JPS59132778A - Ac/dc converter - Google Patents

Abstract

PURPOSE:To reduce the installing area of a component devices by arranging DC reactors at both sides of positive and negative polarity lines, thereby shortening the length of a 3-wire simultaneous gas insulated bus itself. CONSTITUTION:High and low voltage thyristor valves 3a, 3b are superposed, and high and low voltage converting transformers 2a, 2b are arranged at both sides of the valves 3a, 3b. Positive, negative polarity lines 21, 22 and a neutral line 23 are led out in a direction perpendicular to the opposed direction of the transformers 2a, 2b from thyristor valve group, and DC reactors 4a, 4b are disposed at both sides of the lines 21, 22. With the above-described structure, the length of the 3-wire simultaneous gas insulated bus 34 itself can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an AC/DC converter station that constitutes an ultra-high voltage DC power transmission system, and particularly relates to the arrangement of each device in the AC/DC converter station.

[Technical Background of the Invention] A conventional AC/DC converter station has an equipment arrangement based on air insulation. However, in recent years, there has been a trend toward higher power in power systems, and when transmitting large amounts of power to remote locations, the transmission voltage has increased even in the case of direct current as well as alternating current, and has already increased to ±250 kV.
A class AC/DC converter station has been constructed. For 10100O0 class power transmission, Lll-IV (ultra high voltage) class is essential for AC systems, but LJHV class requires an enormous amount of site space from the perspective of securing the line width space for transmission towers. Therefore, even with the same 10100O0, in the case of DC power transmission, ±500KV class is enough to cover the power transmission capacity, so DC ±50KV class can handle insulation equivalent to AC 500KV class.
0KV power transmission becomes advantageous.

-2- However, as mentioned above, conventional conversion stations used air insulation up to ±250KV class, so by extending that technology,
If a 0KV class conversion station were designed, the site for the conversion station would be enormous.

Furthermore, when a DC voltage is applied to an insulator, it becomes electrically charged, and its withstand voltage performance tends to decrease due to the adhesion of airborne impurities. Since it depends on the leakage distance, it generally requires a longer bushing compared to AC voltage.

On the other hand, DC power transmission generally uses a neutral pole wire (ground pole wire) in addition to the positive and negative pole busbars, and this is used to carry unbalanced current between the positive and negative poles, and to carry current when one pole is stopped. Used on the return trip. The components used in this neutral horizontal line circuit also have the same problems as the positive and negative pole components. Therefore, from the perspective of reducing site area, it is natural to consider adopting gas insulation methods for switchgear. However, even if only the installation space for the switchgear is reduced, if you look at the conversion station as a whole,
It won't be that much of a reduction.

-3- Therefore, it is desirable to construct a gas-insulated AC/DC converter station that reduces the site area by combining gas-insulated equipment, which has been used in many fields in recent years, with DC power transmission technology. Also, noting that the DC side of an AC/DC converter station is composed of a positive pole line, a negative pole line, and a neutral pole line, it is desirable to construct a gas insulated AC/DC converter station by using the above three wires as a gas-insulated conduit busbar. .

An example of a gas-insulated AC/DC converter station to which such technology is applied is shown in FIGS. 1 to 3.

First, FIG. 1 is a single line diagram of the same, in which a high-voltage stage conversion transformer 2a and a low-voltage stage conversion transformer 2b are connected to the AC side electric line 1, and a high-voltage stage thyristor valve 3a and a low-voltage stage conversion transformer 2b are connected, respectively. It is connected to the low pressure stage thyristor valve 3b.

The high-pressure stage thyristor valve 3a and the low-pressure stage thyristor valve 3b are connected in series as shown in Fig. 1, with the high-pressure side having a positive electrode line and the low-pressure side having a negative electrode line, and the above-mentioned high-pressure and low-pressure thyristor valves 3a and 3b connected together. The section is connected as a neutral pole line to an electric circuit outside the AC/DC converter station -4-. DC reactors 4a and 4b are connected to the positive and negative lines, and lightning arresters 5a and 4b are connected to each part on the DC side.
5b, 6a, 6b1 voltage transformer 7a.

