Abstract
The increasing number of dc loads, dc-based distributed energy resources (DERs) and energy storage systems (ESS) have spotlighted the dc microgrids as a strong candidate in the future distribution systems. Several factors, such as the higher efficiency and the lack of frequency and reactive power regulation, enforced the dc against the ac distribution. This paper presents a complete study on model-based dynamic nonlinear representation, control design and stability analysis of dc microgrids in stand-alone operation. By this way the dc microgrids are easily integrated into the distribution network in order to achieve: a) a systematic analysis and control of autonomous dc microgrids with different DERs units operating in desired power level, and b) the sharing of the ESS charging/discharging and the dc voltage regulation. Suitable current-mode cascaded controllers are implemented on the power converter interfaces which include droop-based feedback. The whole deployment is presented in an open and expandable formulation, while the theoretical stability analysis is conducted under the view of advanced Lyapunov techniques. Hence, now the analysis is globally valid opposite to the conventional small signal linear methods which are valid only for specific system conditions. Furthermore, the stability analysis is given in a generic form, while the entire methodology is applicable to every structure of dc microgrids with variable topology, number of DERs, loads, ESS and parameter values.
Published Version
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