Full-solid-state direct-current circuit breaker of direct-current power distribution network

Abstract

The invention relates to a full-solid-state direct-current circuit breaker of a direct-current power distribution network. The full-solid-state direct-current circuit breaker is characterized in that the direct-current circuit breaker is formed by connecting an auxiliary circuit breaker loop, a main circuit breaker loop and an energy absorption loop in parallel, and the auxiliary circuit breaker loop comprises a thyristor switch unit and a modularized full control device switch unit, and the thyristor switch unit and the modularized full control device switch unit are connected in series; the main circuit breaker loop comprises a plurality of press fit full control device switch units, a lightning arrester and a fuser, and a diode bridge type structure is adopted for two-way through flow; the energy absorption loop comprises at least one lightning arrester. The full-solid-state direct-current circuit breaker is novel in topology structure and comprehensive in function, the on-state loss is small in normal operation, the current state can be fast detected, faults can be effectively recognized, two-way current can be cut off in faults, the current turn-off grade is high, the fault removal speed is high, the voltage and energy absorption effect is good in the turn-off process, the rate of rise of fault current is effectively limited, and the series-connection valve banks of the main circuit breaker loop and the full control device of the auxiliary circuit breaker loop can be reliably protected.

Description

technical field [0001] The invention relates to an all-solid-state DC circuit breaker for a DC distribution network, which belongs to the technical field of power electronics and is applied to a DC distribution network with voltage levels up and down 10kV. Background technique [0002] With the development of multi-terminal DC power transmission and distribution technology, DC micro-grid and smart grid technology, DC circuit breakers, as switching devices that carry and break the normal current of DC operating branches and various fault currents within a specified time, are important for improving DC distribution. It is an important means of stability, reliability and flexibility of the power system. It is the basis for the operation, control and protection of DC transmission and distribution networks. The arc extinguishing problem caused by the absence of the zero-crossing point of the DC current, the overvoltage problem caused by the shutdown process, and the energy absorp...

AI Technical Summary

Problems solved by technology

The arc extinguishing problem caused by the absence of the zero-crossing point of the DC current, the overvoltage problem caused by the shutdown process, and the energy absorption problem have brought great difficulties to the development of high-voltage and large-capacity DC circuit breakers. DC circuit breakers have become a technical bottleneck restricting the research and application of DC power grids. one

[0003] The traditional mechanical DC circuit breaker has an action time of tens of milliseconds, which cannot meet the requirements of the DC system to quickly clear the fault, and the mechanical switch is worn due to the arc extinguishing problem, which greatly reduces the service life; the ordinary all-solid-state DC circuit breaker has a fast action speed , but the on-state loss is high; the hybrid DC circuit breaker composed of mechanical switches and solid-state switches has high reliability, but it puts forward higher requirements for the manufacture of high-speed mechanical switches; The action time and cut-off current level are low, which cannot meet the requirements of reliable and rapid fault cleaning

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