Zonal ICCP System Control Interactions
Author(s)
V. G. DeGiorgi, M. Pocock, S. A. Wimmer & E. A. Hogan
Abstract
To date much work has been done on modeling shipboard impressed current
cathodic protection (ICCP) systems. The emphasis has been on system
performance: the systems’ ability to maintain the hull at a constant potential
value. Reported system design work has dealt mainly with anode number, anode
placement, subdividing the overall system into power supply zones (anodes
connected to a single power supply with a controlling reference cell) and
reference cell placement. As electronic and hardware advances are incorporated
into new ship designs the system control algorithms are evolving. In general,
system control algorithms can range from simple one point feedback to complex
multiple input-multiple-output that subdivide the structure into small regions.
Multiple input-multiple-output systems provide the ability to fine tune in order to
maintain uniform values throughout the structure. It has long been observed,
both experimentally and on shipboard, that even simple ICCP systems with two
or three power supply zones show zonal interactions. This work uses a model
ship geometry, computational methods and experimental physical scale model
results to further the understanding of the interaction between individual power
zones on a typical shipboard ICCP system.
Keywords: cathodic protection, ICCP system, zone interaction, control,
polarization response.
1 Introduction
Modern ICCP systems are subdivided into zones; each zone contains multiple
anodes which are driven by a single power supply. Each zone has its own
controller and reference cells that feedback information on surface potential at
defined points to the controller. Despite the fact that designers may speak in
terms of zones with the implication that there are zonal boundaries the hull is a
Keywords
cathodic protection, ICCP system, zone interaction, control,
polarization response.
Related Book
Other papers in this volume
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