 is a rail, and 11 and 12 supply power to the train 21. A switch for switching feeders (for example, a vacuum switch), 13 and 14 are air sections (sections in which two overhead lines are arranged side by side), 15 is an intermediate section, and 21 is a train. The feeding control device 10 is a device that performs switching control of the switching switches 11 and 12.

  Then, as shown in the example of FIG. 11A, the switching section 1 includes a feeder 2 that supplies power from the A substation as the power source A, and a feeder 3 that supplies power as the power source B from the B substation. It is provided at the switching feeder section.

  In the above configuration, FIG. 11B shows the open / close state of the switching switch when the train 21 is traveling in the section of the feeder line 2. In this state, the switching switch 11 is “ON” and the switching switch 12 is “OFF”. Therefore, the intermediate section 15 in the switching section 1 is in a state of being fed by the feeder line 2 of the power source A.

  FIG. 11C shows the open / close state of the switching switch when the train 21 enters the switching section 1. In this state, the switching switch 11 is switched from “ON” to “OFF”, and the switching switch 12 remains “OFF”. Therefore, the intermediate section 15 in the switching section 1 is temporarily in a power failure state.

  FIG. 11D shows the open / close state of the switching switch when the train 21 enters the switching section 1 and approaches the air section 14. In this state, the switching switch 11 remains “OFF”, and the switching switch 12 is switched from “OFF → ON”. Accordingly, the intermediate section 15 in the switching section 1 is fed by the feeder line 3 of the power source B.

  When the switching of feeders in the switching section 1 is completed by the above procedure and the train 21 moves to the section of the feeder 3, the switching states of the switching switches 11 and 12 in the switching section 1 are as shown in FIG. To recover.

  The temporary power failure time of the intermediate section 15 described above is usually about 0.3 seconds. For this reason, the conventional switching method mentioned above is called 0.3 second power failure switching.

By the way, when switching to feeders by the above-mentioned method, a temporary power failure of about 0.3 seconds occurs, the main converter (converter or inverter, etc.) of the train is temporarily stopped, and the train air conditioner etc. Stop. For this reason, it is necessary to restart these devices , and there is a problem that this restart takes time. In addition, the occurrence of surge voltage due to the opening and closing of the switching switch may have a noise effect on the equipment in the train.

  In addition, after the power failure was restored, the magnetizing inrush current flowed to the main transformer (receiving transformer) in the train, which could cause unnecessary operation of the protective relay and stress the power equipment. Of course, for safety reasons, the equipment in the train is designed to withstand the noise and stress, but it is best to prevent the noise and stress from occurring. If the generation of noise and stress can be reduced, the burden on equipment in the train can be reduced and the cost can be reduced. For this reason, it has been desired to suppress the generation of the noise and stress.

  In order to deal with such a problem, a feeding switching control device of the prior art has been disclosed (see Patent Document 1). An object of the prior art feeder switching control device is to provide a feeder switching control device that improves the ride comfort of passengers without shocking the electrical equipment mounted on the train.

The outline of the configuration of this conventional feeder switching control apparatus will be described with reference to FIG. 11. In the feeder switching control apparatus, only the switching switch 11 is turned on when the train 21 has not passed through the intermediate section 15. The power is supplied to the intermediate section 15. When the train 21 passes through the intermediate section 15 and there is no fear of overcurrent when the feeders 2 and 3 are connected, the two switches are opened and closed for a predetermined period after the entire train 21 enters the intermediate section 15. The devices 11 and 12 are turned on, and power is supplied from the feeders 2 and 3 to the intermediate section 15 (parallel feeding). After a predetermined period, only the switching switch 12 is turned on, and power is supplied from only the power source B to the intermediate section 15. In this case, since there is no power failure at the time of power switching, the electric equipment mounted on the train is not shocked and the acceleration is not interrupted even during train power running, so that the ride comfort is improved.
JP 2000-203316 A

  However, in the above-described feeder switching control device of the prior art, when determining whether or not parallel feeding of the feeders of two different power sources (parallel feeding by a switching switch) is possible, a voltage that is simply the scalar amount of both power sources. The difference (absolute value difference) and phase difference are determined by comparing with a predetermined value (threshold value, empirical value), and the relationship between the voltage difference (absolute value difference) and phase difference and the overcurrent value is clear. Was not shown.

  In order to actually perform parallel feeding, the current value at the time of parallel circuit is predicted based on the voltage and phase of the actual feeding system and the network impedance of the feeding system, and this predicted value is obtained. It is necessary to determine whether or not switching can be performed safely. However, in the above-described conventional power feeding switching control device, this point is not taken into consideration, and a system that can perform parallel charging (parallel feeding) safely and reliably. It was difficult.

  The present invention has been made to solve such a problem, and the object thereof is to connect two different power feeders in parallel by switching in two switching switches in parallel in a feeder switching section in an electric railway. When predicting the current value flowing through the switching switch, it is possible to safely and reliably determine whether or not the switching switch can be turned on in parallel according to the predicted current value, and two switching switches It is an object of the present invention to provide a feeding control device and a feeding switching method that can perform parallel feeding only by opening and closing one of them.

