Design Of Intelligent Potentiostat For Buried Pipiline

In China,Fossil energy sources such as oil and natural gas are mostly transported using long-distance transportation pipelines.It is particularly important to effectively protect and monitor the safety of pipeline operation.At this stage,cathodic protection technology is commonly used in China to achieve anti-corrosion protection of pipelines.The potentiostat is the core equipment of the forced current cathodic protection technology for pipelines.Now in the market,the potentiostat have the problems of complex control,low efficiency,and inability to achieve remote data communication.This paper applies modern power electronics technology,modern communication technology,and embedded technology to design and implement a new type of intelligent potentiostat.Based on the completion of the potentiostat's basic functions,in order to solve the problem that the potentiostat and the buried pipeline potential collector are unable to achieve synchronous work and affect pipeline cathodic protection monitoring,a potentiostat control that supports the full-line synchronous potential on-off of the pipeline is proposed.The method realizes the full-line synchronous on-off monitoring function and remote automatic adjustment of the potentiostat output.The main tasks completed in this article are as follows:First,according to the functional requirements of the potentiostat in cathodic protection technology,according to the modular design idea,the hardware circuit and software process of the potentiostat were designed.The processor selects MSP430F5438 A,and uses its rich IO interface and serial port interrupt resources to complete specific functions.According to the requirements of functional modules,peripheral circuits such as switching power supply module,data storage module,communication module,Beidou /GPS module are designed.The software program of the potentiostat is mainly designed to complete the functions of potential data acquisition,data communication,human-computer interaction,and remote synchronous on-off.Secondly,in order to solve the problem of collecting the power-off potential of the pipeline at the current stage by installing a power-off test piece to collect the power-off potential,it is difficult to realize the output control of the potentiostat and the simultaneous acquisition of multi-point data of the long-distance pipeline.The design of a potentiostat clock synchronization system based on Beidou timing provides a strict synchronization between the output of the potentiostat and the multi-point potential acquisition of the entire pipeline.This improves the method of collecting power-off potentials and improves the authenticity of pipeline protection data and provides data support for assessing pipeline status.Finally,a remote monitoring platform for pipeline cathodic protection is designed and implemented.The platform can monitor the operating status and system information of the potentiostat.At the same time,on the basis of realizing the simultaneous on-off potential collection of the entire pipeline,by adding an expert diagnostic system,the protection status is scientifically evaluated,and the output of the potentiostat can be automatically adjusted according to the pipeline protection status to realize the automatic management of pipeline protection.The experimental test proves that the developed intelligent potentiostat has high potential accuracy,the output error is controlled within 1%,and the synchronous on-off function and communication function meet the design requirements.When the pipeline is under-protected or over-protected,it can realize remote automatic adjustment of the potentiostat.At present,this product has been use in Shenzhen Sinopec Pipeline with good results.