光伏离网和并网逆变器的非线性动力学行为、控制与同步研究

First, according to the circuit theory, several models of photovoltaic off-grid and grid-connected inverter are established. by using nonlinear dynamics theory and method, various dynamic behaviors of the system models,such as the stability,the bifurcation and chaos behavior is fully researched and the relationship between the structure and parameters of circuit and physical properties of circuit,such as the stability, efficiency, power factor, harmonic suppression is revealed. Based on the fully theoretical analysis above, by using different nonlinear control and chaos control methods ,control are studied for the 0ff-gird and grid-connected inverter to explor the best control strategy and to improve various physical properties of off-grid and grid-connected inverters.Next, the new technology of Islanding detection and new synchronization methods between the photovoltaic grid-connected inverter and main-grid is explored by using chaos synchronization theory and Chaos detection technology.Finally,the nonlinear dynamics modeling and dynamics behavior of distributional photovoltaic power generation is further studied drawing on of complex network's theory and method.The study of this project not only has more important theoretical instructional value for the design of photovoltaic off-gird and grid-connected inverter with high performance ,but also has more important theoretical significance and application value for high efficiency, the safe and stable operation on distributional photovoltaic grid-connected power generation system.

本项目首先根据电路理论，对几种光伏离网和并网逆变器进行建模，应用非线性动力学理论和方法深入研究系统模型的稳定性、分岔和混沌等各种动力学行为,揭示电路结构、参数与其稳定性、效率、功率因素、谐波抑制等物理特性的关系；其次，在深入理论分析的基础上，采用不同非线性控制和混沌控制的方法，对离网和并网逆变器进行控制研究，探索最佳的控制策略，提高离网和并网逆变器的各种物理性能；然后利用混沌同步理论和混沌检测技术，探索光伏并网逆变器与主电网同步的新方法和孤岛检测的新技术。最后，借鉴复杂网路的理论与方法，进一步研究分布式光伏发电网的非线性动力学建模和动力学行为。本项目的研究不仅对高性能的光伏离网和并网逆变器设计具有重要的理论指导价值，而且对光伏分布式并网发电系统的高效、安全稳定运行具有较重要的理论意义和应用价值。

本项目主要完成了如下四个方面的研究工作：.第一，建立了单相全桥光伏逆变器的动力学模型，应用非线性动力学理论和方法深入研究系统模型的稳定性、分岔和混沌等动力学行为,揭示电路结构、参数对系统动力学行为的影响，以探索最佳的控制策略，提高逆变器的各种物理性能；第二，建立了光伏微网系统的复杂网络模型，利用混沌同步理论研究了光伏并网逆变器与主电网同步的新方法，并设计了基于神经网络、数字控制等的同步新方法；第三，研究并设计了基于改进型变步长电压扰动观察法、多核处理器的最大功率点跟踪（MPPT）控制方法，提高了光伏发电的转换效率；第四，考虑真实光伏发电系统强非线性特性，在深入研究光伏并网逆变器的分岔、混沌等动力学行为基础上，研究了一种基于混沌检测的孤岛检测方法，提高孤岛检测的灵敏度，同时研究了基于模糊控制、复小波分析理论的改进孤岛检测方法，为光伏并网发电系统孤岛检测提供新的途径。.项目研究结果不仅对高性能的光伏离网和并网逆变器设计具有重要的理论指导价值，而且对光伏分布式并网发电系统的高效、安全稳定运行具有较重要的理论意义和应用价值。