Developing a Control Strategy for Frequency Stability using Battery Energy Storage System in Microgrid
Translated title
Udvikling af en kontrolstrategi for frekvensstabilitet ved hjælp af batterienergilagringssystem i Microgrid
Author
Rwagasore, Thierry Mucunguzi
Term
4. term
Education
Publication year
2021
Submitted on
2021-10-28
Pages
65
Abstract
This thesis tackles frequency stability challenges in microgrids with high shares of renewables by developing and testing a control strategy for a Battery Energy Storage System (BESS). The study focuses on the Livø island microgrid with distributed energy resources, where the BESS provides primary frequency control by absorbing surplus generation and supplying power during deficits. The work reviews microgrid operation, frequency stability, BESS technologies, and relevant requirements, and models key components (diesel generator, wind turbine, PV, hot water storage tank, and BESS). The proposed BESS control is implemented in a Livø network model and evaluated through DIgSILENT PowerFactory simulations under two operating scenarios: low demand/high renewable output and high demand/low renewable output. Simulation results indicate improved frequency stability with the control in both cases. An initial 5 kW BESS proves too small to absorb excess production, and a sensitivity analysis identifies around 25 kW as a more suitable power rating for the studied system.
Denne afhandling adresserer udfordringer med frekvensstabilitet i mikronet med høj andel af vedvarende energi ved at udvikle og afprøve en kontrolstrategi for et batterienergilagringssystem (BESS). Fokus er Livø ø-mikronettet med distribuerede energikilder, hvor BESS’et skal bidrage med primær frekvensregulering ved at optage overskudsproduktion og levere effekt ved underskud. Arbejdet omfatter en gennemgang af mikronetdrift, frekvensstabilitet, BESS-teknologier og relevante krav samt modellering af centrale komponenter (dieselgenerator, vindmølle, PV, varmtvandslager og BESS). Den udviklede BESS-kontrol implementeres i et netværksmodel for Livø og evalueres via simuleringer i DIgSILENT PowerFactory under to driftscenarier: lavt forbrug/høj VE og højt forbrug/lav VE. Resultaterne viser, at kontrollen forbedrer frekvensstabiliteten i begge scenarier. Et BESS med 5 kW effektrating er imidlertid for lille til at optage overskudsproduktion, og en følsomhedsanalyse peger på omkring 25 kW som en mere egnet størrelse for det undersøgte system.
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Keywords
Other projects by the authors
Rwagasore, Thierry Mucunguzi:
- 24V Step-down converter (2017)