The present invention has been made to solve the above problems, and the feeder control device of the present invention includes a feeder line of a power source A of an A substation (ASS) of an AC electric railway using an AT AC feeder system. In the switching section provided in the feeder section (SP) between the feeder B of the power source B of the B substation (BSS) different from the A substation (ASS), it is insulated from the both feeders. A first switching switch for connecting or opening the feeder line of the power source A and the intermediate section to the intermediate section formed; and for connecting or releasing the feeder line of the power source B and the intermediate section. A feeder control device for controlling the second switching switch of the power supply A, wherein, in the switching section, a predetermined portion including at least the voltage of the feeder line of the power source A and the voltage of the feeder line of the power source B Measure voltage and current Measuring means for calculating the network impedance as seen from between the feeder line of the power source A and the feeder line of the power source B of the feeder section (SP), and the measurement On the basis of the voltage difference between the feeder line of the power source A and the feeder line of the power source B measured by the means and the network impedance, the second switching switch is turned on. Based on the value of the predicted current value I, the predicted current value calculation means for calculating the predicted current value I flowing through the second switching switch when the switching switch is turned on in parallel, the first switching switch A parallel on / off availability determining means for determining whether or not the second switching switch can be turned on in parallel in a state where the switch is in the on state, and when the parallel turning on / off determining means determines that parallel turning on is possible When the first switch is in the “ON” state The second switching switch is turned on in parallel for a predetermined time, and the second control switch is controlled by receiving a detection signal indicating “present” or “none” of the presence of the train from the track circuit (for detecting the train position). And a switching switch control means for returning the switching switch to “OFF”.
With such a configuration, the voltage difference Vs between the feeder line of the power source A and the feeder line of the power source B is measured in the switching section in the feeder section, and viewed from the feeder section (SP). The network impedance Z between the feeder line of the power source A and the feeder line of the power source B is calculated. Based on the voltage difference Vs and the network impedance Z, the predicted current that flows through the second switching switch when the second switching switch is turned on in parallel while the first switching switch is “ON”. The value I is calculated. Based on the predicted current value I, it is determined whether or not parallel charging is possible.
Thereby, different feeder power supplies can be turned on in parallel with high safety. Therefore, it is not necessary to stick to instantaneous parallel input of 0.3 seconds as in the prior art, and for example, parallel switching can be performed in a long time of 30 seconds to 1 minute. Thus, the feeder can be switched by one switch.

Further, the feeder control device of the present invention assumes that there is no voltage difference and phase difference between the feeder line of the power source A and the feeder line of the power source B, and the first switching switch is “on”. Assuming that the second switching switch is turned on in parallel, the current flowing through the second switching switch is calculated based on the network impedance, and the calculated current value is the reference current value. Based on the reference current value calculation means for Is, the predicted current value I and the reference current value Is, the second switching switch is turned on in parallel when the first switching switch is in the “ON” state. Parallel availability determination means for determining whether it can be performed or not.
With such a configuration, it is assumed that there is no voltage difference and phase difference between the feeder line of the power source A and the feeder line of the power source B, and the first switching switch and the second switching switch are put in parallel. In addition, the current flowing through the second switching switch is calculated based on the network impedance, and is set as the reference current value Is. Then, based on the predicted current value I and the reference current value Is, it is determined whether or not the second switching switch can be turned on in parallel.
Thereby, different feeder power supplies can be turned on in parallel with high safety. Therefore, it is not necessary to stick to instantaneous parallel input of 0.3 seconds as in the prior art, and for example, parallel switching can be performed in a long time of 30 seconds to 1 minute. Thus, the feeder can be switched by one switch.

In the power feeding control device of the present invention, the predicted current value I is smaller than a predetermined threshold value α1, and the difference between the predicted current value I and the reference current value Is is smaller than a predetermined threshold value α2. In addition, it is characterized in that it includes a parallel on / off availability determining means for determining that the second switching switch can be turned on in parallel when the first switching switch is in the “on” state.
With such a configuration, the second switching is performed only when the predicted current value I is smaller than the predetermined threshold value α1 and the difference between the predicted current value I and the reference current value Is is smaller than the predetermined threshold value α2. Switch in parallel. For example, the upper limit current flowing in the switching switch is set as the threshold value α1, and the upper limit value of the cross current is set as the threshold value α2.
Thereby, different feeder power supplies can be turned on in parallel with high safety. Therefore, it is not necessary to stick to instantaneous parallel input of 0.3 seconds as in the prior art, and for example, parallel switching can be performed in a long time of 30 seconds to 1 minute. Thus, the feeder can be switched by one switch.

In addition, the feeding control device according to the present invention is configured such that when the parallel switching availability determination unit determines that the first switching switch cannot be switched in parallel, the first switching switch and the second switching switch. By turning off both of the switching switches and temporarily turning off the intermediate section, and then turning on the second switching switch, the feeder for supplying power to the train can be switched to the feeder of the power source A. From the power source B to the feeder line.
With such a configuration, when it is determined that the first switching switch and the second switching switch cannot be turned on in parallel, the conventional switching method for temporarily stopping the intermediate section (0.3 second power failure switching) Select.
Thereby, when parallel injection cannot be performed, the conventional switching method can be used.

In addition, the feeder control device according to the present invention is configured so that when the network impedance between the power supply A feeder and the power supply B feeder is calculated by the network impedance calculation means, It is calculated by including the impedance of the train that is running in the approached state.
With such a configuration, when the network impedance is calculated, it is calculated including the train impedance. As a result, the network impedance can be calculated more accurately, and the accuracy of the predicted current value I and the reference current value Is increases.

In addition, the feeder control device of the present invention is configured such that, when a single turn transformer (AT) is installed in the feed section, the suction current flowing through the single turn transformer is based on the wire voltage and the wire voltage. It is characterized by obtaining train impedance.
With such a configuration, and it calculates the train impedance based on line voltage when wicking current autotransformer which is equipment feeding circuit section post (AT). Thereby, the train impedance can be easily obtained.

In addition, the feeder control device of the present invention calculates Z = [Z _CA × (Z _0A + Z _TA + Z _FA) when obtaining the network impedance Z between the feeder of the power source A and the feeder of the power source B. _{) / (Z 0A + Z TA} + Z FA + Z CA)] + [Z CB × (Z 0B + Z TB + Z FB) / (Z 0B + Z TB + Z FB + Z CB)], _{where, Z 0A:} A substation (ASS ) Three-phase impedance from the power receiving point, Z _TA : Leakage impedance of feeder transformer of A substation (ASS), Z _FA : Between A substation (ASS) and feeder section (SP) Impedance of electric circuit, Z _CA : Impedance of train on A substation (ASS) side near feeder section (SP), Z _0B : Impedance on three phases from receiving point of B substation (BSS), Z _TB: B substation (B S) eaves leakage impedance of electric _{transformers, Z FB:} impedance of the feeding circuit circuit between B substation (BSS) ~ feeding circuit section post _{(SP), Z CB:} feeding circuit section post (SP) near the B The estimated current value I is obtained as I = Vs / Z based on the voltage difference Vs between the feeder line of the power source A and the feeder line of the power source B. It is characterized by that.
With such a configuration, the equivalent circuit of the circuit network is created by individually obtaining the impedance of the receiving side of the substation, the impedance of the feeding transformer, the impedance of the feeding circuit, and the train impedance.
Thereby, an equivalent circuit of the circuit network can be obtained easily and accurately.

