光伏并网逆变器的重复控制研究

发布时间：2018-07-05 08:09

本文选题：光伏并网发电 + 重复控制　；参考：《湘潭大学》2014年硕士论文

【摘要】：在传统能源日渐枯竭的今天，作为被大力提倡的绿色能源之一，太阳能光伏发电的机遇与挑战并存。基于内模原理的重复控制，通过在控制反馈闭环过程中加入外部激励周期性信号的产生模型，该模型能够对周期信号进行零稳态误差跟踪抑制。本文通过理论分析太阳能光伏并网系统系的逆变器传统控制策略，指出其所存在的不足，并在这一基础上引入太阳能光伏并网逆变器的重复控制方法。首先通过分析数种太阳能光伏并网逆变器拓扑结构，建立了PI双环控制，输出反馈，状态观测器等太阳能光伏并网逆变重复控制器结构，，并依次构建其物理模型。并在这一过程中，从坐标变换的角度，证明了传统PI控制策略无法无静差跟踪周期信号的本质，同时论述了并网逆变器在光伏系统中的重要性和独立性。接着从频域分析基于双环太阳能光伏并网逆变重复控制器的物理模型，计算获得其开闭环传递函数，建立其H模型，通过matlab工具箱hinfsyn求解其待定参数，在此基础上建立matlab数值仿真模型，分析设计双环太阳能光伏并网逆变重复控制器的可行性。对于基于状态观测器的太阳能光伏并网逆变重复控制器物理模型，本文通过理论推导，重构状态空间方程，将其转化为离散二维模型。然后构建其李雅普诺夫泛函，并证明该李雅普诺夫泛函的保守性，给出了状态观测器参数的线性矩阵不等式(LMI)求解方法，在此基础上，搭建了matlab数学仿真模型，最后采用基于Concerto微处理器的太阳能光伏并网实验平台验证该方法的实用性。对于基于输出反馈的太阳能光伏并网逆变重复控制器，本文从线性矩阵不等式(LMI)的角度，进行理论推导，得到该太阳能光伏并网逆变重复控制器的H2/H混合多目的鲁棒稳定条件。在数值求解过程中，应用了matlab的多种软件工具箱，有效地简化了计算求解过程，并通过数值仿真验证了该设计控制方法具有稳定性好，谐波含量低，收敛速度快等优点。本文对于数种太阳能光伏并网逆变重复控制器，采用了不同的理论分析手段和策略，如频域分析，开闭环传递函数，线性矩阵不等式(linear matrix inequalities,LMI)，并结合现代控制理论中的李雅普诺夫方法，鲁棒控制理论，最后通过多个数值仿真及实物实验验证了所设计方法的可行性，为在应用领域的重复控制器的设计提供了设计思路和一定的参考价值。
[Abstract]:As one of the green energy sources, the opportunities and challenges of solar photovoltaic power generation coexist. Based on the repetitive control of internal model principle, by adding the generation model of external excitation periodic signal in the closed-loop process of control feedback, the model can suppress the zero steady-state error tracking of the periodic signal. Based on the theoretical analysis of the traditional inverter control strategy of solar photovoltaic grid-connected system, the shortcomings of the inverter are pointed out, and the repetitive control method of solar photovoltaic grid-connected inverter is introduced on this basis. Firstly, by analyzing the topology of several solar photovoltaic grid-connected inverters, Pi double-loop control, output feedback, state observer and other solar photovoltaic grid-connected inverter repetitive controller structures are established, and their physical models are constructed in turn. In this process, from the point of view of coordinate transformation, it is proved that the traditional Pi control strategy can not track the nature of periodic signal without static error, and the importance and independence of grid-connected inverter in photovoltaic system are discussed. Then the physical model based on double-loop solar photovoltaic grid-connected repetitive controller is analyzed in frequency domain. The open and closed loop transfer function is obtained and its H model is established. The undetermined parameters are solved by hinfsyn of matlab toolbox. On this basis, the matlab numerical simulation model is established, and the feasibility of designing double ring solar photovoltaic grid-connected inverter repetitive controller is analyzed. For the physical model of solar photovoltaic grid-connected repetitive controller based on state observer, this paper reconstructs the state space equation by theoretical derivation and transforms it into discrete two-dimensional model. Then the Lyapunov functional is constructed, and the conservatism of the Lyapunov functional is proved. The linear matrix inequality (LMI) solution method for the parameters of the state observer is given. On this basis, the matlab mathematical simulation model is built. Finally, a solar photovoltaic grid-connected experimental platform based on Concerto microprocessor is used to verify the practicability of the method. For the solar photovoltaic grid-connected inverter repetitive controller based on output feedback, the H _ 2 / H hybrid multi-purpose robust stability condition of the solar photovoltaic grid-connected repetitive controller is derived theoretically from the point of view of linear matrix inequality (LMI). In the process of numerical solution, several software toolboxes of matlab are used to simplify the calculation process effectively. The numerical simulation shows that the design control method has the advantages of good stability, low harmonic content and fast convergence speed. In this paper, several kinds of solar photovoltaic grid-connected inverter repetitive controllers are analyzed by different theoretical methods and strategies, such as frequency-domain analysis, open-closed-loop transfer function. Linear matrix inequality (LMI), combined with Lyapunov method and robust control theory in modern control theory, the feasibility of the proposed method is verified by several numerical simulations and physical experiments. It provides the design idea and certain reference value for the design of repetitive controller in application field.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM464

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