JPS6325974B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power regeneration substation control system for electric railways using a DC feeding system.

In the method of converting AC power into DC power using a static forward converter such as a thyristor converter and supplying DC power, a reverse converter such as a thyristor inverter is used to regenerate power from the DC electric vehicle side. Figure 1 shows the main configuration of this type of power regeneration substation. A three-phase AC power source 1 is passed through a transformer 2 as an AC power source for a thyristor converter 3, and the converter 3 takes out DC power controlled to a set voltage and supplies power to an electric car 6 through a feeder line 4 or a trolley wire 5. On the other hand, to regenerate power from the electric vehicle 6, it is converted into AC power by a DC reactor 7 and a thyristor inverter 8, and the power is regenerated to the power source 1 side through a transformer 9.

In the regenerative substation configuration shown in Figure 1, the conventional control method controls converter 3 and inverter 8 separately, and sets the set voltage of inverter 8 slightly higher than the output set voltage of converter 3. ,
Depending on the operating state of the electric vehicle group, during power running, the converter 3 performs AVR operation and reduces the control advance angle γ of the inverter 8, and conversely, during regeneration, the control advance angle γ of the converter 3 is reduced and the inverter 8
It was AVR controlled. Therefore, regardless of the magnitude of the feeding current, the inverter and converter are always controlled to start, and a circulating current flows between the inverter 8 and the converter 3. There was power loss due to

The present invention provides a gate or disconnection circuit in either the forward conversion device or the inverse conversion device, and the gate of the conversion device having the gate or disconnection circuit is disconnected depending on the operating state of power running and regeneration. By doing so, it is an object of the present invention to provide a control method that reduces circulating current loss between both converters.

FIG. 2 shows an embodiment of the present invention, in which the thyristor converter 3 is provided with a gate and a disconnection circuit. The gate control device of the converter 3 compares the set value of the voltage setting device 10 with the detected voltage value V _D , extracts a voltage control signal from the voltage regulator 11 according to the deviation between the two, and subjects this voltage control signal to phase control. From the gate control circuit 12 as input to the converter 3
In addition to the voltage control circuit that obtains the gate output of each thyristor, there is also a comparator 14 (as shown by the dotted line, gate control circuit 1 by inverting the output _of
A gate cut-off control circuit is provided to cut off the output of the second gate. Here, the setting value of the voltage setting device 13 is equivalently set higher than the voltage (=V _D ) set by the setting device 10. For voltages higher than this set value, the output of comparator 14 is inverted and converter 3
control the gate input. This gate input cut-off control is shown in terms of a circuit using relay contacts, but it can also be configured as output control within the gate control circuit 12.

The gate control device of the thyristor inverter 8 is
Setting device 1 to set higher than the setting value of setting device 10
5 and the aforementioned detection voltage V _D , and take out a voltage control signal from the voltage regulator 16 according to this deviation,
A voltage control circuit is provided which controls the gate output phase of the gate control circuit 17 using this signal and applies this gate output to the thyristor element.

In this way, by providing the control device of the thyristor converter with a gate cut-off control circuit, the gate of the converter 3 is cut off during power regeneration, and the regenerated power is regenerated to the power supply 1 side by the inverter 8. Therefore, circulating current loss between converter 3 and inverter 8, loss in the CR absorber within converter 3, and gate current loss flowing through converter 3 can be eliminated, and regeneration efficiency can be improved. In this case, there is no gate failure of the inverter 8, resulting in stable regenerative operation.

In Fig. 2, a case is shown in which the converter 3 side is provided with a gate cut-off control circuit;
As shown in the figure, a gate shedding control circuit is provided on the inverter 8 side, and power loss in the inverter 8 can be eliminated by cutting off the gate of the inverter 8 during power running. 13A and 14A are setting device 1
3. It corresponds to the comparator 14 and constitutes a gate sheathing control circuit, which controls the reduction of the feeding voltage and the continuation of the current by the current transformer 18 and the current intermittent detection circuit 19. Obtain gate cutoff control output when detected.

As described above, in the present invention, since one of the forward converter and the inverse converter is provided with a gate cut-off control circuit, it is possible to reduce circulating current loss between the converters.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of essential parts of a regenerative substation, FIG. 2 is a block diagram of a control device showing one embodiment of the present invention, and FIG. 3 is a diagram showing another embodiment of the present invention. 3... Thyristor converter, 8... Thyristor inverter, 11, 16... Voltage regulator, 1
2, 17...Gate control circuit, 13, 13A...
Setting device, 14, 14A... Comparator, 19... Current continuation detection circuit.

Claims (1)

[Claims] 1. In a DC feeding type power regeneration substation using a thyristor converter and a thyristor inverter, a gate cut-off control circuit is provided in either the converter or the inverter, and the converter is controlled depending on the operating state of power running or regenerative operation. , a power regeneration substation control method characterized by gating and disconnecting one side of the inverter.