Utilization of Supplementary Energy Storage Systems in High Power Mining Converters

This paper proposes the utilization of ultracapacitor as additional energy storage device in high power AC mining converters. A critical requirement for these converters is to be able to maintain a robust DC link under all operating conditions. However, due to lower switching frequencies of the IGBT devices, the bandwidth of the controllers is limited. As a result, during regenerative periods, the DC link voltage may have a tendency to increase. Protective devices like choppers and crowbars are added to the system. Integration of the ultracapacitor system to the converter can aid the recovery and storage of the regenerative energy and reutilize that energy for meeting the systems power demand. This will improve the overall performance of the system and reduce the dependence on the chopper and crowbar circuits. Implementation of this system translates to power quality improvement of the main grid.

[1]  W. Koellner.  A New All AC Gearless Drive System for Large Mining Draglines , 2006, Conference Record of the 2006 IEEE Industry Applications Conference Forty-First IAS Annual Meeting.

[2]  J. Pontt,et al.  Operating experience of shovel drives for mining applications , 2002, Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344).

[3]  Rik W. De Doncker,et al.  Analysis and evaluation of charge balancing circuits on performance, reliability and lifetime of supercapacitor systems , 2003, 38th IAS Annual Meeting on Conference Record of the Industry Applications Conference, 2003..

[4]  A.Q. Huang,et al.  Modeling and design of a transmission ultracapacitor (TUCAP) integrating modular voltage source converter with ultracapacitor energy storage , 2006, Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition, 2006. APEC '06..

[5]  R. Iravani,et al.  Dynamic model and control of the NPC-based back-to-back HVDC system , 2006, IEEE Transactions on Power Delivery.

[6]  Walter Koellner,et al.  Increased productivity with AC drives for mining excavators and haul trucks , 2000, Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy (Cat. No.00CH37129).

[7]  Jorge Pontt,et al.  Recent advances in mining haul trucks , 2004, IEEE Transactions on Industrial Electronics.