CN-122000179-A - Oil immersed reactor and flexible direct current transmission system

CN122000179ACN 122000179 ACN122000179 ACN 122000179ACN-122000179-A

Abstract

The application discloses an oil immersed reactor and a flexible direct current transmission system, and relates to the technical field of flexible direct current transmission. The oil immersed reactor comprises six groups of electric reactors, wherein the electric reactors corresponding to the multiple groups of bridge arms of the flexible direct current transmission system are integrated, so that two groups of electric reactors corresponding to the upper bridge arm and the lower bridge arm form a two-arm two-phase integrated structure, and three groups of electric reactors corresponding to the upper bridge arm or the lower bridge arm form a single-arm three-phase integrated structure. The two-arm two-phase integrated structure and the single-arm three-phase integrated structure provide larger inductance for a single phase, the overall volume and the occupied area of the reactor are obviously reduced under the condition that the inductance demand is unchanged, and the power density and the space utilization rate of the system are improved.

Inventors

LIU JUNFEI
LI HONGBO
FANG MING
KANG YAHUA
QU GUANGLEI

Assignees

特变电工沈阳变压器集团有限公司

Dates

Publication Date: 20260508
Application Date: 20260209

Claims (10)

1. The oil-immersed reactor is characterized by being applied to a flexible direct current transmission system, wherein the flexible direct current transmission system is provided with three groups of upper bridge arms, lower bridge arms and three-phase flexible direct current transformers, and the oil-immersed reactor comprises six groups of electric-resistance coils; each reactance coil is respectively connected in series in an electrical loop where a corresponding group of upper bridge arms or lower bridge arms are positioned; one ends of the two groups of reactance coils are commonly connected to one phase node of the three-phase flexible direct current transformer between the corresponding group of upper bridge arms and the lower bridge arms, and the other ends of the two groups of reactance coils are respectively connected to the corresponding rectifying devices to form a two-arm two-phase integrated structure; And one ends of the three groups of reactance coils are respectively connected to a corresponding phase node of the three-phase flexible direct current transformer, and the other ends of the three groups of reactance coils are respectively connected to a corresponding rectifying device to form a single-arm three-phase integrated structure.
2. The oil-immersed reactor according to claim 1, wherein the reactor coil is either an air core coil or a core coil.
3. The oil-immersed reactor according to claim 1, wherein the body of the two-arm two-phase integrated structure is a four-column structure, four heart columns are symmetrically designed, and two groups of the electric reactors are respectively arranged on two middle columns.
4. The oil-immersed reactor according to claim 1, wherein the body of the single-arm three-phase integrated structure is of a five-column structure, five heart columns are of a symmetrical design, and three groups of the electric reactors are respectively arranged on the middle three columns.
5. The oil-immersed reactor according to any one of claims 3 or 4, further comprising an auxiliary magnetic shunt; The auxiliary magnetic shunt is arranged on the outer side of the iron yoke of the body and used for guiding and closing a loop to restrain leakage magnetic flux generated by the reactance coil.
6. The oil-immersed reactor according to claim 5, wherein the auxiliary magnetic shunt is a closed frame structure made of silicon steel sheets.
7. The oil-immersed reactor according to claim 5, further comprising a plurality of auxiliary magnetic shunts, wherein each of the auxiliary magnetic shunts surrounds a corresponding magnetic leakage main emission region outside the yoke of the body in all directions.
8. The oil-immersed reactor according to any one of claims 3 or 4, wherein the body is placed in a tank and suspended inside the tank.
9. The oil-immersed reactor according to claim 8, further comprising a first vibration damping substance, a second vibration damping substance, and a third vibration damping substance; The first vibration reduction damper is arranged between the reactance coil and the corresponding main magnetic circuit; The second vibration reduction damper is arranged between the bottom of the body and the bottom of the oil tank; the third vibration reduction damper is arranged between the side face of the body and the side face of the oil tank.
10. A flexible direct current transmission system, characterized in that it comprises an oil tank and an oil-immersed reactor according to any one of claims 1-9.

