JP3260066B2 - 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 VVVF power converters for converting DC power into AC power having a variable voltage and variable frequency (hereinafter referred to as VVVF) and supplying the AC power to an electric vehicle drive motor. The present invention relates to an electric vehicle control device including a CVCF power converter that converts electric power into AC power having a constant voltage and constant frequency (hereinafter, referred to as CVCF) and supplies the AC power to an electric vehicle auxiliary circuit.

[0002]

2. Description of the Related Art In an electric vehicle provided with a plurality of VVVF power converters for supplying VVVF AC power to an electric vehicle drive motor and one CVCF power converter for supplying CVCF AC power to an electric vehicle auxiliary circuit, By controlling one of the VVVF power converters to supply the CVCF AC power to the electric vehicle auxiliary circuit when the CVCF power converter fails, the electric air compressor or battery which is the load of the electric vehicle auxiliary circuit is controlled. The charger, the electric blower for cooling, etc. are operated normally, and the operation of the electric car is continued. An example of this control device is disclosed in Japanese Patent Application Laid-Open No. 3-98401.

[0003]

In the circuit diagram shown in FIG. 1 of JP-A-3-98401, the circuit breakers 2 are provided in front of a plurality of VVVF power converters 5, respectively. In many cases, a common circuit breaker is provided between two VVVF power converters and a power supply. This is because a plurality of VVVF power converters are required to control the electric vehicle drive motor individually, but there is no particular need to provide a breaker individually, and since it is a contact device, it requires maintenance. This is because it is preferable to make them common. FIG. 8 is a configuration diagram of the electric vehicle control device. The pantograph 1 has a circuit breaker 2 and filter reactors 3a to 3d.
Positive input terminals of a plurality of VVVF power converters (hereinafter referred to as VVVF inverters) 5a to 5d are connected, and negative input terminals thereof are grounded through wheels. Also, VVVF
A filter capacitor 4 is connected between the positive and negative input terminals of the inverters 5a to 5d, and an electric vehicle drive motor (hereinafter, referred to as a main motor) 6a to 6d is provided at an output terminal.
Is connected. Note that a predetermined VVVF inverter 5d among these VVVF inverters 5a to 5d is
It is controlled by the control unit 7 so that it can be driven also as a CVCF inverter. The control unit 7 is an inverter control common unit (hereinafter, referred to as a common unit) 7 for driving a switching element included in the VVVF inverter 5d.
a, VVVF for generating a drive signal for operating a switching element so as to convert DC power to VVVF AC power
The control unit 7b generates a drive signal for operating a switching element that converts DC power into CVCF AC power.
It is composed of an F control unit 7c and a switching unit 8 that controls switching switches 81 to 83 to be described later.

A positive input terminal of a CVCF power converter (hereinafter referred to as a CVCF inverter) 9 is connected to the pantograph 1 via a circuit breaker 2b and a filter reactor 3e, and a negative input terminal thereof is grounded through wheels. Have been. A filter capacitor 4 is connected between the positive and negative input terminals of the CVCF inverter 9, and a primary side of a transformer 11 is connected to an output terminal via a waveform filter circuit 10. A VVVF inverter 5 is provided on the secondary side of the transformer 11.
An electric vehicle auxiliary circuit 14 such as a control circuit for a to 5d and a circuit for driving an electric blower for cooling a resistor and the like is connected.

Further, a common unit 7a and a VVVF control unit 7b
Switch 81, VV between the CVCF and the CVCF controller 7c
A changeover switch 82 between the VF inverter 5d and the main motor 6d, and a CVCF inverter 9 and a waveform filter circuit 10
And a changeover switch 83 is provided between them, and these changeover switches 81 to 83 are controlled by the changeover unit 8 and operate in conjunction with each other.

In the electric vehicle control device thus configured, when the CVCF inverter 9 is out of order, the switching unit 8 detects the failure, and switches the changeover switches 81 to 83 to the opposite side (y). Terminal side). further,
The circuit breaker 2b is opened. Then, the CVCF inverter 9
Is separated from the electric vehicle auxiliary circuit 14, and a predetermined VVVF inverter 5d is replaced by a predetermined VVVF inverter 5d.
d and is connected to the waveform filter circuit 10 and the CVCF controller 7c is used instead of the VVVF controller 7b.
Are switched and connected to the common unit 7a. Therefore, since the VVVF inverter 5d operates as a CVCF inverter, its output is supplied to the transformer 11 via the waveform filter circuit 10.

