Improved synchrophasor measurement to capture sub/super-synchronous dynamics in power systems with renewable generation

• Published in: IET renewable power generation Vol. 13; no. 1; pp. 49 - 56
• Main Authors: Xie, Xiaorong, Zhan, Ying, Liu, Huakun, Liu, Chun
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 07.01.2019
• Subjects: adaptive frequency detection; classic DFT‐based method; compensation; control centre; data centre; discrete Fourier transforms; electric power generation; fast response; fundamental components; fundamental subsynchronous harmonic phasors; fundamental synchrophasors; improved synchrophasor measurement; interharmonic components; local PMUs; modal filtration; multiple super‐synchronous harmonic phasors; noise immunity; phasor compensation; phasor correction; phasor measurement; power system harmonics; power system stability; power systems; precise measurement; renewable generation; simultaneous measurement; Special Issue: Oscillations in Power Systems with High Penetration of Renewable Power Generations; SSR‐SSO; subsynchronous oscillation; subsynchronous resonance; super‐synchronous dynamics; super‐synchronous oscillation; super‐synchronous resonance; WAMS; wide‐area measurement system; adaptive frequency detection; fast response; subsynchronous oscillation; classic DFT-based method; interharmonic components; fundamental synchrophasors; super-synchronous dynamics; noise immunity; phasor compensation; WAMS; improved synchrophasor measurement; control centre; precise measurement; power system harmonics; power system stability; discrete Fourier transforms; simultaneous measurement; electric power generation; wide-area measurement system; fundamental components; data centre; modal filtration; phasor correction; subsynchronous resonance; multiple super-synchronous harmonic phasors; renewable generation; fundamental subsynchronous harmonic phasors; SSR-SSO; super-synchronous resonance; compensation; power systems; phasor measurement; local PMUs; super-synchronous oscillation
• ISSN: 1752-1416; 1752-1424; 1752-1424
• DOI: 10.1049/iet-rpg.2018.5533

The existing phasor-measurement unit (PMU) and wide-area measurement system (WAMS) based on the fundamental synchrophasors are insufficient to accurately capture the dynamics of sub/super-synchronous resonance or oscillation (SSR/SSO). To address this issue, this study proposes a new method for the simultaneous and precise measurement of the fundamental and multiple sub/super-synchronous harmonic phasors. It improves the classic discrete Fourier transform (DFT)-based method by adding adaptive frequency detection, modal filtration and phasor correction and compensation. Thus, in the context of SSR/SSO, the phasors of both fundamental and interharmonic components can be precisely obtained at local PMUs and the control/data centre of WAMS. The basic procedures and the prototype implementation of the method have been elaborated, and the performance has been examined with simulation signals as well as the field data recorded from an actual SSO incident. The results have verified its high precision, noise immunity and fast response.