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Simulating The Transient Response Of ICCPControl Systems

The simulation of passive and active CP systems has over the years become a straightforward matter so that it is regularly performed to aid design and to assist understanding of system behaviour. Such numerical simulation takes into account the highly non-linear effects which take place during corrosion. This paper describes the application of CP simulation to modelling the dynamics of the complete ICCP system, including controllers, generators, anodes and reference cells. This ICCP controller simulation allows representation of various real effects (for example time delay in response), and allows prediction of the transient behaviour of the complete ICCP system. The ICCP system may include several controllers, and multiple anodes and reference cells. The software, which is based on the Boundary Element Method (BEM), uses “virtual instrument” technology to allow the user to manipulate individual controllers in the system, and to view the “output” of the system. The “output” can be output parameters for one or more controllers, or it can be some overall measure of response of the complete system for example UEP signature. Examples are given of application to multiple – controller systems. The transient simulation runs at speeds many times faster than real-time, and so could in principle be used as part of a practical onboard control system.