XU Sudi,YUAN Yubo,WANG Chenqing,et al.Mechanism Analysis and Suppression of PMU Fundamental Frequency Measurement Error Under Influence of Sub-/Super-synchronous Interharmonics[J].Automation of Electric Power Systems,2024,48(17):88-96.
XU Sudi,YUAN Yubo,WANG Chenqing,et al.Mechanism Analysis and Suppression of PMU Fundamental Frequency Measurement Error Under Influence of Sub-/Super-synchronous Interharmonics[J].Automation of Electric Power Systems,2024,48(17):88-96. DOI: 10.7500/AEPS20230923001.
Mechanism Analysis and Suppression of PMU Fundamental Frequency Measurement Error Under Influence of Sub-/Super-synchronous Interharmonics
The high proportion of renewable energy and power electronic equipment has generated a large number of sub-/super-synchronous interharmonics in the power grid
resulting in significant deviations in the fundamental frequency measurement of synchrophasor measurement unit (PMU)
which affects the effectiveness of various frequency applications. Therefore
the paper proposes a mechanism analysis and suppression method for fundamental frequency measurement error under the influence of sub-/super-synchronous interharmonics. Firstly
a frequency domain characteristic model of the frequency measurement algorithm is established
and based on this
a mathematical model of fundamental frequency oscillation under the influence of a single interharmonic and symmetrical sub-/super-synchronous interharmonics is derived
revealing the mechanism of fundamental frequency measurement error under interharmonic interference. Secondly
based on the oscillation behavior of frequency
a fitting model of multi-component superposition is established
and a short-time window frequency oscillation component suppression method based on Fourier transform and least squares method is proposed
which significantly reduces the fundamental frequency deviation. Finally
simulation and on-site recorded data test verify that the proposed method reduces frequency measurement errors greatly.
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