New Hybrid UPS-Systems, Preferably for Larger Power Output

The hybrid UPS-systems have been developed by combining main elements of the so-called static UPS-systems with the synchronous motor drive preferably used in dynamic UPS-systems. Thus a system has been created which combines many advantages of both technologies. The advantage of dynamic UPS-systems in general and particularly at larger outputs is that no electric-chemical energy storage and - in many cases - no additional stand-by generating set is needed. At further rising outputs, however, kynetic energy storages - fly-wheels - have their economical and financial limits. Research work has been done with the aim to complete or replace the fly-wheel by hydro-static storages. The technical result as presented with this paper has been fully satisfying.