Redundancy Design of Solid-State Transformer for Medium Voltage DC-DC Applications Considering Cost and Availability

Recently, the DC-DC solid-state transformer concept is becoming more and more popular for medium voltage applications. This architecture due to its modularity, has the potential to present high levels of reliability. However, there is lack of proper method for redundancy design in terms of the total cost of ownership. In this paper, we examine the reliability alongside the total cost of ownership of the architecture. An optimization method for choosing the number of redundant modules while applying the minimum total cost of ownership is provided. A case study is given to demonstrate the proposed method.