Title :
A synchronous digital filter for 50 Hz line frequency signal processing
Author_Institution :
Signal Process. Lab., Tampere Univ. of Technol., Finland
Abstract :
A new multistage digital filter is proposed for 50 Hz line frequency signal processing in zero-crossing detectors and synchronous power systems. The purpose of the filter is to extract the fundamental sinusoidal signal from noise and impulsive disturbances so that the output is accurately in phase with the primary input signal. This is accomplished with a cascade of a median filter, a linear-phase FIR filter and a phase corrector. A 10 kHz output timing resolution is achieved by up-sampling with a customized interpolation filter
Keywords :
FIR filters; digital filters; interpolation; median filters; power filters; power systems; signal processing; 10 kHz; 50 Hz; customized interpolation filter; fundamental sinusoidal signal extraction; impulsive disturbances; line frequency signal processing; linear-phase FIR filter; median filter; noise; output timing resolution; phase corrector; primary input signal; synchronous multistage digital filter; synchronous power systems; up-sampling; zero-crossing detectors; Detectors; Digital filters; Digital signal processing; Finite impulse response filter; Frequency; Interpolation; Phase noise; Power systems; Signal resolution; Timing;
Conference_Titel :
Industrial Electronics, Control and Instrumentation, 1997. IECON 97. 23rd International Conference on
Conference_Location :
New Orleans, LA
Print_ISBN :
0-7803-3932-0
DOI :
10.1109/IECON.1997.671052
