TECHNOLOGY LEADERS System Utility Grid 11 March 12 March 13 March 14 March 14:47 Grid Outage Outage Grid Connection Voltage Collapse Disconnect Stop Grid Recovery Grid Connection Around 12:00 Islanding Operation Islanding Operation Gas Engine Grid Connection dc Supply Grid Connection Supply from Battery Grid Connection Supply from Gas Engine Grid Connection Grid Connection 02:05 Stopped Manually Battery Outage Supply from Gas Engine Grid Connection B1 Quality Grid Connection Battery B3 Quality Grid Connection C Quality Grid Connection A Quality Outage Outage Outage Supply from Gas Engine Around 14:00 Dispatch Start (Customer's Requst) Supply from Gas Engine Grid Connection Grid Connection Supply from Gas Engine Grid Connection Figure 9. The power supply conditions during an outage caused by an earthquake on 11 March 2011. NEDO Project NEDO Microgrid-EMS Controlling Charge and Discharge Price Signal Monitoring PV Output PV System 1 MW Battery NaS 1 MW Lead-Acid 0.8 MW NEDO House HEMS (Home Energy Management System), PV (3.4kW), Battery (24 kWh), Thermal Storage, Smart Appliances Power Flow Monitoring at the Border of Microgrid Price Signal Price Signal Substation Price Signal Small Com. Building PV System 1 MW (U.S. Side) Figure 10. The demonstration system in Los Alamos, New Mexico. 8 I E E E E l e c t r i f i c ati o n M agaz ine / SEPTEMBER 2015 Residential Houses (with Smart Meter)