Room:
Prandtl Hall
Topic:
J. Drive trains, generator technology and grids
Form of presentation:
Oral
Duration:
120 Minutes
16:30
New Drive Train Concept with Multiple High Speed Generators
Friederike Barenhorst | RWTH Aachen | Germany
Show details
Authors:
Friederike Barenhorst | RWTH Aachen | Germany
Simon Serowy | Germany
Cristian Andrei | Germany
Ralf Schelenz | Germany
Georg Jacobs | Germany
Kay Hameyer | Germany
An alternative 6 MW drive train configuration with six high-speed (n = 5000 rpm) permanent magnet synchronous generators for wind turbine generators (WTG) is designed. The gearbox for this drive train concept is assembled with a six fold power split spur gear stage in the first stage, followed by six individual 1 MW geared driven generators. Switchable couplings are developed to connect and disconnect individual geared generators depending on the input power. With this configuration it is possible to improve the efficiency during partial load operation, increasing the energy yield about 1.15 % for an exemplary low-wind site. The focus of this paper is the investigation of the dynamic behavior of this new WTG concept. Due to the high gear ratio the inertia relationship between rotor and generator differs from conventional WT concepts, possibly leading to intensified vibration behavior. Moreover there are switching procedures added, that might also lead to vibration issues.
16:50
Detailed Pseudo-Static Drive Train Modelling with Generator Short Circuit
Christopher Warnock | University of Strathclyde | United Kingdom
Show details
Authors:
Christopher Warnock | University of Strathclyde | United Kingdom
David Infield | United Kingdom
Drivetrain failures contribute significantly to wind turbine downtime. Although the root causes of these failures are not yet fully understood, transient events are regarded as an important contributory factor. Despite extensive drive train modelling, limited work has been carried out to assess the impact of a generator short circuit on the drivetrain. In most cases, a generator short circuit is classed as a failure in itself with minimal focus on the subsequent effects on the gearbox and other drivetrain components. This paper will look to analyse the loading on the drivetrain for a doubly fed induction generator (DFIG) short circuit event with turbine ride through using a combination of Simulink, Garrad Hassan's Bladed and RomaxWind drive train modelling software.
17:10
Converter Lifetime Assessment for Doubly-Fed Induction Generators Considering Derating Conrol Strategies at Low Rotor Frequenzies
Marcel Morisse | Leibniz Universität Hannover | Germany
Show details
Authors:
Marcel Morisse | Leibniz Universität Hannover | Germany
Arne Bartschat | Germany
Jan Wenske | Germany
Axel Mertens | Germany
In this paper, various control strategies around the synchronous operating point with the aim to reduce the thermal loading of the rotor-side converter in wind turbines equipped with doubly-fed induction generators are investigated regarding their assets and drawbacks. It is shown that there are various possibilities to prolong the lifetime expectation of the converter regarding its thermal stress by implementing these control strategies. However, every control measure requires a careful design process or a slight adjustment of the system to ensure a positive effect on the overall behaviour of the wind turbine.
17:30
Investigation on pitch system loads by means of an integral multi body simulation approach
Joerg Berroth | RWTH Aachen University | Germany
Show details
Authors:
Joerg Berroth | RWTH Aachen University | Germany
Tobias Kroll | Germany
Ralf Schelenz | Germany
Georg Jacobs | Germany
Abstract. In modern horizontal axis wind turbines blades are adjusted by three individual pitch systems to control power output. The pitch system consists of either a hydraulic or an electrical actuator, the blade bearing, the rotor blade itself and the control. In case of an electrical drive a gearbox is used to transmit the high torques that are needed for blade pitch angle adjustment. In this contribution a new integral multi body simulation approach is presented that enables detailed assessment of dynamic pitch system loads. The simulation results presented are compared and evaluated with measurement data of a 2 MW-class reference wind turbine. Major focus of the contribution is on the assessment of non linear tooth contact behaviour incorporating tooth backlash for the single gear stages and the impact on dynamic pitch system loads. Keywords. wind turbine simulation, pitch system, multi body simulation, gears, backlash