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Stabilization of a Cascaded Converter MVDC System Through Passivity Based Control

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Advanced high-power shipboard applications such as electromagnetic rail-guns, semiconductor lasers, advanced radar, etc. create an emergent need to support large electric dynamic loads on various Navy vessels. With the necessary push towards highly regulated DC distribution through power electronics, these loads are becoming more likely to cause destabilizing behavior at their source interface. Traditionally it has been suffcient to ensure the stability of a system through small signal methods such as pole placement or loop shaping. However, with the large system transients expected in advanced high-power shipboard applications, more sophisticated control algorithms are necessary to ensure both large signal stability and minimal impact on the distribution system. In this study, an analytical example of a cascaded converter system feeding a time-varying constant power load is large signal stabilized at a desired operating point through Interconnection and Damping Assignment Passivity Based Control (IDA-PBC). Through inserting tunable control parameters into the designed nonlinear controller, the impact of dynamical loads on upstream distribution can be mitigated and thus made compatible with low inertia systems.

Document Type: Research Article

Publication date: December 1, 2019

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  • The Naval Engineers Journal is the peer-reviewed journal of the American Society of Naval Engineers (ASNE). ASNE is the leading professional engineering society for engineers, scientists and allied professionals who conceive, design, develop, test, construct, outfit, operate and maintain complex naval and maritime ships, submarines and aircraft and their associated systems and subsystems.
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