Low phase-to-phase-impedance busbar for modular power converter system

A small modular unit for a power converter system with long lifetime DC-link capacitors is proposed. To reduce the ripple current stress of DC-link capacitors and to improve their lifetime by limiting temperature rises, low phase-to-phase-impedance busbars are selected. Consequently, in a power converter system whose size is 101 L, operating at a rated power of 100 kVA, DC-link capacitors achieve a lower temperature rise of 22 K, which means that the capacitor lifetime can be estimated to be over 15 years.