In the feeder control device of the present invention, the feeder A of the feeder A of the feeder section is provided with the autotransformer AT1, and the feeder of the power supply B is provided with the transformer AT3. When the autotransformer AT2 is provided on the feeder line of the power source A on the line side, and the autotransformer AT4 is provided on the feeder line of the power source B, the suction current I _AT1 of the autotransformer _AT1 ; wherein the wicking current _{I AT2} of autotransformer AT2, wherein the wicking current _{I AT3} of autotransformer AT3, wherein the wicking current _{I AT4} the autotransformer AT4, source a eaves voltage of the wire V _{The SPA} and the voltage V _{SPB of the} feeder line of the power source B are measured, and the train impedance Z _CA on the A substation (ASS) side is obtained by Z _CA = 0.92 × V _SPA / (I _AT1 + I _AT2 ) the B substation (BSS) side of the train impedance _{Z CB , Z CB = 0.92 × V SPB} / (I AT3 + I AT4), and obtaining at.
With such a configuration, the feeder A of the feeder A in the feeder section is provided with the autotransformer AT1, the transformer A3 of the feeder of the power source B is provided, and the power source A is also provided on the opposite line side. When the winding transformer AT2 is provided on the feeder wire and the winding transformer AT4 is provided on the feeder wire of the power source B, the feeder wire side of the power source A is based on the suction current flowing through each of the transformer transformers. And the train impedance on the feeder side of the power source B are calculated.
Thereby, the train impedance of each feeder side can be easily obtained.

In the feeder control device of the present invention, the feeder A of the feeder A of the feeder section is provided with the autotransformer AT1, and the feeder of the power supply B is provided with the transformer AT3. When the autotransformer AT2 is provided for the feeder line of the power source A on the line side and the autotransformer AT4 is provided for the feeder line of the power source B, the suction current I _AT1 of the autotransformer _AT1 is the a suction current _{I AT2} of autotransformer AT2, wherein the wicking current _{I AT3} of autotransformer AT3, and measuring the wicking current _{I AT4} of the autotransformer AT4, the reference current value Is, Is = [Z _A × (I _{AT1 + 2} ) −Z _B (I _{AT3 + 4} )] / [0.92 × (Z _A + Z _B )], where Z _A = (Z _0A + Z _TA + Z _FA ), Z _B = (Z _0B + Z _TB + Z _FB ), I _{AT1 + 2} = (I _AT1 + I _AT2 ), _{IAT3 + 4} = ( _IAT3 + _IAT4 ).
With such a configuration, the feeder A of the feeder A in the feeder section is provided with the autotransformer AT1, the transformer A3 of the feeder of the power source B is provided, and the power source A is also provided on the opposite line side. When the winding transformer AT2 is provided for the feeder line and the winding transformer AT4 is provided for the feeder line of the power source B, the reference current value Is is obtained as the impedance on the power receiving side of the substation, the feeder transformer. The impedance is calculated based on the impedance of the power supply circuit, the impedance of the feeder circuit, and the suction current flowing through each autotransformer.
Thereby, the reference current value Is can be obtained easily and accurately.

In addition, the feeder switching method of the present invention includes a feeder line of a power source A of an A substation (ASS) of an AC electric railway using an AT AC feeder system, and a B substation different from the A substation (ASS). (BSS) In the switching section provided in the power distribution section (SP) between the power supply B and the power supply B, the power supply A power supply wire is connected to the intermediate section provided insulated from the both power supply wires. A control switch for controlling a first switching switch for connecting or opening the intermediate section and a second switching switch for connecting or opening the feeder line of the power source B and the intermediate section. A feeding switching method in a power control device, wherein a control unit in the power feeding control device includes at least a voltage of a feeder line of the power source A and a voltage of a feeder line of the power source B in the switching section. Part voltage and current A measurement procedure for measuring, and a network impedance calculation procedure for calculating a network impedance as seen from between the feeder line of the power source A and the feeder line of the power source B of the feeder section (SP), Based on the voltage difference between the feeder line of the power source A and the feeder line of the power source B and the network impedance measured by the measurement procedure, the first switching switch is in the “ON” state. When the two switching switches are turned on in parallel, the predicted current value calculation procedure for calculating the predicted current value I flowing in the second switching switch and the predicted current value I are used to calculate the first current It is determined that the parallel switching can be performed by the parallel switching availability determination procedure for determining whether or not the second switching switch can be switched in parallel with the switching switch in the “ON” state, and the parallel switching permission determination procedure. If the first switching switch is “ON” In the state, the second switching switch is turned on in parallel for a predetermined time, and a control signal is supplied from the track circuit (for detecting the train position) to indicate whether there is a train or not. And a switching switch control procedure for returning the second switching switch to “OFF”.
By such a method, the voltage difference Vs between the feeder line of the power source A and the feeder line of the power source B is measured in the switching section in the feeder section, and the power source A of the feeder section (SP) is also measured. The network impedance Z seen from between the feeder wire and the feeder wire of the power source B is calculated. Based on the voltage difference Vs and the network impedance Z, the predicted current that flows through the second switching switch when the second switching switch is turned on in parallel while the first switching switch is “ON”. The value I is calculated. Based on the predicted current value I, it is determined whether or not parallel charging is possible.
Thereby, different feeder power supplies can be turned on in parallel with high safety. Therefore, it is not necessary to stick to instantaneous parallel input of 0.3 seconds as in the prior art, and for example, parallel switching can be performed in a long time of 30 seconds to 1 minute. Thus, the feeder can be switched by one switch.