The VVVF inverter 5 in such a state
When an overcurrent flows due to a disconnection of the pantograph 1 or the like in a to 5c, the protection operation is activated, and the circuit breaker 2a may be opened. Also, when a command such as a powering command off is issued from the driver's cab, the circuit breaker 2a is similarly opened. Then, VVVF operating as a power supply of the electric vehicle auxiliary circuit 14
Since the power supply to the inverter 5d is also cut off, there is a problem that power cannot be supplied to the electric vehicle auxiliary circuit 14.

When the CVCF inverter 9 fails in the electric vehicle control device configured as described above, the CVCF inverter 9 is disconnected from the electric vehicle auxiliary circuit 14 and is replaced with a predetermined predetermined electric vehicle. When the VVVF inverter 5d is separated from the main motor 6d and connected to the waveform filter circuit 10, the electric vehicle auxiliary circuit 14 can obtain electric power.
There is a problem that the performance is reduced by the driving capability of the main motor 6d, and sufficient performance cannot be obtained when a driving force such as an uphill is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a VVV AC power supply to a main motor when a CVCF inverter fails.
Regardless of the state of the F inverter, always to the electric vehicle auxiliary circuit C
An object of the present invention is to provide an electric vehicle control device that continuously supplies VCF AC power.

Another object of the present invention is to provide an electric vehicle control device that does not reduce the driving force of the electric vehicle when the CVCF inverter fails, and that continues to supply CVCF AC power to the electric vehicle auxiliary circuit.

[0011]

According to a first aspect of the present invention, an input side is connected to a power source via a first circuit breaker, and an output side is connected to an electric vehicle drive motor. A plurality of variable voltage variable frequency power converters that convert DC power into variable voltage variable frequency AC power and supply the variable voltage variable frequency AC power to the electric vehicle drive motor, respectively; Is connected through a second circuit breaker, and the output side is connected to an electric vehicle auxiliary circuit, and converts the DC power to constant-voltage / constant-frequency AC power to provide the electric-vehicle auxiliary circuit with the constant-voltage / constant-frequency AC power. A constant-voltage / constant-frequency power converter for supplying the constant-voltage / constant-frequency power converter or the constant-voltage / constant-frequency power converter for controlling the constant-voltage / constant-frequency power converter. A variable voltage variable frequency power converter between a circuit breaker and the constant voltage constant frequency power converter, and a predetermined one of the first circuit breaker and the plurality of variable voltage variable frequency power converters; And a first switch means for connecting between the second circuit breaker and the predetermined one variable voltage variable frequency power converter, and a predetermined variable voltage variable frequency power converter And second switch means for connecting the output side of the electric vehicle to the electric vehicle auxiliary circuit.

The invention described in claim 2 is the first invention.
In the invention described in the above, when the constant voltage / constant frequency power converter or the constant voltage / constant frequency control unit that controls the constant voltage / constant frequency power converter fails, the predetermined one variable voltage / variable frequency power converter Is separated from the electric vehicle drive motor, the output side of the constant voltage / constant frequency power converter is disconnected from the electric vehicle auxiliary circuit, and the output side of the predetermined one variable voltage variable frequency power converter is A control unit connected to the electric vehicle auxiliary circuit and configured to control the one variable voltage variable frequency power converter to convert the DC power into AC power having a constant voltage and a constant frequency.

According to a third aspect of the present invention, in the first aspect of the present invention, the first switch means comprises a first circuit breaker and the predetermined one variable voltage variable frequency power converter. A first switch provided therebetween; a second switch provided between the second circuit breaker and the constant voltage / constant frequency power converter; a second switch provided between the second circuit breaker and the predetermined one;
And a connection switch for connecting between the two variable voltage variable frequency power converters.

