Resonance analysis and suppression of system with multiple grid-connected inverters

The resonances of grid-connected system with multiple inverters would enlarge harmonics which bring challenges to the performance of inverters and power quality of the grid. The impedance model of the system is established and the resonant mechanism and characteristics is analyzed. From the analysis result, a global resonance suppression strategy based on virtual admittance is proposed which only reshapes the grid impedance around the resonance point, and it has little influence on fundamental wave control. The capacity of the harmonic suppression unit is decreased while the suppression effect is assured. The simulation results verified the correctness of theoretical analysis and the effectiveness of the proposed method.

[1]  Xie Nin.  Dynamic Modeling and Characteristic Analysis on Harmonics of Photovoltaic Power Stations , 2013 .

[2]  P.J.M. Heskes,et al.  Harmonic interaction between a large number of distributed power inverters and the distribution network , 2004, IEEE Transactions on Power Electronics.

[3]  Frede Blaabjerg,et al.  An active damper to suppress multiple resonances with unknown frequencies , 2014, 2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014.

[4]  T. Suntio,et al.  Impedance-Based Stability and Transient-Performance Assessment Applying Maximum Peak Criteria , 2013, IEEE Transactions on Power Electronics.

[5]  Frede Blaabjerg,et al.  An Active Damper for Stabilizing Power-Electronics-Based AC Systems , 2014 .

[6]  Jian Sun,et al.  Impedance-Based Stability Criterion for Grid-Connected Inverters , 2011, IEEE Transactions on Power Electronics.

[7]  Jian Sun,et al.  Renewable Energy Systems Instability Involving Grid-Parallel Inverters , 2009, 2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition.

[8]  Wang Shouxiang,et al.  Study on Some Key Problems Related to Distributed Generation Systems , 2008 .

[9]  Jih-Sheng Lai,et al.  Admittance Compensation in Current Loop Control for a Grid-Tie LCL Fuel Cell Inverter , 2008 .

[10]  M. Liserre,et al.  Future Energy Systems: Integrating Renewable Energy Sources into the Smart Power Grid Through Industrial Electronics , 2010, IEEE Industrial Electronics Magazine.

[11]  Jian Sun,et al.  A study of renewable energy system harmonic resonance based on a DG test-bed , 2011, 2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).