Linearizing control of shipboard multi-machine MVDC power systems feeding Constant Power Loads

Voltage stability in Medium-Voltage DC (MVDC) power systems on ships is a key design goal. MVDC bus voltage stability can be impaired due to the presence of high-bandwidth controlled Constant Power Load (CPL) converters, which can induce negative incremental resistance instabilities. A linearization...

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Bibliographic Details
Main Authors: Sulligoi, G., Bosich, D., Lin Zhu, Cupelli, M., Monti, A.
Format: Conference Proceeding
Language:English
Subjects:
Generators
Integrated circuit modeling
Load modeling
Mathematical model
Power system stability
State feedback
Transient analysis
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Summary:Voltage stability in Medium-Voltage DC (MVDC) power systems on ships is a key design goal. MVDC bus voltage stability can be impaired due to the presence of high-bandwidth controlled Constant Power Load (CPL) converters, which can induce negative incremental resistance instabilities. A linearization via state-feedback control is presented in this paper, to stabilize a MVDC bus voltage in presence of destabilizing CPLs. Once a linear control system is obtained, a traditional stable pole placement is operated. The control is designed to be implemented using the controlled DC/DC converters that interface the system power sources to the MVDC bus. The proposed control is verified by means of time-domain numeric simulations based on both an average state space model and a detailed power electronics circuit model, thus providing a two-way comparison.
ISSN:2329-3721
2329-3748
DOI:10.1109/ECCE.2012.6342753