1 Department of Energy Technology, The Faculty of Engineering and Science, Aalborg University, VBN2 Electric Power Systems, The Faculty of Engineering and Science, Aalborg University, VBN3 The Faculty of Engineering and Science, Aalborg University, VBN4 Power Electronic Systems, The Faculty of Engineering and Science, Aalborg University, VBN5 Shanghai Maritime University6 Shanghai Maritime University
This paper addresses the harmonic stability caused by the interactions among the wideband control of power converters and passive components in an AC power-electronicsbased power system. The impedance-based analytical approach is employed and expanded to a meshed and balanced threephase network which is dominated by multiple current- and voltage- controlled inverters with LCL- and LC-filters. A method of deriving the impedance ratios for different inverters is proposed by means of the nodal admittance matrix, and thus the contribution of each inverter to the harmonic stability of the overall power system can be easily predicted through Nyquist diagrams. Time-domain simulations and experimental tests on a three-inverter-based power system are presented. The results validate the effectiveness of the theoretical approach.
I E E E Transactions on Power Electronics, 2014, Vol 29, Issue 12, p. 6421-6432
Current-controlled inverter; Voltage-controlled inverter; Impedance-based analysis; Harmonic stability; Power-electronics-based power system