Abstract
• DC voltage has been studied for the pipeline using different types of DC compensation. • An integrated system has been investigated to exploit the harmful induced voltage or external PV system for compensating the cathodic protection disturbances. • Influence of different DC compensation methods using KOH-PCs without and with the FLC on the DC voltage is studied. • A comparative analysis of the UMIV results with PVSP results in terms of saving and discharging energy per year is introduced. Nowadays, natural gas in the Middle East has been discovered in extremely many quantities, and it is considered the most vital natural resource. Sometimes, the natural gas pipeline is constructed in the desert and paralleled with the high voltage overhead transmission lines (HVOHTLs). An induced AC voltage has appeared on the pipeline due to interfering with the HVOHTLs. Mainly, hydroxide potassium polarization cell (KOH-PC) has been applied to discharge this voltage to the soil within a safety limit. But, the mitigation units have negatively impacted cathodic protection (CP). The DC voltage of the pipeline is initially compensated using externally supplied impressed current cathodic protection (IMCP) units. In many cases, the external power sources have continuity and stability issues. Therefore, this paper presents different strategies as a promising solution to be utilized in reducing the disturbance of the external power sources. The first strategy is exploiting the induced voltage via converting it as DC form by using the controlled rectifier circuit and reapplying on the pipeline as a cathodic protection voltage. The second strategy involves a photovoltaic (PV) system, which integrates into the pipeline. This paper also explores the superiorly of the fuzzy system with different compensation strategies in managing the DC voltage along the pipeline to guarantee better CP performance under any disturbance in the impressed current stations. From the comparative analysis, it is observed that the behavior of the various strategies in compensating the DC voltage deterioration is reasonable. The obtained results reveal that the robustness of the fuzzy logic controller in mitigating the induced voltage and has capable of compensating the cathodic protection disturbance.
Published Version
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