JPS6358035B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thyristor valve used in direct current power transmission or interconnection between different frequency power systems, and more particularly to a thyristor valve having an earthquake-resistant structure that is resistant to earthquakes and vibrations.

In recent years, advances in power thyristors have been remarkable, with highly reliable high-voltage, large-current thyristors being developed, and thyristor valves using these thyristors tending to have larger capacities year by year.

Typically, thyristor valves are connected to a three-phase bridge connection as shown in FIG. In Figure 1, the three-phase bridge includes low pressure side (ground side) thyristor valves 1A, 1B, 1C and high pressure side thyristor valve 2.
It is composed of A, 2B, and 2C. Furthermore, as shown in Fig. 2, a 6-bridge bridge connection system is also used in which the arrangement shown in Fig. 1 is connected in cascade, and furthermore, thyristor valves 3A, 3B, 3C, 4A, 4 are connected to the high pressure side.
It consists of 12 units by connecting B and 4C.

Recently, in such a thyristor valve configuration, a thyristor valve in which a low-pressure side thyristor valve 1A and a high-pressure side thyristor valve 2A are stacked to form an integrated structure, as shown in Fig. 3, has been adopted in order to reduce the size of the converter station. As shown in FIG. 4, a thyristor valve having a four-stage stacked configuration in which thyristor valves 1A, 2A, 3A, and 4A are stacked is also employed.

The height of the thyristor valves configured in multiple stacks as above is 125KV for each unit valve.
As the 1200A rating is 5 to 6 m in Figure 3 and 10 to 12 m in Figure 4, the seismic strength of thyristor valves becomes a serious issue in earthquake-prone countries like Japan.

The earthquake-resistant structure of a conventional thyristor valve will be explained below with reference to FIGS. 5 to 11. Figure 5~
Fig. 8 is a detailed diagram of the two-stage thyristor valve in Fig. 2, and 5 is a thyristor module housing multiple thyristors and their associated circuits such as resistors, capacitors, reactors, and ignition circuits; 5B is a thyristor module on the front side, and 5C and 5D are thyristor modules on the back side. 6 is an insulating column or insulator that insulates and supports the thyristor module 5, 7 is an upper and lower frame of the thyristor valve, 8 is a connecting conductor that connects the front side and back side modules, 9 is an AC input terminal, and 10 is a DC output terminal. be.

As shown in this diagram, thyristor valves 1A and 2A
is constructed by connecting each module 5 with a connecting conductor 8.

When a thyristor valve having such a configuration is modeled for seismic calculation using the three-dimensional finite element method, the results are shown in FIGS. 9 to 11. In other words, in this diagram, module 5 is 11, and insulation column 6 is
The upper and lower frames 12 and 7 are modeled as each member 13. Therefore, when performing strength analysis on the model shown in this figure, the strength in the left and right direction in the front view of FIG. With respect to the front and back sides of the thyristor valve, the only stiffness acting in the lateral direction of each insulating support member 12 is the upper and lower frame members 13, and the rigidity is very low.
In terms of strength, the thyristor valve is weak in the front-back direction and has large deflection, which is a problem in terms of earthquake resistance.

It is an object of the present invention to provide a thyristor valve which solves the above-mentioned problems, has high earthquake resistance, does not cause any increase in cost, and does not cause any problems in terms of insulation.

The present invention will be explained below with reference to FIGS. 12 to 14. Figures 12 to 14 are diagrams in which Figures 6 to 8 are modeled for seismic strength calculation.

In this figure, 11, 12, and 13 indicate the same members as in FIG. 10, and 14 indicates a member as a stiffener between the insulating support members 12 according to the present invention. In other words, in FIG. 5 (A-A cross section in FIG. 7), the module 5 on the right front side
B and the back side module 5C are connected by the connecting conductor 8 and have almost the same potential, and furthermore, the left front side module 5A and the back side module 5D are connected to the upper or lower module, respectively, so they are also connected to the top and bottom, respectively. The potential is almost the same as that of the module. Therefore, by making the connecting conductor 8 between the modules on the front and back sides of the thyristor valve sufficiently rigid in terms of strength without causing any insulation problems, it can be used as a member between the insulating support members 12 in this figure. Therefore, the rigidity of the thyristor valve in the longitudinal direction is greatly improved by the member 14, and it is possible to suppress vibration to a small extent, and the seismic performance of the thyristor valve is significantly improved. Furthermore, since it is sufficient to strengthen the members that connect parts with substantially the same potential, there is no problem with insulation and there is almost no increase in cost.

FIG. 15 shows another embodiment of the present invention, in which the connecting conductor 8 itself does not serve as a stiffness between the insulating columns 6, but a separate frame 15 made of iron or the like with sufficient strength is used as an insulator. Attached between the columns 6, the connecting conductor 8 can also be attached to the iron frame 15 simply as an electrical connection.

As described above, according to the present invention, the seismic performance of the thyristor valve can be significantly improved without causing a significant increase in cost, and since the electrical potentials are reinforced, there is no need to pose any problems regarding insulation.

[Brief explanation of drawings]

Figures 1 and 2 are wiring diagrams of thyristor valves,
3 and 4 are diagrams of a multi-stage thyristor valve to which the present invention is applied, FIG. 5 is a cross section taken along line A-A in FIG. Figure 7 is the right side view, Figure 7 is the front view, Figure 8 is the left side view of Figure 7, Figures 9 to 11 are modeled for seismic calculation of the thyristor valves in Figures 6 to 8. Conventional seismic calculation model diagram, Part 1
2 to 14 are seismic calculation model diagrams according to the present invention, and FIG. 15 is a detailed side view of a thyristor valve showing another embodiment of the present invention. 1A, 1B, 1C...Low pressure side thyristor valve, 2A, 2B, 2C...High pressure side thyristor valve, 3A, 3B, 3C, 4A, 4B, 4C...Thyristor valve, 5, 5A, 5B, 5C, 5D...
...Thyristor module, 6...Insulation column, 7...
... Upper and lower frames, 8 ... Connection conductors, 9 ... AC input terminals, 10 ... DC output terminals, 11 ... Members that indicate modules in seismic calculations, 12 ... Members that indicate insulated columns in seismic calculations, 13 ...For seismic calculations,
A member showing the upper and lower frames, 14... A member showing a connecting conductor for seismic calculation, 15... A reinforcing frame as a stiffness between the insulating columns.

Claims (1)

[Claims] 1 A thyristor module containing multiple thyristors and their attached circuits is insulated and supported by an insulating column, and a large number of thyristor valves are connected in each stage to obtain the specified voltage and current. The connecting conductor that electrically connects the matching modules and the connecting conductor that electrically connects the upper and lower modules are reinforced with highly rigid materials,
A thyristor valve characterized in that the reinforcing member is fixed to an insulating column to create an earthquake-resistant structure.