Active resistance-capacitance type direct current limiter based on double-capacitor oscillation and control method

Abstract

The invention discloses an active resistance-capacitance type direct current limiter based on double-capacitor oscillation and a control method. The active resistance-capacitance type direct current limiter comprises a through-flow branch and a resistance-capacitance branch which are connected in parallel, the through-flow branch is composed of a mechanical switch, and the resistance-capacitance branch is composed of a high-voltage arm capacitor branch, a low-voltage arm capacitor branch and a semiconductor assembly which are connected in series. The high-voltage arm capacitor branch comprisesa high-voltage capacitor, a lightning arrester and a controllable discharge branch which are connected in parallel, the low-voltage arm capacitor branch comprises a low-voltage capacitor and a controllable charging power supply which are connected in parallel, and the semiconductor assembly is formed by antiparallel connection of a thyristor and a diode. The cathode of the low-voltage capacitor is electrically connected with the high-voltage capacitor, and the anode of the low-voltage capacitor is electrically connected with the anode of the semiconductor assembly. The beneficial effects of the present invention are that the current limiter is mainly composed of the mechanical switch, the high-voltage capacitor, the low-voltage capacitor, the thyristor, the diode and other conventional power devices, so that the manufacturing cost is low; and meanwhile due to the fact that the superconducting materials or power electronic devices are not applied, the daily operation and maintenance ofthe current limiter are simpler and more convenient.

Description

technical field [0001] The invention relates to the technical field of power equipment, in particular to an active resistance-capacitance DC current limiter and a control method based on double-capacitor oscillation. Background technique [0002] Hybrid multi-terminal DC transmission system is an important part of my country's long-distance transmission system. After a short-circuit fault occurs in the hybrid multi-terminal DC transmission system, the voltage source converter will feed the fault current to the fault point. For the fault current component fed by the voltage source converter, its flow path has small damping, fast rising speed and Cannot be cleared quickly by controlling the inverter. The voltage source converter is mainly composed of fully-controlled power electronic devices (IGBT), and its ability to withstand surge current is weak. Therefore, this part of the fault current may damage key equipment such as the converter, and then pose a serious threat to the...

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Problems solved by technology

[0004] In view of the above problems, the present invention proposes an active resistance-capacitance DC current limiter and a control method based on dual-capacitor oscillation, which mainly solves the problems of high cost and difficult operation and maintenance of the active DC current limiter

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