JP5856645B2 - 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 into AC power; and the AC side of the inverter A motor driven by AC power supplied from the inverter and 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 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, the high speed circuit breaker and a control unit that opens at least one of the first and second contactors are configured.

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, but 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 large-scale work is required, there is a problem of location and manpower, which is 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-described problems include a converter that converts AC power received through a pantograph, a circuit breaker, a transformer, and a contactor into DC power, an inverter that converts DC power output from the converter into AC power, and the converter One end is connected between the inverter and the inverter, and includes a current detector for detecting a current flowing due to a ground fault, and a control unit, and the control unit uses the battery mounted on the electric vehicle. A current that flows due to a ground fault if a current that is detected by the current detector does not satisfy a predetermined current value when a current for repair is passed through the current detector and the current for repair is passed. This can be achieved by determining that the detection of the error cannot be performed correctly.

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. One end of a series circuit composed of a resistor 12 and a current detector 13 is connected to the neutral point of the filter capacitor (between the first filter capacitor 7 and the second filter capacitor 8), and the other end is grounded. ing. 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. Therefore, the ground fault detection means 15 is based on a predetermined condition, and the switch 21
If the ground fault detection signal is input when the power is turned on, the current detector 13 and the ground fault detection means 15 are regarded as normal. If the ground fault detection signal is not input, the current detector 13 and the ground fault detection The fault detection means 15 is regarded as having failed, and a fault 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 it can be determined whether the current detector 13 and the ground fault detecting means 15 are operating normally. Shortening the cycle is also possible 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. When the current value of the current for repair is inputted as a ground fault detection signal from the comparator 16, the repair judgment means 18 is connected to the ground fault detection means 1.
5 is considered normal, and when the ground fault detection signal is not input by the comparator 16, it is considered that the ground fault detection means 15 has failed, and a fault 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.

An electric vehicle control apparatus according to a third embodiment of the present invention is a lever (not shown)
On the condition that the system that turns on the first and second contactors when the lever is inserted is neutral), the switch 21 is turned on and a current for repairing is made to flow. 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 (5)

A converter that converts AC power received through a pantograph, circuit breaker, transformer, and contactor into DC power;
An inverter that converts the DC power output from the converter into AC power;
One end is connected between the converter and the inverter, and a current detector for detecting a current flowing through a ground fault;
A control unit,
The controller is
Using a battery mounted on the electric vehicle, a current for repair is passed through the current detector,
The current value detected by the current detector when the current for repairing is flowing does not satisfy a predetermined current value, and it is determined that the current flowing due to the ground fault cannot be detected correctly. Electric vehicle control device.   A first capacitor and a second capacitor connected in series with each other are provided between the converter and the inverter, and one end of the current detector is connected between the first capacitor and the second capacitor. The electric vehicle control device according to claim 1, wherein:   The electric vehicle control device according to claim 1, wherein the other end of the current detector is grounded. Wherein the control unit, the electric vehicle control according to any one of claims 1 to 3, characterized in that the inspection and repair for the flow of current Suyo when the contactor is opened apparatus.   5. The device according to claim 1, further comprising: a resistor connected in series to the current detector; and a third capacitor connected in parallel to the current detector and the resistor. The electric vehicle control apparatus according to one.

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