JPH08242501A - Electric car control device - Google Patents

Abstract

It is an object of the present invention to provide an electric vehicle control device capable of avoiding a system down with respect to a failure of a CVCF inverter equipped with only one unit. A control unit includes a VVVF control unit 7b that generates a drive signal for a VVVF inverter 5d to output VVVF AC power, and a VVVF inverter 5d that is a CV.
CV that generates a drive signal for outputting CF AC power
The CF control unit 7c and the drive signal from the VVVF control unit 7b during normal time are input and output to the VVVF inverter 5d. When the auxiliary power converter 9 is abnormal, the drive signal from the CVCF control unit 7c is output. By inputting and outputting to the VVVF inverter 5d, the VVVF inverter 5d is configured to have a common unit 7a that controls to supply CVCF AC power to the electric vehicle auxiliary circuit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of main power converters for converting DC power into AC power and supplying the AC power to an electric car drive motor, and an electric car auxiliary circuit for converting DC power into AC power. And an auxiliary electric power converter for supplying electric power to the electric vehicle controller.

[0002]

2. Description of the Related Art In recent years, even in a high-power electric vehicle such as an electric locomotive whose output is 1000 kW or more, a variable voltage variable frequency (hereinafter, VV) is used as a main power converter for controlling an electric vehicle drive motor.
It is called VF. ) Inverters have been put to practical use. In this case, the electric power source for the electric vehicle auxiliary circuit such as the control circuit of the VVVF inverter, the circuit for driving the electric blower for cooling the resistors, etc. is replaced with the conventional motor generator, and the constant voltage constant frequency is used. (Hereinafter, referred to as CVCF.) Inverters have come to be used.

This is because a large-capacity self-arc-extinguishing semiconductor element such as a GTO thyristor is put into practical use, and an inverter that does not have contacts or circuit parts and is easy to maintain can be realized in a practical size for use in a vehicle. Because it became.

[0004]

However, when the auxiliary power converter fails, AC electric power is not supplied to the electric vehicle auxiliary circuit, and the cooling electric blower and the control circuit do not all operate and the system goes down. There was a problem.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain an electric vehicle controller capable of avoiding a system down due to a failure of an auxiliary power converter.

[0006]

In order to achieve the above-mentioned object, the invention according to claim 1 converts DC power into AC power having a variable voltage and variable frequency and converts the AC power into a plurality of electric vehicle drive motors. A plurality of main power converters that respectively supply variable-frequency alternating-current power, and auxiliary power that converts direct-current power to constant-voltage constant-frequency alternating-current power and supplies constant-voltage constant-frequency alternating-current power to the electric vehicle auxiliary circuit. A converter, a variable voltage variable frequency control unit that generates a drive signal for the main power converter to convert DC power to AC power of variable voltage variable frequency, and the main power converter converts DC power to constant voltage constant frequency. Switching for selecting one of a constant voltage constant frequency control unit that generates a drive signal for converting to AC power, a drive signal from a variable voltage variable frequency control unit, and a drive signal from the constant voltage constant frequency control unit And the drive signal from the variable voltage variable frequency control unit selected by the switching unit during normal operation and output to the main power converter, and when the auxiliary power converter is abnormal, the switching unit selects By inputting the drive signal from the constant voltage constant frequency control unit and outputting it to the main power converter, the DC power is converted to AC power of constant voltage constant frequency and the constant voltage constant is supplied to the electric vehicle auxiliary circuit. And a common unit that controls the main power converter to supply AC power at a frequency.

According to a second aspect of the present invention, in the first aspect of the invention, the AC side of the main power converter is disconnected from the electric vehicle drive motor in conjunction with the switching means, and the AC of the auxiliary power converter is changed. The electric vehicle auxiliary circuit is separated from the electric vehicle auxiliary circuit, the AC side of the main power converter is connected to the electric vehicle auxiliary circuit, and a supply means for supplying the output of the main power converter to the electric vehicle auxiliary circuit is provided.

Therefore, in the invention described in claim 1 or 2, when the auxiliary power converter having only one unit fails, the main power converter is switched and connected to the electric vehicle auxiliary circuit, and Since this main power converter operates in the common part so as to output the AC power supplied to the electric vehicle auxiliary circuit, it is possible to avoid system down even if the auxiliary power converter fails.

[0009]

1 is a block diagram of an electric vehicle controller showing the structure of an embodiment of the present invention. In the figure,
The pantograph 1 is connected to the positive input terminals of the VVVF inverters 5a to 5d as a plurality of main power converters via the circuit breaker 2 and the filter reactor 3, respectively.
Its negative input end is grounded through the wheel. Also,
A filter capacitor 4 is connected between each of the positive and negative input terminals, and an electric car drive motor (hereinafter,
The main motor. ) 6a-6d are connected. In addition, V of these VVVF inverters 5a to 5d
The VVF inverter 5d is controlled by the control unit 7, which can also be driven as a CVCF inverter.

A switching device 8 is provided for switching the output of the VVVF inverter 5d from the main motor 6d to a three-phase auxiliary circuit (hereinafter referred to as an electric vehicle auxiliary circuit), which will be described later. Here, the control unit 7 is a common unit 7a for driving a switching element (not shown) that constitutes the VVVF inverter 5d, and a VVVF control unit 7b and a CVCF control unit that are switchably connectable to the common unit 7a in conjunction with the switching device 8. 7c
It consists of and.

