JPH08266055A - Thyristor valve - Google Patents

Abstract

PURPOSE: To maintain the required earthquake resistance and the insulation property of a thyristor valve, and improve the manufacture property of an insulating stud and transportation property of a valve unit. CONSTITUTION: An insulating stud is divided into 8a and 8b, at such position that the flexural moment working on the insulating studs 8a and 8b becomes minimum so that the valve unit may be halved above and below while maintaining the material strength and the insulating property to a thyristor valve, and between them is a mechanical coupling 14 provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thyristor valve used for direct current power transmission, power system interconnection, or power transportation between different frequency power systems.

[0002]

2. Description of the Related Art FIG. 14 is a perspective view showing a conventional valve body. As shown in FIG. 15, the valve main body includes a plurality of thyristor elements 2, an anode reactor 3 which is a circuit component, a resistor 4, a capacitor 5, and the like, and a metal storage case 6
, A cooling water pipe 7 for water cooling is arranged to form a thyristor module (hereinafter referred to as a module) 1, which is suspended on an insulating support 8 and attached in a stepwise manner in a space formed by the frames 9a to 9e. Further, the valve units are electrically connected in series to form a valve unit, which is laminated in a plurality of stages.

A valve is represented by the symbol shown in FIG. 6, and an electrical functional unit called an arm is formed by the circuit configuration shown in FIG. 7 or FIG. 8, and 4 to 8 modules 1 are connected in series. It is common to connect them to form one arm and arrange them in units of 1 to 2 arms in each space formed by the frames 9a to 9e as shown in FIGS.

FIG. 11 shows an example of a pair of opposing frames and a module group arranged in a space formed by the frames, that is, module arrangement in the valve unit 10 and electrical connection.
Shown in This figure shows an example in which a module group is arranged in the space formed by the frame 9a and the second frame 9b in the lowermost valve unit 10 which constitutes the valve shown in FIG. 14, for example. One arm is configured by and is arranged between the frames. 4 modules A1
1 to A14 form a half of the first arm A1 with a certain distance from each other on the stage on the same horizontal plane, and are arranged above the first frame 9a.

Similarly, four modules A15 to A18 are formed on the stages on the same horizontal plane and are spaced apart from each other to form the remaining half of the first arm A1 and are arranged above the modules A11 to A14. are doing.

Further, the modules are electrically connected in series in the order of A11 to A18 with the connecting line 11, and the first and last modules A11 and A18 are also connected with the connecting line 11 first,
The valve unit 10 is connected to the second frames 9a and 9b.
Is composed.

While maintaining the same positional relationship as described above, the second to third frames 9b are arranged above the second frame 9b as shown in the block diagram of FIG.
The four arms A2 to A4 and the frames 9c to 9e are arranged in a laminated manner to form a valve for one phase surrounded by the alternate long and short dash line in FIG.

Since the module and the frames 9a to 9e are electrically connected as described above, a potential difference occurs between the module of each stage and the frame. Therefore, among the layers of the module groups arranged on the same stage parallel to the frames 9a to 9e, the one having the largest potential difference from the frames 9a to 9e is used as a reference, and the insulation distance required for the frame 9a to 9e is maintained. 9e and the module group are arranged. For example, in the configuration example shown in FIG. 11, in the module groups A11 to A14 in the lower half of the first arm A1, the maximum potential difference occurs between the module A14 located at the rearmost end and the first frame 9a. It is placed with an insulation distance corresponding to.

The remaining upper half module groups A15-A
18 is the module A18 located at the end and the first
Since a maximum potential difference occurs between the frame 9a and the frame 9a, the insulation distance corresponding to the potential difference is maintained.

In the module groups A15 to A18 in the upper half of the first arm A1, since the maximum potential difference occurs between the first module A15 and the second frame 9b, the insulation distance corresponding to the potential difference is maintained and the second frame is maintained. 9b is arranged.

[0011]

When the valve is required to have a high pressure and a large electric power as described above, the module becomes large,
Although the valves for arranging these will be high-rise, there is a problem that the equipment cost required for the earthquake-resistant structure to secure the earthquake resistance of the high-rise valve pedestal, or the construction cost of the building that houses it, etc., becomes high, Furthermore, in order to improve mechanical safety and reliability, it was necessary to improve the height of the valve as low as possible.

