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Decoupled Double Synchronous Reference Frame PLL for Power Converters Control

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6 Author(s)
Rodriguez, P. ; Dept. of Electr. Eng., Tech. Univ. of Catalonia, Terrassa ; Pou, J. ; Bergas, J. ; Candela, J.I.
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This paper deals with a crucial aspect in the control of grid-connected power converters, i.e., the detection of the fundamental-frequency positive-sequence component of the utility voltage under unbalanced and distorted conditions. Specifically, it proposes a positive-sequence detector based on a new decoupled double synchronous reference frame phase-locked loop (DDSRF-PLL), which completely eliminates the detection errors of conventional synchronous reference frame PLL's (SRF-PLL). This is achieved by transforming both positive- and negative-sequence components of the utility voltage into the double SRF, from which a decoupling network is developed in order to cleanly extract and separate the positive- and negative-sequence components. The resultant DDSRF-PLL conducts then to a fast, precise, and robust positive-sequence voltage detection even under unbalanced and distorted grid conditions. The paper presents a detailed description and derivation of the proposed detection method, together with an extensive evaluation using simulation and experimental results from a digital signal processor-based laboratory prototype in order to verify and validate the excellent performance achieved by the DDSRF-PLL

Published in:

Power Electronics, IEEE Transactions on  (Volume:22 ,  Issue: 2 )

Date of Publication:

March 2007

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