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BLACKOUT SOLVE

THE INNOVATION OF ENERGY

Linking clean energy sources solves blackout

conundrum

Critics of renewables have always claimed that sun and wind are only intermittent

producers of electricity and need fossil fuel plants as back-up to make them viable. But

German engineers have proved this is not so.

By skilfully combining the output of a number of solar, wind and biogas plants the grid can be

provided with stable energy 24 hours a day without fear of blackouts, according to the

Fraunhofer Institute for Wind Energy and Energy System Technology (IWES) in Kassel.

For Germany, which has turned its back on nuclear power and is investing heavily in all forms of

renewables to reduce its carbon dioxide emissions, this is an important breakthrough.

Germany is developing its renewable energy resources. Siemens has produced the worlds

largest wind turbine (pictured) which has a 154m diameter (Source: Siemens)

The country has a demanding industrial sector that needs a large and stable electricity supply,

and some doubted that this could be achieved in the long term without retaining nuclear or largefossil fuel plants.

http://www.rtcc.org/files/2013/04/Siemens75mBlade-source-siemens-466px.jpg

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Solving the problem is becoming urgent. The latest figures show that on some days of the year

the electricity being generated from sun, wind, biomass, water and geothermal production

already accounts for more than half of the load required in the country.

The research is funded by the German Federal Ministry of the Environment and is aimed at

showing that the entire electricity grid could be run on renewable energy.

Dr. Kurt Rohrig, deputy director of IWES, said: Each source of energy be it wind, sun or

biogashas its strengths and weaknesses. If we manage to skilfully combine the differentcharacteristics of the regenerative energies, we can ensure the power supply for Germany.

The idea is that many small power plant operators can feed their electricity into the grid but act

as a single power plant using computers to control the level of power.

Sharing the load

Scientists linked together 25 plants with a nominal power output of 120 megawatts. Surpluspower could be used for charging electric vehicles and for pumped storage (pumping wateruphill into a reservoir to produce hydropower later).

When many small producers work together, then regional differences when the wind blows or

the sun is intermittent are balanced out in the grid and can be boosted by controllable biogas

facilities.

If there is too much surplus energy then the power can also be used to create and store thermalenergy to be used later.

Kasper Knorr, the project manager for the scheme, which is known as the Combined PowerPlant2 research project, says the idea is to ensure that the consumer is supplied reliably with 230volts at a frequency of 50 Hertz.

The current system of supplying the grid with electricity is geared to a few large producers. Inthe new system, with dozens of small producers, there will need to be extra facilities at intervals

on the system to stabilize voltage. Part of the project is designed to find out how many of these

the country will need.

The project has the backing of Germanys large and increasingly important renewable companies

and industrial giants like Siemans. Researchers will be demonstrating the system at the Hanover

Trade Fair from April 8 to 13.

HOW BLACKOUT WORK

You may remember the blackout that occurred on Aug. 14, 2003. It was the biggest in U.S.

history. And just like every major blackout, it raised a lot of questions about how the power-

distribution system works.

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At a high level, thepower gridis a very simple thing. It consists of a set of large power plants

(hydropower plants,nuclear power plants, etc.) all connected together by wires. One grid can be

as big as half of theUnited States. (SeeHow Power Distribution Grids Workto learn about thedifferent pieces of the grid.)

A grid works very well as a power-distribution system because it allows a lot of sharing. If apower company needs to take a power plant or a transmission tower off line for maintenance, the

other parts of the grid can pick up the slack.

The thing that is so amazing about the power grid is that it cannot store any power anywhere in

the system. At any moment, you have millions of customers consuming megawatts of power. At

that same moment, you have dozens of power plants producing exactly the right amount ofpower to satisfy all of that demand. And you have all the transmission and distribution lines

sending the power from the power plants to the consumers.

This system works great, and it can be highly reliable for years at a time. However, there can be

times, particularly when there is high demand, that the interconnected nature of the grid makesthe entire system vulnerable to collapse. In this article, we'll find out what happens to cause a

blackout and see what steps you can take to prepare yourself for an extended power outage.

Source :http://science.howstuffworks.com/environmental/energy/blackout.htm

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