I am designing a filter for a power supply. because the incoming three phase AC is varing both in amplitude and frequency the filter after the 6 pulse rectifier needs some work. The filter starts with a supercapacitor in parallel then a CLC-filter after the supercapacitor. After the filter a three phase IGBT bridge will be conected and then a transformer and finaly the grid. Need some help with the size on the filter, and how to calculate the values on the passive components in the filter. The incoming AC will have a maximum value of 600V. Tanks (if you need more info about the circuit please tell me) please can someone help me !!!