摘要：当今世界在飞速发展的同时,也面临能源短缺以及环境污染等问题，为了缓解这些问题，原始的火力发电占全球总发电比重逐渐下降，各个国家和地区开始关注绿色清洁能源的蕴藏着的巨大发电价值，并且逐渐投入应用。随着越来越多种类和形式的分布式电源投入到了传统电网，对整个电网产生了很大很深远的影响。从生态环境的角度来考虑，分布式电源的投入使用也有其必要性。

首先，分析几种主要的新能源，建立数学模型，提出了它们在潮流计算中的处理方法。由于分布式、分散式规模较小的电源的接入，电网中节点的种类也随DG种类的增多而增加，PV节点、PI节点也有可能存在。由于节点类型的不同会导致网络拓扑结构发生改变，因此潮流的分布情况也会随之发生变化。

然后，分析几种常见的潮流计算方法，并且把过程思路以流程图的形式直观的展现出来。而且通过查阅文献可以知道潮流计算在整个电网的研究中显得尤为重要。传统电网一般只有一个独立电源，电网中的节点类型只有两种，所有负荷都可以当作PQ节点。分析了几种方法之后，论文决定采用前推回代法。前推回代法一般处理PQ节点比较快速，但是当线路中节点类型发生改变时，并不能处理这种情况。因此，在研究过程的一开始，以传统的前推回代法为基石，接着分析适用于含有不同类型的分布式电源的配电网潮流算法，并设计相应程序是本文的目标。

最后，以IEEE33配电网设计前推回代法的程序，并通过参考文献[3]给出的数据验证传统前推回代法程序的正确性。然后根据分布式电源类型的不同编写相应的改进前推回代法的程序，在IEEE33配电网节点算例中仿真验证。总结展望，改进前推回代法计算含分布式分散式电源的配电网的潮流问题收敛速度快，效率高，同时总结了本次设计的不足之处。

关键词 分布式电源配电网潮流前推回代法

毕业设计说明书外文摘要

Title：Research on Power Flow Algorithm and Program Design of Active：Distribution Network

Abstract：Today's world is facing energy shortages and environmental pollution and other issues,The original thermal power generation accounted for the proportion of the total global power generation is gradually decreased. With the distributed power into the grid, not only energy and environmental problems can be alleviated, but also it can make up for the power grid paralysis caused by large-scale power failure defects and improve the stability of power supply grid.

First of all, the analysis of several major new energy sources, the establishment of mathematical models, put forward their power flow in the calculation method. Due to the distributed and decentralized power supply.The traditional power grid generally has only one  independent power supply, there are only two types of nodes in the grid, all the load can be used as PQ node. After analyzing several methods, the paper decided to use the pre-push back method.

Then, several common methods of calculating the power flow are analyzed, and the process ideas are presented in the form of flowcharts. And by referring to the literature we can see that the power flow calculation is particularly important in the whole grid research. Therefore, the traditional forward-push back method is used as the cornerstone.

Finally, the procedure of the pre-push-back method is designed with the IEEE33 distribution network, and the correctness of the traditional preprocessing method is verified by the data given in [3]. And then according to the different types of distributed power supply to prepare the corresponding pre-push back to the law of the program, in the IEEE33 distribution network node example simulation verification.The convergence speed is fast and the efficiency is high, and the shortcomings of this design are summarized.