Three-Phase Three-Level Phase-Shifted PWM DC–DC Converter for Electric Ship MVDC Application

A review of power electronics equipment for all-electric ship MVDC power systems

“…All the high power DC/DC converters found in the above mentioned literature are built as reduced-scale laboratory prototypes. On the other hand, two examples of full-scale laboratory prototypes for shipboard applications can be found in [175,176]. In [175] two 1-MW prototypes of resonant dual active bridge bidirectional DC/DC converters are built and experimentally tested.…”

“…The converters are intended to perform the function of HV/LV SSTs in MVDC shipboard power systems. In [176] another MW-level prototype is built in order to test the performance of a proposed DC/DC converter for MVDC shipboard applications. The converter is composed of three paralleled isolated modules, each one having the full-bridge NPC structure of the converter addressed in [153].…”

An Overview of Power Electronics Techniques in Electric Systems for Transport Applications

“…A three-phase three-level (TPTL) phase-shifted PWM (PSPWM) DC-DC converter was proposed in [60] for ES MVDC direct current application. The semiconductor switches and diodes will experience relatively high current stress when single-phase three-level converters are applied for MVDC MW level application.…”

“…With the purpose of decreasing the total harmonic distortion (THD) of transformer primary side voltage, the utilization of PSPWM was applied with the best operating point. The MW level TPTL DC-DC converter proposed in [60] has the merits of efficiency over 95%, output voltage ripple less than 4%, undershoot and overshoot less than 17% and 11% respectively, and the settling time for the dynamic load is shorter than 0.5s. The circuit structure of the proposed TPTL phase-shifted DC-DC converter is displayed in Fig.…”

“…Fig7. Proposed TPTL phase-shifted DC-DC converter [60] The proposed PSPWM DC-DC converter was proven to be suitable for ES MVDC application, and its performance features can be summarized as [60]: 1) good dynamic performance under low switching frequency; 2) small ripples in the output voltage; 3) good total current sharing; 4) high reliability; 5) plug and play capability; and 6) high efficiency. Therefore, by negotiating the loads which require low output voltage and high currents, a high input voltage can be accepted for the proposed converter.…”