Latest Studies

  • 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.

  • Rubrik: Datum: Title: Network Driven Demand Side Management

    Photovoltaic energy deployment is paving the way for deep changes in the way electricity is produced and the grid is managed. While multi megawatts power plants and High Voltage power system remain the main drivers for balancing production and consumption, we see now the emergence of production of electricity and storage systems at Low Voltage level. This leads to new opportunities and challenges for active power balance and power system management. Demand Side Management is identified as a major opportunity and in this report the title “Network Driven Demand Side Management” has been chosen to emphasize a collaborative approach between decentral generation, loads, storage systems and the grid.

  • Rubrik: Datum: Title: Improving Efficiency of PV Systems Using Statistical Performance Monitoring

    Availability, high efficiency and therefore fault detection are of equal importance to the PV system owner and the grid manager for utility‐grade PV and increasingly for the small residential array. With increasing penetration of small arrays, large neighborhoods aggregate to virtual megawatt power stations, creating an amorphous and unpredictable power‐producing entity.