JP2878725B2 - Electric car control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a main power converter that converts DC power into AC power and supplies the AC power to an electric vehicle drive motor, and converts DC power into AC power. And an auxiliary power converter that supplies the electric power to the electric vehicle auxiliary circuit.

(Prior Art) An electric vehicle drive motor is driven by supplying AC power converted by a main power converter to drive an electric blower for cooling a control circuit of the main power converter, a resistor, and the like. The electric vehicle auxiliary circuit such as the above circuit is supplied with electric power from the auxiliary power converter.

As the main power converter, a variable voltage variable frequency (hereinafter, referred to as
VVVF. ) An inverter is used, and a constant voltage and constant frequency (CVCF) inverter is often used as the auxiliary power converter.

This is because large-capacity self-extinguishing semiconductor devices such as GTO thyristors have been put into practical use, and inverters that do not have contacts or circuit components and are easy to maintain can be realized in a practical size for use in vehicles. It depends.

(Problems to be Solved by the Invention) However, in the above-described electric vehicle control device, if the auxiliary power converter fails, power is not supplied to the electric vehicle auxiliary circuit, and not only the electric blower for cooling but also the main power conversion However, there is a problem that the system goes down without operating the control circuit of the vessel.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, 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.

[Configuration of the invention]

(Means for Solving the Problems) To achieve the above object, the present invention provides a plurality of main power converters for converting DC power into AC power and supplying the AC power to a plurality of electric vehicle drive motors, respectively. And an auxiliary power converter that converts DC power to AC power and supplies the AC power to the electric vehicle auxiliary circuit, and when the auxiliary power converter is abnormal, some of the plurality of main power converters Disconnect the AC side from the electric car drive motor,
The AC side of the auxiliary power converter is separated from the electric vehicle auxiliary circuit, and control is performed so that a part of the AC side of the plurality of main power converters is connected to the electric vehicle auxiliary circuit to supply power. An electric vehicle control device comprising: a main power converter that converts DC power into AC power of a variable voltage and variable frequency to supply power to an electric vehicle drive motor; and An auxiliary power converter that converts to AC power and supplies power to the electric vehicle auxiliary circuit at normal times, and disconnects the output side of the main power converter from the electric vehicle drive motor side when the auxiliary power converter is abnormal. An electric vehicle control device including control means for switching to the electric vehicle auxiliary circuit side and controlling so as to supply constant-voltage / constant-frequency AC power; and Car drive A main power converter that supplies power to the electric motor, an auxiliary power converter that converts DC power to AC power of a constant voltage and a constant frequency and supplies power to the electric vehicle auxiliary circuit during normal times, and an abnormality of the auxiliary power converter. An electric vehicle control device comprising control means for separating the electric vehicle drive motor from a part of the main power converter to perform constant voltage / constant frequency control and to supply the electric vehicle to the electric vehicle auxiliary circuit. To provide.

(Operation) With the configuration described above, when the auxiliary power converter fails, power can be supplied from the main power converter to the electric vehicle auxiliary circuit, so that even if the auxiliary power converter fails, the system can be prevented from going down. it can.

(Example) An example 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 showing one embodiment of the present invention.

A filter reactor 3 is connected to the pantograph 1 via a circuit breaker 2, a positive inlet end of a main power converter 5 is connected, and a negative input end thereof is grounded through wheels. In the present embodiment, the main power converter 5 includes a plurality of main power converters, and as the plurality of main power converters, VVVF power converters (hereinafter, referred to as VVVF inverters) 5a to 5d are used. ing. A filter capacitor 4 is connected between the positive and negative input terminals of the main power converter 5, and an electric vehicle drive motor (hereinafter, referred to as a main motor) 6 is connected to an output terminal. In this embodiment, the main motor 6 is also VVVF
It comprises four main motors 6a to 6d corresponding to the inverters 5a to 5d. Note that these VVVF inverters 5a to 5d
Among them, in the present embodiment, the control unit 7 controls the VVVF inverter 5d such that the VVVF inverter 5d can also be driven 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 so as to convert DC power into VVVF AC power. The VVVF controller 7b generates a VVVF controller 7b, and the CVCF controller 7c generates a drive signal for operating a switching element so as to convert DC power into CVCF AC power, and further controls changeover switches 81 to 83 described later.

Further, a positive input terminal of a CVCF power converter (hereinafter, referred to as a CVCF inverter) 9 in this embodiment is connected to the pantograph 1 via a circuit breaker 21 and a filter reactor 31 as an auxiliary power converter. The negative input is grounded through wheels. In addition, the positive of CVCF inverter 9,
A filter capacitor 41 is connected between the negative input terminals, and a primary side of the transformer 11 is connected to an output terminal via a waveform filter circuit 10. The secondary side of the transformer 11 is connected to a control circuit of the VVVF inverters 5a to 5d, and a three-phase auxiliary circuit (hereinafter referred to as an electric vehicle auxiliary circuit) for driving an electric blower for cooling resistors and the like. ing.

Further, the common unit 7a, the VVVF control unit 7b, and the CVCF control unit 7c
Switch 81, VVVF inverter 5d and main motor
6d, a changeover switch 82 is provided between the CVCF inverter 9 and the waveform filter circuit 10, and these changeover switches 81 to 83 are controlled by the control unit 7 and operate in conjunction therewith.

