View source for Power Quality Solutions: Harmonic Filter Design, SVC, Active Filtering

== Statistical Modeling of Renewable Generation ==
* Power electronic based WTs have probabilistic harmonic characteristics which mean the harmonics are continuously varying.
* Conventional average-value based harmonic magnitude and fixed phase angle cannot fully reflect the probabilistic characteristics.
* Conventional harmonic analysis may overestimate the harmonic impact in the planning studies that may result in the additional cost.
* To reflect the realistic harmonic characteristics, probabilistic characteristics are fully considered.
* Time and frequency domain analysis make it possible to model the probabilistic-based harmonic component.
* This modeling methodology is used to analyze the more realistic harmonic impact on the grid in the planning studies.

[[File:PQ_wind.png|600px]]

 - Frequency domain: Individual harmonic magnitudes are randomly generated based on their own probability density function.
 - Time domain: A randomly generated virtual FFT page turns into a waveform that has probabilistic characteristics by using inverse FFT.

== Power Quality Solutions: Harmonic Filter Design, SVC, Active Filtering ==

* Power Quaity Issues : Flicker, Harmonics, Resonance, Sag, Swell, Voltage Stability and etc.
* Static Var Compensator (SVC) : 
 - Compensate the Reactive Power.
 - Mixed thyristors and passive filter.
* Passive Harmonic Filter :
 - Tuned filter(single, double, triple..), High Pass Filter
 - Compensate the Reactive power
 - Eliminate the specific or high order harmonics
* Active Harmonic Filter :
 - Use the Voltage Source Converter
 - Compensate the Reactive power or not.
 - Eliminate many harmonics.

* Design Power Quality Solution : Filter and other FACTS Design and Experiments.
[[File:PQ_harmonic.png|600px]]

[[File:PQ_Experiments.png|600px]]