JPS5810262B2 - Control device for electric railway power regeneration equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for controlling a power regeneration device for an electric railway.

In the conventional floating charging system, as shown in FIG. Utilizing the constant voltage characteristics, the magnitude and direction of the current are automatically controlled depending on the load, power running, regenerative operation, etc.

The relationship between voltage and current between the battery and the load in this floating charging method is as shown in FIG.

This characteristic indicates that when the overhead line voltage increases due to regenerative operation of the train, the battery charging current increases, and when the overhead line voltage decreases due to the electric train running, the battery discharging current increases. .

However, the main purpose of installing this type of device is to prevent the overhead line voltage from increasing significantly or from not regenerating at all when there is no other power running vehicle that consumes the regenerative power of the regenerative vehicle. That's true.

However, if a device with the characteristics shown in Figure 2 is connected to an electric railway, charging and discharging current will constantly flow even with slight voltage fluctuations in the overhead wires, so the power running cars will not be able to efficiently consume the energy of the regenerative cars. In addition, it is not possible to determine whether the voltage fluctuations in the overhead wires are due to vehicle power running, regenerative current, or fluctuations in the output of the substation supplying power, so it is impossible to determine whether the voltage fluctuations in the overhead wires are due to fluctuations in the output of the substation that supplies the power. In this case, there is a drawback that charging is performed in accordance with the increase in the battery even though there is no need for charging.

Furthermore, changing the voltage of the regenerative device in proportion to the output voltage of the substation is no longer effective when there are two or more power stations.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and by providing a range where neither charging nor discharging occurs, it is possible to perform only regeneration and power running of the train, regardless of voltage fluctuations at the substation. The object of the present invention is to provide a control device that performs charging and discharging according to the conditions.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 3, the configuration in which current is supplied from a substation transformer 1 to a train 4 via a rectifier 2 and an overhead wire 3, and a battery 5 is connected to the overhead wire 3 is the same as that in FIG. 1, but The one shown in FIG. 3 differs from the one shown in FIG. 1 in that a Zener diode 6 is connected between the overhead wire 3 and the battery 5.

The Zener diode 6 generally has a certain degree of difference between the forward conduction voltage (1) and the higher Zener voltage (2).

When the Zener diode 6 having such properties is inserted between the overhead wire 3 and the battery 5 as shown in FIG. 3, the voltage difference between the voltage of the battery 5 and the overhead wire 3 becomes the forward conduction voltage The battery 5 is discharged when the voltage is below, and when it becomes higher than the Zener voltage ■2, the panteri 5 is charged, but when it is within the range between these two voltages ■1 and v2, it is charged. Control is performed so that neither discharge nor discharging occurs.

Figure 4 shows the relationship between overhead line voltage and charging/discharging current.

Therefore, if conditions are set such that the range between voltages (1) and (2) matches the variation range of the output voltage of the substation, charging and discharging of the battery 5 will not occur due to variations in the output voltage of the substation. This means that operations that can be performed reliably during regeneration and power running of the train can be obtained.

Although the above embodiment shows a case where a battery is used as the regeneration device, an inverter device or a generator with a flywheel may also be used, and any device that can change the charging and discharging regulation may also be used. It's okay.

Further, the Zener diode 6 generally only needs to have a custom-made Zener, and for example, a semiconductor current control device may be used.

As described above, according to the present invention, when the overhead line voltage is within a predetermined range, no power is regenerated or discharged, and as a result, fluctuations in the overhead line voltage are freely allowed within a certain range. Voltage fluctuations must be controlled when the voltage fluctuates beyond this range. For example, if a regenerative vehicle and a power running vehicle exist at the same time in a substation section, and the overhead line voltage fluctuates depending on the operating status of each. However, as long as the power running vehicle can absorb the energy of the regenerative vehicle, the regenerative device will not operate, allowing effective use of electric power.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing a conventional power regeneration device, Fig. 2 is a graph showing the relationship between overhead wire voltage and charging/discharging current in the same device, and Fig. 3 is a circuit diagram showing a conventional power regeneration device. FIG. 4 is a circuit diagram showing the power regeneration device, and is a graph showing the relationship between the overhead line voltage and charging/discharging current in the device. 1... substation transformer, 2... rectifier, 3... overhead wire, 4... train, 5...
...Battery, 6...Zener diode.

Claims (1)

[Claims] 1. A power regeneration device for electric railways is connected in parallel with a power source and a load, and furthermore, when the overhead line voltage is within a certain preset range, the power regeneration device is controlled so as not to input energy from the power regeneration device. , performing energy regeneration only when the overhead line voltage exceeds the upper limit of the range;
1. A control device for a power regeneration device for an electric railway, characterized in that a control device is provided for controlling energy to be released only when the overhead line voltage falls below the lower limit of the range.