JP5305636B2 - Control method for switching on different power supply in switching section of AC electric railway - Google Patents

Description

  The present invention relates to a turning-on control method for turning on a different power source in a switching section serving as a switching point of a different power source in an AC electric railway.

  Generally, the following method is known as a method of turning on a different power source in a switching section that is a switching point of a different power source in an AC electric railway.

  In the switching section, before the electric vehicle passes, the open-side switching switch connected to the open-side power supply is in the on state, and the closing-side switch switch connected to the on-coming power source is in the open state. In such a state, when the electric vehicle enters the switching section, the open side switching switch is opened from the on state. About 300 milliseconds after opening of the open side switching switch, the closing side switching switch is turned on from the open state.

  However, in the above-described method, the voltage phase of the power supply on the input side when the switch on the input side is switched on, and the transformer cooling fan connected to the tertiary winding of the main transformer of the electric vehicle existing in the switching section, etc. Depending on the relationship with the reverse pressurization voltage phase from the auxiliary rotating machine, a DC component may be transiently generated in the magnetic flux inside the iron core of the main transformer of the electric vehicle. The generation of this DC component may saturate the iron core. As a result, if an excessive magnetizing inrush current flows through the feeder circuit, problems such as transient voltage fluctuations in the power system and unnecessary operation of the feeder circuit protection relay may occur.

Then, the following method is disclosed as a method of turning on the different power source for reducing the magnetizing inrush current of the main transformer of the electric vehicle. The effective value of the input side power supply voltage, the effective value of the switching section voltage, and the phase difference of the switching section voltage with respect to the input side power supply voltage are detected. Based on these detection results, the on-side power-on phase is obtained by calculation. As a result, the input side power supply is turned on when the input phase is reached while monitoring the voltage waveform of the input side power supply (see Patent Document 1).
Japanese Patent Application Laid-Open No. 07-117531

  However, in the method disclosed in the prior art document as described above, the arithmetic circuit or software arithmetic algorithm becomes complicated when the control is actually realized.

  Accordingly, an object of the present invention is to reduce the magnetizing inrush current of the main transformer of an electric vehicle with simpler control when the electric vehicle of an AC electric railway travels in a switching section that is a switching point of a different power source. Thus, an object of the present invention is to provide a turn-on control method capable of turning on a different power source in the switching section.

When an electric vehicle of an AC electric railway according to an aspect of the present invention travels in a switching section that serves as a switching point for different power sources, the input power that controls one of the different power sources to be turned on is controlled in the switching section. In the control method, the voltage value of the switching section is acquired, the voltage value of the input-side power supply is acquired, and the voltage crossing point at which the acquired voltage value of the switching section is equal to the acquired voltage value of the input-side power supply detects, as a flux interaction point where the magnetic flux is estimated to be equal to the post-quarter period of the closing-side power supply from said detected voltage crossing point the flux of the switching section wherein the input side power supply, the magnetic flux The turning-on power supply is turned on in the switching section at the time of intersection .

  According to the present invention, when an electric vehicle of an AC electric railway travels in a switching section serving as a switching point of a different power source, the excitation inrush current of the main transformer of the electric vehicle is reduced with simpler control. It is possible to provide a turn-on control method capable of turning on a different power source in the switching section.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, items common to the embodiments will be described.

  FIG. 5 is a block diagram showing the power system of an AC electric railway.

  In this power system, auto-transformers (AT) 8 are respectively connected between the trolley wire 3 and the rail 4 and between the rail 4 and the electric wire 5. Power is received from the open-side power source and the input-side power source, and two sets of single-phase alternating currents having different voltage phases are fed to each direction by feeding breakers 9A, 9B, 9C, and 9D. These electric powers are supplied to the electric vehicle 7 traveling in the traveling direction F by the trolley wire 3 and the rail 4 through the autotransformer 8. The open side switching switch 2 </ b> T receives power from the open side power supply and supplies power to the switching section 6. On the other hand, the making-side switching switch 2 </ b> C receives power from the making-side power source and supplies power to the switching section 6.

(First embodiment)
FIG. 1 is a block diagram showing a configuration to which an input control device 1 according to the first embodiment of the present invention is applied. Note that the same parts as those in FIG. 5 are denoted by the same reference numerals, detailed description thereof is omitted, and different parts are mainly described. In the following embodiments, the same description is omitted.