The operation of the present embodiment configured as described above will be described.

Normally, the control unit 7 keeps the changeover switches 81 to 83 on the x terminal side. Accordingly, the VVVF 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 AC power to the main motors 6a to 6d. The CVCF inverter 9 converts the DC power collected by the pantograph 1 into CVCF AC power and supplies the AC power to the electric vehicle auxiliary circuit.

Here, the filter reactors 3 and 31 and the filter capacitors 4 and 41 reduce the ripple of the overhead wire voltage and also reduce the high-frequency current generated from the VVVF inverters 5a to 5d and the CVCF inverter 9. The waveform filter circuit 10 shapes the waveform output from the CVCF inverter 9 into a sine wave and supplies the sine wave to the transformer 11.

Next, a case where the CVCF inverter 9 fails will be described. If the output of the CVCF inverter 9 becomes zero due to a failure of the CVCF inverter 9 itself or a CVCF control unit (not shown) that controls the CVCF inverter 9, the secondary voltage of the transformer 11 also becomes zero. As described above, when the CVCF inverter 9 has failed, the control unit 7 detects this, and
81 to 83 are switched and connected to the opposite side (y terminal side) from the illustrated state (x terminal side). Then, the CVCF inverter 9 is separated from the electric vehicle auxiliary circuit by the changeover switch 83, and instead, the output terminal of the VVVF inverter 5d is separated from the main motor 6d by the changeover switch 82, and the output terminal of the VVVF inverter 5d has a waveform. Connected to filter circuit 10. Further, the 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 generates a drive signal for operating the switching element configuring the VVVF inverter 5d so as to convert the DC power into the CVCF AC power, and outputs the drive signal to the common unit 7a. Drive based on the signal. Therefore, some VVVF inverters of the main power converter 5
Since 5d operates as a CVCF inverter, the CVCF AC power output from the VVVF inverter 5d is
0, supplied to the electric vehicle auxiliary circuit via the transformer 11.

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 is constantly established, the vehicle operates as an electric vehicle Can be continued.

In the above embodiment, a system for inputting DC power from an overhead line is targeted. However, the present invention is not limited to this, and is applicable to a system for inputting AC power from an overhead line.

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

Therefore, also in the present embodiment, when the CVCF inverter 9 fails, the power supply to the electric vehicle auxiliary circuit is established by the VVVF inverter 5d, and the system down of the electric vehicle can be avoided.

〔The invention's effect〕

As is apparent from the above description, auxiliary power conversion in a vehicle power conversion device including a main power converter for supplying AC power to an electric vehicle drive motor and an auxiliary power converter for supplying AC power to an electric vehicle auxiliary circuit. Since the main power converter is used as the auxiliary power converter when the device fails, there is an effect that the system down due to the failure of the auxiliary power converter can be avoided.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an electric vehicle control device showing one embodiment of the present invention, and FIG. 2 is a configuration diagram of an electric vehicle control device showing another embodiment. 1 ... pantograph, 2,21 ... breaker, 3,31 ... filter reactor, 4,41 ... filter capacitor, 5a-5d ...
... VVVF inverter, 6a-6d ... Main motor, 7 ... Control unit, 81-83 ... Changeover switch, 9 ... CVCF inverter,
10: Waveform filter circuit, 11: Transformer, 12: Main transformer, 13: Rectifier circuit.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B60L 1/00-3/18 B60L 9/00-11/18 H02M 7/48

Claims (3)

(57) [Claims] 1. A plurality of main power converters for converting DC power into AC power and supplying the AC power to a plurality of electric vehicle drive motors, respectively; An auxiliary power converter that supplies the AC power to a circuit; and when the auxiliary power converter is abnormal, a part of the AC side of the plurality of main power converters is disconnected from the electric vehicle drive motor, and the auxiliary power converter Control means for disconnecting the AC side of the converter from the electric vehicle auxiliary circuit and connecting the AC side of the plurality of main power converters to the electric vehicle auxiliary circuit so as to supply power. And an electric car control device with 2. A main power converter for converting DC power into AC power having a variable voltage and a variable frequency to supply the AC power to an electric vehicle drive motor; and converting DC power into AC power having a constant voltage and a constant frequency. An auxiliary power converter for supplying the AC power to the electric vehicle auxiliary circuit in a normal state; and when the auxiliary power converter is abnormal, the output side of the main power converter is disconnected from the electric vehicle drive motor to disconnect the electric vehicle auxiliary. An electric vehicle control device comprising: a control unit that switches to a circuit side and controls so as to supply AC power having a constant voltage and a constant frequency. 3. A main power converter for converting DC power into AC power having a variable voltage and variable frequency to supply the AC power to an electric vehicle drive motor, and converting DC power into AC power having a constant voltage and constant frequency. An auxiliary power converter for supplying the AC power to the electric vehicle auxiliary circuit in a normal state; and when the auxiliary power converter is abnormal, a part of the main power converter is separated from the electric vehicle drive motor to control a constant voltage and a constant frequency. And a control means for controlling the electric vehicle to supply the electric vehicle auxiliary circuit.