Drive-train characteristics of constant speed HAWT's: part II - simple characterisation of dynamics

The overall dvnamic behaviour and hence performance of a grid-connected constant speed horizontal-axis wind turbine is due to a combination of the structural dynamics, the drive-train and generator dynamics and, when appropriate, the control system dynamics. A dynamically well-behaved machine requires that the drive -train dynamics complement in some sense the other wind turbine dynamics . 1n this , the second part of a two part paper, the dependence of the drive-train dynamics on the values of the system parameters is investigated. Simple expressions for indicators of dynamic performance, which provide insight into and facilitate "tuning" of the drive-train dynamics, are derived. The analysis is relevant to almost all constant speed wind turbines, both pitch and stall regulated.