安多100kWp独立运行光伏发电系统暂态稳定性分析

【作者】 杨毅男；

【导师】 孔力；

【作者基本信息】 中国科学院研究生院（电工研究所） ， 电力电子与电力传动， 2003， 硕士

【摘要】 本文从独立运行的光伏发电系统在运行中存在的问题出发，分析该类系统的结构和运行方式的特点，判断系统中存在问题的性质。以建成运行的西藏安多地区的100kWp独立光伏电站为具体研究对象，结合研究电力系统的方法，判断光伏系统中存在的因带负荷投入运行而产生的电压不稳定的问题，为电力系统暂态稳定性问题。并且进一步分析得出，产生这种问题的主要原因是系统内的无功功率的不平衡。通过对问题的性质的分析，并结合光伏发电系统的自身特点，选择采用时域数值仿真计算的方法分析独立运行的光伏发电系统的暂态稳定性问题。并选择Matlab的Simulink电力系统软件包作为仿真计算的平台，实现仿真计算。结合电力系统分析中的瞬时无功功率的概念，分析无功功率的流动对系统带来的影响。在理论分析基础上，搭建了简单的以逆变器为核心的实验系统，验证采用这种分析方法对独立运行光伏发电系统存在问题的分析的正确性。针对系统的稳定性问题，论文最后提出添加适当的无功功率补偿设备，是解决建成系统中这一问题的现实可行的方法。而在未来该类系统的设计过程中，在分析系统的无功负荷基础上，合理的分布负荷，并在计算后适当添加一定的无功补偿设备，是提高独立运行光伏发电系统稳定性、改善系统运行性能的有效手段。更多还原

【Abstract】 Because of the problems in the working stand-alone photovoltaic power systems, this paper analyzed the characters of the structure and working mode of this kind of power system and judged which kinds of these problems belong to. Choosing the 100kWp stand-alone photovoltaic power system which was built at Sitsang Anduo county as the research object, and using the methods which are used in analyzing the normal power system, we determined that the problems which happened when the load was launched into the system could be classified as the transient stability problem of power system. After more research, we found the main reason of this problem is the unbalance of reactive power in this kind of power system.Analyzing the problem and the characters of the stand-alone photovoltaic power system, we can chose the numerical simulation method in time-domain to analyze the transient stability of the photovoltaic power system. And we chose the power system tool-box of the Matlab Simulink as our simulation tools to realize the numerical simulation calculation of the stand-alone photovoltaic power system. Here we use the concept of instantaneous reactive power when we simulate the system, we can use them to analyze how they affect the power systems stability.To validate the analysis, referring the real photovoltaic power system, we made a simple experiment system which included an inverter. From the results of simulation and experiments, we can conclude that the unbalance of reactive power is the main reason which make the stand-alone photovoltaic power system suffer transient stability problem which behaved as the voltage waving. So adding some kind of reactive power compensation equipments is a good solution to the working systems. And in the future design of the stand-alone photovoltaic power system, on the based of analyzing the reactive power, we can deal with this problem by reasonably arranging the load and in some situation adding some kind of reactive power compensation equipments. In this way, we can arise the stability of this kind of power system and make them work better.更多还原