50.3 0.8 0.6 Power Injection to Support Low Frequency 50.2 50.1 0.2 50 0 -0.2 49.9 -0.4 Frequency (Hz) FCAS Response (MW) 0.4 49.8 -0.6 Power Draw to Suppress High Frequency -0.8 49.7 1:30 p.m. 1:35 p.m. 1:40 p.m. 1:45 p.m. 1:50 p.m. 1:55 p.m. 2:00 p.m. 2:05 p.m. 2:10 p.m. 2:15 p.m. Average Frequency per Site (Hz) VPP Frequency Response (MW) 49.85 and 50.15 Hz figure 18. The FCAS response for South Australia's VPPs on 10 December 2019, with Victoria and South Australia regional separation. For further details, please refer to "Virtual Power Plant Demonstration: Knowledge Sharing Report No. 1" in the "For Further Reading" section. 3 300 2 200 1 100 0 0 -1 -100 -2 Price (AUS$/MWh) Power (MW) Battery Discharging During Periods of Elevated Energy Prices -200 Aggregate Battery Power (MW) 15 January 2020 14 January 2020 13 January 2020 12 January 2020 11 January 2020 10 January 2020 -3 9 January 2020 Battery Precharging in Anticipation of Elevated Energy Prices -300 Price (AUS$/MWh) figure 19. The energy response for South Australia's VPPs on 9-15 January 2020, showing behavior during one week and the price-versus-battery dispatch. For further details, please refer to "Virtual Power Plant Demonstration: Knowledge Sharing Report No. 1" in the "For Further Reading" section. november/december 2020 ieee power & energy magazine 35