Wind turbine manufacturers are faced with the challenge of connecting new turbines to public power grids while ensuring grid stability is not compromised. Compliance with technical guidelines and certification procedures is essential to validate the performance of wind turbines and support the transition to renewable energy sources. The Mobil-Grid-CoP project, conducted by researchers at the Fraunhofer Institute for Wind Energy Systems IWES, has introduced a mobile test platform that enables realistic and comprehensive testing of wind turbines, even those located offshore.
The Challenge of Grid Connection
Connecting wind turbines to public power grids involves more than just functional testing; manufacturers must also adhere to specific limit values for electrical properties and be able to handle dynamic events such as short circuits and frequency fluctuations. The complexity of power grids necessitates thorough testing and validation of wind turbines to ensure grid stability. As wind turbines continue to increase in size and output, conventional test systems are struggling to keep up with the testing requirements, particularly for large offshore wind turbines.
The Mobile Test Platform
The Mobil-Grid-CoP project has developed a mobile test bench capable of testing wind turbines up to an output of 28 megavolt-amperes (MVA), including large offshore turbines. The test bench is designed to operate at the typical offshore voltage level of 66 kV, allowing for realistic testing conditions at full load. This grid emulator simulates the behavior of the power grid to analyze the wind turbine’s response to frequency changes, voltage fluctuations, and grid faults in real-time. The ability of the wind turbine to support the grid during events such as short circuits is crucial for obtaining certification.
The mobile test platform offers several advantages for the wind energy sector. Manufacturers can conduct robust and detailed tests on their prototypes to ensure compliance with certification requirements, reducing the risk of rework before commissioning. The test bench also facilitates upgrades and modernization measures on existing turbines, making it a versatile tool for wind turbine developers. Additionally, the flexibility of the mobile test facility allows for integration with other test benches, providing a comprehensive testing solution for wind turbines.
The Mobil-Grid-CoP project aims to develop a technology platform that supports scenario-based and flexible testing of wind turbines to adapt to evolving connection rules in the renewable energy sector. By staying ahead of regulatory changes, researchers at Fraunhofer IWES are contributing to the acceleration of the energy grid transition to renewable sources. The innovative approach to wind turbine testing not only streamlines the certification process but also ensures the reliability and efficiency of wind energy systems in the future.
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