Power quality harmonic monitoring by the O-splines-based multiresolution signal decomposition

摘要: This investigation demonstrates the effectiveness of finite impulse response (FIR) filters implemented with the O-splines of the discrete-time Taylor–Fourier transform (DTTFT), as a multiresolution signal decomposition, for power quality harmonic monitoring in modern electrical grids. For this purpose, the computational burden of the O-splines is reduced, making them suitable for their implementation in microcontrollers or digital signal processors with a reduced cost. Thus synthetic signals and actual measurements collected by a commercial three-phase power analyzer are in detail evaluated with this proposal. Synthetic signals are demodulated by employing FIR filters, aiming to estimate its THD and its relationship with its odd harmonics. Actual measurements, corresponding to a switching disturbance after introducing a capacitor bank in an isolated lab-scale system composed of a three-phase synchronous …