Saturable reactor for direct-current transmission converter valve

Abstract

The invention discloses a saturable reactor for a direct-current transmission converter valve, the direct-current transmission converter valve comprises a thyristor level and a saturable reactor whichare connected in parallel through a water path, the saturable reactor is provided with a water path inlet and a water path outlet, and the pressure difference formed between the water path inlet andthe water path outlet is the same as the pressure difference of thyristor level water paths connected in parallel; the saturable reactor comprises an annular coil formed by winding a hollow wire, thecoil is provided with a first wire outlet end and a second wire outlet end which are opposite to each other, and cooling liquid circulates in the wire between the first wire outlet end and the secondwire outlet end; the plurality of iron cores are arranged on the coil at certain intervals in a sleeving manner; an insulating cushion block is arranged between every two adjacent iron cores; and thesplit type shell forms a containing coil and an iron core containing cavity through a connecting assembly. The saturable reactor for the direct-current power transmission converter valve can be bettersuitable for the scenes of thyristor levels and saturable reactors which are connected in parallel through waterways.

Description

technical field [0001] The invention relates to the technical field of power system components, in particular to a saturable reactor for a direct current transmission converter valve. Background technique [0002] The saturable reactor is a key component of the HVDC converter valve. It is responsible for limiting the rate of rise of the thyristor opening current and damping the electromagnetic oscillation caused by stray capacitance during the very short period of time when the converter valve is on. [0003] The existing saturable reactors for DC transmission converter valves mainly include the following methods. Method 1: Use a pair of iron cores coupled with multi-turn coils; Method 2: Fix the number of coil turns, adjust the logarithm of the iron core, and put the coils of the coupled iron cores into the upper and lower covers to realize the module design; Method 3: The logarithm of the iron core is fixed, the number of turns of the coil is adjusted, and the secondary w...

AI Technical Summary

Problems solved by technology

On the whole, the above-mentioned methods of the existing reactors all have certain applicable conditions or have certain defects, and cannot better meet the use requirements of the converter valve.

For example, the saturable reactors suitable for the original large-component converter valves (thyristor stages and saturated reactors connected in parallel with the water circuit for the valve module) are mostly set in mode 3, but since their iron cores and coils are exposed to the air In the middle, after long-term operation, there may be problems such as joint leakage, cable wear and discharge, and iron core sinking.

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