Power system fundamental frequency estimation using variable step size NLMS

Frequency estimation is an essential technique to the power system network especially when many power system applications such as load shedding, security assessment and protection relays rely on it. Therefore, rapid and precise frequency estimator is required. This paper present normalized variable step size least mean square with the complex form to estimate the fundamental power system frequency. The complex form of the voltage signal is obtained from the three phase voltages using transforming method. To evaluate the performance of the presented method several simulation cases that may be found in real system have been conducted and the results compared to the existing variable step size least mean square frequency estimation method. Moreover, the result reveals that the presented method has fast convergence speed as compared to the existing method.