In addition, the feeder switching method of the present invention assumes that there is no voltage difference and phase difference between the feeder line of the power source A and the feeder line of the power source B, and the first switching switch is “on”. Assuming that the second switching switch is turned on in parallel, the current flowing through the second switching switch is calculated based on the network impedance, and the calculated current value is the reference current value. Based on the reference current value calculation procedure for Is and the predicted current value I and the reference current value Is, the second switching switch is turned on in parallel while the first switching switch is in the “ON” state. And a parallel insertion permission / inhibition determination procedure for determining whether or not it is possible to perform.
When it is assumed that there is no voltage difference and phase difference between the feeder line of the power source A and the feeder line of the power source B by such a method, and the first switching switch and the second switching switch are put in parallel. In addition, the current flowing through the second switching switch is calculated based on the network impedance, and is set as the reference current value Is. Then, based on the predicted current value I and the reference current value Is, it is determined whether or not the second switching switch can be turned on in parallel.
Thereby, different feeder power supplies can be turned on in parallel with higher safety. Therefore, it is not necessary to stick to instantaneous parallel input of 0.3 seconds as in the prior art, and for example, parallel switching can be performed in a long time of 30 seconds to 1 minute. Thus, the feeder can be switched by one switch.

In the feeding switching method of the present invention, the predicted current value I is smaller than a predetermined threshold value α1, and the difference between the predicted current value I and the reference current value Is is smaller than a predetermined threshold value α2. Only, it is characterized in that it includes a parallel on / off enabling determination procedure for determining that the second switching switch can be turned on in parallel while the first switching switch is in the “ON” state.
By such a method, the second switching is performed only when the predicted current value I is smaller than the predetermined threshold value α1 and the difference between the predicted current value I and the reference current value Is is smaller than the predetermined threshold value α2. Switch in parallel. For example, the upper limit current flowing in the switching switch is set as the threshold value α1, and the upper limit value of the cross current is set as the threshold value α2.
Thereby, different feeder power supplies can be turned on in parallel with high safety. Therefore, it is not necessary to stick to instantaneous parallel input of 0.3 seconds as in the prior art, and for example, parallel switching can be performed in a long time of 30 seconds to 1 minute. Thus, the feeder can be switched by one switch.

In addition, in the power feeding switching method of the present invention, when the parallel switching availability determination unit determines that the first switching switch cannot be switched in parallel, the first switching switch and the second switching switch By turning off both of the switching switches and temporarily turning off the intermediate section, and then turning on the second switching switch, the feeder for supplying power to the train can be switched to the feeder of the power source A. Including a procedure for switching from a feeder to the feeder of the power source B.
When it is determined by such a method that the first switching switch and the second switching switch cannot be turned on in parallel, the conventional switching method for temporarily stopping the intermediate section is selected.
Thereby, when parallel injection cannot be performed, the conventional switching method can be used.

  In the feeding control device of the present invention, in the switching section in the feeding section, when the power of different feeders is switched on in parallel by the switching switch, the current value flowing through the switching switch is predicted. Thereby, different feeder power supplies can be turned on in parallel with high safety. Therefore, it is not necessary to stick to instantaneous parallel input of 0.3 seconds as in the prior art, and for example, parallel switching can be performed in a long time of 30 seconds to 1 minute. This makes it possible to switch feeders using only one switch.

Next, the best mode for carrying out the present invention will be described with reference to the drawings.
The feeder control device of the present invention performs switching of feeders in feeder divisions (SP) where the voltage difference / phase difference between different power sources is small by temporarily connecting feeders of different power sources in parallel. Is.

(Description of feeder switching method in feeder control device of the present invention)
FIG. 1 is a diagram showing an example of a switching method of a feeding control device according to the present invention. In the power feeding control device of the present invention, as shown in FIG. 1A, a parallel circuit is used for a short time (for example, about 0.3 seconds to 1 minute) using two switching switches 11 and 12. And a switching method using only one switching switch 12 as shown in FIG. The method shown in FIG. 1 (A) is the same method as that of the prior art feeding switching control device (the method of Patent Document 1) described above, but in the present invention, the switching switches 11 and 12 are arranged in parallel. The determination of whether or not the charging is possible is based on the voltage, phase, and network impedance of the actual feeder system, and the difference is that parallel charging can be performed safely and reliably.

Since the switching method of FIG. 1 (A) has already been described, only the switching method of FIG. 1 (B) will be described.
Referring to FIG. 1B, FIG. 1A shows the open / close state of the switching switch when the train 21 runs on the section of the feeder line 2. In this state, the switching switch 11 is always “ON” and the switching switch 12 is “OFF”. Therefore, the intermediate section 15 in the switching section 1 is in a state of being powered only by the power source A.

  FIG. 2B shows the open / close state of the switching switch when the train 21 enters the switching section 1. In this state, the switching switch 11 is always “ON”, and the switching switch 12 is also “ON”. Therefore, the intermediate section 15 in the switching section 1 is in a state of being electrically fed in parallel from the feeder lines 2 and 3.

  FIG. 3 shows the switching state of the switching switch when the train 21 passes through the switching section 1. In this state, the switching switch 11 always remains “ON”, and the switching switch 12 is switched from “ON → OFF”. Accordingly, the intermediate section 15 in the switching section 1 is powered only by the power source A.

  According to the above procedure, in the switching section 1, switching of feeders can be performed by the switching operation of only the switching switch 12 without causing the intermediate section 15 to be temporarily interrupted.

(Explanation about the current that flows through the switch when there is no cross current)
FIG. 2 is a diagram for explaining a cross current that flows during parallel charging (parallel feeding) by a switching switch, and shows an equivalent circuit between an A substation (ASS) and a B substation (BSS). .

  In the present invention, the current flowing through the switching switch when the switching switch is turned on (in parallel) under the condition that there is no cross current between the substations (current flowing due to the voltage difference and phase difference of different power sources). The value is set as the reference current value Is, and the predicted current value I of the current that actually flows when the current is applied in parallel based on the voltage difference and phase difference between the different power sources and the reference current value Is are compared to determine whether parallel application is possible.

As shown in FIG. 2A, depending on the load conditions and circuit conditions on the three-phase side, a difference occurs between the voltage / phase of the A substation (ASS) and the voltage / phase of the B substation (BSS). Therefore, a voltage difference and a phase difference are generated between both ends of the switching switch connected to the A substation (ASS) side and the B substation (BSS) side. Switching the switching switch 12 to "ON" in this state, as shown in FIG. 2 (B), through lateral flow I _B.

