Three-Phase Multimodule VSIs Using SHE-PWM to Reduce Zero-Sequence Circulating Current

A modular voltage-source inverter (MVSI) uses individual three-phase modules in a shunt connection to allow lower power rated inverters to be implemented in higher power applications. It is standard practice to implement each module with the same pulsewidth-modulation (PWM) pattern. This paper proposes a new PWM approach for MVSIs for which each module is made to operate with a different PWM pattern. It is shown in this paper how more output voltage harmonics can be eliminated with the new approach than with the standard approach and how the new approach can be expanded to significantly reduce zero-sequence current that circulates among the inverter modules. The mathematical formulations needed to generate appropriate PWM patterns for the new PWM approach and experimental results obtained from a prototype MVSI are presented in this paper as well.

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

[2]  V. Agelidis,et al.  Multiple sets of solutions for harmonic elimination PWM bipolar waveforms: analysis and experimental verification , 2006, IEEE Transactions on Power Electronics.

[3]  G. Joos,et al.  Selective Harmonic Elimination in Multimodule Three-Phase Current-Source Converters , 2010, IEEE Transactions on Power Electronics.

[4]  Tsung-Po Chen,et al.  Zero-Sequence Circulating Current Reduction Method for Parallel HEPWM Inverters Between AC Bus and DC Bus , 2012, IEEE Transactions on Industrial Electronics.

[5]  A. Kavousi,et al.  Application of the Bee Algorithm for Selective Harmonic Elimination Strategy in Multilevel Inverters , 2012, IEEE Transactions on Power Electronics.

[6]  Tsai-Fu Wu,et al.  Current Weighting Distribution Control Strategy for Multi-Inverter Systems to Achieve Current Sharing , 2007, IEEE Transactions on Power Electronics.

[7]  Tsai-Fu Wu,et al.  Parallel-Inverter System With Failure Isolation and Hot-Swap Features , 2007, IEEE Transactions on Industry Applications.

[8]  Francesc Guinjoan,et al.  Interleaving Quasi-Sliding-Mode Control of Parallel-Connected Buck-Based Inverters , 2008, IEEE Transactions on Industrial Electronics.

[9]  Ashwin M. Khambadkone,et al.  Reliability Analysis and Cost Optimization of Parallel-Inverter System , 2012, IEEE Transactions on Industrial Electronics.

[10]  Ching-Tsai Pan,et al.  Modeling and Coordinate Control of Circulating Currents in Parallel Three-Phase Boost Rectifiers , 2007, IEEE Transactions on Industrial Electronics.

[11]  G. Moschopoulos,et al.  Three-phase multi-module VSIs using SHE-PWM with reduced zero-sequence circulating current , 2012, 2012 IEEE Energy Conversion Congress and Exposition (ECCE).

[12]  Leopoldo García Franquelo,et al.  Selective Harmonic Mitigation Technique for High-Power Converters , 2010, IEEE Transactions on Industrial Electronics.

[13]  Robert Turner,et al.  Stability and Bandwidth Implications of Digitally Controlled Grid-Connected Parallel Inverters , 2010, IEEE Transactions on Industrial Electronics.

[14]  Tsung-Po Chen,et al.  Common-Mode Ripple Current Estimator for Parallel Three-Phase Inverters , 2007, IEEE Transactions on Power Electronics.

[15]  Yao Zhang,et al.  Theoretical and Experimental Investigation of Networked Control for Parallel Operation of Inverters , 2012, IEEE Transactions on Industrial Electronics.

[16]  Xiaoli Du,et al.  A Generalized Half-Wave Symmetry SHE-PWM Formulation for Multilevel Voltage Inverters , 2010, IEEE Transactions on Industrial Electronics.

[17]  Yun Wei Li,et al.  Investigation and Active Damping of Multiple Resonances in a Parallel-Inverter-Based Microgrid , 2013, IEEE Transactions on Power Electronics.

[18]  D. Ahmadi,et al.  A Universal Selective Harmonic Elimination Method for High-Power Inverters , 2011, IEEE Transactions on Power Electronics.

[19]  G. Moschopoulos,et al.  Selective harmonic elimination in three-phase multi-module voltage-source inverters , 2012, 2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[20]  P.N. Enjeti,et al.  Programmed PWM techniques to eliminate harmonics - A critical evaluation , 1988, Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting.

[21]  Thierry Meynard,et al.  PD Modulation Scheme for Three-Phase Parallel Multilevel Inverters , 2012, IEEE Transactions on Industrial Electronics.

[22]  Richard G. Hoft,et al.  Generalized Techniques of Harmonic Elimination and Voltage Control in Thyristor Inverters: Part I--Harmonic Elimination , 1973 .

[23]  Yu Zhang,et al.  The zero-sequence circulating currents between parallel three-phase inverters with three-pole transformers and reactors , 2006, Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition, 2006. APEC '06..

[24]  ZhiHong Bai,et al.  Conformation of Multilevel Current Source Converter Topologies Using the Duality Principle , 2008, IEEE Transactions on Power Electronics.

[25]  S. Sugimoto,et al.  Application of Series Type BTB Converter for Minimizing Circulating Current and Balancing Power Transformers in Loop Distribution Lines , 2007, 2007 Power Conversion Conference - Nagoya.

[26]  Sergio Busquets-Monge,et al.  A Multilevel Active-Clamped Converter Topology—Operating Principle , 2011, IEEE Transactions on Industrial Electronics.

[27]  Tsung-Po Chen.  Dual-Modulator Compensation Technique for Parallel Inverters Using Space-Vector Modulation , 2009, IEEE Transactions on Industrial Electronics.

[28]  Ching-Tsai Pan,et al.  Modeling and Control of Circulating Currents for Parallel Three-Phase Boost Rectifiers With Different Load Sharing , 2008, IEEE Transactions on Industrial Electronics.

[29]  Kay Soon Low,et al.  Model Predictive Control of Parallel Connected Inverters for Uninterruptible Power Supplies , 2006 .

[30]  J. Luukko,et al.  Modeling and Analysis of the Dead-Time Effects in Parallel PWM Two-Level Three-Phase Voltage-Source Inverters , 2009, IEEE Transactions on Power Electronics.

[31]  Ashwin M. Khambadkone,et al.  Control of paralleled PEBBs to facilitate the efficient operation of microgrid , 2010, 2010 IEEE International Symposium on Industrial Electronics.