Harmonic Filters Damping Resistors
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Harmonics in Industrial Power Systems The level of Harmonic Voltages and Currents in electrical power systems is increasing. The main reason is the increasing use of devices producing harmonics such as Static Converters.Variable Speed Drives...) The single largest cause of severe harmonic distortion is Resonance. A "normal" harmonic can be amplified 10 to 25 times if resonance occurs at or close to critical frequencies. In most cases, this results from indiscriminate application of Power Factor Correction Capacitors or from incorrect tuning or control of harmonic filter circuits. The effect...

Damping Resistors in Harmonic Filters In order to build Harmonic Filters, the traditional way is to use Capacitors and Inductors. By connecting these two elements in various configurations, a well defined frequency response can be achieved. However, the available components do have a very high quality factor which means very low losses. This results in a system which is also very susceptible for undesired resonances, or poor performance with variable frequencies. Resistors can help to improve this behavior. They act as damping elements in an oscillating system, similar to tlie shock...

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