A controllable voltage source oscillation type DC circuit breaker and its application method

By designing a controllable voltage source oscillation DC circuit breaker including main flow branch, current injection branch, voltage oscillation branch and energy dissipation branch, the problem that the existing technology is difficult to meet the dual requirements of technology and economy at the same time, and the effect of DC interruption and equipment cost reduction is achieved.

CN112865042BActive Publication Date: 2025-03-18GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +1
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Patent Information

Application Number
CN202110237003.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-03-03
Publication Date
2025-03-18
Estimated Expiration
2041-03-03

AI Technical Summary

Technical Problem

The existing high-voltage controllable voltage source oscillating DC circuit breakers are difficult to meet the dual requirements of technical and economics for large-scale DC grid construction, which limits their large-scale application in multi-terminal and DC grids.

Method used

A controllable voltage source oscillation DC circuit breaker including the main flow branch, the current injection branch, the voltage oscillation branch and the energy dissipation branch is designed. The reverse current is injected into the main flow branch through the current injection branch, and the current amplitude is increased through the voltage oscillation branch until the arc is completed, and the energy absorption and current clearance are finally completed through the energy dissipation branch.

Benefits of technology

The DC breaking process is realized, reducing the cost and volume of capacitors, reducing the number of power electronic devices, significantly reducing the cost and volume of equipment, and meeting the technical and economic requirements of high-voltage controllable voltage source oscillating DC circuit breakers.

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Abstract

The present invention discloses a controllable voltage source oscillating type DC circuit breaker and an application method thereof, wherein the controllable voltage source oscillating type DC circuit breaker comprises: a main flow branch, a current injection branch, a voltage oscillation branch and an energy dissipation branch, wherein the current injection branch comprises a pulse capacitor and a DC capacitor, the current injection branch is connected in parallel with the main flow branch, the voltage oscillation branch is connected in parallel at both ends of the pulse capacitor, and the energy dissipation branch is connected in parallel with the main flow branch; the main flow branch is used to conduct the DC load current, the voltage oscillation branch is used to change the voltage polarity of the pulse capacitor, the current injection branch is used to realize the pulse capacitor oscillation boost and inject reverse current into the main flow branch, and the energy dissipation branch is used to complete energy dissipation absorption and current removal. By implementing the present invention, the capacitance of the high-voltage capacitor and the number of power electronic devices can be significantly reduced, and the cost and volume of the controllable voltage source oscillating type DC circuit breaker can be greatly reduced.
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