Date of Publication :7th November 2016

Abstract: The problem of controlling small-scale wind turbines providing energy to the grid is addressed in this paper. The overall system consists of a wind turbine plus a permanent magnet synchronous generator connected to a single-phase ac grid through a passive rectifier, a boost converter, and an inverter. The control problem is challenging for two reasons. First, the dynamics of the plant are described by a highly coupled set of nonlinear differential equations. Second, due to the use of a simple generator and power electronic interface, the control authority is quite restricted. In this paper we present a high performance, nonlinear, passivity-based controller that ensures asymptotic convergence to the maximum power extraction point together with regulation of the dc link voltage and grid power factor to their desired values.

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