摘要
为了分析参与电网一次调频的风电系统对电力系统稳定性的影响,建立基于直驱永磁型风电系统的单机无穷大系统小扰动稳定性分析数学模型。根据风速的变化,在额定风速以下采用最大功率点追踪控制,以实现风电系统输出功率最大;额定风速以上采用恒功率控制,保证风电系统安全运行。研究考虑负荷动态模型时风速变化对系统特征值的影响,结果表明,在整个风速变化区间系统均能保持小扰动稳定。在理论分析的基础上进行时域仿真,来验证理论分析的正确性。仿真结果表明,风电系统能够参与电网一次调频,可有效改善电网的频率特性,为直驱型风电安全稳定并网运行提供了可借鉴的理论依据。
The effect of wind power system which participated in grid primary frequency regulation on power system stability was analyzed, a small signal stability analysis mathematical model of single machine infinite system base on directly driven permanent magnet wind power system was established. According to wind speed variation, under rated wind speed, wind power system was controlled by maximum power point tracking （MPPT） scheme, wind power system maximum output power was realized;above rated wind speed, constant power control scheme was adopted, system safe operation was guaranteed. Eigenvalues variation with wind speed change was researched when load dynamic model considered, the result shows power system can keep small signal stability in whole wind speed variation section. On theory analysis basis, time domain simulation was performed and theory analysis correctness was tested. Simulation result shows wind power system can participate in grid primary frequency regulation and effectively improve grid frequency characteristics, which provides useful theory reference for stable and safe connected operation of direct-driven wind power system.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2011年第13期1-9,共9页
Proceedings of the CSEE
关键词
一次调频
直驱永磁风电系统
小扰动稳定
最大功率点跟踪
primary frequency regulation
directly driven permanent magnet wind power system
small signal stability
maximum power point tracking
