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Delegates are invited to meet and discuss with the poster presenters in this topic directly after the session 'Advanced drive trains technologies' taking place on Tuesday, 11 March 2014 at 16:30-18:00. The meet-the-authors will take place in the poster area.

Miron Janic SET, Austria
Co-authors:
Miron Janic (1) F P Sasa Bukovnik (2)
(1) SET, Klagenfurt, Austria (2) AVL, Graz, Austria

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Presenter's biography

Biographies are supplied directly by presenters at EWEA 2014 and are published here unedited

Mr. Janic is a Senior Analysis Engineer responsible for Multi-Body-System simulations and structural calculation tasks in the development process of a new differential gearbox for wind-power turbines. After finishing his studies in mechanical engineering in 1991, he advanced his career as a developer of different drivetrain systems at Volvo Penta and Volvo Truck Corp in Gothenburg, Sweden, GM in Detroit, US and AVL List, Austria.
The main part of his work over the last 12 years covers simulations of advanced dynamical systems and within the last 4 years his focus is on Wind Turbines at SET, Klagenfurt.

Abstract

Management demand: first-time-right a new drive-train technology development based on a virtual model approach

Introduction

The German Transmission Code 2007 distinguishes between Type-1 and Type-2 generating units. Type-1 is a synchronous generator directly connected to the power grid whereas the widely established systems today such as DFIG and PMG-FC are Type-2 units.
Type-1 systems have many advantages like behaviour during a voltage drop, providing reactive power, availability of grid inertia and small amount of harmonics. These are very important for the power utilities to guarantee a stable power grid.
All these benefits are the motivation for developing a drive-train which makes it possible to use synchronous generators in Wind Turbines (WT).

Approach

DSgen-set® System as “Type-1”generating unit:

-The company SET from Klagenfurt has been developing a drive-train concept with a separately excited medium-voltage synchronous generator (MVSG) combined with an electro-mechanical differential system for a nominal power rating over 2MW. It is named DSgen-set®.
The system consists of a planetary gear stage which enables the constant speed of the synchronous generator, while the generated active power is controlled by a servo.

This paper presents some of the interesting results and methods of the Virtual Model (VM) approach, which were used during the 2MW DSgen-set® development and its implementation on a WT.


Main body of abstract

DSgen-set® is a modular built system which demonstrates the best capabilities in the range from 2MW up to 7MW. In the development of this new technology, considerable efforts were made early in the concept phase. The system design was steadily improved and simultaneously evaluated through VM analysis. The result of this development process is an optimized design of 2MW DSgen-set®, which is produced as a prototype. The SET testing facility is capable of testing the prototype in every detail. The test results of 2MW DSgen-set® were compared with the VM results in order to validate the applied VM approach. A splendid correlation was achieved which increased confidence in the VM method and results.

In the next step the complete WT was prepared as a VM. The same modeling method, which is applied and validated for the DSgen-set®, was used for the other components of the WT including the Main Gearbox. The VM was further extended with electro-mechanical components and automatic control.
With such an advanced VM that considers all known dynamical impacts on the WT, further development of mechanical design, electrical engineering and automatic control requirements is supported in a very efficient way.

The approach to use a Multi-Body System (MBS) together with co-simulations of electrical system components and controlling system, in order to model the physical relations and interactions of the entire WT, is an established methodology and an important part of the development processes in SET.

Conclusion

Considering the demand for “first-time-right” and having a possibility to implement state of the art MBS software that works in co-simulation with the controlling system, represents a key factor in the development process of new drivetrains for WT.
An additional benefit of the VM approach is that it covers all requirements necessary for certification purposes of the DSgen-set®, together with the complete WT drivetrain, in accordance to the GL guidelines.


Learning objectives
Furthermore, the paper illustrates that the virtual MBS is a powerful tool to shorten the development time.
Finally it emphasizes the crucial importance of a deep understanding of the complete system in the early development phase. Therefore a successful development will result in a gain on the market by being first-time-right.