光伏并网系统小信号动态建模及控制参数灵敏度分析  

Small-signal dynamic modeling of grid-connected PV system and eigenvalue sensitivity analysis of the controller parameters

作　　者：周林[1] 李怀花[1] 张林强[1] 廖波[1] 龙崦平[1] 杜金其 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030

出　　处：《电力系统保护与控制》2013年第5期1-5,共5页Power System Protection and Control

摘　　要：现有光伏并网系统小信号稳定性分析中,通常对逆变器采用理想建模,没有考虑控制参数对小信号稳定性的影响。为准确分析光伏并网系统的动态性能,建立了两级式三相并网光伏系统的小信号动态模型,主要包括两个子模型:主电路模型和MPPT、电压电流双闭环控制系统模型。利用该模型计算了控制系统参数对并网系统特征值的灵敏度,分析了各个控制参数对系统小干扰稳定性的影响。分析结果表明,通过合理地选择控制参数可以改善系统的小干扰稳定性,为控制器的优化设计提供理论依据。The ideal inverter models are currently used to analyze the small-signal stability of the grid-connected PV system, which did not consider the impact of the control parameter. To analyze the dynamics of the photovoltaic grid-connected system, a complete small-signal model of two-stage three-phase grid-connected PV system is developed. This integrated model consists of two sub-models： one is the model of main circuit, the other is the model of double closed-loop control system of MPPT and voltage and current. Based on the above model, the parameters of the control system on the grid system eigenvalue sensitivity are calculated, and the impact of each controller parameters on the system small signal stability is analyzed. The analysis result shows that the small signal stability of the system can be improved by adjusting the controller parameters, and provides a theoretical basis for optimization design of the controller.

关 键 词：光伏并网系统 小信号动态模型 控制参数 特征值灵敏度 小干扰稳定性 

分 类 号：TM712[电气工程—电力系统及自动化]