A Control Method for Converter-interfaced Sources to Improve Operation of Directional Protection Elements

Zhe Yang, Zhou Liu, Qi Zhang, Zhe Chen, Jose de Jesus Chavez, Marjan Popov

Research output: Contribution to journalArticlepeer-review


The traditional fault control strategy of converter-interfaced renewable energy sources (CIRESs) may bring about a lower sensitivity level or misoperation of fault component-based directional elements. To overcome this problem, a new control scheme is proposed to adjust sequence impedance angles of CIRESs by computing suitable current references of the CIRES controller. Meanwhile, these current references are maximized by an iterative algorithm to make full use of the short-circuit capacity of CIRESs. The proposed control scheme is applicable to various faulty conditions such as different fault types, power factors, weak grids, and larger fault resistances. Compared with the new directional elements that need to update protection algorithms, the proposed control strategies can make CIRESs compatible with the existing directional elements whilst the necessary fault ride-through (FRT) requirements can still be satisfied. Furthermore, all the controller parameters are not required to be revised based on the detected fault type, even with only local measured data collected. The associated PSCAD simulations, real-time digital simulator (RTDS) testing and the downscale hardware experiment verify the proposed method.

Original languageEnglish
Pages (from-to)1-11
Number of pages11
JournalIEEE Transactions on Power Delivery
Publication statusE-pub ahead of print - 2022


  • Circuit faults
  • converter-interfaced renewable energy sources
  • directional elements
  • Fault currents
  • fault ride through
  • Impedance
  • impedance angle
  • Power transmission lines
  • Security
  • Voltage control
  • Voltage measurement


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