7h, 7c, DC filter 8, 81), current transformer 9a
, 9b, 90) Disconnectors 10a, 10b, 10C1 lightning arresters 11a, 11b, 11c and DC bushings 12, 12b, 12c are connected.

The arrangement of each equipment in the AC/DC converter station shown in Figure 1 is as follows.
As shown in the figure, a high-pressure stage conversion transformer 2a and a high-pressure stage thyristor valve 3a, and a low-pressure stage conversion transformer 2b and a low-pressure stage thyristor valve 3b are combined, respectively, and these combinations are parallel and the thyristor valve are arranged so that they face the same direction. From the side opposite to the conversion transformers 2a, 2b of each thyristor valve 3a, 3b, a positive polarity wire 21
A negative polarity wire 22 is drawn out, and a neutral wire 23 is drawn out from the neutral point of the high pressure stage thyristor valve 3a and the low pressure stage thyristor valve 3b.

Among these, the positive polarity line 21 and the negative polarity line 22 are provided with DC reactors 4a, 4b and lightning arresters 5a, 5b.

-5- 6a and 6b are connected respectively. Also, positive polarity line 2
1. The negative polarity wire 22 and the neutral wire 23 have a cross section as shown in FIG. 3 extending parallel to the direction in which they are drawn out.
It is connected to the gas insulated pipe bus 24 all at once, and this pipe bus 2
Voltage transformers 7a, 7b and DC filters Qa, 8 are installed on the left and right sides of 4, avoiding the DC reactors 4a, 4b.
b are arranged and connected. The AC/DC converter station is connected to an external DC electric line through a positive polarity wire 25, a negative polarity wire 26, and a neutral wire 27 drawn out from the terminal end of the three-wire gas-insulated conduit bus 24.

[Problems in the Background Art] However, in a gas-insulated AC/DC conversion station having such a configuration, the 3-wire collective gas-insulated conduit bus 24 connects the conversion transformers 2a, 2b and the thyristor valves 3a, 3b. Since it is extended in the arrangement direction, the installation area of the component equipment becomes larger, and the gas insulated bus bar on the DC side becomes longer by the length of the DC reactors 4a and 4b, resulting in an increase in manufacturing cost. Ta. In particular, recently, as AC/DC converter stations are increasingly being constructed in mountainous areas due to a lack of land in the suburbs of cities, it has become difficult to secure long, flat sites, which has hindered the construction of AC/DC converter stations. Ta.

[Object of the Invention] The present invention has been made in view of the above points, and its purpose is to provide an AC/DC converter station in which the installation area of component equipment is reduced and the length of the gas-insulated bus bar on the DC side is shortened. There is a particular thing.

[Summary of the Invention] The AC/DC converter station of the present invention has a high-pressure stage thyristor valve and a low-pressure stage thyristor valve arranged one on top of the other, and provides direct current to both sides of a positive polarity line and a negative polarity line derived from the DC side of the thyristor valve. By arranging the reactor and connecting the positive polarity wire, negative polarity wire, and neutral wire to a 3-wire collective gas-insulated conduit busbar arranged in the same direction as the thyristor valve arrangement direction, the component equipment of the AC/DC converter station can be Reduce the installation area of
This is a shortened 3-wire gas insulated pipe bus.

-7- [Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIGS. 4 and 5. - Note that the same parts as in the conventional type shown in FIGS. 1 to 3 are indicated by the same reference numerals.

In FIG. 4, a high-pressure stage thyristor valve 3a and a low-pressure stage thyristor valve 3b are arranged one on top of the other, and a high-pressure stage conversion transformer 2a and a low-pressure stage conversion transformer 2b are arranged on both sides of the thyristor valves 3a and 3b. has been done. Further, from the thyristor valve group, a positive polarity line 21, a negative polarity line 22, and a neutral line 23 are led out in a direction substantially orthogonal to the opposing direction of the high voltage stage conversion transformer 2a and the low voltage stage conversion transformer 2b, DC reactors 4a and 4b are arranged on both sides of the positive polarity line 21 and the negative polarity line 22. Furthermore, positive polarity line 2
1, the negative polarity wire 22 and the neutral wire 23 are connected to a three-wire gas-insulated conduit bus 34. This three-wire collective gas insulated pipeline busbar 34 has a positive polarity wire 25 drawn out from its terminal end.
, a negative polarity line 26, and a neutral line 27, and are connected to a DC electric line outside the AC/DC converter station.

