Invariant based ship DC power system design

Abstract

This paper introduces an alternative to traditional design approach - a design which provides the system components with the rules of interaction (invariants) and uses computational resources already available in the controller to implement these rules. We obtain rules of in-system interaction by analyzing power sharing in m-paralleled connected power sources feeding a complex load. We illustrate the design using the example of a system with an arbitrary number of paralleled buck converters feeding a constant power load. We introduce the found invariants into the system using synergetic control theory, analyze the closed loop performance, and define the stability conditions as well as conditions for compensating impact of constant power load, Finally, we exercise the design on a two-converter system, where we illustrate power sharing capabilities.