Design of a high power low losses DC-DC converter for mining applications

This paper proposes a new design procedure for a bidirectional LCL converter which has a potential to be applied in mobile mine equipment. This type of a converter employs two DC/AC insulated-gate bipolar transistor-based (IGBT) converters and a passive LCL filter instead of a traditional high frequency transformer. LCL filter design is based on both zero reactive power circulation and minimization of voltage across the capacitor. Switching losses are minimized by using soft switching operation. Lower capacitor voltage and related lower stepping ratio can be mitigated by choosing an appropriate switching frequency. The designed converter has attractive performance characteristics under DC faults. The design process and converter performance evaluation are carried out using EMTP-RV digital simulation for a 20-MW 24kV/1.2kV converter. The proposed converter design is experimentally validated by developing a 200-W 100V/20V prototype converter.

[1]  D. Jovcic.  Bidirectional, High-Power DC Transformer , 2009, IEEE Transactions on Power Delivery.

[2]  M.P. Bahrman,et al.  The ABCs of HVDC transmission technologies , 2007, IEEE Power and Energy Magazine.

[3]  Lu Zhang,et al.  LCL DC/DC Converter for DC Grids , 2013, IEEE Transactions on Power Delivery.

[4]  Chih-Ju Chou,et al.  Comparative Evaluation of the HVDC and HVAC Links Integrated in a Large Offshore Wind Farm—An Actual Case Study in Taiwan , 2012, IEEE Transactions on Industry Applications.

[5]  Galina Mirzaeva,et al.  DC power vs AC power for mobile mining equipment , 2014, 2014 IEEE Industry Application Society Annual Meeting.

[6]  Bo Feng,et al.  A novel dual-phase-shift control strategy for dual-active-bridge DC-DC converter , 2014, IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society.

[7]  Hiroaki Kakigano,et al.  Low-Voltage Bipolar-Type DC Microgrid for Super High Quality Distribution , 2010, IEEE Transactions on Power Electronics.

[8]  Osama Mohammed,et al.  Protection design and coordination of DC Distributed Power Systems Architectures , 2013, 2013 IEEE Power & Energy Society General Meeting.

[9]  A. Sannino,et al.  An Adaptive Control System for a DC Microgrid for Data Centers , 2007, IEEE Transactions on Industry Applications.

[10]  J. L. Kirtley,et al.  Design of DC system protection , 2013, 2013 IEEE Electric Ship Technologies Symposium (ESTS).

[11]  Wuhua Li,et al.  A Review of Non-Isolated High Step-Up DC/DC Converters in Renewable Energy Applications , 2009, 2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition.

[12]  R.D. Lorenz,et al.  A new ZVS LCL-resonant push-pull DC-DC converter topology , 1997, IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.

[13]  Galina Mirzaeva,et al.  Advanced fault tolerance strategy for DC microgrids in mining excavators , 2015, 2015 IEEE 24th International Symposium on Industrial Electronics (ISIE).

[14]  K. Hirachi,et al.  Circuit configuration of bidirectional DC/DC converter specific for small scale load leveling system , 2002, Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579).