Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

A World Record in Direct Current Transmission

02.05.2011
Siemens is building power converter stations for a high-voltage direct current (HVDC) transmission system with a record capacity of 2 x 1,000 megawatts.

Beginning in 2013 the new HVDC PLUS technology will transmit 2,000 megawatts (MW) as direct current over a distance of 65 kilometers underground. This system, which is being partially funded by the EU, connects the French and Spanish grids between Baixas and Santa Llogaia. At present the two countries’ grids are linked only by low-capacity lines.


Power grids will have to be substantially upgraded throughout Europe before more renewable energy can be used. The Desertec power generation project, in particular, will require high-performance electricity highways. Alternating current is commonly used for overhead lines, but it isn’t suitable for transmitting high capacities over long distances underwater or underground. In non-overhead systems, losses would be very high due to the charging and discharging of the cable capacities. In an HVDC system, on the other hand, transmission losses are 30 to 40 percent lower than in a comparable three-phase alternating current transmission line.

By 2013, developers at Siemens Energy will have constructed a system that can transmit 1,000 MW through each of two cables. The power will be transmitted at the highest voltage possible for today’s cables: +/-320 kilovolts. The new HVDC PLUS power converter stations use VSC-MMC technology, which is not only more flexible and robust than today’s systems, but also less prone to faults. At the heart of the new system is a converter that uses insulated gate bipolar transistors (IGBTs), which are semiconductor devices that convert alternating current into direct current and vice-versa. The system is very flexible since IGBTs can be switched at any time, no matter how high the voltage. A reactive power exchange is possible between each power converter and the three-phase alternating current network, which helps to stabilize overloaded grids. In addition, MMC technology causes few high-frequency faults, which diminish voltage quality. So there is no need for high frequency filters. The system also has a black start capability, which means the grid doesn’t require external assistance to gradually restart after a blackout. Another advantage of the system is that the energy converters don’t have to change their polarity if the direction of the transmission is reversed, thus reducing wear and tear.

A 1,000-MW HVDC cable was recently put into operation along a 260-kilometer underwater line between the Netherlands and the UK. HVDC systems are part of Siemens’ environmental portfolio, with which the company generated about €28 billion in sales in 2010.

Dr. Norbert Aschenbrenner | Siemens InnovationNews
Further information:
http://www.siemens.com/innovationnews

Further reports about: HVDC IGBTs Transmission semiconductor device

More articles from Power and Electrical Engineering:

nachricht New tech for commercial Lithium-ion batteries finds they can be charged 5 times fast
20.02.2018 | University of Warwick

nachricht In best circles: First integrated circuit from self-assembled polymer
19.02.2018 | Max-Planck-Institut für Polymerforschung

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: In best circles: First integrated circuit from self-assembled polymer

For the first time, a team of researchers at the Max-Planck Institute (MPI) for Polymer Research in Mainz, Germany, has succeeded in making an integrated circuit (IC) from just a monolayer of a semiconducting polymer via a bottom-up, self-assembly approach.

In the self-assembly process, the semiconducting polymer arranges itself into an ordered monolayer in a transistor. The transistors are binary switches used...

Im Focus: Demonstration of a single molecule piezoelectric effect

Breakthrough provides a new concept of the design of molecular motors, sensors and electricity generators at nanoscale

Researchers from the Institute of Organic Chemistry and Biochemistry of the CAS (IOCB Prague), Institute of Physics of the CAS (IP CAS) and Palacký University...

Im Focus: Hybrid optics bring color imaging using ultrathin metalenses into focus

For photographers and scientists, lenses are lifesavers. They reflect and refract light, making possible the imaging systems that drive discovery through the microscope and preserve history through cameras.

But today's glass-based lenses are bulky and resist miniaturization. Next-generation technologies, such as ultrathin cameras or tiny microscopes, require...

Im Focus: Stem cell divisions in the adult brain seen for the first time

Scientists from the University of Zurich have succeeded for the first time in tracking individual stem cells and their neuronal progeny over months within the intact adult brain. This study sheds light on how new neurons are produced throughout life.

The generation of new nerve cells was once thought to taper off at the end of embryonic development. However, recent research has shown that the adult brain...

Im Focus: Interference as a new method for cooling quantum devices

Theoretical physicists propose to use negative interference to control heat flow in quantum devices. Study published in Physical Review Letters

Quantum computer parts are sensitive and need to be cooled to very low temperatures. Their tiny size makes them particularly susceptible to a temperature...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

2nd International Conference on High Temperature Shape Memory Alloys (HTSMAs)

15.02.2018 | Event News

Aachen DC Grid Summit 2018

13.02.2018 | Event News

How Global Climate Policy Can Learn from the Energy Transition

12.02.2018 | Event News

 
Latest News

'Lipid asymmetry' plays key role in activating immune cells

20.02.2018 | Life Sciences

MRI technique differentiates benign breast lesions from malignancies

20.02.2018 | Medical Engineering

Major discovery in controlling quantum states of single atoms

20.02.2018 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>