The use of small-scale wind turbines (SSWTs) in private households not only allows for increased renewable energy generation, but also improved grid stability and resilience of individual regions. However, there are strict requirements regarding the efficiency, reliability and electrical safety of SSWTs because of their low power levels, long payback period and the fact that they are installed nearby residential areas. This paper proposes a novel yaw inductive power transfer system, based on multilevel inverter, which mitigates the main disadvantages of SSWTs - slip rings, low voltage energy generation etc. The system utilizes low voltage MOSFETs in multilevel boost-series resonant topology combined with ZVS techniques to maximize efficiency. The operating principle, switching waveforms and behavior of the inverter are described and analyzed. Cell voltage balancing algorithms are presented as well. Two different control techniques for power flow regulation have been introduced and compared. The effectiveness of the proposed solution has been verified by building a 3.3 kW prototype system and comprehensive measuring of its performance. The experimental results show that peak power transfer efficiency reaches 92.5% while converting generator voltage from 60 V DC to grid compatible 400 V DC.

中文翻译：

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用于小型风力涡轮机的机舱到塔架多级 IPT 系统

在私人家庭中使用小型风力涡轮机 (SSWT) 不仅可以增加可再生能源的发电量，还可以提高个别地区的电网稳定性和弹性。然而，由于SSWT功率水平低、投资回收期长以及安装在居民区附近的事实，对SSWT的效率、可靠性和电气安全有严格的要求。本文提出了一种基于多电平逆变器的新型偏航感应电力传输系统，它减轻了 SSWT 的主要缺点——滑环、低压发电等。该系统利用低压 MOSFET 与 ZVS 技术相结合的多电平升压串联谐振拓扑以最大限度地提高效率。描述和分析了逆变器的工作原理、开关波形和行为。还介绍了电池电压平衡算法。介绍并比较了两种不同的潮流调节控制技术。通过构建 3.3 kW 原型系统并对其性能进行综合测量，验证了所提出解决方案的有效性。实验结果表明，在将发电机电压从 60 V DC 转换为与电网兼容的 400 V DC 时，峰值功率传输效率达到 92.5%。