High bandwidth energy storage devices for HEV/EV energy storage system

In a HEV or EV, analysis of the energy storage system (ESS) is often based on standard drive cycles sampled at a 1 Hz rate. The switching harmonics caused by the motor drive are well-known source of high-frequency harmonics on the ESS since perfect de-coupling using the capacitors native to the motor drive is not possible, but additional current harmonics flow between the 0.5 Hz (Nyquist frequency of sampling frequency) and the switching frequency because of the transient nature of load in automotive applications. This digest quantifies these harmonic currents, sizes high-bandwidth energy storage devices (ESDs) for ESS, and compares power loss reduction using measured RMS currents.