The infrastructure is powered by an Uninterruptible Power Supply (UPS) system.
The UPS has its own enclosure unit in which there are 3 25KVA/KW power units (modules) and 3 battery branches, each of which consists of 40 batteries. The total power is 75KW. The UPS works in a 2+1 architecture, i.e. the two 25KW modules will support the load and its power. Each module has a three-level Pulse Width Modulation (PWM) system capable of converting direct current from the rectifier or batteries into alternating current and will include a vector control system based on a digital signal processor (DSP) for control of its operation and the control of the load balancing between the modules, without the need for an additional control unit. The UPS has a manual maintenance bypass switch inside the cabin with the UPS modules, which transfers the load to the bypass line to allow the UPS to be turned off and isolated for maintenance operations. The UPS is controlled by a microprocessor and displays measurements, alerts and operating modes on an LCD Touch Screen, with a mimic diagram. This screen automatically displays, through graphics, the status of each internal functional block, the power flow and the output power percentage, for each of the power modules and for the whole, all in real time.
Cloud Computing: The technology of inspiration
Department of Materials Science and Engineering, University of Ioannina