Abstract
This paper presents a novel direct power controlled dual stator-winding induction generator (DWIG) system. The voltage control mechanism of the DWIG is analyzed, based on which the influence of the control winding instantaneous power on the output dc voltage is disclosed. The strategy of the direct power control (DPC) for the DWIG is proposed. No inner current loops and no PWM modulator block are required. Fast control on the control winding instantaneous power is achieved, because the required voltage on the control winding, which restricts the active and reactive power errors into a certain band, is directly selected from an optimal switching table (OST) within each working period. Detailed theoretical analysis for the derivation of the OST in the DPC controlled DWIG system is presented. Experimental results on an 18kW DWIG system are provided to demonstrate the effectiveness and robustness of the proposed control strategy during the variation of rotor speed and output power.
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