The main objective of DC-Link capacitors is to store energy that is supplied to the IGBT output stage for proper output modulation. Therefore, a high energy and high capacitance product is required to be compact and be capable to withstand over-voltages coming from switching transients, as well as low power losses (ESR) to provide high efficiency. The high frequency switching of the IGBT will invoke high frequency harmonics so they will have high frequency ripple current.