Renewable park control
Author
Poulsen, Mikkel Lysgaard
Term
4. term
Education
Publication year
2020
Submitted on
2020-05-30
Pages
58
Abstract
This thesis addresses the design and tuning of a renewable park controller (RPC) to coordinate a hybrid power plant comprising wind turbines, photovoltaics, and a power‑to‑hydrogen unit (60 MW with 10 MW electrolysis), with emphasis on active power and frequency control in line with Danish grid codes. The system is modeled using a Thevenin equivalent for the grid (SCR and XR), π‑models for cables, and first‑order transfer functions for generation units to enable classical control design. A PI‑based RPC that measures active power at the PCC and compensates for network losses is developed and tested in MATLAB under varying operating and grid conditions (changes in grid voltage, SCR/XR, and electrolyser operation) to assess robustness and disturbance rejection. Two dispatch strategies are explored to maximize available power: proportional allocation and a wind‑turbine stress‑minimizing approach. The plant’s frequency support, including interactions with the electrolyser, is analyzed, and continuous controllers are discretized (with compared methods) and fine‑tuned for implementation without production disturbances. Results indicate that the PI‑based RPC can track active power setpoints, provide frequency response under steady‑state conditions, and comply with relevant Danish grid requirements, while both dispatch strategies are feasible with different trade‑offs between power utilization and wind turbine loading.
Dette speciale undersøger, hvordan en fornybar parkcontroller (RPC) kan designes og tunes til at koordinere en hybrid kraftpark bestående af vindmøller, solceller og et power‑to‑hydrogen‑anlæg (60 MW med 10 MW elektrolyse) med fokus på aktiv effekt og frekvensregulering i overensstemmelse med danske netkoder. Systemet modelleres med en Thevenin‑ækvivalent for nettet (SCR og XR), kabler som π‑modeller og produktionsenheder som førsteordens overføringsfunktioner for at muliggøre klassisk regulering. En PI‑baseret RPC, der måler aktiv effekt i PCC og kompenserer for nettab, udformes og testes i MATLAB under forskellige drifts- og netbetingelser (ændret netspænding, SCR/XR og elektrolyseproduktion) for at vurdere robusthed og forstyrrelsesafvisning. To dispatchstrategier undersøges for at maksimere udnyttelsen af tilgængelig effekt: proportional fordeling og en strategi, der begrænser mekaniske belastninger i vindmøller. Frekvensbidrag fra anlægget og interaktion med elektrolyse belyses, og kontinuerte regulatorer diskretiseres (med sammenlignede metoder) og finjusteres for implementering uden produktionsforstyrrelser. Resultaterne indikerer, at den PI‑baserede RPC kan spore aktiveffekt‑setpunkter, levere frekvensrespons under stationære forhold og overholde relevante danske netkrav, mens begge dispatchstrategier er mulige med forskellige kompromiser mellem effektudnyttelse og belastning af vindmøller.
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