University of South Wales Master of Sciences Thesis

Fig. 3.3: The power output from a wind turbine and a PV Array. From Figure 4-3, it can be seen that about 94KW

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Standalone Hybrid Power Generation Syste

3.3. Preliminary Sizing of System Elements

Fig. 3.3: The power output from a wind turbine and a PV Array.
From Figure 4-3, it can be seen that about 94KW and 295 KW maximum powers could be obtained
from a solar and a wind turbine respectively.
Based on the output power of the PV-panel and the wind turbine, the energy that can be obtained from
the RESs at any time can be observed. Comparing the power output profiles with the power demand
profile, the following important points can be noted.
•
The data used in this study are hourly average, which is useful for unit sizing. Since the wind-
generated power is proportional with the cube of wind speed, more power could be produced
at times when there are spikes in the wind speed, which are not actually shown here.
•
The load demands are high load at daytime‟ and high load nighttime‟ for load profile-A and
profile-B respectively. The resource data doesn’t show times when no wind or solar powers
are available. Hence, an energy storage device is required to store the energy when supply is
greater than the demand.
•
There is a need for sizing of the battery bank such that it is capable of storing enough energy
from the RESs and meeting the daily load demand at times when there are no supplies from
other sources (worst case). It should also have a capacity to store the energy from the

Standalone hybrid generation system for the remote area of Thar, Pakistan

resources when there is no load and/or small load. Therefore, increased storage capacity may
be needed to ensure the availability of power during such times.
3.3. Preliminary Sizing of System Elements
By considering each system elements independently, the preliminary sizes of the PV-arrays, Wind
turbine, Battery bank and power converters are discussed in the next sections.

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