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摘要光伏发电系统接入配电网后，配电网供电方式将由单电源辐射网转变为存在中小型电源的分布式有源网络，并引起配电网电压分布发生变化。本论文研究了能适用于配电网电压分布计算的光伏发电系统模型，采用计及光伏发电的配电网潮流计算，得到了配电网电压分布规律及其影响因素。主要工作如下：
- 上一篇：塑料光纤+平凹镜太阳自然光照明系统设计
- 下一篇：MATLAB/SIMULINK微电网继电保护技术研究
首先，基于最小二乘曲线拟合建立了能够反映天气变化的光伏发电系统模型，建立了光伏发电系统仿真平台，对模型进行仿真分析，验证了模型可行性。
其次，结合光伏并网发电的特点，提出了改进前推回代算法，改进算法增加了有功及无功修正环节，解决了传统前推回代法不能计算PV节点的问题。
最后，针对光伏电源出力、并网节点类型及接入位置三种情况分析了配电网电压分布的规律，结果表明光伏并网节点为PV类型光伏发电对配电网电压支撑作用大于PQ类型光伏发电；同时指出了光伏电源的接入的容量范围及合适的接入地点。9741
关键字：光伏并网；配电网；改进潮流计算；电压分布
毕业设计说明书（论文）外文摘要
Title The influence and improvement of the Distributed
photovoltaic power to the voltage of the distribution network
Abstract
When the Photovoltaic power generation system is accessed to distribution networks, the distribution system is changed from the single resource radiation network distribution into middle and small distributed active network, and the voltage distribution of the distribution networks would be changed. The photovoltaic power generation systems for voltage calculation in distribution networks is studied in this paper, the power flow calculation in photovoltaic power system is adopted, and the distribution law of voltage distribution and its influencing factors are obtained. The major completed work is as follows:
Firstly, the photovoltaic power generation system model of reflecting the weather’s change was established based on the curve fitting method. Then this paper built the photovoltaic power generation system simulation platform, and made simulation and analysis of the model, proving the feasibility of the photovoltaic power generation system model.
Secondly,combining the characteristics of photovoltaic power generation, an improved forward and backward substitution algorithm is proposed, the modified algorithm adds active and reactive power links, and solves the problem of traditional forward and backward substitution method can not be calculated PV nodes.
Finally, the law of distribution network voltage distribution is analysis according to the output of photovoltaic power, the type of nodes and the location position of the photovoltaic power. The results show that grid-connected solar PV type node of the photovoltaic power effects voltage supporting much more than PQ types of the photovoltaic power generation, and also pointed out the range of accessing capacity of photovoltaic power and the its appropriate accessing position.
Keywords:Photovoltaic grid-connected;Distribution system; Improved flow calculation;Voltage profile
目 录
1 绪论 1
1.1 研究背景和意义 1
1.2 光伏发电系统模型研究现状 2
1.3 本文的主要研究工作 6
2 计及光伏发电的配电网潮流计算 7
2.1 配电网及负荷 7
2.2 含光伏发电的配电网潮流计算 8
2.3 本章小结 12
3 光伏发电系统模型 13
3.1 光伏并网发电系统的组成及特点 13
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