基于电容加压/续流回路的直流开断原理与仿真

Principle and simulation for a novel DC breaker based on freewheeling circuit

随着柔性直流输电技术在电网中不断得到应用,研究和开发合适的直流断路器已经成为当前智能电网技术的重要发展方向。目前已有的三种主要类型直流断路器通过将短路故障电流转移至MOV吸能支路来实施关断,降低了有效开断速度并增加了MOV阀组的吸能量。为此,本文提出了一种基于电容加压/续流回路的新型直流断路器原理,并进行了仿真,验证了所提原理的优越性,并就基于续流原理的直流开断问题进行了讨论。

With the increasing development of VSC-HVDC transmission technology in the connection of renewable energy to power grid,R&D of DC circuit breaker has become an important issue of the smart grid technology.At present,there are three types of DC circuit breakers,switching off by transferring the short-circuit fault current to the MOV energy-absorbing branch,which reduces the effective breaking speed and increases the energy absorption of MOV.Therefore,this paper proposes a new type of DC circuit breaker based on a capacitor freewheeling circuit,then simulation was performed to verify the advantages of the proposed principle,and we also discuss the possible freewheeling circuits for other the DC breakers.