  Conversely, if the voltage / phase of the A substation (ASS) matches the voltage / phase of the B substation (BSS), it can be considered that the influence of the load on the three-phase side is small, so the A substation (ASS) An equivalent circuit between the B substations (BSS) can be expressed as shown in FIG. At this time, there is no voltage difference or phase difference between the different power sources when the switching switch 12 is opened, and a cross current flows between the different power sources even if the switching switch 12 is turned on and the power sources are connected in parallel as shown in FIG. Absent.

In FIG. 3 (A), feeding circuit section post (SP) viewed from A substation (ASS) side of the impedance _Z A, B substation (BSS) of the side impedance and _{Z B,} feeding circuit section post (SP just below ), The equivalent circuit at that time is as shown in FIG. 4, and the current supplied to the train from the B substation (BSS) flows through the switching switch 12. The current value is given by equation (1).

Since the current value obtained by equation (1) is the current value that flows through the switching switch 12 under the condition that the voltage and phase of the A substation (ASS) and the B substation (BSS) match, this is input in parallel. A reference current value Is used for determination of availability is used. That is, the current value I _B (reference current value Is) obtained by the equation (1) is compared with the predicted current value I calculated from the voltage difference between different power sources described later to determine whether parallel charging is possible.

(Explanation about the prediction method of the current flowing through the switching switch)
Next, a method for predicting the current flowing through the switching switch 12 will be described below.
When a short circuit between two points on the network, the current flowing between the two points is the voltage Vs between the two points when the two points are open, with the impedance Z of the circuit network seen from the two points. The divided value.

  Therefore, when the equivalent circuit between the A substation (ASS) and the B substation (BSS) is considered as shown in FIG. 5, the impedance Z of the circuit network viewed from the feeder section (SP) is expressed by the following equation (2): The current that flows through the switching switch 12 when the switching switch 12 is turned on is expressed by equation (3).

Each impedance shown in FIG.
Z _0A : three-phase impedance viewed from the ASS power receiving point,
Z _TA : Leakage impedance of feeding transformer of A substation (ASS),
Z _FA : impedance of feeder circuit between A substation (ASS) and feeder section (SP),
Z _CA : Impedance of the train near the A substation (ASS) near the feeder section (SP),
Z _0B : Impedance on the three-phase side viewed from the receiving point of B substation (BSS),
Z _TB : Leakage impedance of feeder transformer of B substation (BSS),
Z _FB : impedance of feeder circuit between B substation (BSS) and feeder section (SP),
_ZCB : Impedance of the train on the B substation (BSS) side near the feeder section (SP),
V _SPA : Feeding voltage on the A substation (ASS) side of feeding section (SP),
V _SPB : _Feeding voltage on the B substation (BSS) side of the _feeding section (SP).

  Although the line impedance and the leakage impedance of the feeder transformer can be obtained in advance by calculation or actual measurement, since the train impedance changes depending on the running state, it is necessary to obtain the value immediately before the switching switch 12 is turned on. The train impedance can be obtained from the train voltage and the train current, but it is difficult to accurately grasp this at the feeder section (SP).

  However, in the case of the AT AC feeding system as shown in FIG. 6, when traveling under the train feeding section (SP), 92% of the train current (experience value) is a single turn of the feeding section (SP). Since it is sucked up by a transformer (AT: Auto Transformer), this can be regarded as a train current. Moreover, the feeder voltage of the feeder section (SP) can be regarded as the train voltage.

However, as shown in FIG. 7, since the feeder line is normally connected at the feeder section (SP), the train current is generated by two single-turn transformers (upward and downstream) ( AT1 and AT2) and two single-winding transformers (AT3 and AT4), and the total of _{IAT1 + 2} (the sum of _IAT1 and _IAT2 ), _{IAT3 + 4} ( _IAT3) And _IAT4 ) corresponds to the train current.

Therefore, if the feeder voltage of the feeder section (SP) is V _SPA and V _SPB , the train impedances Z _CA and Z _CB are expressed by the equations (4) and (5). The train impedance obtained by this method seems to be larger than the actual distance as the train leaves the service station (SP), but this phenomenon becomes smaller as the train impedance moves away from the service station (SP). Matches.

  From the above, using the line impedance that can be obtained in advance and the leakage impedance of the feeder transformer and the train impedance obtained from the expressions (4) and (5), the feeding section ( SP), the impedance Z of the network can be obtained, and by dividing the voltage difference Vs between different power sources by the network impedance Z, the current flowing to the switching switch when the switching switch is turned on is predicted. Can do.

The procedure for calculating the predicted current value I flowing through the switching switch described above is summarized below.
As procedure (1), the impedance of the train is calculated from the suction current of the autotransformer (AT) of the feeder of the feeder section (SP).

  As procedure (2), the impedance of the circuit network as seen from the feeder section (SP) is calculated.

  As the procedure (3), the current value flowing through the switching switch is predicted from the voltage difference Vs between different power sources at the feeding section (SP) and the network impedance Z calculated by the equation (2).

(Description of determination method for parallel switching)
Next, a method for determining whether parallel switching is possible will be described.
If the cross current is large, the operation of the failure selection relay (50F) and the distance relay (44F) may be affected. Therefore, it is desirable not to perform the parallel switching when it is predicted that the cross current when the switching circuit is turned into a parallel circuit is larger than the threshold value. The fault selection relay is a protective relay that detects short-circuit faults, detects the amount of increase in current, and operates when the value exceeds the set value.The distance relay starts from the feeding voltage and feeding current. This is a protective relay that operates when the impedance is detected and this impedance is smaller than a predetermined value.

Two predicted current value I calculated by the the Without voltage and phase differences between the feeder line (1) with the current value I _B was determined (3) is substantially equal, A if the voltage and phase difference The difference between the reference current value Is and the predicted current value I increases due to the influence of the cross current between the substation (ASS) and the B substation (BSS). Conceivable. Therefore, it is possible to determine whether parallel switching is possible based on the difference between the reference current value Is and the predicted current value I.

