直驱风机接入弱电网的小干扰稳定分析及提升策略  

Small Disturbance Stability Analysis and Improvement Strategy for Direct-driven Wind Turbine Generators Connected to Weak Grid

作　　者：赵心悦 莫姝 吴岳 Zhao Xinyue;Mo Shu;Wu Yue(School of Electric Power Engineering,South China University of Technology,Guangzhou Guangdong 510641,China)

机构地区：[1]华南理工大学电力学院,广东广州510641

出　　处：《电气自动化》2024年第5期27-30,共4页Electrical Automation

摘　　要：针对直驱风机接入弱电网的失稳情况进行了小干扰分析,并提出了提升措施。建立了系统的小信号模型,采用模态分析法及根轨迹法研究了弱电网下的失稳机理,提出了一种改进q轴外环控制和改进锁相环控制的稳定性提升策略。结果表明,锁相环控制回路与定无功功率外环控制影响着系统在弱电网的稳定性。案例分析表明,采用改进措施的系统在弱电网中的稳定性显著提高。A small disturbance analysis was conducted on the instability of direct-driven wind turbines connected to weak grid,and the improvement measures were proposed.A small signal model of the system was established,and the instability mechanism under weak grid was studied using modal analysis and root locus methods.A stability enhancement strategy was proposed to improve the q-axis outer loop control and the phase-locked loop(PLL)control.The results indicate that the PLL control loop and the fixed reactive power outer loop control affect the stability of the system in weak grid.The case study shows that the stability of the system using improvement measures has significantly improved in weak grid.

关 键 词：直驱风机 弱电网 小干扰稳定 根轨迹 提升策略 

分 类 号：TM712[电气工程—电力系统及自动化]