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

2 Citations (Scopus)


Inaccurate phase-angle jump estimation of the grid voltage during faults is one of the major causes for poor fault ride-through performance of converters. To overcome this issue and make the converter’s current controller robust, this paper 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 synchronous reference frame. The performance of the converter during both symmetrical and asymmetrical grid faults along with the fault ride-through 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 phase-angle jumps.
Original languageEnglish
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
Publication statusE-pub ahead of print - 27 Jan 2021


  • Estimation
  • Feedforward systems
  • Frequency estimation
  • Impedance
  • Phase locked loops
  • Power system stability
  • Synchronization
  • Voltage source converters
  • fault ride-through
  • grid faults
  • hybrid grid synchronization
  • phase-angle jumps
  • phase-locked loop


Dive into the research topics of 'Enhanced fault ride-through of power converters using hybrid grid synchronization'. Together they form a unique fingerprint.

Cite this