A Three-Level Space Vector Modulation Scheme for Paralleled Converters to Reduce Circulating Current and Common-Mode Voltage

For high-power applications, paralleling converters is a popular approach to increase the power capacity of the system. Circulating current has been a major concern for the implementation of paralleled converters. This paper proposes a three-level space vector modulation (SVM) scheme for a system with two paralleled voltage-source converters (VSCs) with common-mode inductor (CMI) or single-phase inductors. The proposed scheme aims to reduce the zero-sequence circulating current (ZSCC) and the magnitude of common-mode voltage (CMV) of the system simultaneously. The ZSCC patterns with respect to modulation schemes are first analyzed to provide a clear understanding of the generation of ZSCC. Based on the analysis, the proposed three-level modulation scheme is introduced. Furthermore, performance regarding the ZSCC peak value, impact on the common-mode current (CMC), CMI scaling analysis, and switching losses are analyzed and compared with the existing methods. The proposed method has been verified in both simulation and experiment.

[1]  G. Gateau,et al.  Impact of PWM methods and load configuration in the design of intercell transformers used in parallel three-phase inverters , 2013, 2013 IEEE 11th International Workshop of Electronics, Control, Measurement, Signals and their application to Mechatronics.

[2]  D. Boroyevich,et al.  Common-Mode Circulating Current Control of Paralleled Interleaved Three-Phase Two-Level Voltage-Source Converters With Discontinuous Space-Vector Modulation , 2011, IEEE Transactions on Power Electronics.

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

[4]  Jeffrey Ewanchuk,et al.  Three-limb Coupled Inductor Operation for Paralleled Multi-level Three-Phase Voltage Sourced Inverters , 2013, IEEE Transactions on Industrial Electronics.

[5]  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 .

[6]  F. Blaabjerg,et al.  Modified Discontinuous PWM for Size Reduction of the Circulating Current Filter in Parallel Interleaved Converters , 2015, IEEE Transactions on Power Electronics.

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

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

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

[10]  Bin Wu,et al.  High-Power Converters and ac Drives: Wu/High-Power Converters and ac Drives , 2006 .

[11]  G. Narayanan,et al.  Common-Mode Injection PWM for Parallel Converters , 2015, IEEE Transactions on Industrial Electronics.

[12]  Gerry Moschopoulos,et al.  Three-Phase Multimodule VSIs Using SHE-PWM to Reduce Zero-Sequence Circulating Current , 2014, IEEE Transactions on Industrial Electronics.

[13]  Ahmet M. Hava,et al.  Simple Analytical and Graphical Methods for Carrier-Based PWM-VSI Drives , 1999 .

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

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

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

[17]  Jih-Sheng Lai,et al.  Design of Parallel Inverters for Smooth Mode Transfer Microgrid Applications , 2009, IEEE Transactions on Power Electronics.

[18]  Baoming Ge,et al.  Multiphase-Leg Coupling Current Balancer for Parallel Operation of Multiple MW Power Modules , 2014, IEEE Transactions on Industrial Electronics.

[19]  Bin Wu,et al.  High-Power Converters and AC Drives , 2006 .

[20]  Hirofumi Akagi,et al.  A novel control scheme of a parallel current-controlled PWM inverter , 1992 .

[21]  Richard A. Lukaszewski,et al.  Reducing Common-Mode Current: A Modified Space Vector Pulsewidth Modulation Scheme , 2014, IEEE Industry Applications Magazine.

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

[23]  G. Gateau,et al.  Parallel Three-Phase Inverters: Optimal PWM Method for Flux Reduction in Intercell Transformers , 2011, IEEE Transactions on Power Electronics.

[24]  A. Muetze,et al.  Scaling issues for common mode chokes to mitigate ground currents in inverter-based drive systems , 2005, Fourtieth IAS Annual Meeting. Conference Record of the 2005 Industry Applications Conference, 2005..

[25]  G. Narayanan,et al.  Minimization of Grid Current Distortion in Parallel-Connected Converters Through Carrier Interleaving , 2014, IEEE Transactions on Industrial Electronics.

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

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

[28]  Xu Dianguo,et al.  Deadbeat Control Strategy of Circulating Currents in Parallel Connection System of Three-Phase PWM Converter , 2014, IEEE Transactions on Energy Conversion.

[29]  A. Muetze,et al.  Simplified Design of Common-Mode Chokes for Reduction of Motor Ground Currents in Inverter Drives , 2006, IEEE Transactions on Industry Applications.

[30]  A.M. Hava,et al.  Performance Analysis of Reduced Common-Mode Voltage PWM Methods and Comparison With Standard PWM Methods for Three-Phase Voltage-Source Inverters , 2009, IEEE Transactions on Power Electronics.

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

[32]  Vassilios G. Agelidis,et al.  Current-Balancing Technique for Interleaved Voltage Source Inverters With Magnetically Coupled Legs Connected in Parallel , 2015, IEEE Transactions on Industrial Electronics.

[33]  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.

[34]  Ahmet M. Hava,et al.  Common-Mode Voltage Reduction Pulsewidth Modulation Techniques for Three-Phase Grid-Connected Converters , 2013, IEEE Transactions on Power Electronics.

[35]  Chung-Chuan Hou.  A Multicarrier PWM for Parallel Three-Phase Active Front-End Converters , 2013, IEEE Transactions on Power Electronics.

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

[37]  Kyo-Beum Lee,et al.  Fault diagnosis of three-parallel voltage-source converter for a high-power wind turbine , 2012 .