Reduction in energy consumption and noise pollution at the Munich airport. Operators are equipping all boarding bridges near the buildings with modern ventilation systems for parked airplanes to accomplish this goal. Active filters from MR play an important role in making this a reality. The filters ensure that the airport's power supply does not fall off balance due to the current harmonics caused by environmentally-friendly air-conditioning systems.

The "Franz Josef Strauß" airport is just under 25 miles (40 kilometers) from the gates of Munich and serves 380,000 departures and landings, 41 million passengers, and more than 337,000 tons of shipped freight, according to the airport's records for 2015. Signs are pointing to growth and the operators are looking towards realizing a CO2 neutral design by 2020. The new pre-conditioned air systems are the most important tool for making this a reality. They provide air-conditioning to waiting airplanes in the form of temperature-controlled fresh air without the auxiliary power units of the airplanes needing to run, as was previously the case. This does an impressive job of cutting down the environmental impact—the drop in kerosene consumption means a reduction of yearly carbon dioxide emissions by 23,500 tons.

In the past, airplanes waiting at the boarding bridges at the Munich airport had to provide air-conditioning themselves. They operated their own auxiliary power units to supply this air. These units burn kerosene, expel large amounts of carbon dioxide and are very noisy. Now, the airport operators are changing course. By mid-year, 64 stationary, environmentally compatible systems are going into operation to supply heat and cooling to docked aircraft, eliminating the need to run the auxiliary power units. The new pre-conditioned air systems can filter and condense outside air directly at the parked position near the building, heating or cooling it depending on what is needed. The processed air then travels into the aircraft cabin through an insulated hose.

A significant component of the PCA systems are the air handling units (AHU), each of which has three drives.  Six-pulse frequency converters regulate their speed. These converters cause current harmonics, which, left unfiltered, would jeopardize the safety of other electronic components. GRIDCON® ACF active filters from MR solve the problem. Modularly designed filters have been adapted to the respective AHU power rating classes and are mostly kept in outdoor air-conditioned housing units designed specifically for this purpose. The MR active filters maintain the voltage quality throughout the airport power grid and ensure an error-free power supply at all points of consumption.

With this solution, the MR experts in the area of Power Quality beat out well-known competitors in a complex bidding process. Their precisely calculated, cost-effective filter design and their impressive service concept were very well received. Regular operation of the first PCA system began in 2014, only a few days after the contract was granted. After a one-week test run, the German Technical Inspection Association (TÜV) confirmed that compliance with all rigorous limit values had been consistently achieved.

GRIDCON® ACF MR active filters take the strain off the power grid, extend the service life of equipment, and improve the safety of industrial facilities. Where current harmonics develop, complex control methods generate current which counteracts the distorted load current and supplements the grid power to become a pure sinusoidal curve. The interfering current harmonics are eliminated and the voltage quality is improved considerably.

Download flyer for industrial version of the Gridcon® ACF