DC circuit breaker energy supply system and control method and device thereof

Abstract

The invention provides a DC circuit breaker energy supply system and a control method and device thereof. The energy supply system comprises a resonant capacitor of which the input end is connected with a low-frequency AC voltage source through a rectification circuit and the output end is connected with a resonant inductor through a switching circuit, wherein the resonant capacitor and the resonant inductor generate resonant current when the switching circuit is conducted and low-frequency alternating current is converted into high-frequency alternating current to be outputted; and an energytaking magnet ring which sleeves on an energy supply cable with the output end connected with a load for converting the high-frequency alternating current into the voltage meeting the load requirements to supply power to the load. Compared with the low-frequency energy supply mode, the low-frequency alternating current is converted into high-frequency alternating current to be outputted so that the size of the energy taking magnet ring can be reduced under the condition of meeting the same power supply requirement and then the size of the high voltage DC circuit breaker system and the cost ofthe system can be reduced.

Description

technical field [0001] The invention relates to the field of electric power protection, in particular to a DC circuit breaker energy supply system and a control method and device thereof. Background technique [0002] Due to its good characteristics, the DC transmission system based on flexible DC transmission has become one of the hotspots in the power field, and will also be an important part of the future grid construction. Due to the relatively low damping of the DC system, the rising rate of the fault current in the DC system is relatively fast. In order to ensure safety, the fault current needs to be cut off within milliseconds. One of the core equipment; compared with mechanical and solid-state high-voltage DC circuit breakers, hybrid high-voltage DC circuit breakers have the advantages of high-speed breaking and low-power operation, and have become the mainstream technology in the industry at this stage. Hybrid high-voltage DC circuit breakers It is composed of ultr...

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is that the existing DC circuit breaker energy supply system has a large volume and high design cost

Images