Enhanced Interpolated Dynamic DFT Synchrophasor Estimator Considering Second Harmonic Interferences†
Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
Department of Engineering, Durham University, DH1 3LE Durham, UK
Author to whom correspondence should be addressed.
This manuscript is extension version of the conference paper: Chen, L.; Zhao, W.; Yu, Y.; Wang, Q.; Huang, S. Improved Interpolated Dynamic DFT Synchrophasor Estimator Considering Second Harmonic Interferences. In Proceedings of the 2018 IEEE International Instrumentation and Measurement Technology Conference, Houston, TX, USA, 14–17 May 2018; pp. 1–6.
Received: 17 July 2018 / Revised: 12 August 2018 / Accepted: 18 August 2018 / Published: 21 August 2018
PDF [1069 KB, uploaded 31 August 2018]
In the future, phasor measurement units are expected to be applied in distribution networks (DNs) for their control and monitoring. Because of the widely used power electronic devices in DNs, harmonics are widely present in a voltage/current signal. Particularly, second harmonics have the most significant uncertainty contributions to synchrophasor estimation, which is especially true when a short cycle observation window is used for a fast response. Based on the interpolated dynamic discrete Fourier transform (IpD
FT), this paper introduces an enhanced IpD
FT) synchrophasor estimator that considers second harmonic interferences. First, the adaptive equivalent filters of the IpD
FT are given. Based on these, the optimal frequencies where the IpD
FT has the least second harmonic interferences are then searched using an enumeration method, and the e-IpD
FT synchrophasor estimator is accordingly proposed. Instantaneous frequency responses and several simulation tests show that the e-IpD
FT performs much better than the IpD
FT in second harmonic suppression, and can meet the P-class response time requirements and most of the M-class accuracy requirements of the IEEE standard C37.118.1 only over a three-cycle window.
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MDPI and ACS Style
Chen, L.; Zhao, W.; Wang, F.; Wang, Q.; Huang, S. Enhanced Interpolated Dynamic DFT Synchrophasor Estimator Considering Second Harmonic Interferences. Sensors 2018, 18, 2748.
Chen L, Zhao W, Wang F, Wang Q, Huang S. Enhanced Interpolated Dynamic DFT Synchrophasor Estimator Considering Second Harmonic Interferences. Sensors. 2018; 18(9):2748.
Chen, Lei; Zhao, Wei; Wang, Fuping; Wang, Qing; Huang, Songling. 2018. "Enhanced Interpolated Dynamic DFT Synchrophasor Estimator Considering Second Harmonic Interferences." Sensors 18, no. 9: 2748.
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