摘要
基于模块化多电平换流器的柔性直流输电系统（modular multilevel converter-based high-voltage DC,MMC-HVDC）接入风电场时易出现次同步振荡现象。利用阻抗分析方法揭示了风电场经MMC-HVDC并网系统的次同步振荡产生机理。建立了MMC的谐波状态空间模型,在此基础上,利用谐波线性化原理推导了计及内部动态特性的MMC交流侧小信号阻抗模型。首先从单个装置的角度,分别设计了风电场侧MMC和风电并网逆变器的控制器参数。在此基础上,从系统的角度,提出了一种提高风场柔直并网系统稳定性的控制器参数优化设计方法,并讨论了换流器一次参数及工作模式等对优化结果的影响。基于Matlab/Simulink建立了风电场经MMC-HVDC并网系统的时域仿真模型,仿真结果验证了理论分析的正确性和所提方法的有效性。
Subsynchronous oscillation （SSO） phenomena may occur in a modular multilevel converter-based high-voltage DC （MMC-HVDC） transmission system for wind farm integration. The generation mechanism of the SSO phenomenon in an MMC-HVDC system for wind farm integration was revealed by using impedance-based analytical method. The harmonic state-space model of the MMC was established. Based on this, the ac-side small-signal impedance model of the MMC was derived by using the harmonic linearization principle, which takes the internal dynamic behaviors into account. From a point of view of single converter, the controller parameters of the wind farm side MMC （WFMMC） and wind power inverter were designed, respectively. On this base, from a point of view of system, an optimized design method for the controller parameters was proposed to enhance the stability of the interconnected system. The impacts of main circuit parameters and operating modes of the MMC on the optimized result were also discussed. A time-domain simulation model of wind farm integration via an MMC-HVDC system was built by Matlab/Simulink. The simulation results validate the correctness of the theoretical analysis and the effectiveness of the proposed method.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2018年第2期431-443,共13页
Proceedings of the CSEE
基金
国家重点研发计划课题(2016YFB0900901)
上海市科委科研计划项目(16DZ1203402)~~
关键词
风电场
高压直流输电
模块化多电平换流器
稳定性
稳定控制
阻抗
谐波状态空间
wind farm
high-voltage DC transmission （HVDC）
modular multilevel converter （MMC）
stability
stabilization control
impedance
harmonic state-space
