Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 30, Issue 8, Pages 4597-4607Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2014.2360171
Keywords
Bifurcation analysis; constant power load (CPL); DC microgrid; droop control; nonlinear stability analysis
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Funding
- Coordination for the Improvement of Higher Education Personnel, Brazil
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The stability of dc microgrids (MGS) depends on the control strategy adopted for eachmode of operation. In an islanded operation mode, droop control is the basic method for bus voltage stabilization when there is no communication among the sources. In this paper, it is shown the consequences of droop implementation on the voltage stability of dc power systems, whose loads are active and nonlinear, e.g., constant power loads. The set of parallel sources and their corresponding transmission lines are modeled by an ideal voltage source in series with an equivalent resistance and inductance. This approximate model allows performing a nonlinear stability analysis to predict the system qualitative behavior due to the reduced number of differential equations. Additionally, nonlinear analysis provides analytical stability conditions as a function of the model parameters and it leads to a design guideline to build reliable (MGS) based on safe operating regions.
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