Abstract
To prepare for potential power outages, an increasing number of homes have been equipped with emergency power supplies. Although a grid-disconnected inverter with a battery is promising as an emergency power supply, in order to use home appliances continuously in the same manner as in normal times, the inverter needs to build a single-phase three-wire system as well as the commercial grid. To solve this problem, we propose the theory of virtual synchronous generator (VSG). This control method is developed expanding the previous method for a single-phase two-wired system to a single-phase three-wire system.Because the VSG can supply unbalanced power as same as the commercial grid, there is no need to reconnect home appliances to dedicated outlets, and it is possible to realize uninterruptible power supply to home appliances for daily use at the sudden power failure.
