SU469185A1 - A high-voltage direct current transformer substation with a few outgoing lines - Google Patents

Description

The invention relates to branched DC power transmissions containing converter stations with several DC power lines.

A distinctive feature of the proposed converter substation is the creation of conditions for the partial retention of power supply in the outgoing lines in case of accidental damage to the substation or to the line, for which the converters included in the substation are divided into two groups operating independently of each other , each connected by one pole to a common working grounding conductor. At the same time, the free poles of these groups form two poles of a substation (of different or identical polarity), and the transmission lines have two insulated wires from each other, “which are connected respectively to both poles of the substation.

FIG. 1 shows a schematic diagram of a converter station in the bipolar variant of power transmission; in fig. Figure 2 shows an embodiment of a direct current substation with several outgoing lines in unipolar design.

The converters included in the substation (see Fig. 1) are divided into two groups 1 (conventionally shown in the diagram), each in the form of a single transformer and valves connected via a bridge circuit. Depending on the voltage and power of the installation, these converters may consist of several transformers and several valve groups connected in series or in parallel, connected by bridge or other

pattern. Each group of transducers is connected by one pole to a common working earthing switch 2. The other poles of these groups form two poles of substation 3 of different or identical polarity. Outgoing lines of direct current transmission have two

insulated wire 4 (single or

split) that are attached to

both poles of the substation.

When performing all converters

The substations that make up the network, in a similar way, the entire DC network is two independent semi-chains of positive and negative polarity. Accidents occurring in any of

objects of a semi-chain can be eliminated by switches of direct current (if they are available) or disconnectors during short-term logging of the damaged semi-chain or, finally, by its complete redemption.

In all cases, the second semi-chain continues to operate at 50% throughput (due to the possibility of overloading, the throughput of a healthy circuit can be increased for this period) with the current flowing through the ground. The probability of simultaneous damage to both half-depot, both on the converter stations, where the equipment of the semi-chains operates independently of each other, and on the lines is very small.

In the unipolar version of the converter station (see Fig. 2), the DC network consists of two independent unipolar networks (the total operating current of both circuits flows through the working earthing switches), and all the above described advantages of the proposed multi-feeder connection circuit are maintained for it. substation.

The transformers included in the converters can operate separately on the AC side or be connected to common AC buses 5 with outgoing 6 current transfer lines. FIG. 2 shows a variant involving the connection to the transformers of the generators 7. In this case, schemes with the absence of buses and lines of non-alternating current alternating current are also possible.

Subject invention

A high voltage power transmission transformer substation with several outgoing lines with power converters divided on the DC side into several groups, characterized in that in order to partially maintain the power supply of outgoing lines in case of an emergency damage substations or lines that make up the substation, the converters are divided on the DC side into two groups working independently of each other, each connected to the working The grounding conductor in such a way that the free poles of these groups form two poles of the substation (of different or the same polarity), and the transmission lines have two insulated wires (single or split), which are connected respectively to both poles of the substation.

, L1I..I

//

r €) -SHG-0-g

I / -; h ---. I

-tw-; i- -r