Module flow balancing water channel used for direct current converter valve

Abstract

The invention provides a module flow balancing water channel used for a direct current converter valve. The water channel comprises a water inlet pipe, a water outlet pipe, saturable reactors, thyristor radiators, damping resistors and a water distribution connecting pipeline. A water channel circuit is composed of a thyristor radiator and damping resistor branch circuit and saturable reactor branch circuits, wherein the thyristor radiator and damping resistor branch circuit and the saturable reactor branch circuits are arranged in a mode with parallel connection and series connection mixed. The water inlet pipe and the water outlet pipe are arranged in parallel, a diagonal water inlet and outlet method is adopted, the thyristor radiators and the damping resistors are connected in series to form a branch circuit which is connected between the water inlet pipe and the water outlet pipe in parallel, and the saturable reactor branch circuits are arranged between the head end of the water inlet pipe and the tail end of the water outlet pipe and between the tail end of the water inlet pipe and the head end of the water outlet pipe respectively. Compared with the prior art, the module flow balancing water channel used for the direct current converter valve has the advantages that flow distribution is even, temperature distribution of thyristors is even, no flow dead zone exists in the water channel, and partial discharge caused by deposition of air and impurities is avoided.

Description

technical field [0001] The invention relates to a flow balancing waterway, in particular to a flow balancing waterway of a module used for a DC converter valve. Background technique [0002] As my country's high-voltage direct current transmission technology becomes increasingly mature, the construction of direct current transmission projects is in a golden period of development. In the high-voltage direct current transmission system, the cooling system is an important component of the heat dissipation system of the converter valve, and its operation directly affects the power transmission capacity of the entire direct current system. Therefore, it is particularly important to ensure the stable, reliable and efficient operation of the cooling system. [0003] The use of pure water cooling is widely used in the DC transmission converter valve cooling system at present, and the cooling performance of the valve module directly affects the stability and reliability of the thyri...

AI Technical Summary

Problems solved by technology

The temperature difference between the water outlet and the water inlet is large, and the thermal stress of the first and last cooled thyristors is inconsistent, which reduces the availability of the thyristors

In order to improve the heating condition of the thyristor at the end of the cooling circuit and improve the cooling consistency, the water inlet and outlet arrangement on the same side of the parallel pipeline is usually adopted, but due to the different paths of each branch, the flow distribution is unbalanced, and the closer to the water inlet and outlet side, the greater the flow , the branch flow far away from the water inlet and outlet side is small, resulting in unbalanced cooling of the thyristors and poor temperature consistency; at the same time, the flow velocity at the end of the water inlet and outlet pipes is low, and it is difficult to discharge the gas and impurities at the blind end of the water pipe, and the increase in the conductivity of the cooling medium causes the insulation level to decrease. , partial discharge and other issues

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