According to a fourth aspect of the present invention, there are provided a plurality of first filter circuits each connected to a power supply via a first circuit breaker, and an input side connected to the first filter circuit and an output connected to the first filter circuit. A plurality of variable voltage variable frequency power supplies, each of which is connected to an electric vehicle drive motor and supplies DC power to the electric vehicle drive motor by converting DC power into variable voltage variable frequency AC power. A converter, a second filter circuit respectively connected to the power supply via a second circuit breaker, an input side connected to the second filter circuit, an output side connected to the electric vehicle auxiliary circuit, A constant-voltage / constant-frequency power converter that converts the constant-voltage / constant-frequency AC power to the electric vehicle auxiliary circuit and supplies the constant-voltage / constant-frequency AC power to the electric vehicle auxiliary circuit. When the constant voltage / constant frequency control unit for controlling the constant voltage / constant frequency power converter is out of order, the second circuit breaker and the second filter circuit and the first circuit breaker And first switch means for opening a predetermined one of the plurality of first filter circuits and connecting between the second circuit breaker and the predetermined one filter circuit; And second switch means for connecting the output side of the variable voltage variable frequency power converter connected to the predetermined filter circuit to the electric vehicle auxiliary circuit.

[0015] Further, the invention according to claim 5 is based on claim 4.
In the invention described above, when the constant-voltage / constant-frequency power converter or the constant-voltage / constant-frequency control unit that controls the constant-voltage / constant-frequency power converter fails, the variable voltage connected to the predetermined one filter circuit is used. The output side of the voltage variable frequency power converter was separated from the electric vehicle drive motor, and the output side of the constant voltage / constant frequency power converter was separated from the electric vehicle auxiliary circuit and connected to the predetermined one filter circuit. An output side of the variable voltage variable frequency power converter is connected to the electric vehicle auxiliary circuit, and the variable voltage variable frequency power converter connected to the predetermined one filter circuit converts the DC power to a constant voltage and constant frequency. And a control unit that controls the conversion into AC power.

According to a sixth aspect of the present invention, in the fourth aspect of the invention, the first switch means is provided between the first circuit breaker and the predetermined one filter circuit. 1 switch, a second switch provided between the second circuit breaker and the second filter circuit, and a switch between the second circuit breaker and the predetermined one filter circuit. And a connection switch for connection.

[0017] According to a seventh aspect of the present invention, the DC power is supplied to the first power supply.
A plurality of main power converters for converting the AC power into the AC power and supplying the first AC power to the plurality of electric vehicle drive motors, and an electric vehicle auxiliary circuit for converting the DC power into the second AC power An auxiliary power converter that supplies the second AC power to the electric vehicle drive motor, and when the auxiliary power converter has an abnormality, outputs a predetermined one of the plurality of main power converters to the electric vehicle drive motor. Disconnecting, disconnecting the output side of the auxiliary power converter from the electric vehicle auxiliary circuit, connecting the output side of the predetermined one main power converter to the electric vehicle auxiliary circuit, A control unit for connecting an electric motor in parallel with the other electric vehicle drive electric motor.

[0018]

[0019]

According to the above-mentioned structure, the first to sixth aspects of the present invention will be described.
In the invention described in the above, when the constant voltage / constant frequency power converter or the constant voltage / constant frequency control unit for controlling the constant voltage / constant frequency power converter fails, the second variable voltage variable frequency power controlled by the control unit The converter or one predetermined variable voltage variable frequency power converter has a constant voltage constant frequency power converter different from the first circuit breaker connected to the input side of another variable voltage variable frequency power converter. DC power is supplied via a second circuit breaker connected to the input side of the power supply. Therefore, even when the first circuit breaker is opened in another variable voltage variable frequency power converter, the second variable voltage variable frequency power converter or a predetermined one variable voltage variable frequency power converter Since the DC power continues to be supplied to the converter, it is possible to always supply stable AC voltage and constant frequency AC power to the electric vehicle auxiliary circuit.

According to the present invention, when the constant-voltage / constant-frequency power converter or the constant-voltage / constant-frequency control unit for controlling the constant-voltage / constant-frequency power converter breaks down, the second voltage and the second constant-frequency power can be controlled. , The filter constant viewed from the circuit breaker can be made the same as the normal time.

