Quasi-Static Time-Series Power Flow Solution for Islanded and Unbalanced Three-Phase Microgrids

IEEE Open Access Journal of Power and Energy

Taehyung Kim¹  Surya Santoso¹  Nicholas Barry¹  Piyapath Siratarnsophon¹  Vinicius C. Cunha²  Walmir Freitas² 

[1] Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX, USA;Department of Systems and Energy, University of Campinas, Campinas, Brazil;

关键词: Distributed generation;    energy storage systems;    islanded microgrid;    OpenDSS;    QSTS power flow;   

DOI  :  10.1109/OAJPE.2021.3062312

来源: DOAJ

【 摘 要 】

Recent advances in inverter-based distributed energy resources (DERs) allow microgrids to operate in grid-connected and islanded modes with ease. However, determining a steady-state load flow solution of a real-world unbalanced and islanded three-phase microgrid remains a challenge. Existing methods are either unsuitable, labor-intensive or computationally demanding for a long-term analysis of islanded microgrids. To address these issues, we propose a practical solution framework that employs externally-updated system frequency, power quantities, and droop characteristics governing the voltage and phase angle of DERs in every iteration as inputs to an off-the-shelf open-source multi-phase, multi-wire, unbalanced power flow software tool to solve an islanded-microgrid power flow. Using our framework, users only need to implement a set of droop equations and update system variables. The power flow solution is accomplished entirely by an off-the-shelf power flow tool, e.g., OpenDSS. Our proposed framework can model a microgrid of any arbitrary configuration and operating condition. We demonstrate and validate the proposed method’s efficacy by comparing its results with those modeled using a time-domain simulation with PSCAD/EMTDC. Finally, an example of a quasi-static time-series study is presented to better illustrate the application of such a tool.

【 授权许可】

Unknown