物理学报Issue(12)：1-9,9.DOI:10.7498/aps.63.120510
考虑死区非线性的L滤波单相并网逆变器的精确离散迭代模型及其分岔行为
An exact discrete-time mo del and the bifurcation p erformance of single phase grid-connected inverter with L-filter considering dead-time nonlinearity
摘要
Abstract
Grid-connected inverter system is recognized as a time-varying nonlinear system, and it has complex nonlinear behaviors in practice. However, the introduction of dead-time nonlinearity can make the nonlinear behaviors of the system more complex and harder to predict. In this paper, the proportional control single-phase grid-connected inverter with L-filter considering dead-time nonlinearity is investigated. The observation of current waveforms under fixed controller parameter and different dead-time parameters shows that the bifurcation phenomenon occurs with the increase of dead-time. According to the features of dead-time nonlinearity and the zero current clamping phenomenon caused by dead-time, an exact and complete discrete-time model is established by comprehensively considering the system from various aspects. And the theoretical analysis of bifurcation behaviors of system is carried out based on the proposed model. Moreover, the stability judgment has engineering significance. However, with the consideration of dead-time nonlinearity, analytical methods are difficult to use and the graphic methods do not have satisfactory accuracy. Therefore, a stability criterion based on equivalent duty ratio is proposed in this paper, which can accurately judge the stability boundary and provide reliable references for the parameter design of controller and dead-time.关键词
并网逆变器/死区非线性/离散迭代模型/分岔行为Key words
grid-connected inverter/dead-time nonlinearity/discrete-time model/bifurcation behavior引用本文复制引用
谢瑞良,郝翔,王跃,杨旭,黄浪,王超,杨月红..考虑死区非线性的L滤波单相并网逆变器的精确离散迭代模型及其分岔行为[J].物理学报,2014,(12):1-9,9.基金项目
国家自然科学基金(批准号:51177129)和国家高技术研究发展计划(批准号:2011AA05A305)资助的课题.* Project supported by the National Natural Science Foundation of China (Grant No.51177129) and the National High Technology Research and Development Program of China (Grant No.2011AA05A305) （批准号:51177129）