According to the present invention, when an abnormality occurs in the auxiliary power converter, the output side of a predetermined one of the plurality of main power converters is disconnected from the electric vehicle drive motor, and the auxiliary power conversion is performed. The output side of the electric vehicle is separated from the electric vehicle auxiliary circuit, the output side of one predetermined main power converter is connected to the electric vehicle auxiliary circuit, and the separated electric vehicle drive motor is paralleled with another electric vehicle drive motor. , The driving force of the electric vehicle drive motor is maintained. Further, by being connected in parallel with another electric vehicle drive motor, a centralized control configuration is achieved in which at least two electric vehicle drive motors are connected to one main power converter. It is possible to improve the adhesive strength, which is a merit of the above configuration.

[0023]

Embodiments 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 device according to a first embodiment of the present invention. Each of the pantographs 1 has a filter reactor 3 via a circuit breaker 2a.
a to 3d are connected, and the positive input terminals of a plurality of VVVF power converters (hereinafter referred to as VVVF inverters) 5a to 5d are connected, and the negative input terminals are grounded through wheels. In addition, the positive of the VVVF inverters 5a to 5d,
A filter capacitor 4 is connected between the negative input terminals, and an electric vehicle drive motor (hereinafter, referred to as a main motor) 6a to 6d is connected to the output terminal. Note that a predetermined V of the VVVF inverters 5a to 5d is
The VVF inverter 5d is controlled by the control unit 7 so that it can be driven also as a CVCF inverter. The control unit 7 includes an inverter control common unit (hereinafter, referred to as a common unit) 7a for driving a switching element included in the VVVF inverter 5d, and a drive signal for operating the switching element to convert DC power to VVVF AC power. The VVVF control unit 7b to generate the DC power
It comprises a CVCF control unit 7c for generating a drive signal for operating a switching element so as to convert to VCF AC power, and a switching unit 8 for controlling switching switches 81 to 83, switches 84 and 85, and a connection switch 86 to be described later. I have.

A positive input terminal of a CVCF power converter (hereinafter referred to as a CVCF inverter) 9 is connected to the pantograph 1 via a circuit breaker 2b and a filter reactor 3e, and a negative input terminal thereof is grounded through wheels. Have been. A filter capacitor 4 is connected between the positive and negative input terminals of the CVCF inverter 9, and a primary side of a transformer 11 is connected to an output terminal via a waveform filter circuit 10. A VVVF inverter 5 is provided on the secondary side of the transformer 11.
An electric vehicle auxiliary circuit 14 such as a control circuit for a to 5d and a circuit for driving an electric blower for cooling a resistor and the like is connected.

Further, the common unit 7a and the VVVF control unit 7b
Switch 81, VV between the CVCF and the CVCF controller 7c
A changeover switch 82 is provided between the VF inverter 5d and the main motor 6d, a changeover switch 83 is provided between the CVCF inverter 9 and the waveform filter circuit 10, and a switch 84 is provided between the circuit breaker 2a and the filter reactor 3d. Circuit breaker 2b
A switch 85 is provided between the filter reactor 3e and the filter reactor 3e, and a connection switch for connecting the circuit breaker 2b and the filter reactor 3d is provided. These changeover switches 81 to 83,
The switches 84 and 85 and the connection switch 86 are controlled by the switching unit 8 and operate in conjunction with each other.

The operation of the first embodiment configured as described above will be described. Normally, the changeover unit 8 holds the changeover switches 81 to 83 on the x terminal side, closes both the switches 84 and 85 (hereinafter, referred to as ON), and opens the connection switch 86 (hereinafter, referred to as OFF). ing. Therefore VVV
The F inverters 5a to 5d convert the DC power collected by the pantograph 1 into VVVF AC power corresponding to the operation command and supply the converted power to the main motors 6a to 6d. Also, C
The VCF inverter 9 converts the DC power collected by the pantograph 1 into CVCF AC power and supplies it to the electric vehicle auxiliary circuit 14.

Here, the filter reactors 3a to 3e and the filter capacitor 4 not only reduce the overhead voltage ripple but also provide VVVF inverters 5a to 5d and CVs.
The high frequency current generated from the CF inverter 9 is also reduced. The waveform filter circuit 10 is a CVCF inverter 9
Is shaped into a sine wave and supplied to the transformer 11.

