Design considerations for a soft switched, modular 2.4 MVA medium voltage drive

A new six-phase, 2.4 MVA, soft-switched, medium voltage drive system utilizing series stacked modules with low voltage devices has been developed. The drive system combines a new soft-switched DC-DC converter with resonant DC link inverter technology to deliver extremely low THD sinusoidal output, high power density and high efficiency. The series stacked configuration with the associated single-phase loading lead to unique power and control design challenges. Device selection, control of parasitic elements, sensing methods for converter control, custom magnetic component design and clamping techniques have lead to a substantial improvement in device voltage utilization. The DC-DC converter controls must regulate the intermediate DC bus voltage under single phase loading while balancing transformer excitation and maintaining zero voltage switching, among other tasks. Proper control of the RDCL inverter requires the selection and tuning of the appropriate modulator and understanding its affect on the power circuit ratings.

[1]  Deepak Divan,et al.  The Resonant DC Link Converter--A New Concept in Static Power Conversion , 1986, 1986 Annual Meeting Industry Applications Society.

[2]  D.M. Divan,et al.  Design considerations for high power high frequency transformers , 1990, 21st Annual IEEE Conference on Power Electronics Specialists.

[3]  I. Dobson,et al.  Power spectrum of a sigma-delta modulator with hexagonal vector quantization and constant input , 1999, ISCAS'99. Proceedings of the 1999 IEEE International Symposium on Circuits and Systems VLSI (Cat. No.99CH36349).

[4]  Deepak Divan,et al.  New high power DC-DC converter with loss limited switching and lossless secondary clamp , 2001, 2001 IEEE 32nd Annual Power Electronics Specialists Conference (IEEE Cat. No.01CH37230).

[5]  Subhashish Bhattacharya,et al.  Inductor design for high power applications with broad spectrum excitation , 1995 .

[6]  Deepak Divan,et al.  Loss mechanisms in IGBTs under zero voltage switching , 1992, PESC '92 Record. 23rd Annual IEEE Power Electronics Specialists Conference.

[7]  Ian Dobson,et al.  Interpolative sigma delta modulators for high frequency power electronic applications , 1995, Proceedings of PESC '95 - Power Electronics Specialist Conference.

[8]  D. Divan,et al.  New developments in resonant DC link inverters , 1997, Proceedings of Power Conversion Conference - PCC '97.

[9]  P. W. Hammond.  A new approach to enhance power quality for medium voltage drives , 1995, Industry Applications Society 42nd Annual Petroleum and Chemical Industry Conference.

[10]  R. Cuzner,et al.  Evaluation of actively clamped resonant link inverter for low output harmonic distortion, high power density power converters , 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).