In the module arrangement shown in FIG. 12, the number of thyristor elements per module is increased to increase the number of modules per arm to six, and the number of stages is reduced to reduce the height. However, arranging 6 modules per stage has the disadvantage of increasing the floor area.

The module arrangement of FIG. 13 has a structure in which four modules are arranged per stage, and two arms are arranged in a space narrowed by a pair of upper and lower frames to form one valve unit 10a. This is a structure in which one phase of the valve is constructed by stacking this in two stages, and the installation area can be made small and the height can be made low as described below {6M below.
/ A-4M / S valve (6 modules / arm, 4 modules / stage)}, but also in this case, there are the following two problems. 1) The length of the insulating column becomes long, the uniformity of material strength becomes a problem, and the manufacturing cost increases. 2) The height of the valve unit becomes high, and when the valve unit is used for transportation, the transportation limit will be exceeded as described later.

[0014]

A thyristor valve according to the present invention comprises a plurality of thyristor module groups each accommodating a thyristor element and its associated circuit components, and a plurality of vertical thyristor modules provided between a pair of upper and lower frames. Insulating columns,
The insulating column is provided with a connecting portion that divides and connects the insulating pillar at an intermediate point between a pair of upper and lower frames. Further, an adjusting mechanism capable of adjusting the length of the insulating pillar is provided at the connecting portion of the plurality of insulating pillars.

[0015]

The thyristor valve according to the present invention configured as described above can maintain the required seismic resistance and insulation characteristics without lowering the rigidity of the thyristor valve, lowers the height of the entire valve, and also has an insulating strut. And the transportability of the valve unit can be improved.

[0016]

【Example】

Example 1. FIG. 1 shows a module arrangement of a valve unit 10 according to the present invention, which has the above-mentioned 6M / mm for the purpose of reducing the layout area and keeping the overall height low.
A-4 M / S sequence. That is, as shown in FIG. 13, four modules are arranged on a stage on the same plane, three stages are arranged between the upper and lower frames 9a and 9b, and
Modules A11 to A16 and Modules A21 to
A26 is divided into two to form two arms, which are vertically stacked in two stages as shown in FIG. 10 to form a valve for one phase.

In this arrangement, the module groups A11 to A14 arranged on the plane of the first stage are separated from the lower frame 9a by a distance h _{g1 based} on the module A14 having the highest potential as described above. It is arranged. Assuming that the potential difference between the arms is V, the potential difference between the frames is 2V, and it is assumed that 12 modules bear the charging duty evenly. If the proportional constant is k, h _g1 is given by the following equation. h _g1 = k · (4/12) · 2V = 2 / 3k · V Second stage and third stage module groups A15 to A22, and A23 to A26 are 4/1 and 4/1, respectively.
Since they have a potential difference of _2.2V , they are also arranged at a distance h _g1 .

The upper frame 9b is based on the module A23 having the lowest potential among the module groups A23 to A26 arranged on the uppermost plane, and the lower frame 9b.
a has the same potential difference relationship as that generated in the module A14, the frame 9b has a module group A23 to A26.
And a distance h _g1 from the upper surface of the.

_Assuming that the height of the module is h _mj , the distance between the upper and lower frames, that is, the height h _t1 of the valve unit is h _t1 = 4h _g1 + 3h _mj = (8/3) · kV + 3h _{mj The} valve is the valve unit 10 described above. The total height H1 is H1 = 2h _t1 = _16/3 · kV + 6h _mj + 3h _fr (1) where h _{fr is the} frame thickness.

In order to compare the valve total height with respect to the module arrangement, the total height H2 of the 8M / A-4M / S valve shown in FIG. 11 is calculated in the same manner as described above: h _g2 = k · (4/8) · V = 1 _{/ 2kV h t2 = 3/2} · kV + 2h mj H2 = 4h t2 + 5h fr = 6kV + 8h mj + 5h fr ... (2) next, by one set changing the module arrangement for small compared to the two equations, the effect of the height reduction I know there is.

However, the height of the valve unit 10 is high in the case of the 6M / A-4M / S arrangement as given by h _t1 and h _t2 . Table 1 shows an example of trial calculation of each value when the V value is 62.5 kV.

