SYSTEM IDENTIFICATION MODELLING AND IMC BASED PID CONTROL OF IMPRESSED CURRENT CATHODIC PROTECTION SYSTEMS

摘要

Impressed Current Cathodic Protection (ICCP) system is the most practical method ofcathodic protection systems. This system is widely used to prevent the external corrosion of carbon steelstructures; especially those are used in underground oil and gas pipelines. In this paper, the theoreticalbackground, principles and concepts of ICCP systems have been discussed. An effective laboratoryscale for ICCP systems was built according to specific concepts has been clarified. Consequently,theparametric model of this system was obtained using System Identification (SI)approach.Furthermore,an Internal Model Control based Proportional Integral Derivative (IMC-PID)controller has been designed for enhancingthe performance of ICCP systems.Additionally, simulationand onlineimplementation works have been carried out to control ICCP systems at different operatingconditions. Nevertheless, the IMC-PID controller leads todecrease both the Integral of the AbsoluteError (IAE) and the Steady State Error (SSE) which are lower values compared to the open loopsystem.