Dynamic
Modeling and Simulation of Hybrid Power
Systems
Based on Renewable Energy
ABSTRACT:
This paper describes dynamic modeling and simulation
results of a renewable energy based hybrid power system. The paper focuses on
the combination of solar cell (SC), wind turbine (WT), fuel cell (FC) and
ultra-capacitor (UC) systems for power generation. As the wind turbine output
power varies with the wind speed and the solar cell output power varies with
both the ambient temperature and radiation, a FC system with an UC bank can be
integrated to ensure that the system performs under all conditions. Excess wind
and solar energies when available are converted to hydrogen using an
electrolyzer for later use in the fuel cell. Dynamic modeling of various components
of this isolated system is presented. Transient responses of the system to step
changes in the load, ambient temperature, radiation, and wind speed in a number
of possible situations are studied.
KEYWORDS:
1. Fuel cell
2. Hybrid power system
3. Renewable energy
4. Solar cell
5. Ultra-capacitor
6. Wind turbine
SOFTWARE: MATLAB/SIMULINK
BLOCK
DIAGRAM:
Figure 1. Renewable energy based hybrid power system model in Simulink.
CONCLUSION:
In
this paper, a novel renewable energy based hybrid power system is proposed and
modeled for a stand-alone user with appropriate power controllers. The
available power from the renewable energy sources is highly dependent on environmental
conditions such as wind speed, radiation, and ambient temperature. To overcome
this deficiency of the solar cell and wind system, we integrated them with the
FC/UC system using a novel topology. The voltage variation at the output is
found to be within the acceptable range. The output fluctuations of the wind
turbine varying with wind speed and the solar cell varying with both
environmental temperature and sun radiation are reduced using a fuel cell.
Therefore, this system can tolerate the rapid changes in load and environmental
conditions, and suppress the effects of these fluctuations on the equipment
side voltage. The proposed system can be used for off-grid power generation in
non interconnected areas or remote isolated communities.
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