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ac system 28–34<br />
electricity supply 25–6<br />
phasor 30<br />
see also power, root mean square<br />
active power 29–30, 90<br />
see also power<br />
aggregation<br />
wind farm, benefits <strong>of</strong> 152–6<br />
wind forecasting 229–30<br />
air compression, storage 199–200<br />
cycle efficiency 200<br />
see also storage<br />
alternator: see synchronous machine<br />
ampere, definition <strong>of</strong> 23<br />
Ampère, law 22<br />
ancillary service<br />
electricity market 244–5<br />
wind turbine, provision by 180–7<br />
see also curtailment, integration, power<br />
system operation, spinning reserve<br />
angle <strong>of</strong> incidence/attack, turbine blade 60–3<br />
apparent power 34<br />
see also power<br />
atmosphere, structure <strong>and</strong> scale 211<br />
automatic generation control (AGC) 134–5,<br />
165<br />
auto-reclosing, circuit breaker 122<br />
AWPPS, forecasting tool 233–4<br />
balancing market 243–5<br />
battery, flow 199<br />
cycle efficiency 199<br />
see also storage<br />
battery, secondary 198–9<br />
cycle efficiency 198<br />
energy density 198<br />
Index<br />
lead-acid 198<br />
lithium ion 198–9<br />
lithium polymer 198–9<br />
power density 198<br />
sodium-nickel-chloride 198<br />
sodium-sulphur 198<br />
see also storage<br />
BETTA, UK 14, 243<br />
see also electricity market, gate closure,<br />
NETA<br />
Betz limit 57<br />
bilateral trading 243<br />
biogas 205<br />
biomass 205<br />
blackout, system 135–6<br />
system restoration 138–9<br />
see also emergency frequency control,<br />
load-frequency control<br />
blade, turbine 7–9, 56<br />
CFRP, use <strong>of</strong> 18<br />
diameter 1, 9<br />
tip-speed ratio 57–8<br />
capacitance 32–3<br />
power factor correction 69–72<br />
capacity credit 16, 146, 177–80<br />
electricity market 244<br />
loss <strong>of</strong> load expectation (LOLE) 178<br />
loss <strong>of</strong> load probability (LOLP) 178<br />
capacity factor 145–7<br />
carbon dioxide emissions<br />
carbon tax 245<br />
emissions trading 246<br />
natural gas generation, effect <strong>of</strong> 2<br />
savings, renewable energy 12–13<br />
coal-fired generation 13, 130
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