-8- In the AC/DC converter station of the present invention configured in this way, the high and low pressure stage thyristor valves 3a and 3b are arranged in layers.
By arranging the high/low voltage stage conversion transformers 2a and 2b on both sides of the will be significantly reduced. In addition, a DC reactor 4a,
4b on both sides of the positive polarity wire 21 and the negative polarity wire 22, the voltage transformers 7a, 7b and the DC filter 8
a and 8b can be placed as close as possible to the confluence of the positive polarity wire 21, negative polarity wire 22, and neutral wire 23, so 3.
The length of the gas-insulated bus bar 34 itself can be shortened, and manufacturing costs can be reduced.

In this way, the installation area of the components of the AC/DC converter station is also reduced, making it possible to construct the AC/DC converter station even in cases where it is difficult to secure a large site due to land restrictions.

It should be noted that the present invention is not limited to the above-described embodiment, and as shown in FIG. The transformer 2a and the low-voltage stage conversion transformer 2b may be arranged substantially at right angles, and various arrangement examples can be considered in consideration of conditions such as the shape of the site where the AC/DC converter station is installed and the direction of power reception.

[Effects of the Invention] As described above, according to the present invention, it is possible to provide an AC/DC converter station in which the installation area of component equipment is reduced and the length of the gas insulated bus bar on the DC side is shortened.

[Brief explanation of drawings]

Figure 1 is a single-line diagram of an AC/DC conversion station, Figure 2 is a plan view showing a general equipment arrangement based on the single-line diagram of Figure 1,
3 is a sectional view of a 3-line gas-insulated pipeline busbar, FIG. 4 is a plan view showing an embodiment of the AC/DC converter station of the present invention, and FIG. 5 is a side view of the embodiment of FIG. FIG. 6 is a plan view showing a modification of the AC/DC conversion station of the present invention. DESCRIPTION OF SYMBOLS 1... AC side electrical circuit, 2a... Transformer for high voltage stage conversion, 2b... Transformer for low voltage stage conversion, 3a... High voltage stage thyristor valve, 3b... Low pressure stage thyristor valve, 4a , 4b...DC reactor, 58.5-1
0-b, 6a, 6b... Lightning arrester, 7a, 7b, 7
0-...Voltage transformer, 8a, 8b...DC filter,
9a. 9b, 9C...Voltage transformer, 10a, 10b, I
Qc...Disconnector, 11 a, 1 l b, 1
1 c...Surge arrester, 12a, 12b, 12c...
DC bushing, 21... Positive polarity wire, 22... Negative polarity wire, 23... Neutral wire, 24... 3-wire collective gas insulated conduit bus bar, 25... Positive polarity line, 26...・・Negative polarity line,
27...Neutral line, 34...3-wire collective gas insulated pipe busbar. 7317 Representative Patent Attorney Norichika Kensuke (1 idiot) -11-

Claims (3)

[Claims] (1) In an AC/DC converter station where a high-pressure thyristor valve and a low-pressure thyristor valve are connected in series, the high-pressure thyristor valve and the low-pressure thyristor valve are arranged one on top of the other, and the positive electrode is derived from the DC side of these thyristor valves. DC reactors are arranged on both sides of the positive polarity wire and the negative polarity wire, and the positive polarity wire, negative polarity wire, and neutral wire are arranged in the same direction as the arrangement direction of the thyristor valves. An AC/DC converter station characterized by being connected. (2) Claim 1 in which a high voltage stage conversion transformer and a low voltage stage conversion transformer are arranged on both sides of the thyristor valve.
AC/DC converter station mentioned in section. (3) The AC/DC converter station according to claim 1, wherein the high voltage stage conversion transformer and the low voltage stage conversion transformer are arranged in directions substantially orthogonal to each other with respect to the thyristor valve.