Stability Analysis of a Parallel-Converter System with Master/Slave Configuration

Parallel operation of power converters provides a promising solution for the integration of distributed generations. To properly share the load power among different converters, the master-slave control architecture has been widely adopted in the literature. In this paper, it is revealed that the interactions among the master converter and the slave converters will cause instability under certain conditions. To properly explain the mechanism and address this problem, an explicit frequency-domain stability analysis of the parallel-converter system is presented in this paper, which would provide valuable guidance for the converter controller design. Finally, simulation results of a parallel-converter system with master-slave configuration are presented for verification.

[1]  Qing-Chang Zhong,et al.  Robust Droop Controller for Accurate Proportional Load Sharing Among Inverters Operated in Parallel , 2013, IEEE Transactions on Industrial Electronics.

[2]  K H Ahmed,et al.  Improved Instantaneous Average Current-Sharing Control Scheme for Parallel-Connected Inverter Considering Line Impedance Impact in Microgrid Networks , 2011, IEEE Transactions on Power Electronics.

[3]  Oriol Gomis-Bellmunt,et al.  Trends in Microgrid Control , 2014, IEEE Transactions on Smart Grid.

[4]  Paolo Mattavelli,et al.  Microgrids Operation Based on Master–Slave Cooperative Control , 2013, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[5]  Francesco Bullo,et al.  Synchronization and power sharing for droop-controlled inverters in islanded microgrids , 2012, Autom..

[6]  Florian Dörfler,et al.  Voltage stabilization in microgrids via quadratic droop control , 2013, 52nd IEEE Conference on Decision and Control.

[7]  Johannes Schiffer,et al.  On power sharing and stability in autonomous inverter-based microgrids , 2012, 2012 IEEE 51st IEEE Conference on Decision and Control (CDC).

[8]  Jian Sun,et al.  Delay effects in averaged modeling of PWM converters , 1999, 30th Annual IEEE Power Electronics Specialists Conference. Record. (Cat. No.99CH36321).

[9]  Juan C. Vasquez,et al.  Distributed Secondary Control for Islanded Microgrids—A Novel Approach , 2014, IEEE Transactions on Power Electronics.

[10]  Guoqiang Hu,et al.  Distributed power sharing control of grid-connected AC microgrid , 2016, 2016 IEEE 55th Conference on Decision and Control (CDC).

[11]  Jianguo Zhou,et al.  Consensus-Based Distributed Control for Accurate Reactive, Harmonic, and Imbalance Power Sharing in Microgrids , 2018, IEEE Transactions on Smart Grid.

[12]  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..

[13]  Juan C. Vasquez,et al.  Adaptive Droop Control Applied to Voltage-Source Inverters Operating in Grid-Connected and Islanded Modes , 2009, IEEE Transactions on Industrial Electronics.

[14]  Frede Blaabjerg,et al.  Overview of Control and Grid Synchronization for Distributed Power Generation Systems , 2006, IEEE Transactions on Industrial Electronics.

[15]  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).

[16]  F. Blaabjerg,et al.  Control of Power Converters in AC Microgrids , 2012, IEEE Transactions on Power Electronics.