The three-phase transformerless inverters with graded power outputs of 500, 1000, 1500, and 2000 kilowatts achieve an efficiency level of 98.4 percent. The version with two megawatts is the most powerful transformerless device currently on the market. The top efficiency of the new Siemens inverters enables plant operators to realize a high yield when feeding into the medium-voltage grid, for instance in the case of ground-mounted PV systems and systems mounted on large roofs.
The new compact Sinvert PVS central inverters are also available in photovoltaic containers, complete with medium-voltage components. These inverters will be presented for the first time at Intersolar Europe in Munich on Siemens' booth B4.310. The efficiency level, which is 0.2 percent higher than that of comparable products, enables a considerably higher yield to be achieved throughout the operating period of a photovoltaic system. With the master/slave technique it is possible not only to increase plant availability, but also to attain a longer plant service life. Furthermore, the efficiency level is higher than that of a stand-alone system, as the inverters can be switched in and out as required, depending on solar radiation. The efficiency of the solar plant can thus be optimized, particularly in the case of partial-load operation: the plant starts up even at low solar radiation, and reaches very high efficiency levels even in the lower performance range. As the inverter sub-unit with the fewest operating hours is always controlled as the master, this enables the operating time to be evenly distributed between the inverters, which will prolong the service life of the plant.
The new Sinvert PVS inverter series can be easily integrated into Scada systems through standardized communication interfaces. A pixel-graphics display with touch screen enables user-friendly local operation of the inverters and visualization of the performance data. The new devices comply with the medium-voltage guidelines of the German Association of Energy and Water Industries with all requirements including FRT (Fault Ride Through) and active power control.
The Siemens Industry Sector (Erlangen, Germany) is the worldwide leading supplier of environmentally friendly production, transportation, building and lighting technologies. With integrated automation technologies and comprehensive industry-specific solutions, Siemens increases the productivity, efficiency and flexibility of its customers in the fields of industry and infrastructure. The Sector consists of six divisions: Building Technologies, Drive Technologies, Industry Automation, Industry Solutions, Mobility and Osram. With around 207,000 employees worldwide (September 30), Siemens Industry achieved in fiscal year 2009 total sales of approximately €35 billion.The Siemens Industry Automation Division (Nuremberg, Germany) is a worldwide leader in the fields of automation systems, industrial controls and industrial software. Its portfolio ranges from standard products for the manufacturing and process industries to solutions for whole industrial sectors that encompass the automation of entire automobile production facilities and chemical plants. As a leading software supplier, Industry Automation optimizes the entire value added chain of manufacturers – from product design and development to production, sales and a wide range of maintenance services. With around 39,000 employees worldwide (September 30), Siemens Industry Automation achieved sales of €7.0 billion in fiscal year 2009.
Scientists create biodegradable, paper-based biobatteries
08.08.2018 | Binghamton University
Ricocheting radio waves monitor the tiniest movements in a room
07.08.2018 | Duke University
Scientists develop first tool to use machine learning methods to compute flow around interactively designable 3D objects. Tool will be presented at this year’s prestigious SIGGRAPH conference.
When engineers or designers want to test the aerodynamic properties of the newly designed shape of a car, airplane, or other object, they would normally model...
Researchers from TU Graz and their industry partners have unveiled a world first: the prototype of a robot-controlled, high-speed combined charging system (CCS) for electric vehicles that enables series charging of cars in various parking positions.
Global demand for electric vehicles is forecast to rise sharply: by 2025, the number of new vehicle registrations is expected to reach 25 million per year....
Proteins must be folded correctly to fulfill their molecular functions in cells. Molecular assistants called chaperones help proteins exploit their inbuilt folding potential and reach the correct three-dimensional structure. Researchers at the Max Planck Institute of Biochemistry (MPIB) have demonstrated that actin, the most abundant protein in higher developed cells, does not have the inbuilt potential to fold and instead requires special assistance to fold into its active state. The chaperone TRiC uses a previously undescribed mechanism to perform actin folding. The study was recently published in the journal Cell.
Actin is the most abundant protein in highly developed cells and has diverse functions in processes like cell stabilization, cell division and muscle...
Scientists have discovered that the electrical resistance of a copper-oxide compound depends on the magnetic field in a very unusual way -- a finding that could help direct the search for materials that can perfectly conduct electricity at room temperatur
What happens when really powerful magnets--capable of producing magnetic fields nearly two million times stronger than Earth's--are applied to materials that...
The quality of materials often depends on the manufacturing process. In casting and welding, for example, the rate at which melts solidify and the resulting microstructure of the alloy is important. With metallic foams as well, it depends on exactly how the foaming process takes place. To understand these processes fully requires fast sensing capability. The fastest 3D tomographic images to date have now been achieved at the BESSY II X-ray source operated by the Helmholtz-Zentrum Berlin.
Dr. Francisco Garcia-Moreno and his team have designed a turntable that rotates ultra-stably about its axis at a constant rotational speed. This really depends...
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14.08.2018 | Life Sciences