RollingPhaseEstimator Class

public sealed class RollingPhaseEstimator

Public NotInheritable Class RollingPhaseEstimator

public ref class RollingPhaseEstimator sealed

Gemstone.PhasorProtocols.SelCWS.RollingPhaseEstimator = function();

Type.createClass(
	'Gemstone.PhasorProtocols.SelCWS.RollingPhaseEstimator');

Inheritance

Object    RollingPhaseEstimator

This class implements the IEEE C37.118-2018 Annex D standard PMU phasor estimation algorithm. It uses precomputed FIR filter coefficients (P-class triangular window or M-class Hamming-windowed sinc) to estimate fundamental-frequency phasors from streaming samples via causal convolution.

Frequency estimation is performed per IEEE Annex D.4, Equations D.3 and D.4, using phase-differencing on the voltage positive-sequence phasor. ROCOF is computed as the second difference of the unwrapped positive-sequence phase angle.

The estimator operates at the full input sample rate and decimates to the configured report rate by selecting every fs/RR-th sample (dyadic decimation), matching the standard's approach.

For P-class filters, an additional magnitude correction per Annex D.6, Equation D.6 is applied to compensate for spectral leakage when the signal frequency deviates from nominal.

Outputs: 6 phasors (IA, IB, IC, VA, VB, VC) plus frequency and ROCOF estimates. Internally computes voltage positive-sequence for IEEE Annex D.4 frequency/ROCOF estimation.

Reference