SlidingDftPhaseEstimator Class

Represents a rolling six-phase estimator using a sliding DFT algorithm with optional smoothing.

Definition

Namespace: Gemstone.PhasorProtocols.SelCWS
Assembly: Gemstone.PhasorProtocols (in Gemstone.PhasorProtocols.dll) Version: 1.0.177 -- Release Build+c429d1804aca100dff8e0245d2fd366feebed6ae

C#View Source Request Example

public sealed class SlidingDftPhaseEstimator : IPhaseEstimator

VBView Source Request Example

Public NotInheritable Class SlidingDftPhaseEstimator
	Implements IPhaseEstimator

C++View Source Request Example

public ref class SlidingDftPhaseEstimator sealed : IPhaseEstimator

JavaScriptView Source Request Example

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

Type.createClass(
	'Gemstone.PhasorProtocols.SelCWS.SlidingDftPhaseEstimator',
	null,
	Gemstone.PhasorProtocols.SelCWS.IPhaseEstimator);

Inheritance: Object SlidingDftPhaseEstimator

Implements: IPhaseEstimator

Remarks

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 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.

Constructors

SlidingDftPhaseEstimator

Initializes a new instance of the SlidingDftPhaseEstimator class with independent input sample rate and output publish rate, plus smoothing expressed as time constants (τ).

Properties

IsReady	Gets whether the estimator has filled its window and is producing valid estimates.
NominalFrequencyHz	Gets the nominal frequency in Hz.
OutputRateHz	Gets the configured output publish rate in Hz.
ReferenceChannel	Gets the reference channel index used for frequency tracking (typically VA).
SampleRateHz	Gets the configured sample rate in Hz.
TotalSamplesProcessed	Gets the total number of samples processed.
WindowSamples	Gets the number of samples in the analysis window.

Methods

Equals	Determines whether the specified object is equal to the current object. (Inherited from Object)
GetHashCode	Serves as the default hash function. (Inherited from Object)
GetType	Gets the Type of the current instance. (Inherited from Object)
Reset	Resets the estimator to its initial state.
Step	Push one interleaved sample-group (VA, VB, VC, IA, IB, IC) with its epoch nanoseconds.
ToString	Returns a string that represents the current object. (Inherited from Object)

Fields

DefaultEnableIntervalAveraging	Default value for determining if interval averaging is enabled.
DefaultEnablePublishEMA	Default value for determining if EMA publishing is enabled.
DefaultMaxGapFillSamples	Default maximum gap (in samples) filled by phase-continued synthesis before resynchronizing. A negative value means "auto" (one full analysis window).
DefaultPublishAnglesTauSeconds	Default value for EMA time constant τ (seconds) published angles.
DefaultPublishFrequencyTauSeconds	Default value for EMA time constant τ (seconds) published frequency.
DefaultPublishMagnitudesTauSeconds	Default value for EMA time constant τ (seconds) published RMS magnitudes.
DefaultPublishRocofTauSeconds	Default value for EMA time constant τ (seconds) published ROCOF.
DefaultRecalculationCycles	Default value for number of recalculation cycles.
DefaultReferenceChannel	Default value for reference channel.
DefaultSampleFrequencyTauSeconds	Default value for EMA time constant τ (seconds) published for the internal per-sample frequency smoothing.
DefaultSampleRocofTauSeconds	Default value for EMA time constant τ (seconds) published for the internal per-sample ROCOF smoothing.
DefaultTargetCycles	Default value for number of target cycles.