Source X/R Ratio on Harmonic Analysis

[jasl]

Can someone brief me about the effect of source (Grid) X/R ratio in power system harmonic analysis?
Also the effect of voltage regulation in the main grid on the harmonic voltage distortion?

 

[busbar]

 
In ANSI regions, one reference may be IEEE Std 519-1992 ...Practices and Requirements for Harmonic Control in Electrical Power Systems §5. System Response Characteristics.

Description of standard:

http://standards.ieee.org/reading/ieee/std_public/description/staticp/519-1992_desc.html

 

[jghrist]

Source inductance (the X in the X/R ratio) will interact with capacitance and result in resonance at different frequencies. At points of resonance, the impedance is at a very high (series resonance) or very low value (parallel resonance), which affects the flow of harmonic current. The resistance R will provide damping and reduce the severity of harmonic resonance points. Voltage regulators also have an inductance that affects resonance points. There is no simple relationship of X/R ratio or voltage regulation to harmonics.