A Technical Description of a Variable Speed Generator System for retrofitting RTG Cranes NonSynchronous Energy Electronics, LLC 94 Middlesex Rd. Merrimack, NH 03054 USA 1 (603) 5465785 www.nonsynchronous.com Existing RTG Electrical System NonSynchronous Energy Electronics Engine Generator Set A fuel saving Variable Speed Generator System can be incorporated into existing RTG Cranes Aux. Loads For Existing Generator Sets, the engine speed can only be governed from 47Hz to 63Hz, with an idle speed of between 750 RPM and 900 RPM The NSEE System makes use of the idle/running toggle with trim signals to optimize performance For a 50Hz system such a Detroit Series 60 Engine, a further improvement in peak power of about 60kW can be incorporated for heavy lifts M M M M M Trolley Hoist M M Gantry RTG with VSG and Bypass Switchgear NonSynchronous Energy Electronics Engine Generator Set Aux. Loads DC Boost Control (+) () The VSG System is added, without removing any of the existing equipment. M M M M The Bypass Switchgear can be used to switch back to the original mode of fixed generator speed operation M Trolley Hoist M M Gantry The Engine and Alternator controls have a similar bypass mode to change when the power switchgear changes RTG with VSG System, Energy Storage and Bypass Switchgear NonSynchronous Energy Electronics Engine Generator Set Aux. Loads The Energy Storage System is added directly to the DC Link Battery M M M M M Trolley Hoist M M Gantry RTG with Smaller Generator, VSG , Energy Storage and NO Bypass Switchgear NonSynchronous Energy Electronics Engine Smaller Generator Set Aux. Loads Once the System is proven and accepted, the bypass can be removed and a smaller generator put in place for maximum fuel savings Battery M M M M M Trolley Hoist M M Gantry NonSynchronous Energy Electronics VSG – Generator control interface diagram Toggle idle/rated Speed Speed Trim V fb AVR PMG Field Current Controller Field Current Supply VSG Throttle Control Speed fb Field Engine Generator Set Example of similar Power Converters; NonSynchronous Energy Electronics A VSG Power Converter rated 500kW, 300% O/L NSEE has an exclusive agreement with; Custom Power Technology Inc. of Menomonee Falls, Wisconsin to supply the custom designed Power Converters for the RTG crane VSG Ststems 30 similar units are running on the Chicago Metro Rail system Traction Duty Construction!