JP5658440B2 - Electric vehicle control device - Google Patents

Description

The present invention relates to an electric vehicle control device.

  The conventional electric vehicle control device includes a converter that converts AC power supplied from an overhead line via a pantograph into DC power, and both ends of the AC side of the converter are connected to the secondary winding via a charging contactor and a contactor, respectively. A transformer connected to both ends; a high-speed circuit breaker provided between the transformer and the pantograph; an inverter connected to the DC side of the converter for converting DC power to AC power; and the AC side of the inverter A motor driven by AC power supplied from the inverter, a filter capacitor connected between the DC terminals of the converter, a current detector connected to one end of the DC terminal of the converter, and detected by the current detector Ground fault detection means for outputting a ground fault detection signal when the measured current value exceeds a predetermined value, and the ground fault detection signal is output by the ground fault detection means. If it is force, high-speed circuit breaker, and a first control unit for opening at least one of the first contactor.

  Since the conventional electric vehicle control device configured in this way is provided with a current detector at one end of the DC terminal of the converter, it can detect a ground fault quickly and prevent the ground fault current from continuing to flow. (See Patent Document 1).

Japanese Patent Laid-Open No. 11-235039

  However, in the conventional electric vehicle control device, the ground fault detection means for detecting the ground fault is a buffer (receiver) for receiving the current detection value from the current detector, or for comparing the current detection value. A comparison unit is required. The buffer and the comparison unit basically require a plurality of semiconductor chips, and the number of parts increases, so the failure rate inevitably increases.

In a railway vehicle, the ground fault detection means is generally determined to have a periodic inspection once every two years. However, the above-mentioned ground fault detection method using a current detector has a high failure rate, so it is once every two years. There was a possibility of insufficient quality in the inspections of the times.

In order to solve this problem, a method of shortening the periodic inspection period is also conceivable. However, in order to inspect the electric vehicle control device, it is necessary to take out the equipment from the vehicle and perform a test. Since it requires a lot of work, there was a problem of location and manpower, which was difficult in practice.

Therefore, an object of the present invention is to provide an electric vehicle control device capable of reducing the inspection work of the ground fault detection means and shortening the inspection cycle.

The above problem is that a converter that converts AC power supplied from an overhead wire through a pantograph into DC power, and both ends of the AC side of the converter are connected to the first and second contactors, respectively.
A transformer connected to both ends of the next winding, a high-speed circuit breaker provided between the transformer and the pantograph, an inverter connected to the DC side of the converter and converting DC power to AC power; A motor connected to the AC side of the inverter and driven by AC power supplied from the inverter; a filter capacitor connected between DC terminals of the converter; and a current connected to a neutral point of the filter capacitor A ground fault detecting means for outputting a ground fault detection signal when the current value detected by the current detector exceeds a predetermined value; and controlling the converter and the inverter; When a ground fault detection signal is input by the detection means, the high-speed circuit breaker, a control unit that opens at least one of the first and second contactors, A repair circuit provided on the primary side of the detector and capable of flowing a repair current, and operating the repair circuit at a predetermined timing and passing a repair current to the current detector This can be achieved by providing repair judgment means for judging whether or not the ground fault detection means is operating normally.

According to the present invention, it is possible to provide an electric vehicle control device capable of reducing the repair work of the ground fault detection means and shortening the repair cycle.

It is a block diagram of the electric vehicle control apparatus of 1st Embodiment based on this invention.

(First embodiment)
An electric vehicle control apparatus according to a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a configuration diagram of an electric vehicle control apparatus according to a first embodiment of the present invention.

In the electric vehicle control apparatus according to the first embodiment of the present invention, the pantograph 1 is provided on the roof of the vehicle in order to exchange AC power from the overhead line. The high-speed circuit breaker 2 is provided for interrupting current, and one end thereof is connected to the pantograph 1 and the other end is connected to the primary winding of the transformer 3. The transformer 3 is provided for performing voltage conversion, and a first contactor 4 and a second contactor 5 are connected to both ends of the secondary winding. The converter 6 is provided to convert alternating current power into direct current power, and is connected to the secondary winding of the transformer 3 via the first contactor 5 and the second contactor 6. An inverter 9 for converting DC power to AC power is connected to the DC side of the converter 6. A first filter capacitor 7 and a second filter capacitor 8 are connected between the DC terminals of the converter 6. A motor 10 is connected to the AC side of the inverter 9. The neutral point of the filter con Den Sa (between the first filter capacitor 7 and the second filter capacitor 8), one end of the series circuit composed of the resistor 12 and the current detector 13. is connected, the other end grounded Has been. The capacitor 11 is connected in parallel to a series circuit including a resistor 12 and a current detector 13. The current value detected by the current detector 13 is input to the control unit 14. One end of the primary side of the current detector 13 is connected to a repair circuit including a resistor 20, a switch 21, and a battery 22, and the other end is grounded.

