VOLTAGE PHASOR AND LOCAL SYSTEM FREQUENCY ESTIMATION USING NEWTON TYPE ALGORITHM

A new approach to the design of digital algorithm for voltage phasor a nd local system frequency estimation is presented. The estimation prob lem is considered as an unconstrained optimization problem. The algori thm is derived using Newton's iterative method, very commonly used in Load-Flow studies. The algorithm showed a very high level of robustnes s as well as high measurement accuracy over a wide range of frequency changes. The algorithm convergence of order two provided fast response and adaptability. To demonstrate the performance of the algorithm dev eloped, computer simulated, experimentally obtained and real-life data records are processed. The presented work is a part of a project conc erning the application of microprocessors in frequency relaying.