Common mode circulating current control of interleaved three-phase two-level voltage-source converters with discontinuous space-vector modulation

This paper presents the control method of common mode (CM) circulating current of paralleled three-phase two-level voltage-source converters (VSCs) with discontinuous space-vector modulation (DPWM) and interleaving. First, different inductor structures are compared and based on the comparison a new inductor structure with integrated inter-phase inductor and boost inductors is proposed. After that, the main reason of CM circulating current jump in the paralleled VSCs system is analyzed first when DPWM and interleaving are used together. The amplitude of such jump caused by the overlap between different zero vectors relates to system modulation index and interleaving angle. After that, the control method to mitigate such jump by avoiding the overlap of different zero vectors is explained. In addition, for the proposed inductor structure, the method to minimize the core flux by controlling the CM circulating current is shown. Both of the control methods will only introduce very limited additional switching actions, not affecting the system thermal design much. Experimental results have verified the analysis and the feasibility of the control methods.

[1]  H. van der Broeck,et al.  Analysis and Realization of a Pulse Width Modulator Based on Voltage Space Vectors , 1986, 1986 Annual Meeting Industry Applications Society.

[2]  I. Park,et al.  Modeling and analysis of multi-interphase transformers for connecting power converters in parallel , 1997, PESC97. Record 28th Annual IEEE Power Electronics Specialists Conference. Formerly Power Conditioning Specialists Conference 1970-71. Power Processing and Electronic Specialists Conference 1972.

[3]  Fred C. Lee,et al.  Interleaved PWM with discontinuous space-vector modulation , 1999 .

[4]  S. Bernet,et al.  Recent developments of high power converters for industry and traction applications , 2000 .

[5]  Dushan Boroyevich,et al.  Control of circulating current in two parallel three-phase boost rectifiers , 2002 .

[6]  Keiju Matsui,et al.  Parallel-connected five-level PWM inverters , 2003 .

[7]  F. Blaabjerg,et al.  An interleaved active power filter with reduced size of passive components , 2006, Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition, 2006. APEC '06..

[8]  T.-P. Chen.  Circulating zero-sequence current control of parallel three-phase inverters , 2006 .

[9]  A. Lindemann,et al.  Calculation of leakage inductance of core-type transformers for power electronic circuits , 2008, 2008 13th International Power Electronics and Motion Control Conference.

[10]  F. Wang,et al.  Interleaving impact on harmonic current in DC and AC passive components of paralleled three-phase voltage-source converters , 2008, 2008 Twenty-Third Annual IEEE Applied Power Electronics Conference and Exposition.

[11]  Dushan Boroyevich,et al.  Interleaving Impact on AC Passive Components of Paralleled Three-Phase Voltage-Source Converters , 2008, 2008 IEEE Industry Applications Society Annual Meeting.