Mixed solid state DC current-limiting type circuit breaker

Abstract

The invention relates to a mixed solid state DC current-limiting type circuit breaker comprising a rectifying synchronous generator or a DC bus (1), a high-speed repulsion force mechanical switch (2),a composite electronic power switch (3), an on-state switch (4), a first buffer circuit (5), a second buffer circuit (6), a high resistance current-limiting circuit (7), a reverse voltage charging circuit (8), a freewheeling circuit (9), a smoothing reactor (10) and a direct current load (11). The high resistance current-limiting circuit provided by the invention is continuously on after the composite electronic power switch is switched off, so that the direct current power system of the ship is more stable; the freewheeling circuit is arranged on the load side, so that after the direct current circuit is broken, a release loop is provided for energy stored in the direct current circuit and the load, and the raising speed of the short circuit current is limited; the current-limiting rangeof the short circuit current can be self-designed according to the requirement of the direct current system of the ship, the breaking speed is fast, the raising speed of the short circuit current ofthe direct current circuit and the range of the short circuit current are limited, and the short circuit current of the direct current circuit is effectively broken.

Description

technical field [0001] The invention relates to a circuit breaker, in particular to a hybrid solid-state DC current-limiting circuit breaker, which belongs to the field of power system automation, and belongs to the short-circuit current-limiting and circuit breaking protection technology of DC power transmission. Background technique [0002] The ship power system belongs to the limited power grid. Compared with the land power short circuit fault, when a short circuit fault occurs at a single point of the ship power station, the short circuit current has the characteristics of large peak value and short maintenance time. The excessive short circuit peak current has exceeded the existing ship circuit breaker. The limit connection and breaking capacity of the circuit breaker makes it more difficult to achieve graded protection of the circuit breaker, and even cause a power outage on the whole ship in severe cases. Therefore, it has become a hot research topic at home and abro...

AI Technical Summary

Problems solved by technology

The solid-state switch composed of power semiconductor devices has the advantages of no arc, rapid breaking and high reliability, but at the same time has the disadvantages of limited capacity, poor overload capacity, and large device loss, which greatly limits the application of solid-state switches in ship power systems. application in

Images