Operation of A Platform-less DC Collection System for Offshore Wind Farms with Reduced Curtailment Using Energy Storage

Sakshi Singh, D. Chatterjee, Tanmoy Bhattacharya
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Abstract

In this paper, a series connected DC wind energy collection topology is considered for offshore windfarms (OWF). Dual Active Bridge (DAB) with medium frequency transformer is used to reduce the size of the interface between the permanent magnet synchronous generator (PMSG) and the high voltage DC (HVDC) line. The series connection of the DAB output capacitors helps in achieving the platform-less operation by eliminating the need for a low frequency step-up transformer, but leads to a severe mismatch of the DAB output voltages due to the unequal wind power inputs at the wind turbines (WTs). Overvoltage at DAB output can be avoided by curtailment, i.e. operating the turbine away from the maximum power point tracking (MPPT) using WT inertia, which leads to loss of available energy. The possible use of ultra-capacitors (UC) to reduce the loss in energy is demonstrated in this work.
利用储能减少弃风的海上风电场无平台直流收集系统的运行
本文研究了海上风电场(OWF)串联直流风能收集拓扑结构。采用带中频变压器的双有源电桥(DAB)来减小永磁同步发电机(PMSG)与高压直流(HVDC)线路之间的接口尺寸。通过消除对低频升压变压器的需要,DAB输出电容的串联连接有助于实现无平台运行,但由于风力涡轮机(WTs)的风力输入不相等,导致DAB输出电压严重不匹配。DAB输出的过电压可以通过削减来避免,即使用WT惯性使涡轮机远离最大功率点跟踪(MPPT),从而导致可用能量的损失。在这项工作中,展示了使用超级电容器(UC)来减少能量损失的可能性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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