LC buffer current-limiting circuit-based hybrid DC circuit breaker
A DC circuit breaker and current-limiting circuit technology, applied to emergency protection circuit devices, electrical components, etc., can solve problems such as increasing the difficulty of voltage equalization and current equalization control, increasing the cost and volume of circuit breakers, and breaking the fault current pressure. Achieve the effects of low cost, faster resection speed and lower system cost
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[0022] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0023] The hybrid DC circuit breaker based on the LC buffer current-limiting circuit of the present invention is composed of two parts, an auxiliary branch circuit and a main branch circuit connected in parallel, and an auxiliary DC switch and a main DC switch are respectively provided; wherein, the auxiliary DC switch is composed of a fast isolation Switch S1 and IGBT valve group T1 are connected in series, and the main DC switch is composed of IGBT valve group T2 and metal oxide arrester MOA in parallel. The IGBT valve groups T1 and T2 are composed of several IGBT units connected in series, and each IGBT unit includes two IGBT modules in reverse series. In the main branch, each IGBT unit is connected in parallel with a metal oxide arrester MOA.
[0024] An LC buffer current-limiting circuit is set in series in the main branch, and its structure is: ...
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