Abstract
With an increasing share in energy production, wind turbines have to fulfill strict grid requirements to support the grid in case of discontinuities. Here LVRT (Low Voltage Ride Through) compliance is one essential part, where the turbine has to stay connected to the grid in case of voltage drops and is not allowed to stop. This paper comprises measured low-voltage events from an LVRT campaign with a focus on the mechanical loads for the drivetrain and tower during these temporary and instant drops of power. Moreover, we analyze the turbine operation itself, like the rotational speed, which is essential to keep the turbine within its operational parameters and design limits.
Highlights
Renewable energies play a central part in the transition to more sustainable energy production
The LVRT requirements have become more demanding in terms of voltage dip depth and duration, and even voltage drops to zero have become part of the requirement for some grid codes
For the evaluation of the mechanical loads and the turbine operation we focus on the following items: 1
Summary
Renewable energies play a central part in the transition to more sustainable energy production. 2019 [1] a power return to 90% is required within one second after voltage comeback This trend of more challenging LVRT scenarios is potentially a design driver for the turbines. Acceleration of rotor speed and imminent over-speed due to drivetrain oscillations drivetrain torque loads at the High-speed-shaft (HSS) These three issues appear as most sensitive and critical for the turbine during and right after LVRT events. The structure of this publication is as follows: In Section 2, we will give background information about the measurement campaign itself and present final results for rotor speed, drivetrain torque, and tower oscillations in a summarized way for the whole set of LVRT scenarios. The results shown in this publication demonstrate the feasibility of DFIG based wind turbines to cope with modern grid codes and in parallel point to the most critical elements in turbine design which may become the bottleneck for compliance to upcoming grid codes
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