Topology, cost and efficiency comparisons of a 2 MW DC supply using interleaved DC-DC converter

An optimal design of a 2-MW dc supply which has a variable output dc voltage range between 400 V and 1500 V and is intended for testing equipment under IEEE 1547 is presented in this paper. Trade-offs between size and system complexity must be taken into account because the main components (dc inductor, semiconductor switches, cooling system, etc.) of such a high power system are expensive and/or bulky. Several dc-dc converter topologies are considered and compared for the application and all the components in this design were selected based on current market availability. The 4-stage interleaved dc-dc converter topology is finally selected since it has a good performance to price ratio. The control algorithm based on the selected topology is illustrated and simulation results are presented and described. These simulations demonstrate that the proposed dc supply design provides an acceptable dc power source for testing distributed generation equipment under IEEE 1547 at relatively high power levels.