Variable Speed Generator System for retrofitting RTG Cranes - PowerPoint PPT Presentation

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 Aux. Loads be incorporated into existing RTG Cranes 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, M M M M M a further improvement in peak power of about 60kW can be incorporated for heavy lifts 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 M The Bypass Switchgear can be used to switch back to the Trolley original mode of fixed generator speed operation 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 Battery is added directly M M M M M to the DC Link 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, Battery the bypass can be M M M removed and a M M smaller generator put Trolley Hoist in place for maximum M M fuel savings Gantry

VSG – Generator control interface diagram Non­Synchronous Energy Electronics Toggle idle/rated Speed Speed Trim V fb AVR PMG Field Current Controller Field Current Supply VSG Throttle Speed fb Control 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!