JPH04334902A - Controller for electric street car - Google Patents

Abstract

PURPOSE:To obtain a necessary electric drive torque even when any of a plurality of power converters for motors is defective. CONSTITUTION:For example, when an inverter 13 becomes defective, drive torque becomes insufficient only by three AC motors M1, M2, M3, and an electric street car cannot be restarted from the midway of an ascent. Then, a contact of a switch S2 is switched only for a short time until the restart is finished, and a switch S5 is opened. Thus, the motor M2 can be driven by using an inverter I5 to obtain a necessary drive force.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vehicle control device for operating a drive motor and auxiliary equipment using a power converter such as an inverter.

0002

2. Description of the Related Art FIG. 2 is an explanatory diagram showing a schematic configuration of a conventional electric vehicle control device. In this figure, DC power from overhead wire 1 is collected by pantograph 2, and switch L1
~ L4 and L5 are supplied to inverters I1 to I4 as electric motor power converters, and inverter I5' as an auxiliary equipment power converter.

[0003]Four AC motors M1 to M4 as driving electric motors and auxiliary equipment 3 such as an air conditioner blower are connected to these inverters I1 to I4 and I5.
Operation is performed by variable voltage variable frequency control.

0004

[Problem to be Solved by the Invention] By the way, one of the inverters I1 to I4 has failed, so instead of operating with four AC motors M1 to M4, it is now operated with three AC motors. In this case, it is usually possible to continue driving the vehicle, although the performance of the vehicle will deteriorate.

[0005] However, in cases where an electric locomotive is pulling freight cars or passenger cars that have a large number of connections and are heavy, the electric locomotive may have to stop once on an uphill slope and then restart. In some cases, the starting torque is insufficient with only three AC motors, and restarting may not be possible.

[0006] The present invention has been made in view of the above circumstances, and provides electric vehicle control that can secure the necessary electric vehicle drive torque even if any of the electric motor power converters is in a malfunctioning state. The purpose is to provide equipment.

[0007]

[Means for Solving the Problems] As a means for solving the above-mentioned problems, the present invention has a plurality of electric motor power converters installed corresponding to each of a plurality of driving electric motors, and a plurality of power converters for auxiliary equipment. An electric vehicle control device comprising a power converter, and each power converter performs variable voltage and variable frequency control of its output based on power input from an overhead line, each of the drive motors and the power converter for each of the motors. a plurality of output switching means connected between the auxiliary equipment and the auxiliary equipment power converter, which can supply the output of the auxiliary equipment power converter to the connected drive motor by a switching operation; and the auxiliary equipment and the auxiliary equipment power converter. and output cutoff means connected between the plurality of electric motor power converters, and when any of the plurality of electric motor power converters fails and it is necessary to ensure sufficient electric vehicle drive torque, the failed electric motor The output switching means related to the power converter for auxiliary equipment performs a switching operation, and the output cutoff means performs a cutoff operation, and the output of the power converter for auxiliary equipment is switched to the power converter for driving the failed motor power converter. The configuration is such that the power is supplied to an electric motor.

[0008]

[Operation] A large electric vehicle drive torque is required only for a short time, such as when restarting on an uphill slope. On the other hand, even if the operation of auxiliary equipment such as an air conditioner blower is interrupted for a short period of time, no problem will arise in practice. Therefore, if the auxiliary equipment power converter is used as the electric motor power converter for a short period of time, the necessary electric vehicle drive torque can be secured. In other words, if one of the multiple electric motor power converters fails and it is necessary to ensure electric vehicle drive torque above a certain level, the output connected to the failed electric motor power converter must be The switching means performs a switching operation, and the output cutoff means performs a cutoff operation to cut off the output of the auxiliary equipment power converter to the auxiliary equipment.

[0009] As a result, the output of the auxiliary equipment power converter is supplied to the failed electric motor power converter, and the necessary electric vehicle torque is ensured.

0010

[Embodiment] An embodiment of the present invention will be described below with reference to FIG. However, the same reference numerals are given to the same components as in FIG. 2, and redundant explanation will be omitted.

