Characterisation of Electrical Loading Experienced by a Nacelle Power Converter - (PPT)

摘要

The reliability of fully rated converters (FRC) in permanent magnet synchronous generator (PMSG) wind turbines is critical. A drive train model has been constructed to simulate the current throughput of the power modules in the FRC in response to a variety of isolated wind speed conditions and simulated wind speed profiles to explore potentially damaging operating conditions. The drive train model is based on a 2MW, PMSG, direct-drive, FRC wind turbine. The mechanical drive train is modelled as a 2-mass model. The machine-side converter (MSC) was parameterised using a Semikron converter. The turbine was controlled via maximum power point tracking (MPPT) and active pitch control. The results revealed that the turbine inertia and control decoupled the wind and current profiles. Pitch control overshoot leads to long term current variation even when operating at above rated wind speed. Therefore the wind speed cannot be used to directly derive the MSC currents. Instead the detailed wind turbine drive train model presented is required for MSC current simulation. With this current response, detailed simulation and analysis of the MSC thermal loading is possible. The turbine can now be emulated in an experimental rig using an AC power supply to provide realistic operating conditions.