Digital signal processing algorithms for power and line parameter measurements with low sensitivity to frequency change

A novel approach to definition of digital signal processing algorithms using bilinear form representation is introduced. The new algorithms are used to calculate power system power and line parameter values based on the current and voltage samples. The bilinear form approach provides a convenient methodology for optimal design of digital signal processing algorithms. This feature is utilized to design digital algorithms for power and line parameter measurements with low sensitivity to system frequency change. Several different algorithms are defined and their performance is investigated by testing their sensitivity to system frequency change. Various sampling rates and different data windows are utilized to define several test cases