Leith, D. J. and Leithead, W.E.
Performance enhancement of wind turbine power regulation by switched linear control.
International Journal of Control.
Power regulation of horizontal-axis grid-connected up-wind constant-speed pitch-regulated wind turbines
presents a demanding control problem with the plant, actuation system and control objectives all strongly
nonlinear. In this paper a novel switched linear approach is devised. Conventional linear control and a
nonlinear controller which, in some sense, optimises performance across the operating envelope provide
benchmarks against which the switched control strategy is compared. In comparison with conventional
linear control, the switched linear strategy reduces the peak power excursions experienced and the time spent
at high power levels, with a consequent reduction in drive-train loads. It achieves very similar performance
to the more complex nonlinear controller; that is, the performance is near optimal over the operational
envelope. Moreover, in contrast to nonlinear control it admits straightforward, rigorous analysis and permits
direct exploitation of the knowledge and experience accumulated with linear control. Hence, switched linear
control is more suited for application to wind turbines than the nonlinear control strategy. The improvement
in performance, in comparison to conventional linear control, is substantial.
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