Next, a case where the CVCF inverter 9 has failed will be described. If the output of the CVCF inverter 9 becomes zero due to failure of the CVCF inverter 9 itself or a CVCF control unit (not shown) for controlling the CVCF inverter 9, the secondary voltage of the transformer 11 also becomes zero. As described above, when the CVCF inverter 9 fails, the switching unit 8 detects the failure, and switches and connects each of the changeover switches 81 to 83 to the opposite side (the y terminal side) from the state shown in the figure. The switches 84 and 85 are turned off, and the connection switch 86 is turned on.

Then, the CVCF inverter 9 is disconnected from the electric vehicle auxiliary circuit 14 by the changeover switch 83. Then, the output terminal of the VVVF inverter 5d is disconnected from the main motor 6d by the changeover switch 82, and the VVVF inverter 5d is disconnected.
Are connected to the waveform filter circuit 10. Also CV
The CF inverter 9 is separated from the pantograph 1 by a switch 85, and the VVVF inverter 5d is separated from the circuit breaker 2a by a switch 84. When the connection switch 86 is turned on, DC power is supplied to the VVVF inverter 5d from the pantograph 1 via the circuit breaker 2b. Further, a CVCF control unit 7c is switched and connected to the common unit 7a by the changeover switch 81 instead of the VVVF control unit 7b. The CVCF control unit 7c converts the DC power into CVCF
A drive signal for operating a switching element included in the VVVF inverter 5d so as to be converted into AC power is generated and output to the common unit 7a, and the common unit 7a drives the switching element based on the drive signal. Therefore, VVVF
Since the inverter 5d operates as a CVCF inverter, the CVCF AC power output from the VVVF inverter 5d is supplied to the electric vehicle auxiliary circuit 14 via the waveform filter circuit 10 and the transformer 11. Also, since the VVVF inverter 5d receives DC power from the pantograph 1 via the circuit breaker 2b, if the VVVF inverters 5a to 5c generate an overcurrent or the circuit breaker 2a is opened for other reasons, However, the VVVF inverter 5d can continue to supply the CVCF AC power to the electric vehicle auxiliary circuit 14. When the VVVF inverter 5d is disconnected from the main motor 6d, it becomes impossible to drive all of the plurality of main motors 6a to 6d. However, since the power supply to the electric vehicle auxiliary circuit 14 is always established, the electric vehicle The operation can be continued.

As described above, according to the first embodiment, even when the CVCF inverter 9 fails, CVCF power can be supplied from the VVVF inverter 5d to the electric vehicle auxiliary circuit 14 instead of the VVVF inverter 5d. The VVVF inverter 5d can supply the CVCF power to the electric vehicle auxiliary circuit 14 without being affected by the operation states of the other VVVF inverters 5a to 5c.

FIG. 2 is a configuration diagram of an electric vehicle control device according to a second embodiment of the present invention. In this embodiment, VVV
The F inverters 5a to 5c are connected to the pantograph 1 via circuit breakers 2a and filter reactors 3a to 3c, respectively, while the VVVF inverter 5d and the CVCF inverter 9 are connected to the circuit breaker 2b, filter reactors 3d and 3e.
Are connected to the pantograph 1 respectively. Therefore, the VVVF inverters 5a to 5c are normally connected to the circuit breaker 2
While DC power is supplied via a, DC power is supplied to the VVVF inverter 5d and the CVCF inverter 9 via the circuit breaker 2b. When the CVCF inverter 9 or the control unit that controls the CVCF inverter 9 breaks down, the switching unit 8 switches and connects the changeover switches 81 to 83 to the opposite side (the y terminal side) from the state shown in the figure. Therefore, since the VVVF inverter 5d operates as a CVCF inverter, the CV output from the VVVF inverter 5d
The VCF AC power is supplied to the electric vehicle auxiliary circuit 14 via the waveform filter circuit 10 and the transformer 11. The VVVF inverter 5d receives the supply of the DC power from the pantograph 1 via the circuit breaker 2b, so that the other VVVF inverters 5a to 5d receive the DC power.
Even if an overcurrent occurs at 5c or the circuit breaker 2a opens for other reasons, the VVVF inverter 5d can continue to supply the CVCF AC power to the electric vehicle auxiliary circuit 14.

