recent years, it can be witnessed a rapid development of
renewable energy, e.g. wind power, photovoltaic (PV), etc.
throughout the world. The main motivations behind this fastgrowing
development are the rising environmental concerns,
i.e. greenhouse gas emission, and carbon footprint reduction,
and the increase in the fuel cost used for the electricity
production. For instance, by 2002, worldwide production of
photovoltaic had approached 600 MW per year and increased
by over 40% per year [1]. Japanese government also set out a
target to install the PV systems of 53 GW by 2030. Unlike
other distributed electricity generation alternatives such as fuel
cells and micro-turbines, PV completely does not need a
strong tall tower, produces no vibration or noise, and needs no
cooling. Therefore, certain characteristics make the PV
generation worthwhile to be considered in planning and
operation of the present and future electricity network. In
addition, these benefits can be maximized if the PV system is
located at or close to the electricity consumption points, e.g. in
urban areas. The PV modules can also become a part of
building whereas wind power and other types of renewable
energy based generation canno