Design of a permanent magnet synchronous generator for small hydro power plants using finite element method and evolutionary optimization

U okviru ovog rada prikazan je postupak projektiranja sinkronog generatora s permanentnim magnetima za malu hidroelektranu snage 860 kVA. Prema istim nazivnim podacima projektirane su dvije različite izvedbe ovog stroja: s permanentnim magnetima na površini rotora, odnosno s permanentnim magnetima koji se nalaze u unutrašnjosti rotora. Najprije je proveden analitički proračun generatora s permanentnim magnetima na površini rotora uz pomoć programskog paketa Matlab, a zatim je isti generator modeliran pomoću metode konačnih elemenata u programskom paketu Mentor Graphics MagNet te su uspoređeni dobiveni rezultati. Nakon toga, u istom programskom paketu modeliran je generator s magnetima u unutrašnjosti rotora metodom konačnih elemenata pri čemu je izvođenje potpuno automatizirano programskim kodom napisanim u Matlabu. Opisan je postupak parametrizacije geometrije stroja, navedeni su detalji statorskog namota, osnovne postavke modela u MagNet-u te su prikazani najvažniji rezultati elektromagnetskog proračuna. Na kraju su određeni induktiviteti i ulančeni tok metodom zamrzavanja premeabilnosti te su pomoću njih izračunati izlazni parametri generatora i uspoređeni dobiveni rezultati.The paper describes the process of designing a synchronous generator with permanent magnets for a small hydropower plant rated 860 kVA. According to the same nominal data, two different types of this machine are designed: with permanent magnets on the surface of the rotor and with the permanent magnets in the interior of the rotor. First, the analytical calculation of the generator with permanent magnets on the rotor surface was performed by using the Matlab program package, and then the same generator was modeled using the finite element method in the Mentor Graphics MagNet program package and the results were compared. After that, in the same program package, the interior rotor magnet generator is modeled with the finite element method, where the execution is fully automated with the program code written in Matlab. The procedure for parameterizing the machine geometry is described, stator winding details are provided, basic model settings in MagNet are listed and the most important results of electromagnetic calculations are shown. Finally, inductance and flux linkage are determined by the frozen permeability method, the results of which are used to calculate the generator output parameters and that parameters are compared with previous results