  The control unit 14 controls the switching of the converter / inverter control means 19, the ground fault detection means 15 that detects the ground fault current and outputs a ground fault detection signal, the high-speed circuit breaker 2, the contactor 4, and the contactor 5. The contactor control means 17 is configured.

The ground fault detection means 15 includes a comparator 16 connected to the current detector 13 and a repair determination means 18 connected to the comparator 16 via a buffer (not shown).

  In the electric vehicle control device configured as described above, the ground fault detection means 15 of the control unit 14 compares the current value detected by the current detector 16, and if the current value is equal to or greater than a predetermined value, A ground fault detection signal is input to the contactor control means 17. The contactor control means 17 opens the contactors 4 and 5 when a ground fault detection signal is input from the ground fault detection means 15, and shuts off at a high speed when the ground fault detection signal is input for a predetermined time or more. Open the device 2 and cut off the current. The converter / inverter control means 19 supplies AC power to the motor 10 by controlling switching of the elements of the converter 6 and the inverter 9.

  The current value input to the ground fault detection means 15 is input to the comparator 16 through a buffer (not shown), and the input current value is compared. Is output. The ground fault detection signal is input to the repair determination means 18, the contactor control means 17, and the converter / inverter control means 19.

  The repair judgment means 18 turns on the switch 21 when the first contactor 4 and the second contactor 5 are opened, and detects the current from the battery 22 to the current detector 13 via the resistor 20. Apply the repair current. If each device is normal, when a repair current flows, the current value is detected by the current detector 13, the ground fault detection signal is input by the comparator 16, and the ground fault detection signal is input to the repair determination means 18. Is done. However, if each device is not normal, the ground fault detection signal is not input to the repair determination means 18. For this reason, if the ground fault detection signal is input when the switch 21 is turned on based on a predetermined condition, the ground fault detection means 15 regards the current detector 13 and the ground fault detection means 15 as normal, and the ground fault is detected. If no detection signal is input, it is assumed that the current detector 13 or the ground fault detection means 15 has failed, and a failure signal is output to a monitor (not shown).

Since the electric vehicle control device configured as described above includes the repair circuit (20, 21, 22) in the device, the electric vehicle control device can determine whether or not the current detector is normal. There is no need to remove the device from the vehicle. Further, at a predetermined timing, the system side carries out the inspection circuit (20,
21 and 22) are operated, and a current for repairing is supplied to the current detector 13, so that the current detector 13 and the ground
Since it is possible to determine whether or not the contact detection means 15 is operating normally, it is possible to shorten the inspection period in actual operation.

In addition, in the electric vehicle control apparatus of the present embodiment, since a ground fault current flows through the resistor 12 in the case of a ground fault, it is only necessary to pass a small current, so there is no need to provide a large battery. The repair circuit (20, 21, 22) can be reduced in size, and can be incorporated in the control unit 14. Therefore, there is an advantage that it can be mounted on a conventional electric vehicle control device.

(Second Embodiment)
The electric vehicle control apparatus according to the second embodiment based on the present invention is different from the electric vehicle control apparatus according to the first embodiment based on the present invention in that the repair judgment means 18 turns on the switch 21 for repair. The timing of current flow is different.

In the electric vehicle control apparatus according to the second embodiment of the present invention, the switch 21 is turned on and a current for repairing is supplied on condition that the high-speed circuit breaker 2 is open. The repair determination means 18 assumes that the ground fault detection means 15 is normal when the current value of the repair current is input by the comparator 16 and the ground fault detection signal is detected by the comparator 16. Is not input, it is considered that the ground fault detection means 15 has failed, and a failure signal is output to a monitor (not shown).

The electric vehicle control device configured as described above can reduce the repair work of the ground fault detection means and shorten the repair cycle.

(Third embodiment)
The electric vehicle control device according to the third embodiment based on the present invention is different from the electric vehicle control device according to the first embodiment based on the present invention in that the repair judgment means 18 turns on the switch 21 for the repair. The timing of current flow is different.

In the electric vehicle control apparatus according to the third embodiment of the present invention, the lever in the driver's cab (not shown) (assuming a system that turns on the first and second contactors when the lever is inserted) is neutral. On condition, the switch 21 is turned on and a current for repairing is supplied. The repair determination means 18 assumes that the ground fault detection means 15 is normal when the current value of the repair current is input by the comparator 16 and the ground fault detection signal is detected by the comparator 16. Is not input, it is considered that the ground fault detection means 15 has failed, and a failure signal is output to a monitor (not shown).

The electric vehicle control device configured as described above can reduce the repair work of the ground fault detection means and shorten the repair cycle.

