05-04-2012, 03:51 PM
Combining the Wind Power Generation System with Energy Storage Equipments
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INTRODUCTION
wind energy is a source of renewable power which comes
from air current flowing across the earth's surface.
Wind turbines harvest this kinetic energy and convert it into
power. The electricity is sent through transmission and
distribution lines to customers. Wind generation is one of the
fastest growing sources of electricity and one of the fastest
growing markets in the world today.
Advantages
Wind power is the most mature and cost effective
renewable energy technologies available today, costing
between 3 and 5 cents per kilowatt-hour, depending upon the
wind resource and financing of the particular project. It is
competitive with traditional power plants. Unlike electricity
from fossil fuel powered sources which depends on fuels
whose prices are costly and may vary considerably, the cost of
wind power is relative stable.
Disadvantages
Good wind sites are often located in remote area, it may
require significant infrastructure improvement to deliver the
wind power to the load center.
Although wind power plants have relatively little impact on
the environment compared to other conventional power plants,
there is some concern over the noise, aesthetic (visual)
impacts, and sometimes birds have been killed by flying into
the rotor blades. Most of these problems have been resolved or
greatly reduced through technological improvement or by
properly siting wind plants [1].
STORAGE CAPACITY ESTIMATE RESULTS
The estimated results are shown in Figure 6 to 17. These
figures show the different storage time, power rating, and
storage capacity requirements. Blue line is wind power
without storage device. Green area is the estimated output
with desired storage capacity. From the results, one can see
different storage time requires different storage capacity and
power rating. One of the most important factors is the quality
of the wind. The larger variation of wind speed will increase
the power and storage capacity.
SIMULATION RESULT DURING WIND GUST
When wind gust occurs in wind farm, system power flow,
generator angel, voltage and frequency will fluctuate. In this
section, we simulate combining the wind turbine with energy
storage equipments during a short wind gust in study case to
mitigate the negative affect of power system fluctuation [10].
In this study case, the wind farm consists of a large number of
wind turbine generators in a large area and we assume that the
configuration of energy storage is connected to wind collector
bus.
CONCLUSION
With an average annual growth rate of more than 26 %
since 1990, wind is the fastest growing energy source in the
world [11]. Based on information from studies and operational
experiences, the report of European Wind Energy Association
(EWEA) concludes that it is perfectly feasible to integrate the
targeted wind power capacity of 300GW in 2030 in US –
corresponding to an average penetration level of up to 20%
[12, 13]. For high penetration levels of wind power,
optimization of the integrated system should be explored.