Economic Evaluation of DC Smart House Groups Considering Electric Vehicle Operation Patterns
Abstract
Smart houses, which have installed on-site distributed generators such as photovoltaics and batteries and manage their own energy usage using information technology, are being studied and developed around the world. Most of the facilities in a smart house are operated as DC systems; however, conventional supply systems are AC. Moreover, the number of electric vehicles (EV), which also need DC power, have been increasing on the residential side. Therefore, a DC power supply system for smart houses can reduce the number of power converters, conversion losses, and electric charges. The initial and running costs of DC- and AC-based smart houses were calculated under various conditions in this paper. It was concluded that DC-based smart houses have lower costs than AC-based ones regardless of the AC/DC ratio in the load and in the use of EV.
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