  In the equation (1) for obtaining the reference current value Is, the train current is calculated assuming that the train current is known and only on the A substation (ASS) side of the train feeding station (SP), but the AT suction current is used as the train current. If it is assumed that the train having a load current substantially equal to the AT suction current is located immediately below the A substation (ASS) side and the BSS side of the distribution station (SP), the equivalent circuit is as shown in FIG.

In FIG. 8, I _CA and I _CB are as shown in the following formulas (6) and (7).

  Further, from FIG. 8, the equation (8) is established.

Note that Z _A = (Z _0A + Z _TA + Z _FA ), Z _B = (Z _0B + Z _TB + Z _FB ).

  The current (reference current value Is) flowing through the switching switch 12 is expressed by equation (9).

  Substituting equation (8) into equation (9) and rearranging results in equation (10).

  Substituting the formulas (6) and (7) into the formula (10) and rearranging them gives the formula (11).

  The current (reference current value Is) calculated by the equation (11) is a current that flows through the switching switch when there is no cross current. Therefore, the difference between the current (reference current value Is) calculated by equation (11) and the predicted current value I obtained by equations (4), (5), (2), and (3) is the magnitude of the cross current. And can be used as an element for determining whether or not parallel loading is possible.

  FIG. 9 shows an algorithm for determining whether or not parallel switching is possible. In the algorithm of FIG. 9, two threshold values α1 and α2 are provided. α1 is an upper limit value of the current flowing through the switching switch, and α2 is an upper limit value of the cross current. Hereinafter, with reference to FIG. 9, the procedure of the parallel switching availability determination process will be described.

  First, it is determined whether a train has entered the switching section (step S1). If the train has not entered (step S1: NO), it waits until the train enters.

If it is determined in step S1 that the train has entered the switching section (step S1: YES), the voltage of the feeder is measured. That is, the feeder voltage _VSP is measured, the voltage difference Vs between different power sources is measured, and the AT suction currents _{IAT1 + 1} and _{IAT3 + 4} are measured (step S2).

Next, the predicted current value I is calculated by the equations (4), (5), (2), and (3) (step S3).
Then, the current (reference current value Is) flowing through the switching switch when there is no cross current is calculated (step S4).

  Then, it is determined whether or not the predicted current value I is equal to or less than a predetermined threshold value α1 (I <α1) (step S5). If “I> α1” (step S5: NO), the same 0.3 second power failure switching as in the prior art is performed (step S6).

  If “I <α1” (step S5: YES), then the absolute value of the difference (I−Is) between the predicted current value I and the reference current value Is is equal to or smaller than a predetermined threshold value α2 (| I−Is |). It is determined whether or not <α2) is satisfied (step S7). If “| I−Is |> α2” (step S7: NO), the same 0.3 second power failure switching as in the conventional case is performed (step S6).

  If “| I−Is | <α2” (step S7: YES), parallel switching is performed (step S8). That is, parallel switching is performed when the predicted current value I is smaller than the predetermined threshold value α1 and the difference from the reference current value Is is smaller than the predetermined threshold value α2. Depending on the actual situation of the actual feeder system, the procedure of step S7 may be omitted. That is, it is determined whether or not parallel charging is possible based only on the threshold value α1 (the upper limit current flowing through the switching switch).

  By predicting the value of the current that flows when different feeders are inserted in parallel by the switching switch by the procedure described above, it is possible to bring in the wires in parallel with high safety. Therefore, it is not necessary to be particular about instantaneous parallel input of 0.3 seconds, and for example, switching in a long time of 30 seconds to 1 minute can be performed. Thus, switching with one switch (see FIG. 1B) is also possible.

(Description of configuration example of feeder control device)
Next, a configuration example of a feeding control device that controls opening and closing of the switching switch will be described.
FIG. 10 is a diagram showing a configuration example of a feeding control device that controls the switching switch of the switching section, and shows a portion directly related to the present invention. Note that. As this control device, a sequence controller (programmable controller) or the like can be used.

In FIG. 10, a main control unit 101 in the feeding control device 10 is configured by a CPU (central processing unit), a memory, and the like, and is a processing unit for performing overall control of the feeding control device 10.
The train entry determination unit 102 determines whether the train 21 has approached or entered the switching section 1 from the feeder 2 side while the switching switch 11 is “ON” and the switching switch 12 is “OFF”. It is a processing unit. The presence / absence of a train is received by the power control device 10 by receiving a detection signal indicating the presence / absence of a train from the activation circuit (train position), and the train entry determination unit 102 determines the existing method based on the detection signal. To do.

The measuring unit 103 is a processing unit for measuring the voltage or current of each part of the switching section 1. It becomes a measurement object, wicking current _{I AT1} flowing through the autotransformer AT1 wicking current _{I AT2} flowing through the autotransformer AT2, wicking current _{I AT3} flowing through the autotransformer AT3, autotransformer Suction current I _AT4 flowing through _AT4 , voltage V _SPA between feeder 2 and rail 4, and voltage V _SPB between feeder 3 and rail 4.

  The current value calculation unit 104 includes a network impedance calculation unit 104A, a predicted current value calculation unit 104B, and a reference current value calculation unit 104C. The network impedance calculation unit 104A calculates the network impedance seen from between the feeder line of the power source A and the feeder line of the power source B in the feeder section (SP). That is, the network impedance Z is calculated according to the equation (2). In addition, the network impedance calculation unit 104A also performs a process of calculating the train impedance based on the suction current flowing through the autotransformers AT1 to AT4.

  The predicted current value calculation unit 104B sets the switching switch 12 in the “ON” state of the switching switch 11 based on the voltage difference between the feeder line of the power source A and the feeder line of the power source B and the network impedance. It is a processing unit for calculating the predicted current value I flowing through the switching switch 12 when the switches are connected in parallel. This predicted current value I is calculated by equation (3).

  Further, the reference current value calculation unit 104C calculates the network impedance and the suction current flowing through the autotransformers AT1 to AT4 when there is no cross current (when there is no voltage difference and phase difference between different power sources). Based on this, it is a processing unit for calculating the current flowing through the switching switch 12. This reference current value Is is calculated by the equation (11).

