Impact of Reactive Current and Phase-Locked Loop on Converters in Grid Faults

Ziqian Zhang () and Robert Schuerhuber
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Ziqian Zhang: Institute of Electrical Power Systems, Graz University of Technology, 8010 Graz, Austria
Robert Schuerhuber: Institute of Electrical Power Systems, Graz University of Technology, 8010 Graz, Austria

Energies, 2023, vol. 16, issue 7, 1-20

Abstract: The precise control of output power by grid-connected converters relies on the correct identification and tracking of a grid voltage’s phase at the converter terminal. During severe grid faults, large disturbances cause the converter’s operating point to move away from the stable equilibrium point during normal operation. This leads to oscillations of both the active and reactive power fed into the grid. Using large-signal modelling, this study investigated the converter’s dynamic processes during and after such fault situations. The investigation considered the influence of the converter’s phase-locked loop (PLL), responsible for phase tracking, as well as that of the DC link on the converter-grid system, which has a major influence on the active power exchange with the grid. On this basis, this study also focused on the reactive current reference’s influence during and after fault clearing. Furthermore, an easily implementable strategy for reactive current injection, leading to minimum power oscillations, was presented. The results and the optimized strategies were validated via controller hardware-in-the-loop tests.

Keywords: transient stability; low-voltage ride through; phase-locked loop; phase portrait; domain of attraction; FRT; reactive current injection (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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