Real Time Implementation of Cascade Process using NI ELVIS in LabVIEW

Abstract

The main objective of this work is to enforce PID controller in a real time process, and to find out the best robust control settings for cascade process. In this work, process variable level is controlled in a cascade mode. Level and flow are considered as primary and secondary variable, respectively. Process models of flow and level are identified as First order plus dead time models. Validated model is used for controller design. Ziegler Nichol’s (ZN), Tyreus-Luyben (TL) and Internal Model Control (IMC) are PID control settings, calculated and implemented in real time process in the LabVIEW environment through NI ELVIS interface. The set point tracking and servo responses are accumulated using NI LabVIEW platform for the comparison of desirable controller. Analysis is performed and best control setting is highlighted through time domain analysis, performance index and robustness test.

Keywords: cascade process, PID controller, LabVIEW, stability analysis, process control

Cite this Article

AravindP, Karpagam G, Nalini M, et al. Real Time Implementation of Cascade Process Using NI ELVIS in Labview. Journal of Control & Instrumentation. 2015; 6(1): 37–43p.