JPH0750962B2 - AC electric vehicle control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an AC electric vehicle that operates by receiving AC power from an overhead wire via a panda graph and receiving power conversion means when passing through a non-voltage section (section) of the overhead wire. The present invention relates to a control device capable of automatically stopping and resuming the output control of the above.

[Conventional technology]

In an AC electric vehicle that operates by receiving AC power from an overhead wire via a Pandagraph, there is a no-voltage section (section) in the switching section of the overhead wire that feeds power from one substation and the next substation, and the power supply voltage is Generally, the phases are different from each other, so the driver operates the master controller in front of the section to stop the output control of the received power conversion means and restarts it after passing through the section to generate excessive current due to the phase difference of the power supply voltage. It was designed to prevent damage to the equipment that accompanies this.

[Problems to be solved by the invention]

The above structure has a drawback in that the driver may inadvertently perform an operation to damage the device.

In order to eliminate the above-mentioned drawbacks, the present invention provides a control device for an AC electric vehicle capable of automatically stopping and restarting the output control of the received power conversion means when a section of an overhead line is passed. To aim.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention includes a transformer 3 that receives AC power from an overhead wire 1 via a panda graph 2.
Power conversion means 4 for converting the AC output of the transformer 3 into DC power by PWM control, and the PWM voltage waveform generated on the primary side of the transformer 3 when passing through the section of the overhead line 1 to detect no voltage. The non-voltage detecting means 5, the section passage detecting means 6 for detecting a section passage by continuing the output signal of the non-voltage detecting means 5 for a certain period of time, and the section converting signal of the non-voltage detecting means 5 for the power converting means The output voltage control is stopped and the control means 7 is automatically restarted after passing through the section.

[Action]

When the electric vehicle enters the section, the no-voltage detection means 5 detects the no-voltage, the output control of the power conversion means 4 is automatically stopped, and this is restarted by the output signal of the section passage detection means 6 after passing the section. Therefore, it is possible to prevent the generation of an excessive current when passing through the section due to the driver's erroneous operation and the resulting damage to the equipment.

〔Example〕

FIG. 1 shows an embodiment of the present invention, in which the AC output of the smoothing reactor 8 and the transformer 3 is connected to the DC power on the secondary side of the transformer 3 which receives the AC power from the overhead wire 1 via the panda graph 2. A load device 9 such as a DC motor is electrically connected via a power converting means 4 for converting into a load. The power conversion means 4 comprises a GTO (gate turn-off) thyristor 41, a diode 42, etc., and a smoothing capacitor 10 and a DC voltage detector 11 are connected in parallel on the output side. The output voltage of the power conversion means 4 is controlled by PWM modulating the gate signal of the GTO thyristor 41 by the control means 7 provided with the DC voltage setting device 12. On the primary side of the transformer 3, an AC voltage detector 13 is used to detect a non-voltage detecting means 5 and the passage of a section (a non-voltage section) of the overhead wire 1 by continuing the output signal of the non-voltage detecting means 5 for a certain period of time. The section passing detection means 6 is provided to detect the PWM-modulated voltage generated on the primary side of the transformer 3 when the electric vehicle enters the section.

The power conversion means 4 is an AC voltage detector 13 and an AC current detector provided on the secondary side of the transformer 3 while the electric vehicle is running in the power supply section.
14, the control means 7 calculates the magnitude and phase of the input voltage so that the DC output voltage matches the set value of the DC voltage setter 12 from the detected outputs of the DC voltage detector 11 and the DC load current detector 15. A gate signal is created and PWM-modulated to control the output in addition to the gate of the GTO thyristor 41, and the gate signal is updated every half cycle in synchronization with the zero crossing of the AC voltage detected by the AC voltage detector 13. Has become. The no-voltage detecting means 5 and the section passage detecting means 6 do not generate an output signal while the electric vehicle is traveling in the power feeding section.

When the electric car enters the section, the overhead line 1 becomes unvoltage, but a gate signal is output and power is supplied to the transformer 3 from the power conversion means 4 side. As shown in FIG. The PWM modulated voltage waveform is detected. This voltage is a value obtained by converting the DC output voltage by the turns ratio of the primary and secondary windings of the transformer 3, and since the DC output voltage is generally set to be larger than the maximum value of the secondary voltage of the transformer 3, power is supplied from the overhead line 1. It becomes larger than the maximum voltage of time. The no-voltage detecting means 5 is a PWM modulation voltage detected by the AC voltage detector 13 and the overhead wire 1
The voltage difference from the power supply voltage is detected, a non-voltage detection signal is output, and the timer is activated by this output signal. The section passage detecting means 6 determines that the electric vehicle has passed the section when the no-voltage continues for a certain time due to the operation of the timer, and the output signal thereof is input to the control means 7. The operating time of the timer is set shorter than the section passing time. The control means 7 receives the output signal of the section passage detection means 6 and turns off the gate signal of the GTO thyristor 41 to automatically stop the output control of the power conversion means 4,
When the electric car passes through the section and enters the power supply section, the gate signal is turned on and the output control is restarted when the timer stops operating.

〔The invention's effect〕

According to the present invention, in the control device for the AC electric vehicle, when the electric vehicle enters the section (no-voltage section) of the overhead line, the no-voltage is detected by detecting the PWM modulation voltage generated on the primary side of the transformer that receives power from the overhead line. The output control of the power conversion means connected to the secondary side is automatically stopped after detection and restarted after passing through the section. The effect of preventing damage to the device can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention, and FIG.
It is explanatory drawing of the generated voltage of the figure. 1 ... overhead line, 2 ... panda graph, 3 ... transformer, 4 ...
... power conversion means, 5 ... no-voltage detection means, 6 ... section passage detection means, 7 ... control means.

Claims (1)

[Claims] 1. A transformer, which receives AC power from an overhead wire via a Pandagraph, and power conversion means, which converts the AC output of the transformer into DC power, wherein the output voltage of the power exchange means is controlled by PWM control. In the control device for the AC electric vehicle that
No-voltage detection means for detecting no-voltage by detecting the PWM voltage waveform generated on the primary side of the transformer when passing through a no-voltage section (section) existing in the power supply switching section of the overhead line, and this no-voltage detection means Section passage detecting means for detecting a section passage by continuing the output signal for a certain time, and control means for stopping the output control of the power converting means by the section entry signal of the non-voltage detecting means and automatically restarting it after the section passage. And a control device for an AC electric vehicle.