光伏并网系统的MATLAB快速仿真模型研究

Research on fast simulation models of photovoltaic generation system based on MATLAB

以光伏发电系统的数学模型为基础,给出了其基于MATLAB/Simulink的仿真模型。针对传统仿真方法快速性、鲁棒性较差的缺陷,分析了两种基于逆变器的等效简化模型—等效开关模型与平均模型,并从仿真速度、精度及鲁棒性等方面对上述模型进行对比。此外,针对大规模光伏发电系统接入电网的情况,提出一种可用于快速仿真的相量模型,有助于电力系统的快速潮流计算与暂态特性分析,其有效性通过仿真对比得到了验证。最后,对四种仿真模型进行综合对比,提出了各种仿真方法的适用场合。

A detailed simulation model of photovoltaic （PV） generation system based on MATLAB/Simulink is estab-lished, which is based on its detailed mathematical presentation. Its inverter-based simplified models, i.e. the switc-hing-function equivalent model and average model, are proposed and simulated, overcoming the limits of traditionalmethod in simulation speed and robustness. Quantitative comparisons are made between these methods from differentaspects, including the simulation speed, accuracy as well as robustness to step-size. Besides, a novel phasor simula-tion model of the grid-connected PV generation system, which significantly improves the simulation speed and is suit-able for the fast analysis of power flow and electromagnetic transient behavior, is proposed. The validity and utility ofthe proposed phasor model are verified by comparing the steady-state performance with the detailed model. Finally,the applications of each method are proposed based on the aforementioned comparison of four kinds of simulation mod-els.