A Phasor Estimation Algorithm Robust to Decaying DC Component

Haotian Yu, Zongshuai Jin, Hengxu Zhang, Vladimir Terzija

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Phasor measurement is widely used in fault detection and locali-zation of power systems. To improve the phasor measurement accuracy when the fault signal contains the decaying dc compo-nent (DDC), this paper proposes a half-cycle DFT (HCDFT)-based phasor estimation algorithm. The error caused by DDC is estimated and removed from the phasor estimate by combining multiple HCDFT results that are computed using both the con-ventional basis vector and its corresponding complex conjugate. Both the numerical tests and the IEEE 39-bus system simulation tests are implemented to evaluate the performance of the pro-posed algorithm in comparison with four related phasor estima-tion algorithms. Test results show that the proposed algorithm can achieve accurate phasor estimation in the presence of DDC of a wide range of time constants under the interference of harmon-ics and noise. Moreover, the proposed algorithm is computation-ally efficient and its performance is independent of sampling rate. These merits make the proposed algorithm suitable to be applied in measurement and protection devices in real power systems.

Original languageEnglish
JournalIEEE Transactions on Power Delivery
Publication statusPublished - 2021
Externally publishedYes


  • Decaying dc component
  • Discrete Fourier transforms
  • Estimation error
  • Filtering algorithms
  • full-cycle DFT
  • halfcycle DFT
  • Harmonic analysis
  • phasor estimation
  • Power harmonic filters
  • Power measurement
  • Power systems


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