Systematische Bewertung der Akustik von getriebelosen Windenergieanlagen am Beispiel des elektromagnetischen Betriebsverhaltens des Generators

Mülder, Christoph; Hameyer, Kay (Thesis advisor); Schelenz, Ralf (Thesis advisor)

Düren : Shaker Verlag (2022)
Book, Dissertation / PhD Thesis

In: Aachener Schriftenreihe zur elektromagnetischen Energiewandlung 48
Page(s)/Article-Nr.: xiii, 252 Seiten : Illustrationen , Diagramme

Dissertation, RWTH Aachen University, 2022

Abstract

The proportion of electrical energy producers that use regenerative energy sources will increase steadily in the course of the energy transition. Onshore wind turbines are increasingly opening up inhabited areas. In this context, the acoustic emission represents an essential metric for the distance dimensioning and localization of the wind turbines. Standards and guidelines define specifications with regard to limit values that must be observed for field measurements as part of the certification. The aim of this work is to contribute to the systematic and efficient evaluation of the noise emissions of gearless wind turbines using the example of tonal magnetic noise caused by the generator. Various methods for modeling relevant phenomena are used for this purpose. Based on a new hybrid approach to magnetic field calculation, the above effects are analyzed and evaluated using a modally reduced structural dynamics model in an elastic multi-body simulation. The electrical current forms are determined on the basis of simulations of a numerical field-circuit coupling of the generator. Measurement results, which are collected on a 4 MW system test bench, are used for model validation and experimental analysis. The structure-borne noise behavior of the generator's stator structure is evaluated using exemplary individual effects and operation with different generator characteristics. The obtained systematics represents an analysis tool for comparing wind turbine concepts and in the design process for model-based product improvement. With the approach presented, the current standards and technical guidelines with regard to acoustics can be checked and evaluated.