A CVCF inverter 9 whose input side is constructed in the same manner as these VVVF inverters 5a-5d.
It has. The output terminal of the CVCF inverter 9 is
The primary side of the transformer 11 is connected via the normally closed contact of the switching device 8 and the waveform filter 10. The secondary side of the transformer 11 is connected to a cooling electric blower, a control circuit for the VVVF inverters 5a to 5d, and an electric vehicle auxiliary circuit such as a rectifying device that obtains a DC voltage to be supplied to the control circuit.

The operation of this embodiment configured as described above will be described below.

First, the VVVF inverters 5a to 5d respectively convert the electric power collected by the pantograph 1 into VVVF AC electric power corresponding to the speed command to convert the main electric motors 6a to 6d.
Supply to. In this case, the CVCF inverter 9 converts the DC power collected by the pantograph 1 into CVCF AC power and supplies it to the electric vehicle auxiliary circuit. Further, the switching device 8 is held in the illustrated state.

Here, the filter reactor 3 and the filter capacitor 4 reduce the ripple component of the overhead wire voltage, and each VVVF inverter 5a-5d and CVCF.
The high frequency current generated from the inverter 9 is also reduced.
Further, the waveform filter 10 shapes the AC power waveform output by the CVCF inverter 9 into a sine wave and supplies the sine wave to the transformer 11.

Next, consider the case where the CVCF inverter 9 fails. If the output of the CVCF inverter 9 becomes zero due to a failure of the CVCF inverter 9 itself or a control circuit that controls the CVCF inverter 9, the secondary voltage of the transformer 11 also becomes zero. Thus, when the secondary voltage becomes zero,
The switching device 8 detects this and switches and connects the contact to the side opposite to the illustrated x side, that is, the y side. That is, C
Instead of the VCF inverter 9, one predetermined VV
The VF inverter circuit 5d is connected to the waveform filter 10, and the CVCF control unit 7c is switched and connected to the common unit 7a instead of the VVVF control unit 7b. By thus providing the common unit 7a in common for the VVVF control unit 7b and the CVCF control unit 7c, the control device can be simplified.

As a result, one VVVF inverter 5d operates as a CVCF inverter, and its output is supplied to the transformer 11 via the waveform filter 10.

Although it is impossible to drive all of the plurality of main electric motors 6a to 6d, the system down as an electric vehicle can be avoided by establishing the power source for the electric vehicle drive circuit. .

Although the above embodiment is directed to a system for inputting direct current from an overhead line, the present invention is not limited to this and can be applied to a system for inputting alternating current from an overhead line.

FIG. 2 is a block diagram of an electric vehicle controller showing the configuration in this case. In the figure, the parts denoted by the same reference numerals as those in FIG. 1 indicate the same elements. In this case, it differs from FIG. 1 only in that the main transformer 12 is provided in response to the intake of the alternating current from the pantograph 1 and that the rectifier circuits 13 are respectively provided at the subsequent stages of the breaker 2.

Thus, also in this embodiment, the CVC
When the F inverter 9 fails, one VVVF inverter 5d establishes the power supply for the electric vehicle auxiliary circuit, and the system down of the electric vehicle can be avoided.

[0021]

As is apparent from the above description, according to the present invention, when the auxiliary power converter fails, a plurality of main power converters mounted on it are switched and connected to the electric vehicle auxiliary circuit. Since the main power converter operates so as to output the AC power supplied to the electric vehicle auxiliary circuit, the system down can be avoided even if the auxiliary power converter fails.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an electric vehicle control device showing an embodiment of the present invention.

FIG. 2 is a configuration diagram of an electric vehicle control device showing another embodiment.

[Explanation of symbols]

 1 Pantograph 2 Circuit breaker 3 Filter reactor 4 Filter capacitor 5a-5d VVVF inverter 6a-6d Main motor 7 Control part 7a Common part 7b VVVF control part 7c CVCF control part 8 Switching device 9 CVCF inverter 10 Waveform filter 11 Transformer 12 Main transformer Device 13 rectifier circuit

Claims (2)

[Claims] 1. A plurality of main power converters for converting direct-current power into alternating-current power having a variable-voltage variable frequency to respectively supply the variable-voltage variable-frequency alternating-current power to a plurality of electric vehicle drive motors, and direct-current power. To an AC power of constant voltage and constant frequency, and an auxiliary power converter that supplies the constant voltage and constant frequency of AC power to the electric vehicle auxiliary circuit; and the main power converter converts DC power to variable voltage and variable frequency of AC power. And a constant voltage constant frequency controller for generating a drive signal for converting the direct current power into the constant voltage constant frequency alternating current power by the main power converter. Switching means for selecting one of the drive signal from the variable voltage variable frequency control section and the drive signal from the constant voltage constant frequency control section, and normally, the switching means selects When the drive signal from the variable voltage variable frequency control unit is input and output to the main power converter, when the auxiliary power converter is abnormal, the constant voltage constant frequency control unit selected by the switching unit is output from the constant voltage constant frequency control unit. Drive signal is input and output to the main power converter to convert the DC power to AC power having a constant voltage and constant frequency, and the AC power having the constant voltage and constant frequency to the electric vehicle auxiliary circuit. An electric vehicle control device having a common unit for controlling the main power converter to supply the electric power. 2. The electric vehicle control device according to claim 1, wherein the AC side of the main power converter is separated from the electric vehicle drive motor in cooperation with the switching means, and the AC side of the auxiliary power converter. Is separated from the electric vehicle auxiliary circuit, the AC side of the main power converter is connected to the electric vehicle auxiliary circuit,
An electric vehicle control device having a supply means for supplying the output of the main power converter to the electric vehicle auxiliary circuit.