Novel cascading full-bridge high-voltage direct current breaker and control method thereof

Abstract

The invention provides a novel cascading full-bridge high-voltage direct current breaker and a control method thereof. The novel cascading full-bridge high-voltage direct current breaker comprises a main through-flow branch, a transfer current branch and an energy absorbing branch which are in parallel connection with each other, wherein a full-bridge module in the main through-flow branch and the transfer current branch comprises a first resistor, a first capacitor, a first switch and four full-control power electronic devices; the four full-control power electronic devices and the first capacitor form a power module with a full-bridge structure; the first resistor is serially connected with the first switch and then is in parallel connection with the first capacitor. Compared with the prior art, the novel cascading full-bridge high-voltage direct current breaker and the control method thereof provided by the invention have the advantages that the first capacitor can quickly discharge through the first resistor under the action of the first switch, the blocking state can be quickly recovered after the discharging of the first capacitor is ended, the capacitor voltage of each low-voltage capacitor is zero when the high-voltage direct current breaker is switched on, the full-control power electronic devices are not discharged and the high-voltage direct current breaker is not damaged.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a novel cascaded full-bridge high-voltage direct current circuit breaker and a control method thereof. Background technique [0002] The hybrid high-voltage DC circuit breaker composed of mechanical switches and fully-controlled power electronic devices can effectively break the DC of the multi-terminal flexible DC grid due to its low loss characteristics of mechanical switches and fast breaking characteristics of power electronic devices. . However, the breaking capacity of the current hybrid DC circuit breaker is limited by the breaking capacity of a single power electronic device, and its breaking current is less than 10kA, which is difficult to meet the actual breaking current demand of the flexible branch circuit breaking system. At the same time, it is difficult for the hybrid DC circuit breaker to quickly release the capacitor voltage inside the power electronic...

AI Technical Summary

Problems solved by technology

However, the breaking capacity of the current hybrid DC circuit breaker is limited by the breaking capacity of a single power electronic device, and its breaking current is less than 10kA, which is difficult to meet the actual breaking current demand of the flexible branch circuit breaking system

At the same time, it is difficult for the hybrid DC circuit breaker to quickly release the capacitor voltage inside the power electronic device unit after the breaking is completed, resulting in damage due to DC short circuit during rapid reclosing

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