两级式单相光伏并网逆变器的控制策略研究
发布时间：2019-03-30 23:01
【摘要】：随着环境污染及能源短缺的日益严重，世界各国越来越注重对可再生清洁能源的开发与利用，太阳能由于其分布广泛、可以循环利用等特点得到广泛应用，，光伏发电作为太阳能利用的主要形式，也得到了快速发展。光伏并网逆变器作为光伏发电系统的核心部件，其拓扑及控制策略的选择对光伏发电系统各方面性能起到决定作用。 本文主要研究了两级式单相光伏并网逆变器的不同控制策略对光伏逆变系统的体积、效率和控制性能等方面的影响。论文首先分析了两级式光伏并网逆变器传统控制策略的具体实现方法，在此基础上对基于扰动观察法的最大功率点跟踪算法参数的优化选取展开了讨论，并建立了采用电压、电流双闭环控制的系统数学模型，为控制参数的优化奠定了理论基础。其次，研究了一种新型的分时复合控制策略，对其入网电流控制部分建立了数学模型并进行了优化设计；同时，深入分析了光伏侧电压二次脉动产生的原因及对应抑制方法，提出一种基于分时复合控制策略的最大功率点跟踪方法；分析了光伏阵列输出电压波动对光伏电池利用率的影响，推导了端电压波动和光伏电池利用率之间内在关系，并提出了电路主要储能元件的参数设计方法。最后，介绍了损耗分析的基本原理和逆变电路开关器件损耗计算方法，并针对两种控制策略分别进行了损耗分析，从理论上比较了基于两种控制策略的电路损耗分布情况及其对系统效率的影响。 本文在MATLAB/Simulink环境下，搭建了两级式光伏并网逆变器不同控制策略的仿真模型，在理论分析和仿真的基础上，搭建了两台基于TMS320F2808型DSP的光伏并逆变器实验平台，对两种控制策略的硬件和软件进行了设计，通过硬件平台对前文的理论分析和光伏并网逆变器的各项基本功能开展了实验验证。仿真和实验结果表明：两种控制策略均可以保证光伏并网逆变器正常工作；在相同功率等级下，分时复合控制策略比传统控制策略损耗小、效率高，但是两种控制策略的变换器体积并无明显差别；同时，分时复合控制在实现容易程度、稳定性及并网电流THD方面较传统控制策略要差。
[Abstract]:With the increasingly serious environmental pollution and energy shortage, more and more countries in the world pay more and more attention to the development and utilization of renewable clean energy. Solar energy is widely used because of its wide distribution and can be recycled. Photovoltaic power generation, as the main form of solar energy utilization, has also been rapidly developed. Photovoltaic grid-connected inverter is the core component of photovoltaic power generation system. The choice of topology and control strategy plays a decisive role in the performance of photovoltaic power generation system. In this paper, the influence of different control strategies of two-stage single-phase photovoltaic grid-connected inverter on the volume, efficiency and control performance of photovoltaic inverter system is studied. Based on the analysis of the traditional control strategy of the two-stage photovoltaic grid-connected inverter, the optimal selection of the parameters of the maximum power point tracking algorithm based on the disturbance observation method is discussed, and the voltage is established, which is based on the analysis of the traditional control strategy of the two-stage photovoltaic grid-connected inverter. The mathematical model of the current double closed loop control system lays a theoretical foundation for the optimization of the control parameters. Secondly, a new time-sharing compound control strategy is studied, and the mathematical model of the current control part is established and the optimization design is carried out. At the same time, the causes of the secondary voltage pulsation on the photovoltaic side and the corresponding suppression methods are deeply analyzed, and a maximum power point tracking method based on the time-sharing compound control strategy is proposed. The influence of output voltage fluctuation of photovoltaic array on the utilization efficiency of photovoltaic cells is analyzed. The intrinsic relationship between terminal voltage fluctuation and utilization ratio of photovoltaic cells is deduced. The parameter design method of the main energy storage elements in the circuit is proposed. Finally, the basic principle of loss analysis and the calculation method of switching device loss of inverter circuit are introduced, and the loss analysis of two control strategies are carried out respectively. The circuit loss distribution based on two control strategies and its influence on system efficiency are compared theoretically. In this paper, the simulation models of two-stage photovoltaic grid-connected inverter with different control strategies are built under the environment of MATLAB/Simulink. On the basis of theoretical analysis and simulation, two experimental platforms of photovoltaic parallel inverter based on TMS320F2808 DSP are built. The hardware and software of the two control strategies are designed. The theoretical analysis above and the basic functions of photovoltaic grid-connected inverter are verified by the hardware platform. The simulation and experimental results show that the two control strategies can ensure the grid-connected photovoltaic inverter to work normally. Under the same power level, the time-sharing compound control strategy has less loss and higher efficiency than the traditional control strategy, but there is no obvious difference in the converter volume between the two control strategies. At the same time, the time-sharing compound control is worse than the traditional control strategy in the aspects of the ease of realization, the stability and the grid-connected current THD.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM464
本文编号：2450570
[Abstract]:With the increasingly serious environmental pollution and energy shortage, more and more countries in the world pay more and more attention to the development and utilization of renewable clean energy. Solar energy is widely used because of its wide distribution and can be recycled. Photovoltaic power generation, as the main form of solar energy utilization, has also been rapidly developed. Photovoltaic grid-connected inverter is the core component of photovoltaic power generation system. The choice of topology and control strategy plays a decisive role in the performance of photovoltaic power generation system. In this paper, the influence of different control strategies of two-stage single-phase photovoltaic grid-connected inverter on the volume, efficiency and control performance of photovoltaic inverter system is studied. Based on the analysis of the traditional control strategy of the two-stage photovoltaic grid-connected inverter, the optimal selection of the parameters of the maximum power point tracking algorithm based on the disturbance observation method is discussed, and the voltage is established, which is based on the analysis of the traditional control strategy of the two-stage photovoltaic grid-connected inverter. The mathematical model of the current double closed loop control system lays a theoretical foundation for the optimization of the control parameters. Secondly, a new time-sharing compound control strategy is studied, and the mathematical model of the current control part is established and the optimization design is carried out. At the same time, the causes of the secondary voltage pulsation on the photovoltaic side and the corresponding suppression methods are deeply analyzed, and a maximum power point tracking method based on the time-sharing compound control strategy is proposed. The influence of output voltage fluctuation of photovoltaic array on the utilization efficiency of photovoltaic cells is analyzed. The intrinsic relationship between terminal voltage fluctuation and utilization ratio of photovoltaic cells is deduced. The parameter design method of the main energy storage elements in the circuit is proposed. Finally, the basic principle of loss analysis and the calculation method of switching device loss of inverter circuit are introduced, and the loss analysis of two control strategies are carried out respectively. The circuit loss distribution based on two control strategies and its influence on system efficiency are compared theoretically. In this paper, the simulation models of two-stage photovoltaic grid-connected inverter with different control strategies are built under the environment of MATLAB/Simulink. On the basis of theoretical analysis and simulation, two experimental platforms of photovoltaic parallel inverter based on TMS320F2808 DSP are built. The hardware and software of the two control strategies are designed. The theoretical analysis above and the basic functions of photovoltaic grid-connected inverter are verified by the hardware platform. The simulation and experimental results show that the two control strategies can ensure the grid-connected photovoltaic inverter to work normally. Under the same power level, the time-sharing compound control strategy has less loss and higher efficiency than the traditional control strategy, but there is no obvious difference in the converter volume between the two control strategies. At the same time, the time-sharing compound control is worse than the traditional control strategy in the aspects of the ease of realization, the stability and the grid-connected current THD.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM464
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