Description

Oil immersed reactor and flexible direct current transmission system Technical Field The application relates to the technical field of flexible direct current transmission, in particular to an oil immersed reactor and a flexible direct current transmission system. Background The reactor is an important component element of the flexible direct current transmission system, and mainly plays roles in inhibiting loop current between bridge arms and inhibiting bridge arm fault current which rises too fast in short circuit, and can also control power transmission, filtering and inhibit alternating current side current fluctuation. At present, all domestic and foreign flexible direct current engineering adopts a dry type air core reactor structure, but the dry type air core reactor is influenced by parameters such as insulation level, current and the like, the inductance of a single coil is smaller, each coil can be made into one unit, and the occupied area is larger after a plurality of coils are connected in series and the antimagnetic space is considered. In addition, the reactor coil is arranged on the post insulator, is sensitive to earthquake, and has higher requirements on the climbing distance and mechanical strength of the post insulator. Disclosure of Invention The application mainly aims to provide an oil immersed reactor and a flexible direct current transmission system, and aims to solve the technical problem of how to reduce the volume of the reactor. In order to achieve the above purpose, the embodiment of the application provides an oil-immersed reactor, which is applied to a flexible direct current transmission system, wherein the flexible direct current transmission system is provided with three groups of upper bridge arms, lower bridge arms and three-phase flexible direct current transformers, and the oil-immersed reactor comprises six groups of electric-resistance coils; each reactance coil is respectively connected in series in an electrical loop where a corresponding group of upper bridge arms or lower bridge arms are positioned; one ends of the two groups of reactance coils are commonly connected to one phase node of the three-phase flexible direct current transformer between the corresponding group of upper bridge arms and the lower bridge arms, and the other ends of the two groups of reactance coils are respectively connected to the corresponding rectifying devices to form a two-arm two-phase integrated structure; and one ends of the three groups of reactance coils are respectively connected to a corresponding phase node of the three-phase flexible direct current transformer, and the other ends of the three groups of reactance coils are respectively connected to a corresponding rectifying device to form a single-arm three-phase integrated structure. In one embodiment, the reactance coil is either an air core coil or a core coil. In an embodiment, the body of the two-arm two-phase integrated structure is of a four-column structure, four heart columns are symmetrically designed, and two groups of reactance coils are respectively arranged on the middle two columns. In an embodiment, the body of the single-arm three-phase integrated structure is of a five-column structure, five heart columns are symmetrically designed, and three groups of reactance coils are respectively arranged on the middle three columns. In one embodiment, the oil-immersed reactor further comprises an auxiliary magnetic shunt; The auxiliary magnetic shunt is arranged outside the iron yoke of the body and used for guiding and closing the leakage magnetic flux generated by the reactance coil. In one embodiment, the auxiliary magnetic shunt is a closed frame structure made of silicon steel sheet. In one embodiment, the oil immersed reactor further comprises a plurality of auxiliary magnetic shunts, wherein each auxiliary magnetic shunt surrounds the corresponding magnetic leakage main emission area outside the iron yoke of the reactor body in an omnibearing manner. In one embodiment, the body is placed in the tank and suspended inside the tank. In one embodiment, the oil immersed reactor further comprises a first vibration reduction damper, a second vibration reduction damper and a third vibration reduction damper; The first vibration reduction damper is arranged between the reactance coil and the corresponding main magnetic circuit; the second vibration reduction damper is arranged between the bottom of the body and the bottom of the oil tank; The third vibration reduction damper is arranged between the side surface of the body and the side surface of the oil tank. In addition, in order to achieve the above purpose, the embodiment of the application also provides a flexible direct current transmission system, which comprises an oil tank and the oil-immersed reactor. The embodiment of the application provides an oil-immersed reactor and a flexible direct current transmission system, wherein the oil-immersed reactor comprises s