A Current Decoupling Parallel Control Strategy of Single-Phase Inverter With Voltage and Current Dual Closed-Loop Feedback

The output characteristics of a single-phase inverter with voltage and current dual closed-loop feedback control are analyzed, and the equivalent circuit model of a parallel single-phase inverter system is introduced. By taking both resistance and inductance components of the equivalent output impedance into consideration, a current decoupling control strategy of the parallel inverter system is then proposed. Furthermore, by constructing a three-phase balanced current according to the output current of the single-phase inverter, an active and reactive current decomposition method is presented to decompose the output current of the single-phase inverter into active and reactive currents according to the instantaneous reactive power theory. The block diagram of the active and reactive current decomposition method is given, and current decomposition simulation results are shown to verify the analysis results. The prototype is developed, and the control of two parallel-connected 2-kVA inverters is realized. The experimental results show its feasibility and effectiveness.

[1]  Shyh-Jier Huang,et al.  Design of an Inverter Array for Distributed Generations With Flexible Capacity Operations , 2010, IEEE Transactions on Industrial Electronics.

[2]  Ki-Yeon Joe,et al.  Parallel operation of three-phase UPS inverters by wireless load sharing control , 2000, INTELEC. Twenty-Second International Telecommunications Energy Conference (Cat. No.00CH37131).

[3]  S.J. Chiang,et al.  Current limitation control technique for parallel operation of UPS inverters , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[4]  Gabriel Garcera,et al.  Robust Model-Following Control of Parallel UPS Single-Phase Inverters , 2007, ISIE 2007.

[5]  D. J. Adams,et al.  Harmonic and reactive power compensation based on the generalized instantaneous reactive power theory for three-phase four-wire systems , 1998 .

[6]  Yim-Shu Lee,et al.  Design and analysis of an optimal controller for parallel multi-inverter systems , 2006, IEEE Transactions on Circuits and Systems II: Express Briefs.

[7]  Hirofumi Akagi,et al.  Instantaneous Reactive Power Compensators Comprising Switching Devices without Energy Storage Components , 1984, IEEE Transactions on Industry Applications.

[8]  J. Miret,et al.  A wireless controller to enhance dynamic performance of parallel inverters in distributed generation systems , 2004, IEEE Transactions on Power Electronics.

[9]  Katsuya Hirachi,et al.  A novel small-scale UPS using a parallel redundant operation system , 2003, The 25th International Telecommunications Energy Conference, 2003. INTELEC '03..

[10]  Mauricio Aredes,et al.  Analysis and Software Implementation of a Robust Synchronizing PLL Circuit Based on the pq Theory , 2006, IEEE Transactions on Industrial Electronics.

[11]  Juan C. Vasquez,et al.  Hierarchical Control of Droop-Controlled AC and DC Microgrids—A General Approach Toward Standardization , 2009, IEEE Transactions on Industrial Electronics.

[12]  Dong-Seok Hyun,et al.  A master and slave control strategy for parallel operation of three-phase UPS systems with different ratings , 2004, Nineteenth Annual IEEE Applied Power Electronics Conference and Exposition, 2004. APEC '04..

[13]  Jong-Woo Choi,et al.  Digital PLL control for single-phase photovoltaic system , 2004 .

[14]  A.P. Martins,et al.  Design and implementation of a current controller for the parallel operation of standard UPSs , 1995, Proceedings of IECON '95 - 21st Annual Conference on IEEE Industrial Electronics.

[15]  Pierluigi Siano,et al.  A Multilevel Inverter for Photovoltaic Systems With Fuzzy Logic Control , 2010, IEEE Transactions on Industrial Electronics.

[16]  Josep M. Guerrero,et al.  Output impedance design of parallel-connected UPS inverters with wireless load-sharing control , 2005, IEEE Transactions on Industrial Electronics.

[17]  C. Q. Lee,et al.  Current Distribution Control Schemes for Parallel Connected Converter Modules Part I: Master-Slave Control , 1992 .

[18]  Josep M. Guerrero,et al.  Linear Current Control Scheme With Series Resonant Harmonic Compensator for Single-Phase Grid-Connected Photovoltaic Inverters , 2008, IEEE Transactions on Industrial Electronics.

[19]  F. Blaabjerg,et al.  Adaptive droop control applied to distributed generation inverters connected to the grid , 2008, 2008 IEEE International Symposium on Industrial Electronics.

[20]  Dehong Xu,et al.  Modeling, analysis, and implementation of parallel multi-inverter systems with instantaneous average-current-sharing scheme , 2003 .

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

[22]  Gil D. Marques,et al.  An instantaneous active and reactive current component method for active filters , 2000 .

[23]  Hua Jin,et al.  Control of parallel inverters in distributed AC power systems with consideration of line impedance effect , 2000 .

[24]  Wu Weiyang,et al.  An Alternating-master-salve Parallel Control Research for Single Phase Paralleled Inverters Based on CAN Bus , 2006, 2006 CES/IEEE 5th International Power Electronics and Motion Control Conference.

[25]  Lipei Huang,et al.  Novel control for redundant parallel UPSs with instantaneous current sharing , 2002, Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579).

[26]  M. Liserre,et al.  Multiple harmonics control for three-phase grid converter systems with the use of PI-RES current controller in a rotating frame , 2006, IEEE Transactions on Power Electronics.

[27]  Josep M. Guerrero,et al.  Wireless-control strategy for parallel operation of distributed generation inverters , 2006, Proceedings of the IEEE International Symposium on Industrial Electronics, 2005. ISIE 2005..

[28]  Kay Soon Low,et al.  Model Predictive Control of Parallel-Connected Inverters for Uninterruptible Power Supplies , 2008, IEEE Transactions on Industrial Electronics.

[29]  J. Uceda,et al.  Uninterruptible power supply systems provide protection , 2007, IEEE Industrial Electronics Magazine.

[30]  Josep M. Guerrero,et al.  Control of Distributed Uninterruptible Power Supply Systems , 2008, IEEE Transactions on Industrial Electronics.

[31]  Juan C. Vasquez,et al.  Control Strategy for Flexible Microgrid Based on Parallel Line-Interactive UPS Systems , 2009, IEEE Transactions on Industrial Electronics.

[32]  L.G. de Vicuna,et al.  Control of Line-Interactive UPS Connected in Parallel Forming a Microgrid , 2007, 2007 IEEE International Symposium on Industrial Electronics.

[33]  E.K.K. Sng,et al.  A novel communication strategy for decentralized control of paralleled multi-inverter systems , 2006, IEEE Transactions on Power Electronics.

[34]  Tsai-Fu Wu,et al.  3C strategy for inverters in parallel operation achieving an equal current distribution , 2000, IEEE Trans. Ind. Electron..

[35]  C. Q. Lee,et al.  Current distribution control for parallel connected converters. II , 1992 .

[36]  Poh Chiang Loh,et al.  A comparative analysis of multiloop voltage regulation strategies for single and three-phase UPS systems , 2003 .

[37]  Deepak Divan,et al.  Novel architectures and control for distributed UPS systems , 1994, Proceedings of 1994 IEEE Applied Power Electronics Conference and Exposition - ASPEC'94.

[38]  Josep M. Guerrero,et al.  Distributed energy resources in grid interactive AC microgrids , 2010, The 2nd International Symposium on Power Electronics for Distributed Generation Systems.

[39]  Zhaoan Wang,et al.  Auto-master-slave control technique of parallel inverters in distributed AC power systems and UPS , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[40]  C. Q. Lee,et al.  A unified averaging technique for the modeling of quasi-resonant converters , 1998 .