光伏发电系统并网控制及孤网运行策略研究

发布时间：2018-04-12 06:10

本文选题：光伏发电系统 + 并网运行　；参考：《天津理工大学》2017年硕士论文

【摘要】：能源作为国民经济发展的命脉,越来越受到世界各个国家关注。但随着经济的快速发展,两大问题已经浮现出来,即能源危机和环境污染。光伏发电作为太阳能利用方式中最为普遍的方式,研究其理论及实际应用对于解决能源危机,环境污染,实现绿色可持续发展具有重要的理论与实际意义。本文的研究内容如下:1.本文介绍了光伏发电系统的几大关键技术,尤其是并网光伏和光伏孤网运行,对其目前的发展现状做了分析与比较;对自抗扰技术的基本原理做了介绍,阐述了自抗扰技术如何吸取了PID的优势,即基于误差消除误差的思想,介绍了线性自抗扰控制的基本原理,是一种优化参数调整的自抗扰技术,最后对线性自抗扰控制器的稳定性进行了证明,为下面的研究打下了理论基础。2.本文建立了并网光伏系统数学模型,并对三相系统进行了坐标变换,揭示出电流控制环中有功功率电流与无功功率电流之间存在耦合关系,运用LADRC对耦合问题设计控制器,进行了解耦,并利用系统的模型系统信息降低了观测器的带宽。通过仿真验证,其输出电压响应速度快,具有良好的正弦度,证明了并网光伏系统模型的正确性和LADRC对耦合问题优秀的解耦能力。3.光伏电源在微网中只输出有功功率的特性使其在微网中大多采用P-Q控制,光伏电源在微网大多运行在最大功率点,但当光伏发出的功率大于负载功率时,这种方法便不再合理。本文研究了利用调节光伏电池运行电压使其输出功率与系统负载功率匹配的方法,通过仿真分析,这种方法有效的降低了储能系统的压力,对于提高整个微网的稳定有一定的指导意义。
[Abstract]:As the lifeblood of national economic development, energy is paid more and more attention by every country in the world.But with the rapid economic development, two major problems have emerged, namely, energy crisis and environmental pollution.Photovoltaic power generation is the most common way of solar energy utilization. It is of great theoretical and practical significance to study its theory and practical application for solving energy crisis, environmental pollution and realizing green sustainable development.The contents of this paper are as follows: 1.This paper introduces several key technologies of photovoltaic power generation system, especially grid-connected photovoltaic and photovoltaic isolated grid operation.How to absorb the advantages of PID is introduced in this paper, which is based on the idea of error elimination, and the basic principle of linear ADRC is introduced. It is a kind of ADRC technology for optimizing parameter adjustment.Finally, the stability of linear active disturbance rejection controller is proved, which lays a theoretical foundation for the following research. 2.In this paper, the mathematical model of grid-connected photovoltaic system is established, and the coordinate transformation of three-phase system is carried out. The coupling relationship between active power current and reactive power current in the current control loop is revealed. The controller is designed by using LADRC to design the coupling problem.Decoupling is carried out, and the bandwidth of the observer is reduced by using the model information of the system.The simulation results show that the output voltage response is fast and has a good sinusoidal degree. The correctness of the grid-connected photovoltaic system model and the excellent decoupling ability of LADRC to the coupling problem are proved. 3.The characteristic that the photovoltaic power only outputs active power in the microgrid makes it adopt P-Q control in the microgrid, and the photovoltaic power is mostly run at the maximum power point in the microgrid, but this method is no longer reasonable when the power emitted by the photovoltaic is larger than the load power.In this paper, the method of adjusting the operating voltage of photovoltaic cells to match the output power with the load power of the system is studied. The simulation results show that this method can effectively reduce the pressure of the energy storage system.It has certain guiding significance for improving the stability of the whole microgrid.
【学位授予单位】：天津理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM615

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