Mechanical Load Analysis of PMSG Wind Turbines in Primary Frequency Regulation

摘要

As the level of wind power penetration increases, wind turbines can help overcome grid frequency dips and reduce maximum frequency deviations taking part in primary frequency response. This paper analyzes the structural loads of wind turbines when they are performing Active Power Control (APC) for primary frequency regulation. A model of the wind turbine defined in the 'Upwind' European project completed with a detailed model of a PMSG electrical machine is considered in GH Bladed. A collective pitch angle and generator torque H_∞ robust controllers of the wind turbine are augmented with a droop curve and an active power control system in order to allow the frequency regulation in addition to track active power set-points required by the grid operator. The PMSG wind turbine works with a defined reserve power capability in order to supply it when needed. This paper focuses on the analysis of the mechanical loads induced when primary frequency regulation is performed, analyzing as well the best power transition ways from the point of view of the loads, but considering as well frequency response transients.