Enhanced fault ride-through of power converters using hybrid grid synchronization

Animesh Sahoo, Jayashri Ravishankar, Mihai Ciobotaru, Frede Blaabjerg

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Inaccurate phase-angle jump (PAJ) estimation of the grid voltage during faults is one of the major causes for poor fault ride-through (FRT) performance of converters. To overcome this issue and make the converter's current controller robust, this article proposes a hybrid grid synchronization transition technique. In this concept, a synchronous reference frame-based phase-locked loop (SRFPLL) grid synchronization method is used during normal grid operation and switched to an arctangent-based phase-angle estimation during grid faults. Simultaneously frequency estimation is switched to the arctangent derived frequency. A common transition method, which depends on the phase-angle error between the two-phase estimation techniques, is proposed to ensure a smooth transition between the hybrid phase-angle and frequencies. The transition technique is implemented using the current control of a three-phase voltage source converter in the SRF. The performance of the converter during both symmetrical and asymmetrical grid faults along with the FRT strategies is tested using real-time experiments. It is observed that the transition-based hybrid grid synchronization technique reduces the loss of synchronism duration. Additionally, it offers a more robust converter current control performance compared to the SRFPLL technique over a wide range of voltage sags and PAJs.

Original languageEnglish
Pages (from-to)2829-2841
Number of pages13
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
Issue number3
Early online date27 Jan 2021
Publication statusPublished - Jun 2022


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