电力系统自动化2025，Vol.49Issue(17)：68-80,13.DOI:10.7500/AEPS20250106006
海上风电-柔直与常规直流混合馈入系统谐振稳定性分析及优化
Analysis and Optimization of Resonance Stability for MMC-HVDC and LCC-HVDC Hybrid Infeed System of Offshore Wind Power
摘要
Abstract
When the receiving-end landing point distance of the offshore wind power with modular multilevel converter based high voltage direct current(MMC-HVDC)grid-connection project is close to that of the line-commutated converter based high voltage direct current(LCC-HVDC)project,a hybrid multi-feed DC(HMIDC)transmission system is formed,but the resonant characteristics of this system are still unclear.To address this,this paper develops the transfer function calculation models for line-commutated converters(LCCs)and modular multilevel converters(MMCs)based on generalized average theory.On this basis,by adopting the harmonic impedance model of long-distance DC transmission lines considering the frequency variation distribution characteristics and relying on the typical control structures and case parameters of actual engineering,a linearized frequency-domain model of the MMC-HVDC and LCC-HVDC hybrid infeed system of offshore wind power is established.Then,the single-input single-output equivalent AC admittance characterizing the stability of the system is derived,and the potential resonance problem of the system is analyzed.The influence of controller interactions among the MMC-HVDC and LCC-HVDC transmission system of offshore wind power,flexible DC converter stations and conventional DC converter stations is explored.Additionally,the influence of DC power,tie-line length,and reactive power output of converter stations on the stability characteristics of the system is investigated.Finally,a impedance reshaping strategy based on AC feedback is proposed,and the effectiveness of the proposed controller is verified in the electromagnetic transient simulation model of PSCAD/EMTDC.关键词
海上风电/基于模块化多电平换流器的高压直流/混合多馈入系统/谐振/阻抗重塑/稳定性/广义平均理论Key words
offshore wind power/modular multilevel converter based high voltage direct current(MMC-HVDC)/hybrid multi-infeed system/resonance/impedance reshaping/stability/generalized average theory引用本文复制引用
叶柏贤,王学梅,刘航,廖芳群,汪娟娟..海上风电-柔直与常规直流混合馈入系统谐振稳定性分析及优化[J].电力系统自动化,2025,49(17):68-80,13.基金项目
智能电网重大专项(2030)资助项目(2024ZD0800905) （2030）
广东省自然科学基金面上项目(2024A1515010050). This work is supported by Smart Grid-National Science and Technology Major Project(No.2024ZD0800905)and Guangdong Provincial Natural Science Foundation of China(No.2024A1515010050). （2024A1515010050）