FIG. 3 is a block diagram of an electric vehicle control device according to a third embodiment of the present invention. In this embodiment, VVV
The F inverter 15a has a circuit breaker 2a, a filter reactor 3
is connected to the pantograph 1 via a, and a plurality of main motors 6a to 6c are connected in parallel to the output end. Also V
The VVF inverter 15b is connected to the pantograph 1 via the circuit breaker 2a and the filter reactor 3b, and the output terminal is connected to the main motor 6d. Other configurations and operations are the same as those of the first embodiment. That is, in the present embodiment, VVV for centrally controlling main motors 6a to 6c is used.
VVV for individually controlling F inverter 15a and main motor 6d
This is applied to an apparatus having an F inverter 15b. In this embodiment, the same effect as in the first embodiment can be obtained.

FIG. 4 is a block diagram of an electric vehicle control device according to a fourth embodiment of the present invention. In the present embodiment, VV
The VF inverter 15a is connected to the pantograph 1 via the circuit breaker 2a and the filter reactor 3a, and a plurality of main motors 6a to 6c are connected to the output terminal in parallel. The VVVF inverter 15b and the CVCF inverter 9 are connected to the pandagraph 1 via the circuit breaker 2b and the filter reactors 3b and 3e, respectively. Other configurations and operations are the same as those of the second embodiment. That is, the present embodiment is applied to an apparatus having a centralized control type VVVF inverter 15a and an individual control type VVVF inverter 15b as in the third embodiment. In this embodiment, the same effect as in the second embodiment can be obtained.

In the third and fourth embodiments described above, an example is shown in which three main motors 6a to 6c are connected to the output terminal of the VVVF inverter 15a, but the present invention is not limited to this. The main motors may be connected, and the remaining two main motors may be connected to the output terminal of the VVVF inverter 15b. In this case, since two main motors are connected to the output terminal of the VVVF inverter 15b, when the CVCF inverter 9 fails, the two main motors are disconnected from the VVVF inverter 15b by the changeover switch 82.

FIG. 5 is a configuration diagram of an electric vehicle control device according to a fifth embodiment of the present invention. This embodiment is the same as the first embodiment except that the positions of the switches 87 and 88 and the connection switch 89 are different from those of the first embodiment. That is, the switch 87 is connected between the filter reactor 3d and the VVVF inverter 5d.
The switch 88 is provided between the filter reactor 3e and the CVCF inverter 9, and the connection switch 89 is provided between the filter reactor 3e and the VVVF inverter 5d. Normally, switches 87 and 88 are turned on and connection switch 89
Is off, but the CVCF inverter 9 or CVCF
When the control unit that controls the CF inverter 9 breaks down,
The switches 87 and 88 are turned off and the connection switch 89 is turned on. Therefore, when the CVCF inverter 9 fails, V
The VVF inverter 5d receives supply of DC power from the panda graph 1 via the circuit breaker 2b and the filter reactor 3e. In the present embodiment, the VVVF inverter 5
By setting the constants of the filter capacitors 4 of the CVCF inverter 9 to the same value,
VV viewed from circuit breaker 2b when VCF inverter 9 fails
CVC when the filter constant on the VF inverter 5d side is normal
This is the same as when the F inverter 9 is connected. Therefore, VV
When the VF inverter 5d supplies the CVCF AC power to the electric vehicle auxiliary circuit, the effect of reducing harmonics on the train line can be made the same as in the normal case. FIG. 6 is a configuration diagram of an electric vehicle control device according to a sixth embodiment of the present invention. In the present embodiment, the individual VVVF inverters 5a to 5
Switches 84a to 84d for opening the DC input terminal of 5d are provided. These switches 84a to 84d are normally ON.
It is. When the VVVF inverters 5a to 5d cannot operate due to a failure or the like, the failed VVV
The F-inverter is disconnected by turning off the corresponding switch, and the remaining VVVF inverter is operated normally. In such a system, the switch 84d that disconnects when the VVVF inverter 5d fails has a CVC
When the F inverter 9 fails, the VVVF inverter 5d can also be used as a switch for disconnecting from the circuit breaker 2a.

