PMU-based Harmonic Phasor Calculation and Harmonic Source Identification

With the generalization and application of PMUs, the approach of the measurement and calculation for the electrical parameters in power grid are greatly enriched. But at present, PMU can only calculate the fundamental phasor and the utilization ratio of hardware resources is low. Firstly, based on the calculation principle of PMU for fundamental phasor calculation, the algorithm of PMU to calculate harmonic phasor is proposed. Secondly, the accuracy of harmonic phasor calculated by PMU and harmonic phasor calculated by conventional Fast Fourier Transform (FFT) is compared when the signal frequency deviates from the rated frequency. Thirdly, the harmonic phasors calculated by PMU and conventional FFT are used for harmonic contribution determination (HCD). The feasibility of harmonic phasor calculated by PMU on improving the accuracy of HCD is analyzed based on the case study results. Finally, the effectiveness of the proposed method is verified based on 18-bus distribution system. The case-study results show that the accuracy of the proposed method is good. The harmonic phasor data calculated by PMU is of great value for improving the accuracy of HCD.