Power Quality and Harmonic Analysis

With the Harmonic Load Flow Calculation and the Frequency Sweep Calculation, the user is able to analyse a network in the frequency domain. Contingencies (unplanned outages) can also be taken into account. The module also includes Flicker Analysis and Filter Analysis functions.

What is a Harmonic Load Flow?

PowerFactory’s Harmonic Load Flow carries out a steady-state network analysis at each frequency at which harmonic sources are defined, thus calculating harmonic indices related to voltage or current distortion and harmonic losses.

What is a Frequency Sweep Calculation?

PowerFactory’s Frequency Sweep is a continuous frequency-domain analysis. Typically used for the calculation of network impedances, the analysis reports resonances identified within the specified frequency range.

Harmonic Load Flow

  • Harmonic voltage and current indices (IEC 61000-3-6, BDEW 2008)
  • Balanced (positive sequence) and unbalanced (multiphase) model
  • Option to consider n-1 / n-k contingencies1
  • Unbalanced harmonic sources
  • Non-characteristic and inter-harmonics
  • Multiple harmonic injections: current and voltage sources, thyristor rectifiers, PWM-converters, SVS, non-linear loads, Norton-equivalents
  • Background distortion frequency-dependent R and L values
  • Various harmonic distortion indices such as THD, HD, HF, THF, TAD, TIFmx, total RMS currents and voltages, loadings and losses (defined according to IEEE and DIN/IEC standards)
  • Harmonic distortion plot with pre-defined distortion limits according to international standards
  • Impedance Loci tool for analysing harmonic distortion at connection point
  • Waveform plots
  • Calculation of K-Factors and Loss Factors for 2-winding transformers (UL1562, EN 50464-3 (replaces BS7821), EN 50541-2, IEEE C.57.110-1998)

Flicker Analysis

  • Flicker Assessment (IEC 61400-21):
    • Short- and long-term flicker disturbance factor for continuous and switching operations
    • Relative voltage changes
  • Flickermeter (IEC 61000-4-15):
    • EMT or RMS signals
    • Support of multiple file formats as COMTRADE, CSV, user-defined, etc.

Frequency Sweep

  • Automatic step size adaption or constant step size
  • Balanced (positive sequence) and unbalanced network model
  • Option to consider n-1 / n-k contingencies1
  • Self and mutual impedances/admittances (phase and sequence components)
  • Automatic identification of resonances
  • Frequency-dependent R and L values and line/cable models
  • Spectral density of voltage amplitude/angle
  • Risk assessment of sub-synchronous oscillations using radiality factors

Filter Analysis

  • Various filter models
  • Design and layout parameters
  • Filter sizing and verification reports
  • Ripple control analysis

 

1 Requires Contingency Analysis licence

Videos on YouTube

Harmonics - Industrial Network
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