Design and Implementation of an Uninterruptible Power Supply for Command and Control Center of the Surveillance, Alert & Warning System

The Surveillance, Alert & Warning System (SAWS) is used for surveillance and warning about the potential causes of public dangers in specific areas. The system acquires all the necessary data which represent the state of objects which might cause the potential emergency and dangers, and in case that an emergency situation arises, the system is used for general, partial or selective warning of the population in the endangered area about the danger's occurrence and its cease. The SAWS which is very important, is managed from the Command and Control Center (CCC). The importance of this system is evidenced by the fact that it has data transmission on two transmission paths (WiFi and UHF). The role of uninterruptible power supply (UPS) is very important, because in case of loss of mains power 230V, 50Hz, it should take over the power. The control system should provide a very fast switch to the backup power supply without interruption and voltage failure of the SAWS. The implemented UPS system consists of the following the most important elements: (1) mains charger with PFC, (2) battery bank, (3) inverter and (4) electronic fast static switch. In case of loss of mains power, the required duration of independent operation, i.e. autonomy of the system is about 24 hours. The paper will present the results of design and implementation, as well as the key experimental results obtained during the testing of the power supply system and it's commissioning in exploitation.