This paper studies a system of parallelconnected dc/dc buck converters under democratic currentsharing control. Under this control scheme, the reference current is generated by a typical proportional-integral (PI) controller for voltage regulation and the currents in individual converters are programmed by a built-in interleaving switching control. The effects of variations of practical parameters such as proportional gain, integral time constant, duty ratio and output power level are studied. Extensive simulations are performed to capture the Hopf bifurcation boundary which is the first instability boundary of practical importance. Unlike those in some previous studies which use abstract system parameters, the results in this paper are presented in terms of practical parameters and hence can be directly used for comparison of operating ranges for practical parallel-connected converters.
|Number of pages
|Published - 2006
|International Symposium on Nonlinear Theory and Its Applications (2006)||NOLTA2006 -
Duration: 1 Jan 2006 → …
|International Symposium on Nonlinear Theory and Its Applications (2006)||NOLTA2006
|1/01/06 → …