摘要
研究了两级式三相光伏并网发电系统的小干扰稳定性.建立了完整的小信号模型,包含光伏阵列出口侧稳压电容、Boost电路、L滤波器、MPPT控制器和并网逆变控制器.基于PSCAD/EMTDC的仿真模型,利用特征值分析法研究了系统的小干扰稳定性,计算了控制器参数变化时的系统特征值轨迹,据此调整控制器参数.小信号分析与仿真结果表明,合理调整控制器参数,可以提高系统的小干扰稳定性.
The small-signal stability of a two-stage three-phase grid-connected PV system is analyzed by means of eigenvalues analysis. A complete small-signal model of the system including voltage stabilizing capacitor, Boost circuit, L filter, MPPT controller and controller for grid- connected inverter is developed. The eigenvalues traces as the controller' s parameters variation are calculated, according to which the controller' s parameters are adjusted. Additionally, a simulation model of the system based on PSCAD/EMTDC is built. The small-signal analysis and the simulation results show that reasonable adjusting of the controller' s parameters can improve the small-signal stability of the system.
出处
《上海电力学院学报》
CAS
2014年第1期27-31,35,共6页
Journal of Shanghai University of Electric Power
基金
国家863高技术基金(2011AA05A106)
上海市科学技术委员会重点科技攻关计划(11dz1210405)
曙光计划(10SG51)
关键词
光伏并网发电
小干扰稳定性
小信号建模
特征值分析
grid-connected photovoltaic generation
small-signal stability
small-signalmodeling
eigenvalue analysis