Friday, June 14, 2013

Solar–Wind Hybrid Power Plants Approximately Twice As Efficient

Solar–Wind Hybrid Power Plants Approximately Twice As Efficient

May 1, 2013 | Tim Tyler

A new study by the Reiner Lemoine Institut and Solarpraxis AG has found that solar and wind power generation complement each other better than previously thought.

The study examined the surface area where solar photovoltaic systems and wind turbines were installed together. In that same surface area, twice the amount of electricity was being generated, and the shading produced by the wind turbines accounted for a mere 1 to 2% loss in the photovoltaic system — which is much less than previously thought would be the case.

One of the strong benefits is the construction of these types of power plants do not require grid expansion since the plants generate wind and solar power at different intervals and during complementary seasons. This helps ensure that the level of energy being fed into the grid is more steady than that of wind or photovoltaic power plants alone.

“Until now, it was thought that the shadows cast on solar plants by wind turbines led to high yield losses. The study shows, however, that these shading losses are much lower than expected, provided the hybrid power plant is well designed,” said Alexander Woitas, head of the engineering department at Solarpraxis AG, parent company of

In the study, they also calculated what effects combining photovoltaic and wind power plants will have on power grids on both a global and regional level.

The bottom line is: solar power plants generate more solar power in the summer, while wind turbines generally produce a lot more electricity during the colder parts of the year — this balances out the overall supply to the grid and keeps it more stable throughout the year.

Comment by Anumakonda Jagadeesh

Good option to compliment solar and wind. Solar gadgets work in day time and wind in day and night also depending on the site.

Grid connected converters are required to transfer harvested green energy from wind and solar systems into the main grid. The importance of the single-phase grid connection for PV and wind power systems should not be underestimated. It is one of the key components when it comes to stable, and efficient power transfer from the solar or wind power system into the grid. Not only grid-synchronization, also EMI problems, harmonic regulations and efficiency are important design issues that have to be solved.

Although it looks fairly simple at first sight, the transfer of DC power from the solar or wind power system to the grid can be categorized into various solutions. Depending on the size of the PV-system and the
arrangement of the solar panels, the following combination of solar panels is possible:

Solar Panel:

Parallel and series connected solar cells.

Solar Module:

Parallel and series connected solar cells including bypass


Solar Array:

Parallel and series connection of solar modules.

Solar string:

Series connection of solar panels.

Solar Multi String:

Parallel connection of solar strings

The PV inverters are categorized depending on the PV power

plant configuration.

50 – 500Watt:

Here mostly one solar panel is used where the inverter is

integrated into the solar module. Typically used for feeding

on remote locations of Measurement Stations or traffic


500Watt – 2kW:

For small rooftop plants, one solar string is used.

1.5kW – 6kW:

Larger rooftop plants are configured either as solar string

solar Multi String.

6kW – 100kW:

Three-phase grid connection is applied here with solar multi

string or arrays.

> 100kW:

Three phase grid connection and central configured grid


One more limitation for wind/solar vertical system which
will be rotating. The incidence of solar light won’t be constant on a rotating surface.

Infact Hybrid systems like Wind-solar,Wind Diesel,
Solar-Diesel were tried in the past. Due to economics of power
generation,maintenance,synchronization etc. these could not be popular.

I’d put my money on the sun and solar energy. What a source of power! I hope we don’t have to wait until oil and coal run out before we tackle that.

– Thomas Alva Edison, 1931

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