海上风电柔性直流系统设计及工程应用

Design and Engineering Application of Offshore Wind Power VSC-HVDC System

针对中国第一个海上风电柔性直流送出工程—江苏如东工程,从系统拓扑方案构建、过电压与绝缘配合、系统功率盈余问题与交流故障穿越技术以及控制保护技术等方面开展了深入研究,构建了轻型紧凑化的海上风电柔性直流系统拓扑方案,取消了海上换流站的启动回路与接地回路等;提出了海陆换流站的避雷器配置方案与参考电压的选取原则,形成了海陆换流站的绝缘配合方案的典型范式;提出了集中式、分布式、混合式直流侧有功功率动态平衡装置的典型拓扑方式,解决了陆上换流站交流侧故障穿越难题;提出了工程的整体控制保护方案,并研究了一种基于电压前馈环节比例谐振控制的有源谐振抑制方法,显著降低了工程的振荡风险。通过工程实际运行,全面验证了所提技术的有效性。

In this paper,for China’s first offshore wind power VSC-HVDC transmission project-Jiangsu Rudong project,indepth research has been carried out in terms of system topology construction,overvoltage and insulation coordination,system power surplus problem and AC fault ride-through technology,and control and protection technology.A lightweight and compact offshore wind power VSC-HVDC system topology scheme is constructed,and the start-up loop and grounding loop of the offshore converter station are canceled.The typical paradigm of the insulation coordination scheme of the station is proposed.The typical topology of the centralized,distributed,and hybrid DC side active power dynamic balance device are proposed,and the AC side fault ride-through problem of the onshore converter station is solved.The overall control scheme of the project is proposed.A protection scheme is developed,and an active resonance suppression method based on the proportional resonance control of the voltage feedforward link is studied,which significantly reduces the oscillation risk of the project.Through the engineering operation,the effectiveness of the technology proposed in this paper has been fully verified.