《WIND TURBINE CONNECTED TO THE ELECTRICAL NETWORK》Dr. Gary L. Johnson 2001.11

myleader

Only a few hardy people in the United States live where 60 Hz utility power is not readily
available. The rest of us have grown accustomed to this type of power. The utility supplies
us reliable power when we need it, and also maintains the transmission and distribution lines
and the other equipment necessary to supply us power. The economies of scale, diversity of
loads, and other advantages make it most desirable for us to remain connected to the utility
lines. The utility is expected to provide high quality electrical power, with the frequency at
60 Hz and the harmonics held to a low level. If the utility uses wind turbines for a part of its
generation, the output power of these turbines must have the same high quality when it enters
the utility lines. There are a number of methods of producing this synchronous power from a
wind turbine and coupling it into the power network. Several of these will be considered in
this chapter.
Many applications do not require such high quality electricity. Space heating, water heating,
and many motor loads can be operated quite satisfactorily from dc or variable frequency
ac. Such lower quality power may be produced with a less expensive wind turbine so that the
unit cost of electrical energy may be lower. The features of such machines will be examined
in the next chapter.

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