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A adaptive sliding mode observer was proposed for the speed identification of a sensor-less vector control system of doubly fed wind turbine. This strategy combines adaptive control with variable structure control, and selects the rotor currents as model outputs, and formulates a slide mode surface according current error to get speed observer expression. By using small signal model, the convergence...
This paper presents a novel vector control strategy for the doubly-fed induction generator (DFIG) based wind turbine during grid voltage dips or swells. The transient electromagnetic process of the DFIG during the grid fault is discussed in detail. An improved control scheme with the dynamic process of stator excitation current variation taking into account is presented. Besides, the main magnetic...
The single-to three-phase matrix converter is an array of controlled semiconductor switches that connects the single-phase source to the three-phase load directly. An analytic method, which is separation and link, is presented in this paper. Along with it, the operation strategy is obtained for the proposed matrix converter. To confirm the validity and feasibility of this strategy, the detailed analysis...
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