考虑MMC环流控制的海上风电经柔直送出系统阻抗塑造方法  

Impedance Modeling Method of Offshore Wind Farm Integration Through MMC-HVDC With MMC Circulation Control

作　　者：杨舒婷 陈新[1] 黄通[1] 魏麒璇 YANG Shuting;CHEN Xin;HUANG Tong;WEI Qixuan(Jiangsu Key Laboratory of New Energy Generation and Power Conversion(Nanjing University of Aeronautics&Astronautic),Nanjing 211106,China)

机构地区：[1]江苏省新能源发电与电能变换重点实验室(南京航空航天大学),江苏南京211106

出　　处：《中国电力》2023年第4期38-45,共8页Electric Power

基　　金：国家自然科学基金资助项目(分布式光伏发电系统的振荡风险综合研判及其阻抗协同自治关键技术,52277186)。

摘　　要：基于阻抗分析方法,以模块化多电平换流器(modularmultilevelconverter,MMC)环流控制为研究重点,对海上风电经柔直送出系统的稳定性影响展开深入研究。首先,采用谐波线性化的方法建立了柔直换流站与海上风电场的阻抗模型,进而推导了计及频率耦合效应的海上风电经柔直送出系统的阻抗模型。其次,基于阻抗稳定判据,揭示了环流控制对MMC阻抗及柔直送出系统稳定性的影响,进而提出了一种基于环流环节的MMC阻抗重塑控制方案。最后,通过RT-LAB硬件在环实时仿真系统,验证了稳定性分析结果的正确性和阻抗塑造方案的可行性。Based on impedance analysis,this paper focuses on the circulation control of a modular multilevel converter(MMC)and conducts in-depth research on the stability impact of offshore wind farm integration based on a permanent magnetic synchronous generator(PMSG)through the MMC-HVDC system.Firstly,the impedance model of a flexible MMC-HVDC converter station and an offshore wind farm is built by harmonic linearization,and then the impedance model of PMSG-based wind farm integration through the MMC-HVDC system considering the frequency coupling effect is derived.Secondly,based on the impedance-based stability criterion,the influence of circulation control on MMC impedance and the MMC-HVDC system’s stability is revealed,and then an MMC impedance remodeling control based on the circulation link is proposed.Finally,the stability analysis and the impedance modeling method are verified by RT-LAB hardware in the loop real-time simulation system.

关 键 词：海上风电 模块化多电平换流器 阻抗重塑 阻抗模型 稳定性分析 

分 类 号：TM614[电气工程—电力系统及自动化] TM712