Since each branch of the multiterminal DC circuit system relies on the DC circuit breaker for breaking and fault isolation, the prohibitive cost and huge volume of the Hybrid DC Circuit Breaker (HCB) limit its development and broad application in multiterminal flexible DC systems. Multiport hybrid DC circuit breaker (MP-HDCCB) based on device and branch sharing reduces the configuration cost of the circuit breaker to a certain extent. In order to further reduce the cost of MP-HDCCB, a novel MP-HDCCB topology based on hybrid switching devices is proposed, adopting full controlled switching devices to achieve rapidity of breaking fault current, and using semi-controlled switching devices in series to withstand the transient interruption voltage (TIV), so as to reduce the construction cost and technical difficulty. In this paper, the working principle and fault breaking strategy of the topology are introduced in detail, then the parameters of the major circuit are analyzed theoretically, and the parameter design of each branch is given. In the end, the rationality and validity of the proposed topology is tested and verified by simulations and experimental tests.

Satellite electrical power supply system requires higher redundancy and reliability. The failure of the secondary power supply of the power distribution unit will directly lead to the unavailability of the load. The matrix switch can connect multiple secondary power supplies to multiple loads to improve the fault tolerance of the distribution unit. As the number of redundant switches increases, the process of fault reconstruction becomes more complex. In this paper, a matrix switch fault reconstruction method based on 0–1 integer programming is proposed. This method can reconstruct the matrix switch for different fault modes to meet the electrical power supply and protection requirements of the load. Compared with the general fault countermeasure, this method has independent decision‐making ability, can be expanded by modifying a few parameters, and can be integrated into the management of the whole satellite power supply system. A 500‐W satellite power supply system experimental platform was built, and a matrix distribution switch unit prototype meeting the requirements of integration and low volume was manufactured. The experimental results verify the effectiveness of the reconstruction strategy when dealing with multiple faults in different locations.