/// <summary>
/// Builds <see cref="WaveformState"/> based on this <see cref="PhasorState"/>. Builds waveforms for each potential and current.
/// </summary>
/// <param name="pointsCount"></param>
/// <param name="timeStep"></param>
/// <returns></returns>
public WaveformState ToWaveform(int pointsCount, double timeStep)
{
// Create state for result
var result = new WaveformState(Potentials.Keys, Currents.Keys, SourceDescription);
// Depending on source type
switch (SourceDescription.SourceType)
{
// For AC sources
case SourceType.ACVoltageSource:
{
// For each potential
foreach (var potential in Potentials)
{
// Create sine waves based on the phasor
result.Potentials[potential.Key] = WaveformBuilder.SineWave(potential.Value.Magnitude, SourceDescription.Frequency,
potential.Value.Phase, pointsCount, timeStep).ToList();
}
// Similarly for currents
foreach (var current in Currents)
{
result.Currents[current.Key] = WaveformBuilder.SineWave(current.Value.Magnitude, SourceDescription.Frequency,
current.Value.Phase, pointsCount, timeStep).ToList();
}
} break;
// For DC sources
case SourceType.DCVoltageSource:
case SourceType.DCCurrentSource:
{
// For each potential
foreach (var potential in Potentials)
{
// Build constant waveforms. For DC sources phasor is a purely real number - just take the real part as value of the
// wave.
result.Potentials[potential.Key] = WaveformBuilder.ConstantWaveform(potential.Value.Real, pointsCount).ToList();
}
// Similarly for currents
foreach (var current in Currents)
{
result.Currents[current.Key] = WaveformBuilder.ConstantWaveform(current.Value.Real, pointsCount).ToList();
}
} break;
}
return(result);
}
/// <summary>
/// Creates an instantenous state for some time moment based on phasors in this instance. The time moment is defined as
/// <paramref name="pointIndex"/> * <paramref name="timeStep"/>.
/// </summary>
/// <returns></returns>
/// <param name="pointIndex">Index of the point for which the instantenous values will be calculated, indexing starts from 0</param>
/// <param name="timeStep">Time step between 2 subsequent points</param>
public InstantenousState ToInstantenousValues(int pointIndex, double timeStep)
{
// Create state for result
var result = new InstantenousState(Potentials.Keys, Currents.Keys, SourceDescription);
// Depending on source type
switch (SourceDescription.SourceType)
{
// For AC sources
case SourceType.ACVoltageSource:
{
// For each potential
foreach (var potential in Potentials)
{
// Assign to result an instantenous value of a sine wave based on the phasor
result.Potentials[potential.Key] = WaveformBuilder.SineWaveInstantenousValue(potential.Value.Magnitude,
SourceDescription.Frequency, potential.Value.Phase, pointIndex, timeStep);
}
// Similarly for each current
foreach (var current in Currents)
{
result.Currents[current.Key] = WaveformBuilder.SineWaveInstantenousValue(current.Value.Magnitude,
SourceDescription.Frequency, current.Value.Phase, pointIndex, timeStep);
}
}
break;
// Phasors for DC sources are purely real - simply assign the real part of the phasor - time moment does not influence the value.
case SourceType.DCVoltageSource:
case SourceType.DCCurrentSource:
{
// For each potential
foreach (var potential in Potentials)
{
result.Potentials[potential.Key] = potential.Value.Real;
}
// For each current
foreach (var current in Currents)
{
result.Currents[current.Key] = current.Value.Real;
}
}
break;
}
return(result);
}
/// <summary>
/// Tries to construct a current for <paramref name="element"/>, returns true on success
/// </summary>
/// <param name="element"></param>
/// <param name="voltageBA">If true, it means that current was calculated for voltage drop from
/// <see cref="ITwoTerminal.TerminalA"/> (reference) to <see cref="ITwoTerminal.TerminalB"/>, if false it means that
/// that direction was reversed</param>
/// <param name="current">Current constructed if successful, null otherwise</param>
/// <returns></returns>
protected override bool TryConstructCurrent(ITwoTerminal element, bool voltageBA, out ITimeDomainSignal current)
{
// Try to get voltage drop across the element
if (_VoltageDrops.TryGet(element, out var voltageDrop, voltageBA))
{
// If successful, create a new current signal based on it, cache it
var result = IoC.Resolve <ITimeDomainSignalMutable>(voltageDrop.Samples, voltageDrop.TimeStep, voltageDrop.StartTime);
// Get the minimum frequency - it is needed for capacitor waveform shifting, check if there are any waveforms, if not
// just assign 0 (technically no waveforms result in a zero wave, which is DC)
var minACFrequency = voltageDrop.Waveforms.Count > 0 ? voltageDrop.Waveforms.Keys.Min((x) => x.Frequency) : 0;
// Current is composed of each voltage waveform times admittance of the element
foreach (var waveform in voltageDrop.Waveforms)
{
// Get magnitude of element's admittance
var admittanceMagnitude = element.GetAdmittance(waveform.Key.Frequency).Magnitude;
// Current waveform is the product of voltage waveforrm and magnitude
var finalWaveform = waveform.Value.Select((x) => x * admittanceMagnitude);
// Introduce phase shift for capacitors - but only if minimum AC frequency is greater than 0, if it's not then there were
// no AC voltage sources and so no current will flow through any capacitor
if (minACFrequency > 0 && element is ICapacitor)
{
// Each wave has to be shifted by pi / 2 but only in its period.
// For example, a wave with frequency 2 times the lowest frequency has to be shifted by total of pi / 4 - because
// there are 2 periods of it in the full waveform. This relation is given by minimum frequency / wave frequency
finalWaveform = WaveformBuilder.ShiftWaveform(finalWaveform, minACFrequency / waveform.Key.Frequency * Math.PI / 2);
}
// Add the waveform to the final waveform
result.AddWaveform(waveform.Key, finalWaveform);
}
current = result;
// And return success
return(true);
}
/// <summary> /// Adds a new waveform to the signal. If one already exists for source described by <paramref name="description"/>, adds them together, /// otherwise makes a new entry in <see cref="ITimeDomainSignal.ACWaveforms"/>. or <see cref="ITimeDomainSignal.DCWaveforms"/>. /// The waveform is given by a constant value - full /// waveform will be constructed from it. /// </summary> /// <param name="description"></param> /// <param name="value"></param> /// <exception cref="ArgumentNullException"></exception> public void AddWaveform(ISourceDescription description, double value) => AddWaveform(description, WaveformBuilder.ConstantWaveform(value, Samples));
