A new UPS topology for multi-megawatt medium voltage power protection

The footprint and electrical power needed to protect and run a large critical power facility has increased over the past decade. The established technologies are expensive and inefficient and facility owners are looking for a new approach. One solution is to push the power protection up the network to medium voltage (MV). Today this can be done with Diesel rotary Uninterruptible Power Supply (DRUPS), but a new unique approach is to apply a static UPS at MV in a highly efficient new UPS topology. This paper presents ABB's new “ZISC” architecture and the PCS120 MV UPS product.