  Voltage detectors P1 and P2 are provided in the power system to which the charging control device 1 is applied.

  The voltage detector P1 is a device that detects the voltage of the switching section 6.

  The voltage detector P2 is a device that detects the voltage of the power supply on the input side.

  The making control device 1 includes an intersection detection unit 11, a timer 12, and a making command unit 13.

  The intersection detection unit 11 takes in the voltage of the switching section 6 (hereinafter referred to as “switching section voltage”) detected by the voltage detector P1. The intersection detection unit 11 takes in the voltage of the input side power supply detected by the voltage detector P2 (hereinafter referred to as “input side power supply voltage”). The intersection detection unit 11 detects the timing (time point) at which the switching section voltage and the input side power supply voltage become equal based on the voltages taken from the voltage detectors P1 and P2. When the intersection detection unit 11 detects this timing, it transmits a signal to the timer 12.

  When the timer 12 detects a signal from the intersection detection unit 11, the timer 12 outputs a signal to the input command unit 13 after a quarter period (90 degrees) of the frequency of the input side power supply.

  When receiving a signal from the timer 12, the input command unit 13 outputs a input command to the input side switching switch 2C.

  The closing side switch 2 </ b> C is turned on when a closing command is received from the charging command unit 13.

  FIG. 2 is a waveform diagram showing the relationship between the voltage and magnetic flux between the switching section 6 and the power source on the power system to which the power control device 1 according to this embodiment is applied. In FIG. 2, the thick line is the waveform of the voltage Vtr applied to the main transformer of the electric vehicle 7 and the iron core magnetic flux φtr.

  Time Tv is a timing at which the switching section voltage Vs becomes equal to the input-side power supply voltage Vt. That is, the time Tv is a time at which two waveforms of the switching section voltage Vs and the input side power supply voltage Vt intersect.

  The time Tφ is a time that is ¼ period (90 degrees) after the frequency of the input side power supply (or the open side power supply) from the time Tv. Time Tφ is a timing at which the magnetic flux φs in the switching section 6 of the main transformer of the electric vehicle 7 becomes equal to the magnetic flux φt that is estimated to be generated from when the input-side power supply is turned on. That is, the time Tφ is a time at which two waveforms of the magnetic flux φs in the switching section 6 of the main transformer of the electric vehicle 7 and the magnetic flux φt estimated to be generated from the time when the input side power source is turned on intersect.

  The closing control device 1 switches on the closing side switch 2C at the time Tφ.

  In order to reduce the magnetizing inrush current of the main transformer of the electric vehicle, it is sufficient that no DC component is generated in the iron core magnetic flux of the main transformer of the electric vehicle when the input side power source is turned on.

  Since the magnetic flux is proportional to the time integral of the applied voltage, assuming that the applied voltage is a sine wave, the phase of the magnetic flux is delayed by 90 degrees with respect to the applied voltage. From this, the timing at which the magnetic flux in the switching section 6 and the magnetic flux estimated to be generated from the time when the input side power source is turned on are equal to the timing at which the switching section voltage and the input side power source voltage are equal (time Tv). After 90 degrees. Therefore, if the closing side switch 2C is turned on at this timing (time Tφ), the excitation rush of the main transformer of the electric vehicle is reduced.

  According to this embodiment, the following effects can be obtained.

  The making control method according to the present embodiment detects the crossing of the switching section voltage and the making-up side power supply voltage, and issues a making command after a quarter of the detection time. Thereby, the excitation inrush current of the main transformer of the electric vehicle 7 when the electric vehicle 7 travels through the switching section 6 can be reduced. Therefore, the making control device 1 using this making control method can perform control based on the instantaneous value data obtained from the voltage detectors P1 and P2 without requiring an operation for obtaining an effective value or the like. The arithmetic algorithm of the arithmetic circuit or software can be simplified.

  Therefore, when the electric vehicle 7 of the AC electric railway travels the switching section 6 with a simpler configuration and control, the switching section 6 is turned on so that the inrush current of the main transformer of the electric vehicle 7 becomes smaller. It is possible to provide the making control device 1 to which the making control method capable of turning on the power is applied.

(Second Embodiment)
This embodiment is a modification of the first embodiment. The time set in the timer 12 of the making control device 1 according to the first embodiment can be made variable. Other points are the same as those of the first embodiment shown in FIG.

