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南海某气田水下大功率设备长距离回接供电方案设计
Design of long-distance tie-back power supply scheme for underwater high power equipment in a gas field in the South China Sea
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- DOI:
- 10.3969/j.issn.1001-2206.2025.S.028
- 作者:
- 郭江艳, 安维峥, 李达, 刘维滨, 刘聪, 侯广信
GUO Jiangyan, AN Weizheng, LI Da, LIU Weibin, LIU Cong, HOU Guangxin
- 作者单位:
- 中海油研究总院有限责任公司, 北京 100028
CNOOC Research Institute, Beijing 100028, China
- 关键词:
- 水下降压供电系统; 水下变压器; 长距离供电; 南海某气田
subsea step-down power supply system;subsea transformer;long-distance power supply;a gas field in the South China Sea
- 摘要:
- 南海某气田后期湿气压缩项目是我国目前传输距离最远的水下供电项目，其压缩机与变频器之间的距离长达80 km，压缩机负载功率高达8 MW，属于长距离大功率输电的技术难题。通过潮流分析优化供电系统拓扑结构，基于MATLAB仿真检验电机的启动动态特征，并对设备运行过程中的故障保护进行分析，最终提出水上变频驱动器+水下双分裂变压器的方案。该方案成功解决了两台水下大功率压缩机的长距离供电等难题，有效验证了方案的可行性。该项目不仅是我国首个全流程水下降压供电系统，更以其1 300 m水深下80 km回接距离刷新了世界纪录，其技术参数与设计方法可为我国海上油田水下供电及深水能源开发提供借鉴。
The late-stage wet gas compression project in a gas field in the South China Sea is currently the underwater power supply project with the longest transmission distance in China. The distance between the compressor and the frequency converter is up to 80 km, and the load power of the compressor is as high as 8 MW, posing challenges to long-distance, high-power transmission. The paper optimized the topology of the power supply system through flow analysis and verified the dynamic characteristics of startup of the motor through MATLAB simulation. It also analyzed fault protection during equipment operation. The solution of using surface VFD + underwater dual-split transformer ultimately solved the challenges of long-distance power supply for two underwater high-power compressors, which validated the feasibility of the solution. This project serves not only as China’s first subsea step-down power supply system but also as the world's longest-tie-back-distance (80 km) project at a depth of 1 300 m. Its technical parameters and design method can provide reference for underwater power supply in other offshore oilfields and development of deep-water energy in China.