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Energy 1 2 3 4 5 6 7 8 1 7 o'clock in the morning in Germany, Italy and in France. 2 Martin is having a shave. 3 Michelle is making fried eggs. 4 Tim and Laura are making their morning toast. 5 Maria is boiling water for a cup of tea. 6 Lara is switching the computer on. 7 Luigi is warming the kitchen with a fan heater. 8 Hans is making coffee. They are all using so much electricity that the power being produced by the big public power plants and the small private plants at this moment is simply not enough and the diesel powered plants have to supply peak-load power. 58 I MTU Report 03/12
MTU Onsite Energy electricity generators supply emergency, control and peak-load power Morning delivery The future of energy generation is localized and renewable. But that also changes the demands placed on the power grids. They will increasingly have to cope with larger, fluctuating amounts of energy from wind farms and solar arrays without allowing the grid voltage or frequency to drop out. To do so, they need flexible energy sources that the grid operators can call upon at short notice. The energy supplier ÜWAG in Fulda operates such an energy source. In recent years it has upgraded its power plant with custom-built diesel generators from MTU Onsite Energy and now supplies flexible emergency, control and peak-load power on the dot. What does Hans Müller in Germany do at 7 in the morning? He makes a cup of coffee. Luigi Motta in Italy uses a fan heater to warm up the kitchen. Michelle Potier in France cooks breakfest. They all enjoy the last few moments of calm before the sun rises. Silence reigns but the grid is starting to hum. Because right on the dot of 7 a.m., not only Hans Müller, Luigi Motta and Michelle Portier use electricity – millions of other people do too. The electricity being generated just at this moment by power plants both big and small is not enough to cover the demand. The grid is overloaded. Combined European grid delivers This is the moment for flexible power plants. Überlandwerk Fulda Aktiengesellschaft (ÜWAG for short) is one of them. It was built 100 years ago – originally to supply electricity to the citizens of Fulda. But nowadays there is a combined European power grid into which not only largescale power stations but an increasing number of smaller, localized energy plants feed their electricity. That power is distributed to the individual households and industrial facilities via a network of transformer stations and substations. ÜWAG in Fulda had to find itself a new place in that system – and succeeded in doing so. Power for demand peaks The plant supplies peak-load power when demand is so high that there is not sufficient capacity available in the combined grid. Just about the time when Hans Müller, Luigi Motta, Michelle Portier and millions of others switch on the lights or put on the kettle. “Between 7 and 8 in the morning and at about 8 in the evening demand for power rockets,” explained Frank Weinmann, head of the Energy Generation and Procurement department at ÜWAG. In the past, the demand peak occurred around midday, whereas now people use most electricity in the morning when they get up and when they get home in the evening. “The demand pattern gives you a good idea of how people’s lifestyles have changed,” he smiled. To be able to balance out the demand peaks more effectively in future, ÜWAG in Fulda has spent €10 million modernizing its power plant in recent years. Two old diesel engines were retired and replaced by six smaller generator sets supplied by MTU Onsite Energy. The key component of each genset is a 20-cylinder MTU Series 4000 engine. “I don’t know of any diesel power station in the world that is more modern than ours right now,” said Frank Weinmann looking down proudly from the control room onto the blue MTU Onsite Energy power modules. “Those engines are real Ferraris,” he enthused. They can start up and synchronize with the European power grid within a matter of a few seconds. The old engines would have needed several minutes to do so. Control power balances out grid fluctuations “In today’s power generation world you have to be fast,” he explained and he went on to point out that it is not just because demand peaks occur much more frequently nowadays. The constantly growing proportion of electricity from renewable sources is also a factor because, in contrast with conventional large-scale power plants, it is not possible to precisely predict how reliably they will supply energy to the grid. Put simply, When ÜWAG Fulda was built 100 years ago it was on the edge of the town. But the city has grown since then and now it is right in the middle of the urban area. Frank Weinmann is a qualified engineer and heads the Energy Generation and Procurement department.
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