A Fully Modular Control Strategy for Input-Series Output-Parallel (ISOP) Inverter System Based on Positive Output-Voltage-Amplitude Gradient

In this paper, a fully modular control strategy for input-series output-parallel (ISOP) inverter system is proposed to ensure equal sharing of input voltage and output current among the constituent inverters. Compared with existing control strategies, such as centralized control that restricts the modularity of the system and distributed control, which realizes voltage and current sharing by means of connecting constituent inverter modules through sharing buses, the proposed control strategy can achieve fully modular design without any control signal interconnection among the constituent inverters, leading to superior modularity and reliability. First, the control strategy is deduced and the principle of the control strategy is analyzed. Then, the detailed implementation and stability analysis of the proposed strategy are presented. At last, a two-module ISOP inverter system is tested in the laboratory and the experimental results verify the effectiveness of the proposed control strategy.

[1]  Xinbo Ruan,et al.  Input-Series and Output-Parallel Connected Inverter System for High Input Voltage Applications , 2009, 2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition.

[2]  Xinbo Ruan,et al.  Distributed Control and Redundant Technique to Achieve Superior Reliability for Fully Modular Input-Series-Output-Parallel Inverter System , 2017, IEEE Transactions on Power Electronics.

[3]  Frank L. Lewis,et al.  Distributed adaptive droop control for DC distribution systems , 2016 .

[4]  Byeong-Mun Song,et al.  A three-level DC-DC converter with wide-input voltage operations for ship-electric-power-distribution systems , 2003, IEEE Transactions on Plasma Science.

[5]  Frank L. Lewis,et al.  Droop-Free Distributed Control for AC Microgrids , 2016 .

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

[7]  Jinjun Liu,et al.  A Unified Virtual Power Decoupling Method for Droop-Controlled Parallel Inverters in Microgrids , 2016, IEEE Transactions on Power Electronics.

[8]  Xinbo Ruan,et al.  Wireless Input-Voltage-Sharing Control Strategy for Input-Series Output-Parallel (ISOP) System Based on Positive Output-Voltage Gradient Method , 2014, IEEE Transactions on Industrial Electronics.

[9]  Xinbo Ruan,et al.  Control Strategy for Input-Series–Output-Parallel Converters , 2009, IEEE Transactions on Industrial Electronics.

[10]  Kaustuva Acharya,et al.  Master–Slave Current-Sharing Control of a Parallel DC–DC Converter System Over an RF Communication Interface , 2008, IEEE Transactions on Industrial Electronics.

[11]  Xiangning He,et al.  Common-Duty-Ratio Control of Input-Series Output-Parallel Connected Phase-shift Full-Bridge DC–DC Converter Modules , 2011, IEEE Transactions on Power Electronics.

[12]  Jung-Won Kim,et al.  Modeling, control, and design of input-series-output-parallel-connected converter for high-speed-train power system , 2001, IEEE Trans. Ind. Electron..

[13]  R. Ayyanar,et al.  Active input-voltage and load-current sharing in input-series and output-parallel connected modular DC-DC converters using dynamic input-voltage reference scheme , 2004, IEEE Transactions on Power Electronics.

[14]  Zhigang Liu,et al.  A Novel Traction Supply System for Urban Rail Transportation with Bidirectional Power Flow and Based on PWM Rectifier , 2009, 2009 International Conference on Energy and Environment Technology.

[15]  Xinbo Ruan,et al.  A Input-Series- and Output-Parallel-Connected Inverter System for High-Input-Voltage Applications , 2009, IEEE Transactions on Power Electronics.

[16]  Gabriel Garcera,et al.  Analysis and design of a robust average current mode control loop for parallel buck DC-DC converters to reduce line and load disturbance , 2004 .

[17]  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..

[18]  Wu Chen,et al.  Decentralized Voltage-Sharing Control Strategy for Fully Modular Input-Series–Output-Series System With Improved Voltage Regulation , 2015, IEEE Transactions on Industrial Electronics.

[19]  Hui Li,et al.  A distributed control of input-series-output-parallel bidirectional dc-dc converter modules applied for 20 kVA solid state transformer , 2011, 2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[20]  Ali Emadi,et al.  Uninterruptible power supplies: classification, operation, dynamics, and control , 2002, APEC. Seventeenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.02CH37335).

[21]  Stephen J. Finney,et al.  Distributed Control of a Fault-Tolerant Modular Multilevel Inverter for Direct-Drive Wind Turbine Grid Interfacing , 2013, IEEE Transactions on Industrial Electronics.

[22]  Yu Fang,et al.  Voltage Sharing Control for Interleaving Series-Parallel Dual Two-Transistor Forward Converter , 2007, IECON 2007 - 33rd Annual Conference of the IEEE Industrial Electronics Society.

[23]  Xinbo Ruan,et al.  General Control Considerations for Input-Series Connected DC/DC Converters , 2009, IEEE Transactions on Circuits and Systems I: Regular Papers.

[24]  Xinbo Ruan,et al.  DC/DC Conversion Systems Consisting of Multiple Converter Modules: Stability, Control, and Experimental Verifications , 2009, IEEE Transactions on Power Electronics.

[25]  Xiaozhong Liao,et al.  Control Strategy for Input-Series–Output-Parallel High-Frequency AC Link Inverters , 2012, IEEE Transactions on Industrial Electronics.

[26]  T. Matsumoto,et al.  High power AC/DC converter and DC/AC inverter for high speed train applications , 2000, 2000 TENCON Proceedings. Intelligent Systems and Technologies for the New Millennium (Cat. No.00CH37119).

[27]  Jinjun Liu,et al.  Output Impedance Modeling and Stability Prediction of Three-Phase Paralleled Inverters With Master–Slave Sharing Scheme Based on Terminal Characteristics of Individual Inverters , 2016, IEEE Transactions on Power Electronics.