  The parallel switching availability determination unit 105 is a processing unit for determining whether the switching switch 12 can be switched in parallel according to the predicted current value I and the reference current value Is calculated by the current value calculation unit 104. . In this case, when the predicted current value I is smaller than the predetermined threshold value α1 and the difference between the predicted current value I and the reference current value Is is smaller than the predetermined threshold value α2, switching switches can be turned on in parallel. judge.

  The switching switch control unit 106 switches on the switching switch 11 and the switching switch 12 in parallel for a predetermined time when the parallel switching availability determination unit 105 determines that parallel switching is possible, and switches the switching switch after a predetermined time has elapsed. Control to turn off the device 12 is performed. In addition, when it is determined by the parallel switching availability determination unit 105 that parallel switching is impossible, both the switching switch 11 and the switching switch 12 are set to “OFF”, the intermediate section is temporarily interrupted, and then the switching switch Control is performed so as to perform the conventional 0.3 second power failure switching with 12 set to “ON”.

  Although the embodiment of the present invention has been described above, the feed control device of the present invention is not limited to the above-described illustrated examples, and various modifications can be made without departing from the scope of the present invention. Of course.

  In the present invention, when the power of different feeders is switched on in parallel by the switching switch in the switching section in the feeder section, the current value flowing through the switching switch is predicted, and the feeders differ with high safety. Therefore, the present invention is useful for a feeding control device in a switching section, a feeding switching method, and the like in an AT AC feeding system.

It is explanatory drawing of the switching system by the feeding control apparatus of this invention. It is a figure which shows the equivalent circuit between A substation (ASS) and B substation (BSS) (when there is a voltage difference between different power supplies). It is a figure which shows the equivalent circuit between A substation (ASS) and B substation (BSS) (when there is no voltage difference between different power supplies). It is a figure which shows the electric current which flows into a switching switch. It is a figure which shows the equivalent circuit which calculates | requires switching switch electric current from the voltage difference between different power sources. It is a figure which shows the electric current path | route of the train which drive | works directly under the feeder section (SP). It is a figure which shows AT wicking current in a feeding section (SP). It is a figure which shows the equivalent circuit which calculates | requires a reference current value. It is a figure which shows a parallel switching determination algorithm. It is a figure which shows the structural example of a feeding control apparatus. It is a figure for demonstrating the switching section of a feeder section.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Switching section 2, 3 feeder 4 Rail 10 Feed controller 11, 12 Switching switch 13, 14 Air section 15 Middle section 21 Train 101 Main control part 102 Train approach determination part 103 Measurement part 104 Current value calculation part 104A circuit Net impedance calculation unit 104B Predicted current value calculation unit 104C Reference current value calculation unit 105 Parallel application availability determination unit 106 Switching switch control unit AT1, AT2, AT3, AT4 Single-turn transformer Is Reference current value I _AT1 single-turn transformer AT1 I Suction current of _AT2 autotransformer AT2 I Suction current of _AT3 autotransformer AT3 I Suction current of _AT4 autotransformer AT4 Vs Voltage difference between feeders

Claims (13)

