Design of a Microgrid for Bukunor Water Treatment Plant: Control Design and Simulation of Grid-Following Inverters in a Renewable Microgrid
Translated title
Design of a Microgrid for Bukunor Water Treatment Plant
Authors
Hass, Marcel ; Bigej, Morgan Anita ; Appiah-Nkansah, Kofi ; Upadhyay, Yuvraj ; Mukherjee, Rajarshi ; Juricic, Nika
Term
1. term
Education
Publication year
2025
Submitted on
2025-12-19
Pages
102
Abstract
Mikronet er små, lokale elnet, der kombinerer kilder som vind og sol med energilagring. De bruger effektelektroniske omformere til at forbinde disse ressourcer på en kontrolleret og pålidelig måde. Dette projekt designer og vurderer netfølgende invertere (vekselrettere), dvs. enheder der synkroniserer sig til den eksisterende netspænding i stedet for selv at danne den, til et mikronet med vindkraft, solceller (PV) og batterilager. Der udvikles en energibaseret model, som beskriver samspillet mellem produktion, lager og forbrug. Med udgangspunkt i modellen implementeres netfølgende reguleringsstrukturer for vind- og solinvertere i MATLAB/Simulink og afprøves i simulation. Evalueringen ser på, hvor godt inverterne følger referencer for aktiv effekt (referencesporing), strømreguleringens opførsel og elkvalitet, med særlig fokus på strømreferencesporing og harmonisk forvrængning (målt som total harmonisk forvrængning, THD). Resultaterne viser stabile dynamiske egenskaber og lav stationær fejl ved effektreferencesporing. De leverede strømme forbliver balancerede og tæt på sinusformede, og THD ligger inden for almindeligt accepterede grænser. Et begrænset sæt HIL-tests (hardware-in-the-loop) giver indledende indsigt i praktiske implementeringsforhold.
Microgrids are small, local electricity networks that combine sources like wind and solar with storage. They use power electronic converters to connect these resources in a controlled, reliable way. This project designs and evaluates grid-following inverters—devices that synchronize to the existing grid voltage rather than forming it—for a microgrid with wind power, photovoltaic (PV) generation, and battery energy storage. An energy-based model is built to describe how generation, storage, and loads interact. Based on this model, grid-following control structures for the wind and solar inverters are implemented in MATLAB/Simulink and tested in simulation. The assessment looks at how well the inverters follow active power setpoints (reference tracking), how the current controllers behave, and overall power quality, with a focus on current reference tracking and harmonic distortion (measured as total harmonic distortion, THD). The results show stable dynamics with low steady-state error when tracking power references. The currents injected into the microgrid remain balanced and close to sinusoidal, and THD stays within commonly accepted limits. A small set of hardware-in-the-loop (HIL) tests provides initial insight into practical implementation.
[This summary has been rewritten with the help of AI based on the project's original abstract]
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