物理学报Issue(13)：1-9,9.DOI:10.7498/aps.64.130503
两级式光伏并网逆变器建模与非线性动力学行为研究∗
Numerical mo deling and research on nonlinear dynamic b ehaviors of two-stage photovoltaic grid-connected inverter
摘要
Abstract
In this paper, the piecewise smooth state equation of a two-stage photovoltaic grid-connected (TPG) inverter is established and studied; based on the solution to the piecewise smooth state equation of the TPG inverter, effects of the photovoltaic array voltage on nonlinear dynamical behaviors of the TPG inverter are analyzed by using bifurcation diagram, folded diagram, 3D phase diagram, and Poincaré section. Then the nonlinear dynamical behaviors of TPG inverter are compared with the conventional one. And a strategy of expanding the input voltage range for the TPG inverter is explored. Finally, the nonlinear dynamical behaviors in it caused by the variation of main circuit parameters:such as the output inductance and capacitance of the front-stage, as well as those of the second-stage, are discussed through slow-scale bifurcation diagrams. Studies have found that it is effective to expand the input voltage range of the TPG inverter by segment control of the photovoltaic array voltage, and the chaotic phenomena in the TPG inverter can be avoided by increasing the parameter values of inertial devices such as output inductance and capacitance in the front-stage appropriately, but the values of output inductance and capacitance in the second-stage should be away from the multiple noncontiguous region, since it can cause chaotic behavior. The above work may have important guiding significance and application for improving the stability and efficiency of two-stage photovoltaic grid-connected inverter based photovoltaic power generation system.关键词
两级式光伏并网逆变器/分段光滑/分岔现象/混沌Key words
two-stage photovoltaic grid-connected inverter/piecewise smooth/bifurcation/chaos引用本文复制引用
廖志贤,罗晓曙,黄国现..两级式光伏并网逆变器建模与非线性动力学行为研究∗[J].物理学报,2015,(13):1-9,9.基金项目
国家自然科学基金(批准号:11262004)和广西科学研究与技术开发计划(批准号:桂科攻1348017-2)资助的课题.* Project supported by the National Natural Science Foundation of China (Grant No.11262004) and the Science and Technology Development Program of Guangxi Province, China (Grant No.1348017-2) （批准号:11262004）
