On-line parametric estimation of damped multiple frequency oscillations

- A parametric estimation technique for multi-frequency oscillations is proposed.
- Parameters of damped oscillation modes are estimated algebraically and online.
- Amplitude, damping, frequency and phase parameters and dc component are estimated.
- Analytical and experimental results confirm the estimation effectiveness.

Undesirable harmonic pollution is currently a reality in many electric power systems. Damped transients generated by the growing use of electronically controlled devices are an important source of harmonic distortion of voltage and current waveforms. Accurate real-time estimation of harmonics parameters during the on-line operation of some electric power system is thus an active and pertinent challenging research issue. In this paper a novel on-line algebraic parametric estimation method in time domain, for damped harmonic components on electric power system signals is introduced. Algebraic formulas to directly compute amplitude, damping, frequency and phase parameters and dc offset component into a small time window for variable multi-frequency oscillations are proposed. Parameter estimators enable the on-line and direct reconstruction in finite time of harmonic components and deviations of some measurable signal. Experimental results confirm the effectiveness of the algebraic parametric estimation on uncertain multi-frequency oscillating transient signals.