| Electrical & Electronic Engineering |
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| Dynamic modeling and direct power control of wind turbine driven DFIG under unbalanced network voltage conditions |
| Jia-bing HU, Yi-kang HE, Lie XU |
| School of Electrical Engineering, Zhejiang University, Hangzhou 310027, China; Department of Electronics and Electrical Engineering, University of Strathclyde, Glasgow G4 0PG, UK |
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Abstract This paper proposes an analysis and a direct power control (DPC) design of a wind turbine driven doubly-fed induction generator (DFIG) under unbalanced network voltage conditions. A DFIG model described in the positive and negative synchronous reference frames is presented. Variations of the stator output active and reactive powers are fully deduced in the presence of negative sequence supply voltage and rotor flux. An enhanced DPC scheme is proposed to eliminate stator active power oscillation during network unbalance. The proposed control scheme removes rotor current regulators and the decomposition processing of positive and negative sequence rotor currents. Simulation results using PSCAD/EMTDC are presented on a 2-MW DFIG wind power generation system to validate the feasibility of the proposed control scheme under balanced and unbalanced network conditions.
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Received: 18 April 2008
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