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Information about DEWI Magazin49_Ingeteam_INGECON WIND FIX2VAR SPEED

Published on October 3, 2016

Author: anneleenvdbr


1. UL International GmbH,Wilhelmshaven, Germany Windenergie Wind energy Énergie Éolienne energia eólica ernergía eólica 02|2016

2. 6 ENGLISH Case Study: Conversion System for the Transformation of NM52 Fixed Speed Wind Turbine to Variable Speed The transformation of a fixed speed wind turbine to a vari- able speed topology through the installation of an auton- omous conversion system enables to maximize the Return on Investment (RoI) of the wind turbine. If an autonomous power converter, INGECON WIND FIX2VAR SPEED solution, is installed in the turbine obtaining a fully integrated and compatible solution, then: • The original electrical generator and wind turbine PLC are kept, thus minimizing the investment in the trans- formation to a full converter variable speed topology. • The optimal T(Ω) curve for each location (wind farm) is programmed, thus maximizing the return on investment. In addition to the specific advantages of the INGECON WIND FIX2VAR SPEED developed by Ingeteam Power Tech- nology (IPT), the transformation to a variable speed topol- ogy facilitates the following: • The energy density of the wind turbine is maximized since the system obtains the optimum Cp (power coefficient) in a wide range of wind speeds inside the Maximum Power Point Tracking (MPPT) regime (below rated) and thus obtaining an increment in the annual energy production (ΔAEP). • The LTE (Lifetime Extension) and Levelized Cost of Energy (LCoE) are maximized due to the reduction of mechanical torque steps in the drive train caused by wind gusts, of transients in the start-up of the tur- bine, of abrupt changes of the generator’s speed and of transients in emergency stops and grid conditions variations. • The grid quality is improved since flicker effect is avoided, low frequency harmonics generated by the capacitor banks are removed, power factor regulation is made possible and compliance with all grid codes is ensured. EXTERNAL ARTICLE Fig. 1: Thermal characterization of generator and validation of solution at Indar test bench

3. 7DEWI magazin | AUGUST 2016 This INGECON WIND FIX2VAR SPEED has been installed in a Neg Micon NM52 in order to transform it to variable speed. The transformed wind turbine, already commis- sioned, is the system under study, highlighting the most important achievements obtained during the project. Firstly, the thermal characterization of the generator in Fixed Speed and Variable Speed conditions was carried out at IPT facilities, specifically at Indar’s full load test bench, achieving an optimal variable speed solution. As a result of this characterization, an algorithm was cre- ated that ensures the maximum temperature of the HS of the generator (bearings, windings and magnetic core) is not exceeded for all operating points under repowering conditions. Later, the negative effects of the power electronics systems due to the high frequency switching and the common mode voltage applied were solved by including modified switching patterns and a common mode filtering solution. This was implemented inside the INGECON WIND FIX2VAR SPEED, thus avoiding the inclusion of external elements in the global solution and guaranteeing the reliability of all components in the system (generator, transformer, pumps, auxiliaries…), working as an autonomous power converter. From the point of view of the main wind turbine control- ler (TOI), the solution implemented ensures the correct operation of both without any effect to the original safety chain of the NM52 turbine. The global solution consists in installing the INGECON WIND FIX2VAR SPEED connected to the high speed generator using the original power cable and keeping the soft starter and contactor modules of the original solution in flotation. The low speed generator power cable is grounded at both ends and the generator bearings must be replaced for insulated ones. As part of the collaboration with UL-DEWI in the project, the aerolastic model of the wind turbine was created and validated through onsite real measurements performed Carlos Gironés Ingeteam, Spain Fig. 2: CM currents with the typical PES (left) and CM currents achieved in the NM52 (right)

4. 8 with the fixed speed configuration in operation. Two main keystones of the project are made possible by this vali- dated aerolastic model. On one side, the aerodynamic val- idation of the model, which is performed by comparison of the power curve, enables the obtaining of the Cp char- acteristic of the wind turbine, thus making it possible for the calculation of the optimal torque-speed curve to be implemented in each case (windfarm). On the other side, the structural validation of the model, which is performed by mechanical measurements, allows for the calculation of the RUL (Remaining Useful Life) and LTE (Lifetime Exten- sion) values of the wind turbine under the case (wind farm) conditions. Currently, IPT team is working on the simulation and char- acterization of the Variable Speed configuration already operating onsite under various control strategies (modifi- cations of torque-speed curve) in order to obtain all pos- sible scenarios that will minimize the investment maxi- mizing the return on investment for each given case (wind farm). Fig. 4: Power curve (top-left), Cp (top-right), structural validated simulations Fig. 5: Part of the IPT team working in the project Fig. 3: Global solution installed in a NM52 turbine

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