FIG. 7 is a block diagram of an electric vehicle control device according to a seventh embodiment of the present invention. In the present embodiment, in addition to the first embodiment, a connection switch 90 for connecting the main motor 6d in parallel with the main motor 6c is provided. The connection switch 90 is turned on in conjunction with the changeover switch 82 in response to a control command from the control unit 7. In such a system, when the CVCF inverter 9 fails, the changeover switches 81 to 83 are switched and connected to the opposite side (the y terminal side) from the state shown in the figure. The switches 84 and 85 are turned off, and the connection switch 86 is turned on. Further, the connection switch 90 is turned on. Then, VVVF inverter
The output side of the motor 5d is separated from the main motor 6d, and the CVCF
The output side of the inverter 9 is disconnected from the electric vehicle auxiliary circuit 14. The output side of the VVVF inverter 9 is connected to the electric vehicle auxiliary circuit, and the separated main motor 6d is connected in parallel with the other main motor 6c, so that the main motor 6c is connected.
The driving force of d is maintained. Furthermore, since the two main motors 6c and 6d are connected to one VVVF inverter 5c by being connected in parallel with the main motor 6c, a centralized control type configuration is provided. It is possible to improve the adhesive strength, which is a merit of the above. In this embodiment, the form in which the first embodiment is applied has been described, but the same effects can be obtained when applied to other embodiments.

[0037]

As described above, according to the first to sixth aspects of the present invention, even when the CVCF inverter cannot supply the CVCF AC power to the electric vehicle auxiliary circuit, the VVVF AC power is supplied to the main motor. VVV being supplied
Stable CVCF AC power can be continuously supplied from a predetermined one of the F inverters irrespective of the operation state of the other VVVF inverters.

According to the seventh aspect of the present invention, the CVC
Even if the F inverter cannot supply CVCF AC power to the electric vehicle auxiliary circuit, the output side of the VVVF inverter is connected to the electric vehicle auxiliary circuit, and the separated main motor is connected in parallel with the other main motors. As a result, the driving force of the main motor is maintained. Furthermore, since it is connected in parallel with the other main motors, it becomes a centralized control type configuration in which at least two main motors are connected to one VVVF inverter. Therefore, the merit of the centralized control type configuration is achieved. And the like can be improved.

[Brief description of the drawings]

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

FIG. 2 is a configuration diagram of an electric vehicle control device according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of an electric vehicle control device according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram of an electric vehicle control device according to a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram of an electric vehicle control device according to a fifth embodiment of the present invention.

FIG. 6 is a configuration diagram of an electric vehicle control device according to a sixth embodiment of the present invention.

FIG. 7 is a configuration diagram of an electric vehicle control device according to a seventh embodiment of the present invention.

FIG. 8 is a configuration diagram of a conventional electric vehicle control device.

[Explanation of symbols]

2a, 2b Circuit breaker 3a, 3b, 3c, 3d, 3e Filter reactor 4 Capacitor 5a, 5b, 5c, 5d, 15a, 15b VVVF inverter 6a, 6b, 6c, 6d Main motor 7 Control unit 81, 82, 83 Switch 84, 85, 87, 88 switch 86, 89, 90 connection switch 9 CVCF inverter 14 electric car auxiliary circuit

Claims (7)

