Common-Mode Circulating Current Control of Paralleled Interleaved Three-Phase Two-Level Voltage-Source Converters With Discontinuous Space-Vector Modulation

This paper presents a control method to limit the common-mode (CM) circulating current between paralleled three-phase two-level voltage-source converters (VSCs) with discontinuous space-vector pulsewidth modulation (DPWM) and interleaved switching cycles. This CM circulating current can be separated into two separate components based on their frequency; the high-frequency component, close to the switching frequency, can be effectively limited by means of passive components; the low-frequency component, close to the fundamental frequency, embodies the jumping CM circulating current observed in parallel VSCs. This is the main reason why it is usually recommended not to implement discontinuous and interleaving PWM together. The origin of this low-frequency circulating current is analyzed in detail, and based on this, a method to eliminate its presence is proposed by impeding the simultaneous use of different zero vectors between the converters. This control method only requires six additional switching actions per line cycle, presenting a minimum impact on the converter thermal design. The analysis and the feasibility of the control method are verified by simulation and experimental results.

[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]  Keiju Matsui,et al.  Parallel-connections of pulsewidth modulated inverters using current sharing reactors , 1995 .

[3]  L. Matakas,et al.  High power, high performance parallel connected multiconverters: analysis and control , 1995, 1995 Proceedings of the IEEE International Symposium on Industrial Electronics.

[4]  L. Matakas,et al.  Low harmonics, decoupled histeresis type current control of a multiconverter consisting of a parallel transformerless connection of VSC converters , 1997, IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.

[5]  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.

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

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

[8]  C. Y. Yen,et al.  A multimodule parallelable series-connected PWM voltage regulator , 2001, IEEE Trans. Ind. Electron..

[9]  Chung-Yuen Won,et al.  Unit power factor operation of parallel operated AC to DC PWM converter for high power traction application , 2001, 2001 IEEE 32nd Annual Power Electronics Specialists Conference (IEEE Cat. No.01CH37230).

[10]  R.W. De Doncker,et al.  Novel topology for parallel connection of soft switching, high power, high frequency inverters , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

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

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

[13]  Thomas A. Lipo,et al.  Pulse Width Modulation for Power Converters: Principles and Practice , 2003 .

[14]  Sudip K. Mazumder,et al.  A novel discrete control strategy for independent stabilization of parallel three-phase boost converters by combining space-vector modulation with variable-structure control , 2003 .

[15]  C. Casablanca,et al.  Interleaving and Harmonic Cancellation Effects in Modular Three-Phase Voltage-Sourced Converters , 2006, 2006 IEEE Workshops on Computers in Power Electronics.

[16]  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..

[17]  Kazuto Takao,et al.  Novel exact power loss design method for high output power density converter , 2006 .

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

[19]  Praveen K. Jain,et al.  Circulating Current Minimization in High-Frequency AC Power Distribution Architecture With Multiple Inverter Modules Operated in Parallel , 2007, IEEE Transactions on Industrial Electronics.

[20]  Johann W. Kolar,et al.  Parallel Connection of Two Three-Phase Three-Switch Buck-Type Unity-Power-Factor Rectifier Systems With DC-Link Current Balancing , 2007, IEEE Transactions on Industrial Electronics.

[21]  Frede Blaabjerg,et al.  Shunt Active-Power-Filter Topology Based on Parallel Interleaved Inverters , 2008, IEEE Transactions on Industrial Electronics.

[22]  Dushan Boroyevich,et al.  Impact of Interleaving on AC Passive Components of Paralleled Three-Phase Voltage-Source Converters , 2010, IEEE Transactions on Industry Applications.

[23]  Dushan Boroyevich,et al.  DC-Link Ripple Current Reduction for Paralleled Three-Phase Voltage-Source Converters With Interleaving , 2011, IEEE Transactions on Power Electronics.