Latest Studies

  • Rubrik: Datum: Title: Premium modules: Players in the top league

    Premium modules are in the champions’ league when it comes to performance and reliability. SUN & WIND ENERGY has surveyed selected players in this top flight about their latest products – and their estimation of the market for these innovations.

  • Rubrik: Datum: Title: China Renewable Energy Outlook 2017

    China has started the transformation from a coal-based energy system with high environmental costs to a low-carbon and environmentally friendly energy system. Our analyses show that the right strategy for policy measures are on the table, but the success of the energy transition depends on strong practical use of these strategies – the power market must be enforced in a way that stimulate flexibility and integration of RE, the carbon pricing mechanisms must ensure sufficiently high carbon prices to make an impact on CO2 emission and the support schemes for RE must stimulate costefficient deployment of RE projects. Also, more ambitious targets for RE and for coal reduction are needed in the short run if China shall be able to comply with the Paris agreements requirements for a “well Below 2 °C” future.

  • Rubrik: Datum: Title: High renewable future in the UK and Germany to create new power systems flexibility challenge

    Economic tipping points mean renewable energy will account for over half of electricity generation by the mid-2020s in the UK and Germany. This comes as the cost of generating energy from wind and solar is expected to more than halve from today’s levels by 2040.

  • Rubrik: Datum: Title: Wind Turbines: An eye on the technical management

    The technical management is responsible for the smooth technical operation of a wind farm. As the tasks become more complex, however, the cost pressures rise as well.

  • Rubrik: Datum: Title: Off-grid systems: Solar energy replaces fossil fuels

    A mountain lodge, a remote part of the country or maybe a comfortable mobile home - sometimes it is difficult or even impossible to connect to the public electrical grid. Then, this is the time for off-grid systems capable of operating independently. The german company enerquinn Energiesystemtechnik GmbH is an experienced full service partner for off-grid systems. In addition to the individually optimized planning and concept design of off-grid PV systems, they also take care of installation, commissioning and training of the operators or their customers.

  • Rubrik: Datum: Title: EU must cut emissions and also adapt to climate change, warn Auditors

    Effective action on energy is essential to tackle climate change, according to a new landscape review of EU Action on Energy and Climate Change published by the European Court of Auditors. Energy production and use account for 79% of EU greenhouse gas emissions, say the auditors. Even if efforts to cut greenhouse gas emissions are successful, adapting to changes in the climate is necessary. By the end of the century, Europe’s climate will be significantly different even under the temperature increase of no more than 2°C envisaged by the 2015 Paris agreement.

  • Rubrik: Datum: Title: 5-level topology – the next logical step for inverters

    Inverters work on the principle of switching between different levels of DC voltage. The output is thus not an ideal sine-shaped AC wave, but rather a pattern of rectangular pulses that are made to resemble the sine wave as accurately as possible by switching between specified at high frequency. Therefore, the ability to approximate an exact sine wave with rectangular pulses is restricted by the number of available voltage levels: the higher the number, the closer the approximation to the ideal sine shape. The non-ideal sine shape causes harmonics (currents and voltages at higher frequencies). Harmonic filters can be used to smooth the output by absorbing problematic harmonics, but these filters are both a cost factor and a cause of additional losses in energy conversion.

  • Rubrik: Datum: Title: Staggering growth in consumer demand for green power

    Most Europeans can choose who they buy their power from and current market data shows exactly what consumers want: "European households and businesses continue to show they are dead serious about the renewable energy transition," says Tom Lindberg, Managing Director in ECOHZ

  • Rubrik: Datum: Title: Heat transfer fluids: Safe through the winter

    Heat transfer fluids with frost protection are an important component in solar power systems and geothermal heat pump systems. Temperature resistance plays a major role for solar power systems, and for heat pumps, the potential water hazard from leaks is just as important.
    SW&E spoke to Emma Bardolph from Climalife about heat transfer fluids for solar thermal.

  • Rubrik: Datum: Title: Do it Locally: Local Voltage Support by distributed Generation

    This report by the IEA Photovoltaic Power System Programme presents an overview of research results and field experiences on the subject of local voltage support by distributed generators (DGs). The focus of this report is the German power supply system, which has experienced a significant photovoltaic (PV) expansion of approximately 36 GW within the last decade. Case study results from different countries like Belgium, Austria and the United States complement the findings on local voltage support by PV systems. A major PV integration challenge is the voltage regulation in distribution grids with a high PV penetration. Advanced PV inverter functions, like reactive power control or active power curtailment, can help to reduce the impact of PV feed-in on the local voltage magnitude. Nowadays, several countries demand reactive power and partly active power control capabilities from DGs in their grid codes and DG interconnection guidelines. Central control (coordinated control) approaches by DGs are not in the scope of this report.