[0022]

[Table 1]

According to Table 1, in the case of the 8M / A-4M / S arrangement, the height of the valve unit is around 2.5m, so that the valve unit can be transported in units of 6M / A-4.
In the case of the M / S array, the height is about 4 m, which exceeds the transport limit, so that it is necessary to transport in a divided manner.

Insulating column 8 constituting the valve unit 10
Is generally composed of a FRP hollow circular tube with metal flanges attached to both ends. However, to prevent deterioration of electrical insulation properties, mechanical properties, etc., prevention of air bubble inclusion, heat treatment temperature uniformity, etc. Manufactured under strict control in the process. If the target object becomes long, the uniformity deteriorates, the manufacturing equipment becomes large-scale, and the manufacturing cost becomes high. In order to avoid the above problem, as shown in FIG. 1, the insulating column 8 between the valve units is divided into two parts 8a and 8b, for example, the connecting flange 1
They are mechanically connected by 3a and 13b.

On the other hand, when the valve is excited by an earthquake or the like, the entire valve is deformed in a low order vibration mode. Figure 2
(A), (b) shows the deformation | transformation of the insulation support | pillar 8 for every valve unit, and the moment distribution generated in the insulation support | pillar 8. As shown in FIG. In FIG. 2, the entire valve unit undergoes shear deformation. MA and MB are bending moments acting on both ends of the insulating support column 8 and change depending on the rigidity of the frame or the like to which the end of the insulating support column is fixed. When it is close to the vertically symmetrical structure as shown in FIG. 2A, MA≈MB. As shown in FIG. 2B, the bending moment distribution takes the maximum value MA or MB near the upper and lower frames, changes linearly in the vertical direction, and becomes zero near the center. Therefore, even if the mechanical coupling mechanism is arranged in a portion where the bending moment does not act, the influence on the rigidity is small.

In order to improve the seismic performance, it is necessary to reduce the overall height and to increase the rigidity of the entire valve. Therefore, the connecting flange 13 for connecting the insulating struts 8a and 8b is used.
As shown in the shaded area of FIG. 2A, in which the bending moment generated in the insulating strut 8 is the connecting portion 14 including a and 13b, as shown in the hatched area in FIG. By arranging the module in the range P surrounded by the extended surfaces of the upper surface and the lower surface of the module, the rigidity of the valve is suppressed from being lowered and the seismic performance is maintained.

When the connecting portion 14 of the insulating support column 8 is arranged at a place where the potential gradient is large, the potential distribution is disturbed and the insulation characteristics are affected. The change in potential gradient is small in the space surrounded by the surfaces connecting the upper and lower surfaces of the module installed at the central position between the upper and lower frames 9a and 9b and the end surfaces of the frame.
Therefore, by arranging the connecting portion 14 of the insulating support column 8 in this space, that is, the space P shown by the hatched area in FIG. It did not disturb and did not affect the insulation characteristics.

In the case of the 6M / A-4M / S arrangement, as shown in Table 1, the height of the valve unit 10 is around 4 m, which exceeds the transportation limit. Therefore, when transporting, disconnect the connecting portion 14 of the valve unit 10 as shown in FIG.
Transportation is made possible by dividing into two.

Example 2. The thyristor valve is a stack of the above valve units in two stages, but when the DC output voltage is 500 kV, the height from the ground is 10 m or more. In order to vertically assemble the plurality of mechanism blocks constituting this, it may be necessary to provide a mechanism for absorbing an integration error. As shown in FIG. 2 (b), the vicinity of the frames 9a and 9b is the part that receives the bending moment most strongly, so it is necessary to increase the rigidity.
Incorporating the integrated error absorbing mechanism at this position impairs the strength. Since the bending moment is minimized in the space in which the above-mentioned connecting portion 14 is arranged and there is a margin in terms of strength, even if a length adjusting mechanism is incorporated, the overall seismic resistance is not affected. As the length adjusting mechanism 15,
For example, as shown in FIG. 4, the connection flanges 13a and 13b are fitted with the Juggi bolts 16 between the pitches of the tightening bolts 17, the distance between the connection flanges is adjusted, and the height is adjusted. I am doing it.

