Expansion double-electrode direct current transmission system

Abstract

The invention discloses an expansion double-electrode direct current transmission system which comprises a rectification convertor station, a rectification side current conversion unit, a three-electrode power transmission circuit, an inversion side current converting unit and an inversion convertor station. When the expansion double-electrode direct current transmission system normally works, the rectification convertor station controls the magnitude of direct currents by controlling the triggering angle of a thyristor and converts the three-phase alternating currents into double-electrode direct currents in a rectification mode; afterwards, the double-electrode direct currents are converted into three-electrode direct currents through current conversion processing, flow through three transmission lines respectively and undergo current conversion reverse processing. The three-electrode currents are converted into the double-electrode direct currents and the direct currents are converted into three-phase alternating currents through the inversion action of an inversion side thyristor converter and a received end alternating current system is filled with the three-phase alternating currents. Thus, power is transmitted from a sending end alternating current system to the received end alternating current system. Thus, the investment cost is much less than that of a three-electrode direct current transmission system, the transmission capacitance is 1.37 times that of a double-electrode system, consumption loss of extra power will not be introduced into a direct current side, good economical efficiency is achieved and engineering application is facilitated.

Description

technical field [0001] The invention belongs to the technical field of power electronic systems, and in particular relates to an extended bipolar direct current transmission system. Background technique [0002] Today, with the rapid economic development, the consumption of electric energy continues to increase, and at the same time, the investment in transmission and distribution infrastructure is relatively declining. The traditional method of upgrading the power system infrastructure is mainly to build new power plants, erect new transmission lines, build new substations, and add other related equipment. However, experience has shown that every step from obtaining authorizations to selecting routes and building new routes has become extremely difficult, expensive and time-consuming. At the same time, due to the scarcity of land resources, especially in load-intensive areas, it is very difficult to open up new line corridors. In this regard, using the original high-volta...

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Problems solved by technology

However, the introduction of resistors consumes extra power, which is not conducive to practical applications

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