  The time set in the timer 12 is corrected from a time corresponding to a quarter cycle (90 degrees) according to various situations. For example, the case where the time set in the timer 12 is corrected is as follows.

  This is a case where there is a detection delay in the voltage detector P1 of the switching section 6 or the voltage detector P2 of the input side power supply. In this case, taking this detection delay into account, the timer 12 is corrected so that the closing side switch 2C is turned on after a quarter cycle from the timing when the switching section voltage and the closing side power supply voltage become equal. To do.

  Another situation is when: The voltage of the switching section 6 is reverse pressurization from a rotating machine auxiliary machine mounted on the electric vehicle 7. For this reason, the frequency of the switching section voltage may change depending on the state of the rotating machine accessory. In this case, the timing at which the magnetic flux in the switching section 6 is equal to the magnetic flux estimated to be generated from the time when the input side power source is turned on is ¼ cycle after the timing at which the switching section voltage and the input side power source voltage are equal. In some cases, deviation may occur. In this case, the change of the frequency of the switching section voltage is taken into account, and the timer 12 is corrected so that the closing side switch 2C is turned on at the timing when the two magnetic fluxes become equal.

  In addition, based on factors under various circumstances, the timing at which the two magnetic fluxes are equal may not be a quarter cycle after the timing at which the two voltages are equal. In such a case, the timer 12 is corrected so that the closing side switch 2C is turned on at the same timing of the two magnetic fluxes.

  According to the present embodiment, in addition to the operational effects of the first embodiment, the following operational effects can be obtained.

  The timing at which the magnetic flux of the switching section 6 and the estimated magnetic flux of the input-side power supply become equal, such as the detection delay of the voltage detectors P1 and P2, is 1/0 from the timing at which the switching section voltage and the input-side power supply voltage become equal. The timer 12 can be set so as to correct the deviation even when the deviation occurs, not after four cycles. As a result, it is possible to accurately control the input side power supply and to reduce the magnetizing inrush current of the main transformer of the electric vehicle.

(Third embodiment)
FIG. 3 is a block diagram showing a configuration to which the input control device 1A according to the third embodiment of the present invention is applied.

  The closing control device 1A is the same as the closing control device 1 shown in FIG. 1 except that 90-degree delay filters 21a and 21b are provided instead of the timer 12, and an intersection detection unit 11A is provided instead of the intersection detection unit 11. This is the same as the input control device 1.

  The 90-degree delay filter 21a is provided between the voltage detector P1 and the intersection detection unit 11A. The 90-degree delay filter 21a generates a signal whose phase is delayed by 90 degrees with respect to the voltage detection value of the switching section 6 detected by the voltage detector P1. This generated signal corresponds to a waveform estimated as the magnetic flux generated in the switching section 6. The 90-degree delay filter 21a outputs the generated signal to the intersection detection unit 11A.

  The 90-degree delay filter 21b is provided between the voltage detector P2 and the intersection detection unit 11A. The 90-degree delay filter 21b generates a signal whose phase is delayed by 90 degrees with respect to the voltage detection value of the input-side power supply detected by the voltage detector P2. This generated signal corresponds to a waveform that is presumed to be a magnetic flux generated in the power supply on the input side. The 90-degree delay filter 21b outputs the generated signal to the intersection detection unit 11A.

  11 A of intersection detection parts detect the timing from which each signal input from each of 90 degree | times delay filter 21a, 21b becomes equal. 11 A of intersection detection parts will transmit a signal to the input instruction | command part 13, if this timing is detected.

  When receiving the signal from the intersection detection unit 11A, the input command unit 13 outputs the input command to the input side switching switch 2C.

  The closing side switch 2 </ b> C is turned on when a closing command is received from the charging command unit 13.

  According to the present embodiment, the following operational effects can be obtained in addition to the operational effects of the first embodiment by providing the 90-degree delay filters 21a and 21b instead of using the timer 12 shown in FIG. .

  Since the signal harmonics are removed from the voltage harmonics by the 90-degree delay filters 21a and 21b, the input control device 1A can perform the input control with the influence of the voltage harmonics reduced.

(Fourth embodiment)
FIG. 4 is a block diagram showing a configuration to which the making control device 1B according to the fourth embodiment of the present invention is applied.

  The making control device 1B includes filters 22a and 22b, an intersection detection unit 11B, a timer 12B, and a making command unit 13.

