高压直流接地极对埋地管道腐蚀的影响和管控思考

高压直流输电、油气长输管道建设促进了全国范围内的能源优化配置,但高压直流接地极放电对埋地管道的强直流干扰问题应该引起足够关注。为进一步加强相关风险管控,回顾中国高压直流输电网的发展历程,对高压直流接地极放电影响管道的典型特点进行分析,结合当前实际提出后续风险管控的发展方向。研究结果表明:邻近油气长输管道路由的高压直流输电线路和接地极对管道的影响具有干扰时间不确定、干扰机理复杂、干扰程度大及缓解困难的特点,是管道当前面临的突出安全风险。高压直流输电网调试或故障运行过程中,接地极单极放电会加速管道腐蚀。后续应从加强沟通协调和联合测试,深化腐蚀机理和规律研究,采取综合治理措施等方面提升检测、研究及治理水平,全方位保障国家能源通道的安全稳定。

Influence of HVDC grounding electrode on corrosion of buried pipelines and thought on risk management and control

Construction of high voltage direct current(HVDC)transmission system and long-distance oil and gas pipelines has greatly optimized the allocation of energy resources in China.However,attention should be paid to the strong direct current interference caused by the discharging of the HVDC grounding electrode to the buried pipelines.In order to further strengthen the management and control of the relevant risks,the development history of HVDC transmission grid in China was summarized,the typical characteristics of the influence of HVDC grounding electrode by discharging on the buried pipelines were analyzed,and the development direction of risk management and control was identified according to the actual conditions.The results indicate that the influence of HVDC lines and grounding electrodes on the nearby longdistance oil and gas pipelines in the same route has the characteristics of random time,complex interference mechanism,great interference intensity and difficulty in mitigation,and it is one of the prominent safety risks pipelines face to presently.During the commissioning or fault running of the HVDC transmission grid,discharging of single grounding electrode will accelerate the corrosion of buried pipelines.In the future,the level of inspection,research and governance should be enhanced by strengthening the communication,coordination and joint testing,studying the corrosion mechanism and rules in depth and taking the comprehensive governance measures,so as to guarantee the safety and stability of the national energy corridors in all rounds.