Active resistance-capacitance DC current limiter and control method based on dual capacitor oscillation

Abstract

The invention discloses an active resistance-capacitance DC current limiter based on dual-capacitor oscillation and a control method thereof, which include a parallel flow-through branch and a resistance-capacitance branch, the flow-through branch is composed of a mechanical switch, and the resistance-capacitance branch is composed of a high-voltage arm The capacitor branch, the low-voltage arm capacitor branch and the semiconductor component are connected in series; the high-voltage arm capacitor branch includes a parallel high-voltage capacitor, an arrester, and a controllable discharge branch; the low-voltage arm capacitor branch includes a parallel low-voltage capacitor and a controllable charging power supply, and the semiconductor The component is composed of a thyristor and a diode in antiparallel connection, the negative pole of the low-voltage capacitor is electrically connected with the high-voltage capacitor, and the positive pole of the low-voltage capacitor is electrically connected with the anode of the semiconductor component. The beneficial effects of the present invention are: the current limiter in the present invention is mainly composed of conventional power equipment such as mechanical switches, high-voltage capacitors, low-voltage capacitors, thyristors and diodes, and the cost is low. At the same time, because no superconducting materials or power electronic devices are used, the limited The daily operation and maintenance of the flow meter is easier.

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...

AI Technical Summary

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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