Solution to the ferroresonant jump problem in three-phase power conditioning systems

The solution to the ferroresonant jump problem was found through the analysis of the power conditioning system´s steady-state behavior. This analysis showed that proper control of the harmonics present in an oscillatory mode can lead to the suppression of the oscillation, and hence, force the system into the desired mode of operation. The theoretical solution was successfully tested on a power conditioning system installed in a laboratory. An oscillation-causing transient was created through a test. With the system in oscillatory mode, the time-domain samples of one of the input currents were collected and its spectral density was calculated. It was found that the dominating component had a frequency of 100 Hz. A 100 Hz trap was then designed and incorporated in the system. Under the same test conditions, no oscillation occurred with the trap in place, and the system was forced into the normal mode of operation