전력전자학회:학술대회논문집 (Proceedings of the KIPE Conference)
- 전력전자학회 2013년도 전력전자학술대회 논문집
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- Pages.244-245
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- 2013
Control Strategy Compensating for Unbalanced Grid Voltage Through Negative Sequence Current Injection in PMSG Wind Turbines
- Kang, Jayoon (Dept. of Elec. Eng., Chonbuk National University) ;
- Park, Yonggyun (Dept. of Elec. Eng., Chonbuk National University) ;
- Suh, Yongsug (Dept. of Elec. Eng., Chonbuk National University) ;
- Jung, Byoungchang (Power & Industrial Systems R&D Center, Hyosung Co.) ;
- Oh, Juhwan (Power & Industrial Systems R&D Center, Hyosung Co.) ;
- Kim, Jeongjoong (Power & Industrial Systems R&D Center, Hyosung Co.) ;
- Choi, Youngjoon (Power & Industrial Systems R&D Center, Hyosung Co.)
- 발행 : 2013.07.02
초록
This paper proposes a control algorithm for permanent magnet synchronous generator with a back-to-back three-level neutral-point clamped voltage source converter in a medium-voltage offshore wind power system under unbalanced grid conditions. The proposed control algorithm particularly compensates for the unbalanced grid voltage at the point of common coupling in a collector bus of offshore wind power system. This control algorithm has been formulated based on the symmetrical components in positive and negative rotating synchronous reference frames under generalized unbalanced operating conditions. Instantaneous active and reactive power are described in terms of symmetrical components of measured grid input voltages and currents. Negative sequential component of ac input current is injected to the point of common coupling in the proposed control strategy. The amplitude of negative sequential component is calculated to minimize the negative sequential component of grid voltage under the limitation of current capability in a voltage source converter. The proposed control algorithm makes it possible to provide a balanced voltage at the point of common coupling resulting in the generated power of high quality from offshore wind power system under unbalanced network conditions.
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