Abstract
The major disadvantages of uninterruptible d.c. power supply systems in present use are either an unequal loading of individual sources or dependence on a separate control block or a dominant unit. A new redundant-type configuration featuring a feedback-controlled current sharing is proposed. Its inherent symmetry enhances the overall reliability, and, the number of parallelable sources being not limited, truly large uninterruptible d.c. power supply systems become feasible. The influence of the minor feedback loops on the system dynamical behaviour is investigated and a necessary small-perturbation stability criterion is formulated. An approximate expression relating the gain in the minor current-controlling loop to the sharing error and parameter dispersion is given.
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