In the electric vehicle control apparatus according to the first to third embodiments based on the present invention, the current detector is configured to be connected to the neutral point of the capacitor. For example, in the case of an AC / DC electric vehicle The current detector is connected to the ground side of the DC terminal, and the present invention is applied. Even in the case of an electric vehicle for AC / DC use, as in other embodiments, the inspection work of the ground fault detection means can be reduced and the inspection cycle can be shortened.

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

DESCRIPTION OF SYMBOLS 1 ... Pantograph 2 ... High speed circuit breaker 3 ... Transformer 4 ... 1st contactor 5 ... 2nd contactor 6 ... Converter 7 ... 1st filter Capacitor 8 ... Second filter capacitor 9 ... Inverter 10 ... Motor 11 ... Capacitor 12 ... Resistance 13 ... Current detector 14 ... Control unit 15 ... Ground fault detection Means 16 ... Comparator 17 ... Contactor control means 18 ... Repair judgment means 19 ... Converter / inverter control means 20 ... Resistance 21 ... Switch 22 ... Battery

Claims (10)

A converter that converts AC power supplied from an overhead line through a pantograph into DC power;
A transformer in which both ends of the AC side of the converter are connected to both ends of the secondary winding via first and second contactors,
A high-speed circuit breaker provided between the transformer and the pantograph;
An inverter connected to the DC side of the converter and converting DC power to AC power;
A motor connected to the AC side of the inverter and driven by AC power supplied from the inverter;
A filter capacitor connected between the DC terminals of the converter;
A current detector connected to the neutral point of the filter capacitor or the ground side of the DC terminal;
A ground fault detection means for outputting a ground fault detection signal when the current value detected by the current detector exceeds a predetermined value;
Control for controlling the converter and the inverter, and opening the at least one of the high-speed circuit breaker and the first and second contactors when a ground fault detection signal is input by the ground fault detection means And
A repair circuit provided on the primary side of the current detector and capable of flowing a repair current;
A repair determining means for operating the repair circuit at a predetermined timing and passing a repair current to the current detector to determine whether the ground fault detection means is operating normally; An electric vehicle control device comprising: A converter that converts AC power received by the pantograph into DC power;
A transformer in which both ends of the AC side of the converter are connected to both ends of the secondary winding through the first contactor and the second contactor,
A circuit breaker provided between the transformer and the pantograph;
An inverter connected to the DC side of the converter and converting DC power to AC power;
A filter capacitor connected between the DC terminals of the converter;
A current detector connected to the neutral point of the filter capacitor or the ground side of the DC terminal;
A ground fault detection means for outputting a ground fault detection signal when the current value detected by the current detector exceeds a predetermined value;
When a ground fault detection signal is input by the ground fault detection means, a control unit that opens at least one of the circuit breaker, the first contactor, and the second contactor;
Repair that determines whether or not the ground fault detection means or the current detector is operating normally by passing a repair current to the current detector from a repair circuit connected to the current detector. Judgment means,
An electric vehicle control device comprising: In the electric vehicle control device according to claim 1 or 2,
The electric vehicle control apparatus characterized in that the repair determination means operates the repair circuit on condition that the first and second contactors are opened. In the electric vehicle control device according to claim 1,
The electric vehicle control apparatus characterized in that the inspection and determination means operates the inspection circuit on condition that the high-speed circuit breaker is opened. In the electric vehicle control device according to claim 2,
The electric vehicle control device characterized in that the repair determination means operates the repair circuit on condition that the circuit breaker is opened. In the electric vehicle control device according to any one of claims 1 to 5,
The electric vehicle control device characterized in that the inspection / repair determining means operates the inspection / repair circuit based on a neutral signal of a lever. In the electric vehicle control device according to any one of claims 1 to 6,
The electric vehicle control device, wherein the ground fault detection means and the repair determination means are built in the control unit. In the electric vehicle control device according to any one of claims 1 to 7,
The electric vehicle control device, wherein the current detector is connected to a neutral point of the filter capacitor or a ground side of a DC terminal via a resistor. In the electric vehicle control device according to any one of claims 1 to 8,
The electric vehicle control apparatus, wherein the repair circuit includes a switch and a battery. A converter that converts AC power received by the pantograph into DC power;
A first contactor and a second contactor connected to the alternating current side of the converter;
An inverter connected to the DC side of the converter and converting DC power to AC power;
A filter capacitor connected between the DC terminals of the converter;
A current detector connected to a neutral point of the filter capacitor;
A ground fault detection means for outputting a ground fault detection signal when the current value detected by the current detector exceeds a predetermined value;
Repair judgment means for discriminating whether or not the ground fault detection means or the current detector is operating normally by passing a repair current to the current detector;
A control unit that opens one of the first contactor and the second contactor when a ground fault detection signal is input by the ground fault detection means ; Electric vehicle control device.

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