In FIG. 1, inverters I1 to I4
Switches S1 to S4 as output switching means are connected between the AC motors M1 to M4 and the AC motors M1 to M4, respectively. A switch S5 serving as an output cutoff means is connected between the inverter I5 and the auxiliary equipment 3. Note that, unlike the inverter I5' in FIG. 2, the inverter I5 has substantially the same capacity, specifications, etc. as the inverters I1 to I4 in order to have good substitutability with the inverters I1 to I4.

Next, the operation of this embodiment configured as described above will be explained. First, when normal operation is performed, the contacts of the switches S1 to S5 are in the state as shown in the diagram, and the AC motors M1 to M4 and the auxiliary equipment 3
are operated by outputs from inverters I1 to I4 and inverter I5, respectively.

For example, if the inverter I2 fails, the switch L2 is turned off and the operation of the AC motor M2 is stopped. Therefore, the number of operating motors is reduced from four to three, and the driving force of the electric vehicle is reduced, but normally, even with three AC motors, operation can be continued.

However, in the case where it is necessary to stop in the middle of an uphill slope, a large driving force is required when restarting, so as mentioned above, three AC motors M1, M3,
There may be cases where it is not possible to restart using M4 alone.

In such a case, the driver switches the contacts of the switch S2 from the inverter I2 side to the inverter I5 side by operating an operating device (not shown), and also opens the contacts of the switch S5. As a result, the AC power that had been output from the inverter I5 to the auxiliary equipment 3 is now output to the AC motor M2. Therefore, the electric vehicle can secure the driving torque before the failure of the inverter I2, and can smoothly restart the electric vehicle.

[0016] After the restart is successfully carried out and the speed of the electric car increases above a certain level, it no longer requires that much driving torque, and the three AC motors M1, M3,
There is no particular problem when driving with M4. Therefore, the driver closes the contact of the switch S5 and switches the contact of the switch S2 from the inverter I5 side to the inverter I2 side. As a result, the AC power from the inverter I5 that was being output to the AC motor M2 side is again output to the auxiliary equipment 3.

[0017] During this time, auxiliary equipment 3 such as a blower fan etc.
Although the operation of the air conditioner is temporarily stopped, this time is not very long, and there is no problem in practice if the thermal time constant of the air conditioner is taken into account.

In the above embodiment, there are four power converters for the electric motor.
Although the case has been described in which there is one power converter for auxiliary equipment in each unit, the number of these converters is not limited to this, of course.

Further, in the above embodiment, the switches S1 to
Although it is assumed that S5 is configured to perform switching operations or opening/closing operations by manual operation by the driver, it is also possible to adopt a configuration in which these operations are performed automatically.

[0020]

As described above, according to the present invention, even if one of the plurality of electric motor power converters fails, the failed converter can be replaced by the auxiliary equipment power converter. With this configuration, it is possible to secure the necessary electric vehicle drive torque.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional example.

[Explanation of symbols]

1 Overhead line 3 Auxiliary equipment I1 to I4 Electric motor power converter (inverter)
I5 Power converter (inverter) for auxiliary equipment S1
~S4 Output switching means (switch) S5 Output cutoff means (switch)

Claims (1)

[Claims] Claim 1: A plurality of electric motor power converters installed corresponding to each of a plurality of driving electric motors;
An electric vehicle control device having a power converter for auxiliary equipment, each power converter controlling its output with variable voltage and variable frequency based on input power from an overhead line, each of the drive motors and each of the motors a plurality of output switching means connected between the power converters for the auxiliary equipment and capable of supplying the output of the power converter for the auxiliary equipment to the connected drive motor by a switching operation; an output cutoff means connected between the power converters, and when any of the plurality of electric motor power converters fails and it is necessary to ensure sufficient electric vehicle drive torque,
The output switching means associated with the failed motor power converter is made to perform a switching operation, and the output cutoff means is made to perform a cutoff operation, so that the output of the auxiliary equipment power converter is
An electric vehicle control device characterized by supplying power to a driving electric motor related to a failed electric motor power converter.