In order to install Wind Turbine, 3 MW, the technical analysis shows that at rated wind power the current injected to the point of common coupling equals (90 ∠-17° A) and the voltage at PCC equals (33 ∠3° KV). If the technical requirement for connecting WT is (±0.95 Power Factor).
a) Is it acceptable to connect the WT? Why?
b) What kind of compensation is required and calculate the required capacity (VAR)
-A small commercial building uses 150 MWh / month, and it is contracted in the demand tariff with Demand Charge (SAR 100 /KW – month) and (0.20 SAR/kWh).
If this facility has a peak demand of [100*(d1+d2+d4+d5)] kW, calculate;
a) The monthly bill ignoring the fixed customer charges.
b) The electricity cost in SAR / kWh for an 80 W computer being used 8 hours per day for 25
days per month.
c) A small 50 kW, 15 m diameter wind turbine is installed above the roof of the commercial
building. If Rayleigh wind distribution and average wind speed of (d1+d2+d5) m/s in this location, calculate the new bill after consider the wind energy with Levelized cost of 0.08 SAR/KWh (assuming peak demand and rated wind power will occur at same time)
Sample Solution