Real-time determination of power system frequency

The main frequency is an important parameter of an electrical power system. The frequency can change over a small range due to generation-load mismatches. Some power system protection and control applications require accurate and fast estimates of the frequency. Most digital algorithms for measuring frequency have acceptable accuracy if voltage waveforms are not distorted. However, due to non-linear devices the voltage waveforms can include higher harmonics. The paper presents a new method based on digital filtering and Prony´s model. Computers simulation results confirm, that the method is more accurate than others