  The filter 22a is provided between the voltage detector P1 and the intersection detection unit 11B. The filter 22a is a filter that removes voltage harmonics superimposed on the voltage detection value of the switching section 6 detected by the voltage detector P1. The filter 22a outputs the generated signal to the intersection detection unit 11B.

  The filter 22b is provided between the voltage detector P2 and the intersection detection unit 11B. The filter 22b is a filter that removes voltage harmonics superimposed on the detected voltage value of the input-side power source detected by the voltage detector P2. The filter 22b outputs the generated signal to the intersection detection unit 11B.

  When the timer 12B detects a signal from the intersection detection unit 11, the timer 12B outputs a signal to the input command unit 13 after a predetermined time. Here, the predetermined time is adjusted such that the sum of the phase delays by the filters 22a and 22b corresponds to a quarter period (90 degree delay). Also, if necessary, taking into account factors that cause a deviation in the timing at which the magnetic flux in the switching section 6 as described in the second embodiment and the magnetic flux estimated to be generated in the input-side power supply become equal, Set a predetermined time.

  When receiving a signal from the timer 12B, the input command unit 13 outputs a input command to the input side switching switch 2C.

  The closing side switch 2 </ b> C is turned on when a closing command is received from the charging command unit 13.

  According to the present embodiment, in addition to the operational effects of the first embodiment, the following operational effects can be obtained.

  The timing at which the magnetic flux of the switching section 6 and the estimated magnetic flux of the input-side power supply become equal, such as the detection delay of the voltage detectors P1 and P2, is 1/0 from the timing at which the switching section voltage and the input-side power supply voltage become equal. Even if there is a deviation after four cycles, the timer 12B can be set to correct the deviation. As a result, it is possible to accurately control the input side power supply and to reduce the magnetizing inrush current of the main transformer of the electric vehicle.

  Since the signal harmonics are removed from the signal detected by the voltage detector by the filters 22a and 22b, the making control device 1B can perform making control with reduced influence by the voltage harmonics.

  In each embodiment, the method of reducing the magnetizing inrush current of the main transformer of the electric vehicle 7 has been described with the configuration implemented in the input control device, but the present invention is not limited to this. If the charging control method according to each embodiment is used, it may be incorporated as a partial function of various devices such as a protective relay.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

The block diagram which shows the structure to which the control apparatus which concerns on the 1st Embodiment of this invention was applied. The wave form diagram which shows the relationship between the voltage and magnetic flux of the switching section in the electric power system which applied the making control apparatus which concerns on 1st Embodiment, and making side power supply. The block diagram which shows the structure to which the injection | throwing-in control apparatus which concerns on 3rd Embodiment was applied. The block diagram which shows the structure to which the making control apparatus which concerns on 4th Embodiment was applied. The block diagram which comprises the electric power system of an alternating current electric railway.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,1A, 1B ... Input control device, 2T ... Opening side switching switch, 2C ... Closing side switching switch, 3 ... Trolley wire, 4 ... Rail, 5 ... Feed wire, 6 ... Switching section, 7 ... Electric car, DESCRIPTION OF SYMBOLS 11, 11A, 11B ... AC detector, 12, 12B ... Timer, 13 ... Input command part, 21a, 21b ... 90 degree | times delay filter, 22a, 22b ... filter, F ... Traveling direction, P1, P2 ... Voltage detector.

Claims (8)

