摘要
光伏并网发电系统的核心部件是并网逆变器,其建模、仿真、控制方法等方面的研究与设计都需要逆变器的数学模型,但在实际情况中往往难以获取,即使厂家提供也难以判断其准确性。该文将基于Wiener模型的非线性系统辨识技术引入到光伏并网逆变器的建模当中。新方法将单相光伏并网逆变器视为双输入双输出的非线性黑箱系统,仅基于并网逆变器输入输出两侧的外部测量数据即可完成系统辨识建模。该方法在7.68 kW光伏并网发电系统中进行实验,并与已有的Hammerstein-Wiener模型对比分析。结果表明,提出的单相光伏并网逆变器Wiener模型及其辨识建模方法,能更好地反映实际并网逆变器在不同天气条件下的动态行为,为并网逆变器的建模提供了一种新的有效途径。
The research and design of modeling, simulation, and control methods of the grid-connected photovoltaic system requires a mathematical model of the inverter, which is the core of the system. However, in reality, this is often difficult to be obtained. Though the model is provided by the manufacturer, it is difficult to judge its accuracy. This paper introduced the nonlinear system identification technique into the photovoltaic grid-connected inverter modeling based on the Wiener model. This new method considered the single-phase inverter as a dual-input and dual-output nonlinear black box, and yielded the model from certain measured inputs and outputs of the inverter. Experiments had been conducted in a 7.68 kW grid-tied photovoltaic system. Comparative analysis had been done with the existing Hammerstein-Wiener model. The results show that the proposed Wiener model and the identification approach of the single-phase photovoltaic grid-connected inverter can be better than the Hammerstein-Wiener model to reflect the dynamic behavior of the actual grid-tied inverter under different weather conditions. And it provides a new and effective way for the grid-connected inverter modeling.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2013年第36期18-26,5,共9页
Proceedings of the CSEE
基金
国家高技术研究发展计划(863)(2011AA05A107)
输配电装备及系统安全与新技术国家重点实验室自主研究重点项目(2007DA10512711102)~~
