Abstract
DC houses have a number of advantages over conventional AC houses in scenarios where DC distributed resources are integrated and much of the load is also DC. This paper proposes two types of DC house configurations based on FREEDM system solid-state transformer (SST) technology. In order to make a financial case for the DC house, a simulation test bed has been developed. Four types of houses with rooftop PV are modeled: AC house, retrofit DC house, FREEDM hybrid and FREEDM DC house. Annual simulation has been performed for five different locations and the hourly energy usage is estimated. From this, a comprehensive cost benefit analysis has been performed .Net present value and internal rate of return are used as the basis of comparison. The results show that FREEDM DC house is the most cost effective configuration among these four types of houses in the future where rooftop PV and EV are more commonly adopted.
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