POWER SYSTEM FREQUENCY MEASUREMENT METHOD, BUS VOLTAGE CORRECTION METHOD AND DEVICES

The present invention relates to a power system frequency measurement method, a bus voltage correction method, and devices, belonging to the technical field of power system frequency measurement. In the present invention, a positive sequence phase voltage is used to calculate the frequency of a power system; for an angle error of a voltage analog quantity caused due to either magnitude flop or neutral point shift, all positive sequence components calculated by means of composition of three-phase voltage phasors can effectively counteract the error and shift therein. Therefore, the frequency measurement method of the present invention is not affected by a voltage zero-crossing point or a harmonic wave, not only being able to accurately measure the frequency of a power system in a steady state, but also effectively solving the problem of large frequency measurement errors caused by voltage jump. La présente invention concerne un procédé de mesure de fréquence de système d'alimentation, un procédé de correction