Optimal Control Solutions for Islanded AC Microgrids
Authors
Chopra, Sarthak ; Meda Vanaprasad, Gowtham
Term
4. term
Education
Publication year
2021
Submitted on
2021-05-28
Abstract
Microgrids are local energy systems that can disconnect from the main grid and operate autonomously, yet optimal control across different time scales is challenging. This thesis investigates a hierarchical control architecture for islanded AC microgrids that embeds primary (local voltage and frequency support) and secondary (setpoint restoration) control into a power‑flow formulation and augments it with a tertiary energy management layer. The proposed Extended Optimal Power Flow (EOPF) algorithm supervises system constraints and optimizes system‑level objectives, including economic operation, in an offline setting. The approach is modeled and simulated in MATLAB and assessed on a 6‑bus test system and a modified medium‑voltage CIGRE benchmark microgrid. Across tested scenarios, including cases with battery storage, renewable generation with possible curtailment, and load shedding, simulations indicate that the hierarchical scheme maintains power balance, supports voltage and frequency, and yields feasible operating points consistent with the chosen objectives and constraints.
Mikronet er lokale energisystemer, der kan koble sig fra hovednettet og køre autonomt, men optimal styring på tværs af forskellige tidsskalaer er udfordrende. Dette speciale undersøger en hierarkisk styringsarkitektur for isolerede AC‑mikronet, hvor primær (lokal spændings- og frekvensstøtte) og sekundær (genopretning af afvigelser) styring indarbejdes i en effektstrømsformulering, og et tertiært lag til energistyring tilføjes. Den foreslåede Extended Optimal Power Flow (EOPF) algoritme overvåger systembegrænsninger og optimerer systemniveau‑mål, herunder økonomisk drift, i en offline opsætning. Metoden er modelleret og simuleret i MATLAB og vurderet på et 6‑bus testsystem samt et modificeret mellemspændings CIGRE‑benchmark mikronet. På tværs af afprøvede scenarier, herunder batterilagring, vedvarende produktion med eventuel nedregulering samt lastafkobling, indikerer resultaterne, at den hierarkiske tilgang opretholder effektafbalancering, understøtter spænding og frekvens og finder driftspunkter, der er i overensstemmelse med opstillede mål og begrænsninger.
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Keywords