High-voltage DC breaker and control method thereof

The invention discloses a high-voltage DC breaker and a control method thereof. The high-voltage DC breaker comprises an on-state current branch, a breaking current branch, and a bridge branch. The on-state current branch is formed by a mechanical switch and a current transfer module provided with a fully-controlled device and guarantees low-on-state loss in a normal on state. The breaking current branch is formed by a nonlinear resistor and a fully-controlled device series valve group which are connected in parallel. The bridge branch comprises two bridge arms formed by four same commutation modules. Each commutation module is formed by an uncontrolled device series valve group and an inductor which are connected in series. The bridge branch enables the breaking current branch to be capable of breaking bidirectional bidirectional line current and reduces the number of fully-controlled devices and equipment cost.