分布式光伏并网中电能质量的监测及改善研究

发布时间：2018-08-04 14:27

【摘要】：目前分布式光伏并网发电在这个领域不仅能够有效提高同等规模的光伏电站发电量,同时也有效解决了电力在升压及长途运输中的损耗问题,资源优势得天独厚,应用前景十分广阔。本文分析了分布式光伏产业发展的趋势、国内对于分布式光伏发电的政策法规,介绍了光伏发电的基本发电原理和运行特性,根据电力系统对光伏系统在线单元的各个指标及其电能质量的要求,通过计算机技术和现代控制技术设计了光伏并网的简单系统,并分析了分布式光伏发电之后并网的远程监测通信方式。在Matlab/Simulink的平台依次分析并搭建模拟了光伏电池组件、光伏并网逆变器等光伏子系统并模拟了光伏并网整体的过程,最后通过与实际光伏电站的标准实测数据进行了对比分析,证明了该模型的稳定有效性。研究了提高电能质量从而降低光伏发电并网对电网影响的方法,在搭建的光伏并网仿真模型系统的基础上单独设计了LCL滤波器,在matlab中进行了模拟滤波,检测了滤波前及滤波后的谐波质量及输出的电流电压波形,最后在LCL滤波之后,检测出的谐波质量满足了国家电力部门的标准,达到了改善电能质量的预期效果。最后结合现场工程情况以及目前的计算机技术和网络通信技术,通过电力系统、自动控制、现代通信技术多个方面分析对比并优化设计了适合分布式光伏发电的在线远程监测方案,实现了电站的监测网络化、智能化,为光伏发电的推广应用创造有利条件。
[Abstract]:At present, distributed photovoltaic grid-connected generation not only can effectively improve the same scale of photovoltaic power generation in this field, but also effectively solve the problem of power loss in the boost up and long-distance transportation. The application prospect is very broad. This paper analyzes the development trend of distributed photovoltaic industry, domestic policies and regulations for distributed photovoltaic power generation, introduces the basic principles and operating characteristics of photovoltaic power generation. According to the requirements of the power system for the on-line unit of the photovoltaic system and its power quality, a simple grid-connected photovoltaic system is designed through computer technology and modern control technology. The communication mode of remote monitoring after distributed photovoltaic power generation is analyzed. In the Matlab/Simulink platform, the photovoltaic modules, photovoltaic grid-connected inverter and other photovoltaic subsystems are analyzed and simulated in turn, and the whole process of grid-connected photovoltaic system is simulated. Finally, the comparison and analysis are made with the standard measured data of the actual photovoltaic power station. The stability and validity of the model are proved. In this paper, the method of improving power quality and reducing the influence of photovoltaic grid connection on power grid is studied. LCL filter is designed separately on the basis of the photovoltaic grid-connected simulation model system, and simulated filter is carried out in matlab. The harmonic quality before and after filtering and the output current and voltage waveforms are detected. Finally, after LCL filtering, the detected harmonic quality meets the national power department standards and achieves the desired effect of improving the power quality. Finally, combined with the field engineering situation and the current computer technology and network communication technology, through the power system, automatic control, This paper analyzes and optimizes the on-line remote monitoring scheme suitable for distributed photovoltaic power generation in many aspects of modern communication technology, realizes the monitoring network and intelligence of power station, and creates favorable conditions for the popularization and application of photovoltaic power generation.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM615

【参考文献】