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Dual Sequence Controller with Delayed Signal Cancellation in the Rotating Reference Frame

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posted on 13.12.2021, 22:17 by Daniel MotaDaniel Mota, Erick AlvesErick Alves, Elisabetta Tedeschi
Manuscript submitted to the Twenty-second IEEE Workshop on Control and Modeling for Power Electronics (COMPEL 2021).
Abstract: Dual-sequence current controllers of voltage source converters (VSCs) feature two separate rotating reference frames (RRFs), commonly named dq frames, and rely on techniques that isolate the positive and negative sequences of three-phase measurements. One of these techniques is the delayed signal cancellation (DSC). It is performed in the stationary reference frame (SRF), also known as αβ frame. The DSC combines old values of one axis with new values of the other axis of the SRF. The results are, then, transformed into the RRFs for use in the current controller. This filtering process introduces an extra layer of complexity for dual-sequence current controllers, which could otherwise operate solely in the RRFs. This paper introduces a frequency adaptive DSC method that operates directly in the RRF. Moreover, an averaging of two of the proposed DSC filters with contiguous integer delays is employed for reducing discretization errors caused by grid frequency excursions. A formal proof of the equivalence between the αβ and dq DSC methods is presented. Furthermore, computer simulations of a case study support the interpretation of the results.


“Research Centre for Low-Emission Technology for Petroleum Activities on the Norwegian Continental Shelf” (LowEmission), grant number 296207,

“Innovative Hybrid Energy System for Stable Power and Heat Supply in Offshore Oil & Gas Installation (HESOFF)” grant number 281986


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Norwegian University of Science and Technology (NTNU)

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