Saturable Reactor for DC Transmission Converter Valve

Abstract

The invention discloses a saturated reactor for a DC power transmission converter valve. The DC power transmission converter valve includes a thyristor stage connected in parallel with a waterway and a saturated reactor. The saturated reactor has a waterway inlet and a waterway outlet, and a waterway inlet and a waterway outlet. The pressure difference formed between them is the same as the pressure difference of the parallel thyristor-level waterway; the saturated reactor includes: a ring-shaped coil wound by a hollow wire, and the coil has opposite first and second outlet terminals. Coolant circulates in the wire between the first outlet terminal and the second outlet terminal; multiple iron cores are sleeved on the coil at a certain interval, and insulation is provided between adjacent two iron cores. Pad block; split shell, the split shell forms an accommodating cavity containing coils and iron cores through connecting components. The saturable reactor for a direct current transmission converter valve provided by the present invention is preferably applicable to a scenario where a thyristor stage and a saturated reactor connected in parallel by a water circuit are used.

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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