A power source A feeder line of an A substation (ASS) of an AC electric railway using an AT AC feeder system and a power source B feeder wire of a B substation (BSS) different from the A substation (ASS) In a switching section provided in a power distribution section (SP), for connecting or opening the power supply A and the intermediate section to or from the intermediate section provided insulated from the both power lines. A feeder control device for controlling a first switching switch and a second switching switch for connecting or opening the feeder line of the power source B and the intermediate section,
In the switching section, measuring means for measuring voltage and current of a predetermined portion including at least the voltage of the feeder line of the power source A and the voltage of the feeder line of the power source B;
Network impedance calculating means for calculating a network impedance seen from between the feeder line of the power source A and the feeder line of the power source B of the feeder section (SP);
Based on the voltage difference between the feeder line of the power source A and the feeder line of the power source B and the network impedance measured by the measuring means, the first switching switch is in the “ON” state. Predicted current value calculating means for calculating a predicted current value I flowing through the second switching switch when two switching switches are connected in parallel;
Based on the value of the predicted current value I, parallel on / off availability determination means for determining whether or not the second switching switch can be turned on in parallel when the first switching switch is in an “on” state;
When the parallel switching availability determination unit determines that parallel switching is possible, the second switching switch is switched on in parallel for a predetermined time while the first switching switch is “ON”, and a track circuit ( Switching switch control means for returning the second switching switch, which is controlled by receiving a supply of a detection signal indicating “present” or “absent” of the presence of a train from (for train position detection);
A feeder control device comprising: Assuming that there is no voltage difference and phase difference between the feeder line of the power source A and the feeder line of the power source B, the second switching switch is turned on when the first switching switch is in the “on” state. Assuming that they were put in parallel,
A reference current value calculation means for calculating a current flowing through the second switching switch based on the network impedance, and setting the calculated current value as a reference current value Is;
Based on the predicted current value I and the reference current value Is, it is determined whether or not the parallel switching can be performed to determine whether or not the second switching switch can be switched in parallel when the first switching switch is “ON”. A determination means;
The feeding control device according to claim 1, further comprising: Only when the predicted current value I is smaller than the predetermined threshold value α1 and the difference between the predicted current value I and the reference current value Is is smaller than the predetermined threshold value α2, the first switching switch is The feeding control device according to claim 2, further comprising: a parallel on / off availability determining unit that determines that the second switching switch can be turned on in parallel in the "on" state. When it is determined that the parallel switching of the first switching switch is impossible by the parallel switching availability determination unit,
By turning off both the first switching switch and the second switching switch to temporarily interrupt the intermediate section, and then turning on the second switching switch, The feeder control device according to any one of claims 1 to 3, wherein the feeder for supplying power is switched from the feeder of the power source A to the feeder of the power source B. When calculating the network impedance between the feeder line of the power source A and the feeder line of the power source B by the network impedance calculation means,
The feeder control device according to any one of claims 1 to 4, wherein the feeder controller is calculated including the impedance of the train that is running while approaching the feeder section. When a self-winding transformer (AT) is installed at the feeding section,
The feeding control device according to claim 5, wherein the train impedance is obtained based on a suction current value flowing through the autotransformer. When determining the network impedance Z between the feeder line of the power source A and the feeder line of the power source B,
_{Z = [Z CA × (Z} 0A + Z TA + Z FA) / (Z 0A + Z TA + Z FA + Z CA)]
_{+ [Z CB × (Z 0B} + Z TB + Z FB) / (Z 0B + Z TB + Z FB + Z CB)],
here,
Z _0A : Impedance on the three-phase side as seen from the A substation (ASS) receiving point,
Z _TA : Leakage impedance of feeding transformer of A substation (ASS),
Z _FA : impedance of feeder circuit between A substation (ASS) and feeder section (SP),
Z _CA : Impedance of the train near the A substation (ASS) near the feeder section (SP),
Z _0B : Impedance on the three-phase side viewed from the receiving point of B substation (BSS),
Z _TB : Leakage impedance of feeder transformer of B substation (BSS),
Z _FB : impedance of feeder circuit between B substation (BSS) and feeder section (SP),
_ZCB : Impedance of the train on the B substation (BSS) side near the feeder section (SP),
As sought
The predicted current value I is based on the voltage difference Vs between the feeder line of the power source A and the feeder line of the power source B.
I = Vs / Z,
The feeding control device according to claim 1, wherein the feeding control device is obtained by: A power transformer A1 is provided for the feeder line of the power source A in the feeder section, a transformer A3 is provided for the feeder line of the power source B, and the feeder line of the power source A is also provided on the opposite line side. When the winding transformer AT2 is provided with the winding transformer AT4 on the feeder line of the power source B,
Wherein the wicking current _{I AT1} autotransformer AT1, wherein the wicking current _{I AT2} of autotransformer AT2, wherein the wicking current _{I AT3} of autotransformer AT3, absorption of the autotransformer AT4 Measure the rising current _IAT4 , the voltage V _SPA of the power supply A feeder line, and the voltage V _SPB of the power supply B feeder line,
The train impedance Z _CA on the A substation (ASS) side is
Z _CA = 0.92 × V _SPA / (I _AT1 + I _AT2 ),
In
Train impedance Z _CB on the B substation (BSS) side,
Z _CB = 0.92 × V _SPB / (I _AT3 + I _AT4 ),
The feeding control device according to claim 7, wherein A power transformer A1 is provided for the feeder line of the power source A in the feeder section, a transformer A3 is provided for the feeder line of the power source B, and the feeder line of the power source A is also provided on the opposite line side. When the winding transformer AT2 is provided with the winding transformer AT4 in the feeder line of the power source B,
Wherein the wicking current _{I AT1} autotransformer AT1, wherein the wicking current _{I AT2} of autotransformer AT2, wherein the wicking current _{I AT3} of autotransformer AT3, absorption of the autotransformer AT4 Measure the raised current _IAT4 ,
The reference current value Is is
Is = [Z _A × (I _{AT1 + 2} ) −Z _B (I _{AT3 + 4} )] / [0.92 × (Z _A + Z _B )],
here,
Z _A = (Z _0A + Z _TA + Z _FA ),
Z _B = (Z _0B + Z _TB + Z _FB ),
I _{AT1 + 2} = (I _AT1 + I _AT2 ),
I _{AT3 + 4} = (I _AT3 + I _AT4 ),
The feeding control device according to claim 7, wherein the feeding control device is obtained as follows. A power source A feeder line of an A substation (ASS) of an AC electric railway using an AT AC feeder system and a power source B feeder wire of a B substation (BSS) different from the A substation (ASS) In a switching section provided in a power distribution section (SP), for connecting or opening the power supply A and the intermediate section to or from the intermediate section provided insulated from the both power lines. A feeding switching method in a feeding control device for controlling a first switching switch and a second switching switch for connecting or opening the feeder line of the power source B and the intermediate section. ,
By the control unit in the feeding control device,
In the switching section, a measurement procedure for measuring voltage and current of a predetermined portion including at least the voltage of the feeder line of the power source A and the voltage of the feeder line of the power source B;
A network impedance calculation procedure for calculating a network impedance seen from between the feeder line of the power source A and the feeder line of the power source B of the feeder section (SP);
Based on the voltage difference between the feeder line of the power source A and the feeder line of the power source B and the network impedance measured by the measurement procedure, the first switching switch is in the “ON” state. A predicted current value calculating procedure for calculating a predicted current value I flowing through the second switching switch when two switching switches are connected in parallel;
Based on the value of the predicted current value I, the parallel switching availability determination procedure for determining whether or not the second switching switch can be switched in parallel when the first switching switch is in the “ON” state;
When it is determined that parallel charging is possible according to the parallel switching availability determination procedure, the second switching switch is switched on in parallel for a predetermined time while the first switching switch is in the “ON” state, and a track circuit ( A switching switch control procedure for returning the second switching switch that is controlled by receiving a supply of a detection signal indicating “present” or “absent” of the presence of a train from “for train position detection”;
Switching method, characterized in that is performed. Assuming that there is no voltage difference and phase difference between the feeder line of the power source A and the feeder line of the power source B, the second switching switch is turned on when the first switching switch is in the “on” state. Assuming that they were put in parallel,
A reference current value calculation procedure for calculating a current flowing through the second switching switch based on the network impedance and using the calculated current value as a reference current value Is;
Based on the predicted current value I and the reference current value Is, it is determined whether or not the parallel switching can be performed to determine whether or not the second switching switch can be switched in parallel when the first switching switch is “ON”. Judgment procedure;
The feeding switching method according to claim 10, further comprising: Only when the predicted current value I is smaller than the predetermined threshold value α1 and the difference between the predicted current value I and the reference current value Is is smaller than the predetermined threshold value α2, the first switching switch is The feeding switching method according to claim 11, further comprising a parallel switching permission / inhibition determination procedure for determining that the second switching switch can be switched in parallel in the “ON” state. When the parallel switching availability determination means determines that the parallel switching of the second switching switch is impossible,
By turning off both the first switching switch and the second switching switch to temporarily interrupt the intermediate section, and then turning on the second switching switch, The feeder switching method according to any one of claims 10 to 12, further comprising a step of switching a feeder to be fed to the feeder from the feeder of the power source A to the feeder of the power source B.

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