Abstract：Many reasons, such as power system load changes, sub-synchronous resonance and so on, will cause the system frequency to deviate from the nominal frequency of the system. The maximum frequency deviation specified in IEEE standard C37.118.1 and the latest revised C37.118.1a can reach 5Hz and larger frequency deviation will cause Taylor-Fourier to produce serious analysis errors. This paper proposed a dynamic synchronous phasor estimator considering frequency deviation. In this estimator, multiple discrete frequencies were generated at fixed frequency intervals on both sides of the nominal frequency, and then the corresponding dynamic filters were generated offline based on these frequencies, and the filter coefficients were saved to the memory for use during online operation. When the algorithm was running, Taylor-Fourier was used as a frequency detector to predict the signal frequency, and the closest discrete frequency was selected according to the predicted frequency. Then, the corresponding filter was found through the lookup table method to analyze the input signal and accurate measurement of synchronous phasor was realized under the frequency deviation case. Finally, the proposed estimator was tested through simulation and actual signal data. Test results show that the estimator can estimate the synchrophasor, frequency and rate of change of frequency under frequency deviation conditions.
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2021, Vol. 36 
