单相并网逆变器的控制策略研究

发布时间：2018-08-18 12:17

【摘要】：随着社会的发展和传统能源的消耗以及传统能源带来的污染,可再生的清洁能源必然是社会发展的重点。太阳能依靠其取之不尽用之不竭的优点,在可再生能源中格外地受到关注,而光伏并网发电是以光伏并网逆变器作为最重要的环节,需对其进行深入研究。本文主要运用MATLAB工具来研究,深入研究了光伏电池的特点,采用合理的最大功率点跟踪算法和并网控制策略来对单相并网逆变器做了深入透彻地研究,文中详细的分析了其控制策略,建立了仿真模型并进行了仿真验证,本文的主要工作有以下几方面:(1)研究光伏电池的工作原理和其等效电路,推导出其数学模型,建立仿真通用模型,验证太阳光照、温度等参数对其输出性能的影响。(2)分析MPPT(Maximum Power Point Tracking)方法,使用已建好的光伏电池通用模型,验证PO(PerturbObserve)法,并针对PO法的两个缺点,提出一种能够针对不同的光照强度用模糊控制来自行调整扰动步长的改进PO法,并通过仿真来验证。(3)分析单相全桥逆变电路和其输出滤波环节,确定逆变器和滤波器类型,推导出逆变器主电路的数学模型,并在MATLAB中建模。(4)对并网控制策略中的比例积分PI控制、比例谐振PR控制、改进的比例谐振PR控制的原理进行分析对比,选择在控制器自身特性和抗电压干扰性较好的改进PR控制方法并进行仿真验证。
[Abstract]:With the development of society, the consumption of traditional energy and the pollution caused by traditional energy, renewable clean energy is the focus of social development. Solar energy, which depends on its inexhaustible advantages, has attracted more and more attention in renewable energy, and grid-connected photovoltaic power generation is the most important link of photovoltaic grid-connected inverter, which needs to be deeply studied. In this paper, the characteristics of photovoltaic cells are studied with MATLAB tools, and the maximum power point tracking algorithm and grid-connected control strategy are used to deeply and thoroughly study single-phase grid-connected inverters. In this paper, the control strategy is analyzed in detail, the simulation model is established and verified. The main work of this paper is as follows: (1) the working principle and equivalent circuit of photovoltaic cell are studied, and its mathematical model is deduced. A general simulation model is established to verify the influence of solar illumination and temperature on the output performance. (2) the MPPT (Maximum Power Point Tracking) method is analyzed and the established general model of photovoltaic cell is used to verify the PO (PerturbObserve) method. An improved PO method, which can adjust the disturbance step size by fuzzy control according to different illumination intensity, is proposed and verified by simulation. (3) the single-phase full-bridge inverter circuit and its output filter are analyzed, and the type of inverter and filter is determined. The mathematical model of inverter main circuit is derived and modeled in MATLAB. (4) the principle of proportional integral Pi control, proportional resonance PR control and improved proportional resonance PR control are analyzed and compared in grid-connected control strategy. The improved PR control method, which has good characteristics of controller and voltage interference resistance, is selected and verified by simulation.
【学位授予单位】：新疆大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM464

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