Influence of the ICFF decoupling technique on the stability of the current control loop of a grid-tied VSC
Document typeConference report
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Rights accessOpen Access
European Commission's projectFLEXITRANSTORE - An Integrated Platform for Incresed FLEXIbility in smart TRANSmission grids with STORage Entities and large penetration of Renewable Energy Sources (EC-H2020-774407)
The control scheme of grid-tied converters is often implemented in the dq-frame due to simplicity of design. However, with this transformation, there exists an inherent cross-coupling term between the d-and q-channels which is often compensated for by using a feed-forward term in the current-control loop. It is shown, by applying the generalized Nyquist criterion (GNC) to the dq-frame ac impedance of the converter, that the inclusion of this decoupling term, in fact, degrades the stability of the controller when increasing the bandwidth of the synchronous reference frame phase-locked loop (SRF-PLL). Harware-in-the-loop (HIL) experiments are also conducted and verify these results.
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CitationMarín , L. [et al.]. Influence of the ICFF decoupling technique on the stability of the current control loop of a grid-tied VSC. A: IEEE Energy Conversion Congress and Exposition. "2019 IEEE Energy Conversion Congress and Exposition (ECCE)". Institute of Electrical and Electronics Engineers (IEEE), 2019, p. 2622-2628.
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