(57) [Claims] 1. An electric vehicle drive motor, wherein an input side is connected to a power supply via a first circuit breaker, and an output side is connected to an electric vehicle drive motor, respectively, for converting DC power into AC power of a variable voltage and variable frequency. A plurality of variable voltage variable frequency power converters respectively supplying the variable voltage variable frequency AC power, the input side is connected to the power supply via a second circuit breaker, the output side is connected to the electric vehicle auxiliary circuit, A constant-voltage / constant-frequency power converter that converts the DC power to constant-voltage / constant-frequency AC power and supplies the electric vehicle auxiliary circuit with the constant-voltage / constant-frequency AC power; When the constant-voltage / constant-frequency power converter that controls the constant-voltage / constant-frequency power converter breaks down, between the second circuit breaker and the constant-voltage / constant-frequency power converter and the first circuit breaker Opening a predetermined one of the plurality of variable voltage variable frequency power converters to the variable voltage variable frequency power converter, the second circuit breaker and the predetermined one variable voltage variable power converter. Electric vehicle control having first switch means for connecting to a frequency power converter, and second switch means for connecting an output side of a predetermined variable voltage variable frequency power converter to the electric vehicle auxiliary circuit; apparatus. 2. The electric vehicle control device according to claim 1,
When the constant voltage / constant frequency power converter or the constant voltage / constant frequency control unit that controls the constant voltage / constant frequency power converter fails, the output side of the predetermined one variable voltage / variable frequency power converter is The electric vehicle drive motor is disconnected, the output side of the constant voltage / constant frequency power converter is disconnected from the electric vehicle auxiliary circuit, and the output side of the predetermined one variable voltage variable frequency power converter is connected to the electric vehicle auxiliary circuit. And a controller for controlling the one variable voltage variable frequency power converter to convert the DC power into AC power having a constant voltage and constant frequency. 3. The electric vehicle control device according to claim 1,
The first switch means includes: a first switch provided between the first circuit breaker and the predetermined one variable voltage / variable frequency power converter; A second switch provided between the voltage constant frequency power converter and a connection switch connecting the second circuit breaker and the predetermined one variable voltage variable frequency power converter. Electric car control device. 4. A plurality of first filter circuits respectively connected to a power supply via a first circuit breaker;
The output side is connected to the electric vehicle drive motor, and the DC power is converted to variable voltage variable frequency AC power to supply the variable voltage variable frequency AC power to the electric vehicle drive motor, respectively. A plurality of variable voltage variable frequency power converters;
A second filter circuit respectively connected through the circuit breaker, an input side is connected to the second filter circuit, and an output side is connected to the electric vehicle auxiliary circuit, and the DC power is converted to AC power at a constant voltage and constant frequency. A constant-voltage / constant-frequency power converter for converting and supplying the constant-voltage / constant-frequency AC power to the electric vehicle auxiliary circuit; and a constant for controlling the constant-voltage / constant-frequency power converter or the constant-voltage / constant-frequency power converter. When the voltage constant frequency control unit fails, the second circuit breaker and the second
Between the first circuit breaker and the predetermined one of the plurality of first filter circuits, and the second circuit breaker and the predetermined one of the plurality of first filter circuits are opened.
First switch means for connecting between the two filter circuits, and second switch means for connecting the output side of the variable voltage variable frequency power converter connected to the predetermined filter circuit to the electric vehicle auxiliary circuit. Electric vehicle control device having 5. The electric vehicle control device according to claim 4,
When the constant voltage / constant frequency power converter or the constant voltage / constant frequency control unit that controls the constant voltage / constant frequency power converter fails, the variable voltage / variable frequency power converter connected to the predetermined one filter circuit. The output side of the electric vehicle is separated from the electric vehicle drive motor, the output side of the constant voltage / constant frequency power converter is separated from the electric vehicle auxiliary circuit, and the variable voltage variable frequency connected to the predetermined one filter circuit. An output side of a power converter is connected to the electric vehicle auxiliary circuit, and the variable voltage variable frequency power converter connected to the predetermined one filter circuit converts the DC power to AC power having a constant voltage and a constant frequency. Electric vehicle control device having a control unit that performs control as described above. 6. The electric vehicle control device according to claim 4,
The first switch means includes a first switch provided between the first circuit breaker and the predetermined one filter circuit, and a first switch provided between the second circuit breaker and the second filter circuit. An electric vehicle control device comprising: a second switch provided therebetween; and a connection switch that connects between the second circuit breaker and the predetermined one filter circuit. 7. A plurality of main power converters for converting DC power into first AC power and supplying the first AC power to a plurality of electric vehicle drive motors, respectively, and converting the DC power to a second AC power. An auxiliary power converter that converts the power into AC power and supplies the second AC power to the electric vehicle auxiliary circuit, and a predetermined one of the plurality of main power converters when the auxiliary power converter is abnormal. Disconnect the output side of the electric vehicle drive motor from the output side of the auxiliary power converter, and disconnect the output side of the auxiliary power converter from the electric vehicle auxiliary circuit, and connect the output side of the predetermined one main power converter to the electric vehicle auxiliary circuit. A control unit for connecting and disconnecting the disconnected electric vehicle drive motor in parallel with another electric vehicle drive motor.