| 摘要 |
PURPOSE:To improve power supply, safety and system efficiency during power interruption or faults, by providing a power interruption countermeasure for a main power system and a reverse flow countermeasure upon occurrence of a fault to an inverter type power storage system which stores midnight power and discharges power at a peak demand. CONSTITUTION:A system shown by a solid line 3 is a main system for feeding power directly from a substation 2 to a load 7 and the system shown by a dot and dash line 8 is a power storage system. Midnight power is charged through inverter 13, 14 into a battery 15. When base power of the main system is insufficient in day time, battery power is fed through the inverters 13, 14 to the loads 7, 20. Upon occurrence of fault in the power supply system, circuit breakers 18, 19 for an uninterruptible power system 17 are turned ON, OFF respectively and power stored in the battery 15 is fed to the uninterruptible load 20. Reverse power flow from the battery 15 to the main system 1 is prevented through operation of a reverse power flow detector 5 which causes interruption of a main system inlet circuit breaker 4 and instantaneous interruption of the main system. |
