Impact of wide-spread use of uninterruptible power supplies on Pakistan's power system

Different types of UPS have been studied in our laboratory. Their charging and discharging processes have been investigated with respect to the harmonics in current and their efficiencies. The UPSs have been estimated to contribute a loss of 410 MW in Pakistan's power system. The cost of the energy lost in these UPSs, from year 2007 to 2013, has been estimated around 1934 million US dollars. The paper finally concludes that there is a need of energy policy in Pakistan to regulate the use of UPSs and related power quality issues.