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Abstract
By analyzing the change of grid frequency during direct current(DC) ultra high voltage(UHV) faults this year, it is found that the use of conventional primary frequency control(PFC) technology in thermal power units cannot suppress the occurrence of extreme frequency of the power grid, and the conventional PFC method can no longer adapt to the frequency control of the power grid. By analyzing the control signals and control logic of the unit participating in the frequency regulation of the power grid, the PMU(phasor measurement unit) frequency signals that are closely connected to the power grid are introduced, and the second-order differential feed-forward is used to achieve overshoot compensation, which makes the frequency modulation action faster and more accurate, ensuring the power grid’s safe and stable operation.
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