The integrated operation method of emergency generator system for commercial building applied DC distribution system

Increasing renewable energy, ESS and digital loads can be combined with DC power distribution to achieve high energy utilization efficiency. Emergency power supply needs consideration to prepare power failure of AC grid due to characteristic of DC distribution system connected with AC grid and digital loads. The application of emergency generators should be considered as the ESS cannot perfectly satisfy the emergency power supply. However, the slow response characteristic of the emergency generator interrupts the quick stabilization of the DC grid voltage. In this paper, an emergency power supply system using an emergency generator in DC distribution has been proposed. An emergency power supply system using a 13.3 [kW] emergency generator was constructed for DC distribution and an operation method was proposed to minimize the voltage drop occurring at the initial startup. The proposed method is verified by simulation.