The HVDC system has many significant benefits and is widely used around the world. The protection of HVDC system is always\nan issue, which should be solved. This paper presents the working principle of different protection schemes. The advantages and\ndisadvantages of these protection schemes are also introduced. In order to solve the HVDC fault, two protection strategies are\nproposed.One design focusses on the topologies of theHVDC breaker in theHVDC line, such as all-solidHVDC breaker, resonant\nHVDC breaker, and hybrid HVDC breaker. The other design is from the viewpoint of converter topology, which has two types.\nOne type generates the counter-emf in arms, such as full bridgeMMC, hybridMMC, and clamp-doubleMMC. The other type cuts\noff the current path fromthe AC side to the DC side, which is also introduced in this paper. Some performances of these topologies\nare compared, such as switching time and efficiency.
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