弱电网下直驱风机网侧换流器建模及稳定运行控制策略分析  

Modeling and stable operation control strategy analysis for grid-side converter of direct-drive permanent magnetic synchronous generator in weak grid

作　　者：朱瑛[1] 何飞 蔡寿国 卫志农[1] ZHU Ying;HE Fei;CAI Shouguo;WEI Zhinong(College of Energy and Electrical Engineering,Hohai University,Nanjing 211100,China)

机构地区：[1]河海大学能源与电气学院,江苏南京211100

出　　处：《电力自动化设备》2023年第9期71-78,共8页Electric Power Automation Equipment

基　　金：国家自然科学基金联合基金资助项目(U1966205);中央高校基本科研业务费专项资金资助项目(B210202067)。

摘　　要：直驱风机网侧换流器可能因与弱电网动态交互引发系统失稳问题.为探究系统的交互机理,保证系统的稳定运行,首先对直驱风机并网模型进行了合理简化,建立了弱电网下直驱风机网侧换流器与电网交互的单输入单输出传递函数模型,并应用经典频域判据进行稳定性分析,探究电气与控制环节对于系统稳定性的影响.其次在分析锁相环导致系统失稳的原因基础上,提出了一种新型3阶锁相环控制结构设计方案,并对锁相环参数进行了多目标优化设计.结果表明,3阶锁相环具有更好的谐波衰减效果,在短路比为2的极弱电网下仍可以保持稳定运行.最后基于MATLAB/Simulink仿真平台验证了所提设计方案的有效性.The instability may be caused by the dynamic interaction between the grid-side converter of direct-drive permanent magnetic synchronous generator and weak grid.In order to explore the interaction mecha⁃nism of the system and ensure the stable operation of the system,firstly,the grid-connected model of direct-drive permanent magnetic synchronous generator is reasonably simplified,and the single-input single-output(SISO)transfer function model of the interaction between grid-side converter of direct-drive permanent magnetic synchronous generator and power system under weak grid condition is established.The classical frequency domain criterion is used to analyze the stability and explore the influence of electrical and con⁃trol links on the stability of the system.Secondly,based on the reason analysis of the system instability caused by the phase locked loop,a new three-order phase locked loop control structure design scheme is proposed.The results show that the third-order phase locked loop has better harmonic attenuation effect,and can still maintain stable operation in extremely weak power grids with a short circuit ratio of 2.Finally,the effectiveness of the proposed design scheme is verified based on MATLAB/Simulink simulation platform.

关 键 词：弱电网 直驱风机网侧换流器 单输入单输出传递函数 3阶锁相环 参数设计 

分 类 号：TM46[电气工程—电器] TM614