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 a real-time phasor measurement algorithm suitable for power system applications. It uses a Sliding Discrete Fourier Transform (SDFT) approach to efficiently compute phasors at each sample with O(1) complexity.

Frequency estimation is performed by tracking the rate of change of phase angle from the reference channel (VA by default). The SDFT twiddle factor rotation removes the nominal bin frequency component, so residual phase changes between samples directly represent frequency deviation from nominal. The frequency and ROCOF outputs are smoothed using exponential moving average filters.

The algorithm is designed for nominal 50Hz or 60Hz systems sampled at 3000Hz, but can be configured for other sample rates.

Magnitude Output:
The magnitude output represents the RMS value of the fundamental frequency component. If input data is already normalized (per-unit values with peak ≈ 1.0), the output RMS magnitudes will be approximately 1/√2 ≈ 0.707 per unit. To obtain actual engineering units, multiply output magnitudes by the appropriate scaling factor (e.g., VT/CT ratios or nominal voltage/current values).

Reference