Abstract
A direct current (DC) cluster-based wind farm collection network with permanent magnet generators and passive rectifiers is described and modelled. The ability of the generator speed to ‘slip’ from the cluster synchronous speed is discussed along with the relationship between the slip and generator stator inductances. An investigation of the harmonics present in the system highlights the presence of sixth harmonic torque and DC current components. Modelling of two and five turbine clusters indicates that the super position of the sixth harmonics produced by adjacent turbines, introduces a lower frequency harmonic components to both the DC current and generator torques. Modelling also highlights the presence of circulating current components flowing between the turbines, which give rise to both transient and steady-state interactions. Finally, the impact of increasing the branch inductances is studied and shown to affect the response of the machines following changes of wind speed.
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