邹绍维 燕朝果 梁东江 黎才文 黄崇林 苏乃权

摘要：由于恒电位仪防腐涂层存在着老化、磨损等问题，常加入阴极保护措施。阴极保护恒电位仪常运用于山地的长距离埋地输油管道的检测，其所处的环境比较复杂，检测效果常受复杂环境因素影响，为克服阴极保护极化的高阶延迟性和不精确性。采用控制精度更高、抗干扰能力更强的模糊 PID 算法对恒电位仪系统进行设计。主要是通过预存知识库对输入量进行模糊推理，再结合模糊决策生成 PID 控制参数的调节量，以此实现 PID控制器控制参数的自动整定及控制量调节，从而达到控制的目的，有效提升系统的控制精度和可靠性。通过模拟测试验证，模糊 PID 控制相对于传统 PID 控制对系统的输出量调控更加稳定。

关键词：恒电位仪;模糊 PID 控制; PID 控制;阴极保护

中圖分类号：TG174.4文献标志码：A文章编号：1009-9492（2021）11-0243-04

Design of Cathodic Protection Potentiostat Based on Fuzzy PID Control

Zou Shaowei1，Yan Chaoguo1，Liang Dongjiang1，Li Caiwen1，Huang Chonglin2，Su Naiquan2※

（1. South China Branch， National Petroleum and Natural Gas Pipeline Network Group Co.， Ltd.， Maoming， Guangdong 525000， China;2. School of Electromechanical Engineering， Guangdong University of Petrochemical Technology， Maoming， Guangdong 525000， China）

Abstract： Due to the aging and wear of potentiostat anticorrosive coating， cathodic protection measures are often added. Cathodic protection potentiostat is often used to detect long-distance buried oil pipelines in mountainous areas， the environment of its location is complex， and the detection effect is often affected by complex environmental factors. In order to overcome the high-order delay and inaccuracy of cathodic protection polarization， the fuzzy PID algorithm with higher control accuracy and stronger anti-interference ability was used to design the potentiostat system. It mainly carried out fuzzy reasoning on the input quantity through the pre-stored knowledge， and then generated the adjustment quantity of PID control parameters in combination with fuzzy decision-making， so as to realize the automatic setting of PID controller control parameters and the adjustment of control quantity. So as to achieve the purpose of control， and effectively improve the control accuracy and reliability of the system. The simulation test shows that the fuzzy PID control is more stable than the traditional PID control.

Key words： potentiostat; fuzzy PID control; PID control; cathodic protection

0 引言

防腐涂层技术和阴极保护技术是保护埋地金属管道免受电化学腐蚀的两种重要手段。但由于防腐涂层存在着老化、磨损等问题，单独采用防腐涂层技术的管道仍然具有极大的风险被腐蚀。因此对重要的管道往往需要采取防腐涂层和阴极保护联合的保护措施。其中阴极保护就是利用外部直流电源对金属材料的被保护的对象接通阴极电流，使其阴极极化的过程。工程中一般采用恒电位仪来进行阴极保护，而恒电位仪是一种能够通过比较给定信号和反馈信号从而自动调节输出功率的工业直流电源，可对地下或水下的金属构件提供电流阴极保护，从而达到减缓电化学腐蚀、增加埋地金属件使用寿命的目的[1-3]。……