基于电气外特性的光伏发电系统模型等效方法

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摘要光伏发电系统模型复杂,仿真计算时需要多次迭代,不适用于大量光伏电源接入电网的仿真分析与计算,为此本文提出了一种基于电气外特性的光伏发电系统模型等效方法。通过基于对光伏发电系统的稳态和暂态外特性的分析,将动态模型等效转换为一个具有二阶动态电路特性的受控电压源模型。该动态等效模型只需要利用光照强度、温度以及故障信息作为输入量,以获得故障前后的稳态输出电流,并在确定其动态电路的相关参数后完成整个模型的建立,故后续仿真计算时不再需要迭代。基于Matlab/Simulink平台搭建了光伏发电系统并网仿真模型,仿真结果表明,采用该等效模型在保证计算精度的前提下,可以有效提高仿真效率,具有良好的工程实用价值。

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	刘兴杰
	郭栋
	王凯龙

关键词 ：光伏发电系统, 动态模型, 等效建模, 电气外特性

Abstract：The model of the photovoltaic power generation system is complex, and it requires multiple iterations in calculation, which is not available for simulation analysis and calculation when a large number of PV power connected to the grid. This paper presents an equivalent method for PV system model based on electric external characteristic. Based on the analysis of steady-state and transient characteristics of photovoltaic power generation systems, the dynamic model is equivalent to a controlled voltage source circuit model with a second order dynamic characteristic. It only need to use the light intensity, temperature, and the fault information as input, and calculate the steady-state output current before and after the fault. After determining its relevant parameters, the modeling is completed, which is no longer required iterations at the time of simulation. Based on Matlab/Simulink platform the model of PV grid-connected systems is set up. Simulation results show that using the equivalent model to simulate, on the premise of guarantee the accuracy it can improve the efficiency of the simulation, and has the good engineering practical value.

Key words： Photovoltaic systems dynamic model equivalent modeling electrical external characteristics

收稿日期: 2014-01-08 出版日期: 2014-11-05

PACS:

TM615

作者简介: 刘兴杰男,1979年生,博士,副教授,研究方向为新能源发电与并网技术,电力系统自动化技术。郭栋男,1990年生,硕士研究生,研究方向为新能源发电与并网技术。

引用本文:

刘兴杰, 郭栋, 王凯龙. 基于电气外特性的光伏发电系统模型等效方法[J]. 电工技术学报, 2014, 29(10): 231-238. Liu Xingjie, Guo Dong, Wang Kailong. Equivalent Modeling Method for PV System Based on Its Electric External Characteristics. Transactions of China Electrotechnical Society, 2014, 29(10): 231-238.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2014/V29/I10/231

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