In process control applications, above 90% of the

\r\ncontrollers are of PID type. This paper proposed a robust PI

\r\ncontroller with fractional-order integrator. The PI parameters were

\r\nobtained using classical Ziegler-Nichols rules but enhanced with the

\r\napplication of error filter cascaded to the fractional-order PI. The

\r\ncontroller was applied on steam temperature process that was

\r\ndescribed by FOPDT transfer function. The process can be classified

\r\nas lag dominating process with very small relative dead-time. The

\r\nproposed control scheme was compared with other PI controller

\r\ntuned using Ziegler-Nichols and AMIGO rules. Other PI controller

\r\nwith fractional-order integrator known as F-MIGO was also

\r\nconsidered. All the controllers were subjected to set point change and

\r\nload disturbance tests. The performance was measured using Integral

\r\nof Squared Error (ISE) and Integral of Control Signal (ICO). The

\r\nproposed controller produced best performance for all the tests with

\r\nthe least ISE index.<\/p>\r\n","references":null,"publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 79, 2013"}