Civil Engineering Reference
In-Depth Information
FIGURE 13-4
Electrical component layout of the grid-connected wind power system. (Source: AWEA/IEA/
CADDET Technicla Brochure, 1995.)
FIGURE 13-5
Electrical schematic of the grid-connected variable speed wind power system.
Large wind systems being installed now tend to have the variable-speed
design. The power schematic of such a system is shown in
Figure 13-5
.
The
variable-frequency generator output is first rectified into DC, and then
inverted into a fixed-frequency AC. Before the inversion, the rectifier har-
monics are filtered out from the DC by the inductor and capacitors. The
frequency reference for the inverter firing and the voltage reference for the
rectifier phase-angle control are taken from the grid lines. The optimum
reference value of the tip-speed ratio is stored and continuously compared
