Small-signal stability enhancement of communicationless parallel connected inverters

R. M. Santos Filho, P. F. Seixas, P. C. Cortizo, G. Gateau
2009 2009 35th Annual Conference of IEEE Industrial Electronics  
In this paper, small-signal stability issues of parallel-connected voltage source inverters without control interconnections are addressed by means of a multivariable approach. The performed small-signal dynamic analysis showed that the system stability margin is reduced when the composition of the inverter connection impedance is neither purely inductive nor purely resistive, which are two common approximations found in the literature. Based on a multivariable approach, this paper proposes the
more » ... application of decoupling to the control of parallel inverters in order to increase stability range concerning the connection impedance composition R/X. It is shown that decoupling can lead to good results even without precise knowledge of actual connection impedance R/X. Experimental results are presented and corroborate the presented ideas.
doi:10.1109/iecon.2009.5415032 fatcat:lvt2u4bxuzh3fa2ijq5dlisyh4