Success story ABB Harmony upgrade provides secure, reliable and powerful control for Duvha coal-fired power plant Duvha power station is a six unit, coalfired power plant operated by the South African electrical utility, Eskom, with a total installed capacity of 3,600 megawatts (MW). The plant is located in approximately 15 km east of Witbank in Mpumalanga province. The Duvha plant’s control system consists of the ABB Harmony INFI 90 process control system, with 17 power conditioning units (PCUs), multi-function processors (MFP), bridge controllers (BRC100) and block I/Os. The original human machine interface (HMI) solution from the late 1990s is based on Process Portal B/Windows 2000. After more than 15 years of good operation the system faced normal component aging, in additi

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