When the electric vehicle of the AC electric railway travels in the switching section that is the switching point of the different power source, in the input control method for controlling the input side power source that is one of the different power sources to the switching section,
Get the voltage value of the switching section,
Obtain the voltage value of the input power source,
Detecting a voltage crossing point at which the acquired voltage value of the switching section is equal to the acquired voltage value of the input side power supply,
One-fourth period after the detected voltage crossing time point is a magnetic flux crossing time point at which the magnetic flux of the switching section is estimated to be equal to the magnetic flux of the power supply side power source ,
A making control method , wherein the making side power supply is turned on to the switching section at the time of the magnetic flux crossing . The voltage value of the switching section is obtained through a filter that removes harmonics;
The input control method according to claim 1, wherein the voltage value of the input-side power source is acquired through a filter that removes harmonics . When the electric vehicle of the AC electric railway travels in the switching section that is the switching point of the different power source, in the input control method for controlling the input side power source that is one of the different power sources to the switching section,
Obtaining a switching section 90 degree delay voltage value generated by passing the voltage value of the switching section through a first 90 degree delay filter whose phase is delayed by 90 degrees;
Obtaining a voltage value of the input-side power supply 90 degrees delayed by passing a second 90-degree delay filter whose phase is delayed by 90 degrees from the voltage value of the input-side power supply;
Detecting the time point when the acquired switching section 90 degree delay voltage value is equal to the acquired input side power supply 90 degree delay voltage value;
It detected in the time, projecting insertion controlling how to said <br/> placing the said turned-side power to the switching section. The charging control method according to claim 3, wherein the first 90-degree delay filter and the second 90-degree delay filter remove harmonics . When the electric vehicle of the AC electric railway travels in a switching section that is a switching point of a different power source, in the input control method for controlling the input side power source that is one of the different power sources to the switching section,
Obtaining a switching section harmonic rejection voltage value generated by passing the voltage value of the switching section through a first filter that eliminates harmonics ;
Obtaining the input side power supply harmonic elimination voltage value generated by passing the voltage value of the input side power supply through a second filter that removes harmonics ;
Detecting the time point when the acquired switching section harmonic elimination voltage value and the obtained input side power supply harmonic elimination voltage value are equal,
From the detected time point, measure the time point estimated from the time point when the voltage value of the switching section and the voltage value of the input side power supply are equal to one quarter of the input side power supply,
A closing control method , wherein the closing side power source is turned on to the switching section at the measured time point . When the electric vehicle of the AC electric railway travels in a switching section that is a switching point for different power sources, in the input control device that controls the input side power source that is one of the different power sources to the switching section,
Switching section voltage acquisition means for acquiring a voltage value of the switching section;
A power supply voltage acquisition unit for acquiring the voltage value of the power supply on the input side;
A voltage crossing time detection means for detecting a voltage crossing time point at which the voltage value of the switching section acquired by the switching section voltage acquisition means and the voltage value of the input power supply acquired by the input power supply voltage acquisition means are equal;
One-fourth period after the voltage crossing time point detected by the voltage crossing time point detection means is a magnetic flux crossing time point at which the magnetic flux of the switching section and the magnetic flux of the power supply side are estimated to be equal. And a charging means for switching on the charging-side power source to the switching section at the time of the magnetic flux crossing.
Projecting insertion controlling device you comprising the. When the electric vehicle of the AC electric railway travels in a switching section that is a switching point for different power sources, in the input control device that controls the input side power source that is one of the different power sources to the switching section,
A first 90 degree lag filter that is 90 degrees out of phase;
A second 90 degree lag filter that is 90 degrees out of phase;
A switching section 90 degree delay voltage value acquisition means for acquiring a switching section 90 degree delay voltage value generated by passing the voltage value of the switching section through the first 90 degree delay filter;
A closing-side power supply 90-degree delayed voltage value acquiring means for acquiring a closing-side power supply 90-degree delayed voltage value generated by passing the voltage value of the closing-side power supply through the second 90-degree delay filter;
When the switching section 90 degree delay voltage value acquired by the switching section 90 degree delay voltage value acquisition means becomes equal to the input side power supply 90 degree delay voltage value acquired by the input side power supply 90 degree delay voltage value acquisition means Detecting means for detecting
Input means for supplying the input power to the switching section at the time point detected by the detection means;
Input control apparatus comprising the. When the electric vehicle of the AC electric railway travels in a switching section that is a switching point for different power sources, in the input control device that controls the input side power source that is one of the different power sources to the switching section,
A first filter for removing harmonics;
A second filter for removing harmonics;
Switching section harmonic rejection voltage acquisition means for acquiring a switching section harmonic rejection voltage value generated by passing the voltage value of the switching section through the first filter ;
A power-supply-side harmonic removal voltage acquisition means for acquiring a power-supply-side harmonic removal voltage value generated by passing the voltage value of the power-supply-side power through the second filter ;
Point when the switching section harmonic elimination voltage acquiring means the switching section harmonic elimination voltage value and the closing-side power supply harmonic elimination voltage value and is ing equally obtained by the closing-side power supply harmonic elimination voltage obtaining means obtained by and detection means you detect,
Before Symbol time point detected by the pre-dangerous detecting means, it is estimated that after a quarter period of the voltage values and the closing-side power supply from the time in which the voltage value becomes equal to the turned side power supply of the switching sections A timer to measure the time,
An input control device comprising: input means for supplying the input side power source to the switching section at the time point measured by the timer .

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