Connecting wind turbines to the public power grid poses significant challenges for manufacturers. It is not just about testing the functionality of the turbines but also ensuring they comply with the electrical properties’ limit values specified in the connection rules. Moreover, dynamic events such as short circuits and frequency fluctuations need to be accounted for. Manufacturers must go through a series of tests and certification procedures to receive their unit certificate, as power grids are intricate systems that require each turbine to contribute to stability.
As wind turbines are growing in both output and size, traditional test systems are becoming inadequate to determine whether new turbines meet the required standards. This issue is particularly prevalent in the case of large offshore wind turbines. To address this challenge, the Fraunhofer Institute for Wind Energy Systems IWES has been working on the Mobil-Grid-CoP project. This project focuses on developing a mobile test platform capable of conducting realistic tests on even the largest offshore wind turbines.
The mobile test platform developed by Fraunhofer IWES allows for testing of wind turbines up to an output of 28 megavolt-amperes (MVA). With a focus on large offshore turbines, the test bench is designed for the typical offshore voltage level of 66 kV. This enables manufacturers to obtain certification more efficiently. The test system acts as a grid emulator, simulating the electrical behavior of the power grid to the test object without compromising the public grid.
Mobil-Grid-CoP offers several advantages to the wind energy sector. Manufacturers can conduct robust, realistic, and detailed tests on their prototypes to ensure they are certification-ready. This reduces the risk of rework before turbine operation and accelerates the certification and commissioning process. The test bench also allows for easy retrospective upgrades or modernization measures on turbines. Additionally, the flexible setup of the facility enables integration with other test benches for infrastructure expansion purposes.
Fraunhofer IWES aims to develop a technology platform through Mobil-Grid-CoP that facilitates scenario-based, flexible testing of wind turbines. With the rapid transition to renewable energy, new connection rules may emerge in the future. The project ensures preparedness for evolving standards and regulations in the renewable energy sector. By contributing to the transition of energy grids to renewable sources, Fraunhofer IWES is playing a vital role in driving the shift towards sustainable energy solutions.
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