JP2839867B2 - Electric car control device - Google Patents

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 each of which converts DC power into AC power and supplies the AC power to an electric vehicle drive motor, and an electric vehicle auxiliary circuit which converts DC power into AC power. And an auxiliary power converter for supplying electric power to the electric vehicle.

[0002]

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

This is because a large-capacity self-extinguishing semiconductor device such as a GTO thyristor has been put to practical use, and an inverter that has no contacts or circuit parts and is easy to maintain can be realized in a practical size for a vehicle. Because it became.

[0004]

However, if the auxiliary power converter breaks down, no AC power is supplied to the electric vehicle auxiliary circuit, and all the electric blowers and control circuits for cooling do not operate, resulting in a system down. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an electric vehicle control device capable of avoiding a system down due to a failure of an auxiliary power converter.

[0006]

In order to achieve the above-mentioned object, according to the first aspect of the present invention, DC power is converted into AC power having a variable voltage and variable frequency and converted into a plurality of electric vehicle drive motors. A plurality of main power converters that respectively supply AC power with variable voltage frequency, and auxiliary power that converts DC power into AC power with constant voltage and constant frequency and supplies AC power with constant voltage and constant frequency 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 the DC power to a variable voltage variable frequency AC power, and the main power converter converts the DC power to a constant voltage and constant frequency. Switching to select one of a constant voltage / constant frequency control unit that generates a drive signal for converting to AC power, a drive signal from the variable voltage variable frequency control unit, and a drive signal from the constant voltage / constant frequency control unit And a drive signal from the variable voltage variable frequency control unit selected by the switching means in the normal state and output to the main power converter, and the switching means is selected when the auxiliary power converter is abnormal. 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 at a 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 of a frequency.

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

[0008] Therefore, in the invention described in claim 1 or 2, when only one auxiliary power converter is faulty, the main power converter is switched and connected to the electric vehicle auxiliary circuit. Since the main power converter operates in the common section so as to output AC power to be supplied to the electric vehicle auxiliary circuit, even if the auxiliary power converter fails, the system can be prevented from going down.

[0009]

FIG. 1 is a configuration diagram of an electric vehicle control device showing the configuration of an embodiment of the present invention. In the figure,
Positive input terminals of VVVF inverters 5a to 5d are connected to the pantograph 1 as a plurality of main power converters via a circuit breaker 2 and a filter reactor 3, respectively.
Its negative input is grounded through wheels. Also,
A filter capacitor 4 is connected between the positive and negative input terminals, and an electric vehicle drive motor (hereinafter, referred to as an output) is connected to the output terminal.
It is called the main motor. ) 6a to 6d are connected. Note that 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 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) for supply is provided. Here, the control unit 7 includes a common unit 7a for driving a switching element (not shown) included in the VVVF inverter 5d, and a VVVF control unit 7b and a CVCF control unit that can be switched and connected to the common unit 7a in conjunction with the switching device 8. 7c
It is composed of

A CVCF inverter 9 whose input side is constructed in the same manner as these VVVF inverters 5a to 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, an electric vehicle auxiliary circuit such as a control circuit for the VVVF inverters 5a to 5d, and a rectifier for obtaining a DC voltage to be supplied thereto.

The operation of the embodiment constructed as described above will be described below.

First, the VVVF inverters 5a to 5d respectively convert the power collected by the pantograph 1 into VVVF AC power corresponding to the speed command and convert the power to the main motors 6a to 6d.
To supply. 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 state shown in the figure.

Here, the filter reactor 3 and the filter capacitor 4 reduce the ripple of the overhead line voltage and also provide the VVVF inverters 5a to 5d and the CVCF
The high-frequency current generated from the inverter 9 is also reduced.
Further, the waveform filter 10 shapes the AC power waveform output from 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 has failed. If the output of the CVCF inverter 9 becomes zero due to the failure of the CVCF inverter 9 itself or a control circuit for controlling the same, 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 its contact to the opposite side to the illustrated x side, that is, to 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 motors 6a to 6d, it is possible to avoid the system down of the electric vehicle by establishing the power supply to the electric vehicle drive circuit. .

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

FIG. 2 is a configuration diagram of the electric vehicle control device showing the configuration in this case. In the figure, components denoted by the same reference numerals as those in FIG. 1 indicate the same components. In this case, the only difference from FIG. 1 is that the main transformer 12 is provided in response to the AC being taken in from the pantograph 1, and the rectifier circuit 13 is provided at the subsequent stage of the circuit breaker 2.

Thus, also in this embodiment, CVC
When the F inverter 9 fails, the power supply to the electric vehicle auxiliary circuit is established by one VVVF inverter 5d, so that 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, the plurality of main power converters mounted on the electric vehicle are switched and connected to the electric vehicle auxiliary circuit. Since the main power converter operates so as to output the AC power to be supplied to the electric vehicle auxiliary circuit, even if the auxiliary power converter fails, it is possible to avoid a system down.

[Brief description of the drawings]

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pantograph 2 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 13 Rectifier circuit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B60L 1/00-3/12 B60L 11/00-11/18 H02M 7/42-7/98

Claims (2)

(57) [Claims] 1. A plurality of main power converters for converting DC power into AC power having a variable voltage variable frequency and supplying the AC power having a variable voltage variable frequency to a plurality of electric vehicle drive motors, respectively. An auxiliary power converter for converting the DC power into constant voltage constant frequency AC power and supplying the constant voltage constant frequency AC power to the electric vehicle auxiliary circuit; andthe main power converter converts the DC power into a variable voltage variable frequency AC power. A variable voltage variable frequency control unit that generates a drive signal for converting the DC power into a constant voltage and constant frequency control unit that generates a drive signal for converting the DC power into AC power having a constant voltage and constant frequency. Switching means for selecting any one of a drive signal from the variable voltage variable frequency control section and a drive signal from the constant voltage / constant frequency control section; The drive signal from the variable voltage variable frequency control unit is input and output to the main power converter, and when the auxiliary power converter is abnormal, the switching unit selects the constant voltage / constant frequency control unit. By inputting the drive signal and outputting it to the main power converter, the DC power is converted into AC power having a constant voltage and constant frequency, and the AC power having the constant voltage and constant frequency is supplied to the electric vehicle auxiliary circuit. An electric vehicle control device comprising: a common unit that controls the main power converter to supply the electric power. 2. The electric vehicle control device according to claim 1, wherein an AC side of the main power converter is disconnected from the electric vehicle drive motor in conjunction with the switching means, and an AC side of the auxiliary power converter is connected. 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 supply means for supplying an output of the main power converter to the electric vehicle auxiliary circuit.