CN-122000180-A - Saturation reactor and power electronic switch

CN122000180ACN 122000180 ACN122000180 ACN 122000180ACN-122000180-A

Abstract

The invention discloses a saturation resistor and a power electronic switch, which relate to the technical field of power electronic switches and are used for solving the problems that in the prior art, the saturation resistor is large in parameter margin, heavy in weight and heavy in volume, is not suitable for protecting a single-stage thyristor in a low-voltage valve assembly and cannot meet the application requirement of the low-voltage valve assembly. The saturable reactor provided by the invention has the advantages of simple structure, more compact volume and lower voltage level, can realize that a single thyristor is configured with a single saturable reactor of the invention, and can also realize the performance of the original one saturable reactor by connecting a plurality of the saturable reactors of the invention in series.

Inventors

GAO CHONG
WANG CHENGHAO
SHENG CAIWANG
WANG ZHIXIANG
ZHANG JUANJUAN
DU ZHAOXIN
ZHOU DESHENG

Assignees

国网智能电网研究院有限公司
国网上海市电力公司
中国电力科学研究院有限公司

Dates

Publication Date: 20260508
Application Date: 20241104

Claims (13)

1. The saturation reactor is characterized by comprising an iron core, a flow guide column, a first electrode plate and a second electrode plate; The first electrode plate and the second electrode plate are respectively fixed at two ends of the flow guiding column; The first electrode plate and the second electrode plate are used as leading-out busbar of the saturation reactor; The core is closed around the guide post and/or the guide post is wound around the core.
2. A saturable reactor according to claim 1, wherein said guide posts are wound around said core to form a coil structure, said guide posts being electromagnetically coupled to said core.
3. A saturable reactor according to claim 1, wherein the number of guide posts is plural, each guide post passing through a plurality of cores, each core being closed around a corresponding guide post.
4. A saturable reactor according to claim 1, wherein said plurality of guide studs is provided, said core being closed around a plurality of said guide studs.
5. A saturable reactor according to claim 3 or 4, wherein a plurality of said guide posts are arranged in a matrix, circular or linear arrangement.
6. A saturable reactor according to claim 1, wherein the first and second electrode plates are made of a metallic conductive material.
7. A saturable reactor according to claim 1, wherein the first and second electrode plates are circular in configuration.
8. A saturable reactor according to claim 1, wherein the first electrode plates and the second electrode plates at both ends of the guide post are parallel to each other.
9. A power electronic switch comprising a thyristor and a saturable reactor according to any one of claims 1 to 8; And the leading-out busbar of the saturation reactor is in contact with the cathode or the anode of the thyristor for electric connection.
10. The power electronic switch according to claim 9, wherein the number of thyristors is n, the number of saturable reactors is m, n and m are integers not less than 1, and when m is greater than 1, the m saturable reactors are connected end to end; And n thyristors are connected in series and then are in contact with the leading-out busbar of the m saturation reactors for electric connection.
11. The power electronic switch according to claim 9, further comprising a radiator, wherein a plurality of radiators are arranged at intervals, the thyristor or the saturable reactor is arranged between two adjacent radiators, the cathode or the anode of the thyristor is in contact with the radiator to be electrically connected, and the lead-out busbar of the saturable reactor is in contact with the radiator to be electrically connected.
12. A power electronic switch according to claim 9, wherein the thyristor and the saturable reactor are press-fitted using a press-fitting structure.
13. A power electronic switch according to claim 12 wherein said press-fit structure comprises an insulating pull rod; The thyristor and the saturation reactor are placed on the press-fit end plate on one side, a disc spring is fixed on the press-fit end plate on the other side, and the disc spring applies pressure to the thyristor and the saturation reactor for press-fit.

Description

Saturation reactor and power electronic switch Technical Field The invention relates to the technical field of power electronic switches, in particular to a saturation resistor and a power electronic switch. Background Thyristors are important switching elements in conventional dc transmission converter valves, and saturable reactors are important components for protecting thyristors in the converter valves. The high-voltage power supply device has the main effects that the high-voltage power supply device shows large impedance at the moment of switching on the thyristor so as to inhibit the excessively rapid increase of switching on surge current, meanwhile, the saturation reactor also plays a certain damping role, the zero crossing of the first trough current during oscillation is avoided, and as load current increases, the saturation reactor gradually saturates, the saturated impedance is small, and therefore the active and reactive power loss of a converter valve is not increased. In addition, in the case of transient surge overvoltage, the saturable reactor will also bear most of the peak voltage, thereby reducing the voltage stress of the thyristor. The saturation reactors are magnetic elements, one saturation reactor in the existing direct current engineering converter valve can generally protect 3-8-level thyristors, and the low-voltage valve assembly structure generally adopts a mode that the thyristors are integrally pressed and then connected with the saturation reactors in series. However, with the evolution of the converter topology, a single-stage thyristor series structure appears in the low-voltage valve assembly, and an independent saturation reactor is also required to be configured for protecting the safe and reliable opening of a single thyristor. However, the existing saturation resistor is large in parameter margin, high in operating voltage and insulation grade, heavy in weight and size, and not suitable for protecting a single-stage thyristor in a low-voltage valve assembly, and cannot meet application requirements of the low-voltage valve assembly. Disclosure of Invention The saturation resistor aims to solve the problems that the saturation resistor in the prior art is large in parameter margin, heavy in weight and heavy in volume, is not suitable for protecting a single-stage thyristor in a low-voltage valve assembly, and cannot meet the application requirement of the low-voltage valve assembly. The invention aims at adopting the following technical scheme: in a first aspect, the invention provides a saturable reactor, which comprises an iron core, a flow guide column, a first electrode plate and a second electrode plate; The first electrode plate and the second electrode plate are respectively fixed at two ends of the flow guiding column; The first electrode plate and the second electrode plate are used as leading-out busbar of the saturation reactor; The core is closed around the guide post and/or the guide post is wound around the core. Preferably, the guide post is wound on the iron core to form a coil structure, and the guide post and the iron core are electromagnetically coupled. Preferably, the guide posts are multiple, each guide post correspondingly penetrates through a plurality of iron cores, and the plurality of iron cores are closed and surround the corresponding guide posts. Preferably, the guide posts are a plurality of, and the iron core is closed to surround a plurality of guide posts. Further, the plurality of flow guide columns are distributed in a matrix, circular or linear mode. Preferably, the first electrode plate and the second electrode plate are made of metal conductive materials. Preferably, the first electrode plate and the second electrode plate are in a circular structure. Preferably, the first electrode plates and the second electrode plates at two ends of the flow guiding column are parallel to each other. In a second aspect, the present invention provides a power electronic switch comprising a thyristor and a saturable reactor according to any one of the preceding claims; And the leading-out busbar of the saturation reactor is in contact with the cathode or the anode of the thyristor for electric connection. Preferably, the number of the thyristors is n, the number of the saturation reactors is m, n and m are integers not smaller than 1, and when m is larger than 1, the m saturation reactors are connected end to end; And n thyristors are connected in series and then are in contact with the leading-out busbar of the m saturation reactors for electric connection. The device comprises a plurality of thyristors, a plurality of saturable reactors, a plurality of heat sinks and a plurality of power switches, wherein the thyristors or the saturable reactors are arranged between two adjacent heat sinks at intervals, the cathodes or the anodes of the thyristors are in contact with the heat sinks for electric connection, and the leading-out busbar of the sat