The analysis of wind turbine output power measurements from the offshore wind farm Horns Rev 1 demonstrates a significant likelihood of wind turbine output powers to be very similar at a given time within offshore wind farms. This paper exploits this observation by proposing a new offshore wind farm configuration with DC collection system and series-connected wind turbines based on partial power processing converters (PPPCs) and diode-bridge rectifiers. In the proposed wind farm configuration, PPPCs are only required to process output power differences among wind turbines in a wind farm to achieve maximum power point (MPP) operation, yielding a potential for efficiency and sizing improvements. This paper addresses major design considerations at wind farm, wind turbine, and PPPC levels. System operation of the wind turbine design is derived, alongside with a matching control system and HVDC-link current scheduling algorithm. The proposed wind farm is successfully tested for low voltage ride through, power curtailment, inertia response, and communication system outage scenarios. Time-transient simulations of a 30-turbine series string using measured and artificial wind speed profiles demonstrate that wind turbines can achieve MPP operation while only a fraction of power needs to be processed by the PPPCs.

中文翻译：

---

具有差分功率处理的直流收集系统的海上风电场

对来自海上风电场 Horns Rev 1 的风力涡轮机输出功率测量结果的分析表明，在海上风电场内的给定时间，风力涡轮机输出功率非常相似的可能性很大。本文通过提出具有直流收集系统和基于部分功率处理转换器 (PPPC) 和二极管桥式整流器的串联风力涡轮机的新型海上风电场配置来利用这一观察结果。在提议的风电场配置中，PPPC 只需要处理风电场中风力涡轮机之间的输出功率差异，以实现最大功率点 (MPP) 运行，从而产生效率和尺寸改进的潜力。本文讨论了风电场、风力涡轮机和 PPPC 级别的主要设计考虑因素。风轮机设计的系统运行推导，以及匹配的控制系统和 HVDC 链路电流调度算法。拟议的风电场已成功通过低电压穿越、电力削减、惯性响应和通信系统中断场景的测试。使用测量和人工风速曲线对 30 台涡轮机串联串的瞬态模拟表明，风力涡轮机可以实现 MPP 运行，而 PPPC 只需要处理一小部分功率。