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access icon openaccess Stabilisation strategy based on feedback linearisation for DC microgrid with multi-converter

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 28/08/2018, Accepted 19/09/2018, Published 24/10/2018

Power electronic converters have been widely used in power system and the stability issues of DC microgrid with converters will be discussed in this study. Firstly, an equivalent circuit and the corresponding state space model for DC microgrid with DC–DC converters were established. The model shows that the DC microgrid systems with DC–DC bidirectional converter in boost or buck mode is a non-linear system, and the tightly regulated point-of-load converters may destabilise the system because it introduces negative incremental resistance to DC microgrid. Then the method of exact feedback linearisation, which transforms the non-linear system into the linear system by coordinate transformation, was applied to stabilise DC microgrid system, and the stabilisation strategy of non-linear system was determined by designing the feedback coefficient of the linearised system. Finally, the feasibility and effectiveness of the stabilisation strategy for DC microgrid with DC–DC bidirectional converter have been verified by the results of simulation with MATLAB.

Inspec keywords: linearisation techniques; linear systems; power system stability; distributed power generation; power generation control; nonlinear systems; state-space methods; DC-DC power convertors; feedback

Other keywords: multiconverter; power electronic converters; feedback linearisation; buck mode; DC microgrid system; stabilisation strategy; Matlab; boost mode; nonlinear system; point-of-load converters; DC–DC bidirectional converter; negative incremental resistance; feedback coefficient; coordinate transformation; power system stability; linearised system

Subjects: Linear control systems; Stability in control theory; Control of electric power systems; Nonlinear control systems; DC-DC power convertors; Distributed power generation; Power system control; Control system analysis and synthesis methods

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