Power system frequency measuring based on virtual instrument technology

Frequency is the important indicator of power system quality, and the major operating parameter of electrical equipment. Frequency changes are harmful to the normal operation of power system, the measurement of frequency and keep the frequency deviation in the extent provided is necessary. The virtual instrument for frequency measurement of power. system is designed and implemented based on software LABVIEW by using spectrum correction algorithm, and the principle and the key technique of which are discussed in the detail. Simulation and application show that, the approach is suitable for real time, implementation and gives good accuracy (frequency measuring error is far less 0.01 Hz when frequency vary between 48 similar to 52 Hz), the effect of harmonics and noise can be rejected efficiently, besides, the cost and developing period of the equipment also can be reduced.