POWER-SYSTEM FREQUENCY ESTIMATION UTILIZING THE NEWTON-RAPHSON METHOD

The paper describes a new algorithm for measuring frequency at a power system bus. The algorithm is based on the Newton-Raphson iterative me thod using the digitized voltage samples at a relay location. The math ematical development of the algorithm is presented and the effects of key parameters that affect the performance of the algorithm are discus sed. The algorithm is encompassing the Newton-Raphson method, which is very common for load flow studies. The algorithm shows a high measure ment accuracy over a wide range of frequency changes. To demonstrate t he efficiency of the proposed algorithm, results of a numerical experi ment are presented.