Example 3. In the second embodiment, the case where the jack bolt 16 is incorporated into the connection flange 13 as the length adjusting mechanism 15 to adjust the distance between the connection flanges 13 to adjust the height is described. However, as shown in FIG. The metal fitting 18 is separately provided, and the metal fitting 18 fixed to the insulating support 8 is engaged with the metal fitting 18 by a screw structure, and the length in the axial direction is adjusted by rotating the metal fitting, and then the metal fitting 18 is connected by the rotatable tightening flange 13b. May be.

[0031]

As described above, according to the present invention, the rigidity of the valve is lowered because the connecting portion is provided within the predetermined range of the insulating column so that the valve unit can be divided into upper and lower parts while maintaining the material strength and the insulating property. The required seismic performance and insulation characteristics could be maintained without having to do so, and the overall height of the valve could be lowered while maintaining mechanical strength and insulation characteristics. Further, it has a great effect that the manufacturability of the insulating column and the transportability of the valve unit can be improved.

[Brief description of drawings]

FIG. 1 is a front view showing a module arrangement according to the present invention and an arrangement of insulating column connecting portions.

FIG. 2 is a front view showing a state in which the valve unit according to the present invention is acted upon by vibration.

FIG. 3 is an elevational view showing an example of division when the valve unit according to the present invention is transported.

FIG. 4 is a cross-sectional view showing a configuration example of a length adjusting mechanism of an insulating column according to the present invention.

FIG. 5 is a cross-sectional view showing another configuration example of the length adjusting mechanism of the insulating column according to the present invention.

FIG. 6 is an explanatory diagram of an electrical function unit symbol.

FIG. 7 is a 6-phase bridge connection diagram of a rectifying arm of a thyristor valve.

FIG. 8 is a three-phase bridge connection diagram of the rectifying arm of the thyristor valve.

FIG. 9 is a related explanatory diagram of a frame and an arm that constitute the thyristor valve.

FIG. 10 is another related explanatory view of the frame and the arm that constitute the thyristor valve.

FIG. 11 is a layout view of a thyristor module having an 8M / A-4M / S arrangement.

FIG. 12 is a layout view of a thyristor module having a 6M / A-6M / S arrangement.

FIG. 13 is a layout view of a thyristor module having a 6M / A-4M / S arrangement.

FIG. 14 is a perspective view showing a conventional valve body.

FIG. 15 is a component layout view showing the internal configuration of the thyristor module.

[Explanation of symbols]

 1 Thyristor Module 2 Thyristor Element 3 Anode Reactor 4 Resistor 5 Capacitor 6 Storage Case 7 Cooling Water Piping 8a Insulation Strut 8b Insulation Strut 9a Frame 9b Frame 10 Valve Unit 11 Connection Line 12 Metal Flange 13a Connection Flange 13b Connection Flange 14 Connection Part 15 Length Adjusting mechanism 16 Jack bolt 17 Tightening bolt 18 Height adjusting bracket 19 Fixing bracket

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masato Yamada, 3-3-22 Nakanoshima, Kita-ku, Osaka City, Kansai Electric Power Co., Inc. (72) Masahiro Hirose, 2-5 Marunouchi, Takamatsu City Shikoku Electric Power Co., Inc. (72) Inventor Hiroyuki Arakawa 6-15-1 Ginza, Chuo-ku, Tokyo Power source development Co., Ltd. (72) Inventor Kyoichi Otsuka 8-1-1 Tsukaguchihonmachi, Amagasaki Mitsubishi Electric Corporation Itami Works (72 ) Inventor Hitoshi Teramoto 8-1-1 Tsukaguchi Honcho, Amagasaki City Mitsubishi Electric Co., Ltd. Itami Works (72) Inventor Katsushi Yasuda 8-1-1 Tsukaguchi Honcho, Amagasaki City Mitsubishi Electric Corporation Itami Works

Claims (2)

[Claims] 1. A thyristor valve in which a plurality of thyristor module groups, each accommodating a thyristor element and its accessory circuit components, are mounted on a plurality of insulating columns vertically provided between a pair of upper and lower frames and arranged in a plurality of stages. At
A thyristor valve characterized in that an insulating column is divided at a midpoint between a pair of upper and lower frames where the bending moment acting on the insulating column is minimized, and is connected at a connecting portion. 2. The thyristor according to claim 1, wherein an adjusting mechanism capable of adjusting the length of the insulating column is provided at a connecting portion of a plurality of insulating columns vertically provided between a pair of upper and lower frames. valve.