Stabilization and PID tuning algorithms for second-order unstable processes with time-delays
MetadataShow full item record
© 2017 Open-loop unstable systems with time-delays are often encountered in process industry, which are often more difficult to control than stable processes. In this paper, the stabilization by PID controller of second-order unstable processes, which can be represented as second-order deadtime with an unstable pole (SODUP) and second-order deadtime with two unstable poles (SODTUP), is performed via the necessary and sufficient criteria of Routh-Hurwitz stability analysis. The stability analysis provides improved understanding on the existence of a stabilizing range of each PID parameter. Three simple PID tuning algorithms are proposed to provide desired closed-loop performance-robustness within the stable regions of controller parameters obtained via the stability analysis. The proposed PID controllers show improved performance over those derived via some existing methods.
Showing items related by title, author, creator and subject.
Stabilization and analytical tuning rule of double-loop control scheme for unstable dead-time processUgon, Bejay; Nandong, Jobrun; Zang, Zhuquan (2017)© Published under licence by IOP Publishing Ltd. The presence of unstable dead-time systems in process plants often leads to a daunting challenge in the design of standard PID controllers, which are not only intended to ...
Oxidative treatment of bromide-containing waters: Formation of bromine and its reactions with inorganic and organic compounds - a critical reviewHeeb, M.; Criquet, Justine; Zimmermman-Steffens, S.; von Gunten, Urs (2014)Bromide (Br-) is present in all water sources at concentrations ranging from ~10 to >1000 µg L-1 in fresh waters and about 67 mg L-1 in seawater. During oxidative water treatment bromide is oxidized to hypobromous ...
Sarmiento, A.; Espath, L.; Vignal, P.; Dalcin, L.; Parsani, M.; Calo, Victor (2017)We propose a second-order accurate energy-stable time-integration method that controls the evolution of numerical instabilities introducing numerical dissipation in the highest-resolved frequencies. Our algorithm further ...