Abstract
A sliding-mode direct power control (SMDPC) strategy using second-order generalised integrator (SOGI) for doubly fed induction generator is proposed, which can achieve various objectives without the decomposition process of negative and positive sequence components when the grid voltage is unbalanced. The impact of the non-ideal grid voltage to the SM controller is studied, and an improved strategy is proposed by combining an SOGI-based compensator with the SMDPC strategy. Different control targets can be achieved by selecting different variables as the compensation. Experimental studies based on the proposed and traditional SMDPC are implemented to verify that the proposed strategy is effective when the grid voltage is unbalanced.
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