【作者】 黄瑛；

【导师】 陈星莺；

【作者基本信息】 河海大学 ， 电力系统及其自动化， 2005， 硕士

【摘要】 电能损耗是电力工业中的一个重要的技术经济指标,随着500kV电网逐渐成为我国的主力电网,有必要研究500kV电网的运行特点,对电能损耗的计算方法进行改进与创新。本文针对上述问题,作了以下研究工作:第一部分介绍了500kV电力网电能损耗计算的基础理论及其特殊性。500kV电网电能损耗计算以基于潮流的电量法为基础,计算中应当计及长线路的分布参数特性、导线的电晕损耗和网络谐波损耗。第二部分研究了500kV电网中计及导线电晕的电能损耗计算方法。本文利用BP型ANN很强的自适应能力,通过样本数据的学习建立导线电晕损耗计算模型,拟合特征参数与导线电晕损耗之间的关系。此外,本文修改了普通的潮流模型,提出了计及导线电晕的500kV电网电能损耗计算方法。第三部分研究了500kV电网中计及谐波的电能损耗计算方法。本文利用谐波与基波解耦的潮流算法,提出了计及谐波的500kV电网电能损耗计算方法。第四部分研究了同时考虑导线电晕损耗及电网谐波影响的500kV电网电能损耗计算方法。算例表明,在雨天等坏天气下,不计导线电晕对电能损耗造成的计算误差较大,而谐波对500kg电网电能损耗的影响相对较小。更多还原

【Abstract】 Energy losses are an important technical and economical index in power systems, with the 500kV systems becoming the main grids in our country, it is necessary to study the operating features of the 500kV grids and improve the calculation of energy losses. Some research works in this respect are studied in this paper as follows:In part one, the base and the peculiarity of calculating energy losses in 500kV network are introduced. In 500kV network, the calculating of energy losses is based on electricity quantities flow, and three aspects ought to be considered, including distribution feature of long line; corona losses of lines; harmonic energy losses.In part two, the method of computing energy losses in 500kV grids considering the corona losses of lines are studied. First, the design of BP network for calculation corona losses of transmission line in 500KV network is introduced. Then a calculation method of energy losses in consideration of corona losses was presented.In part three a decoupled algorithm for power system harmonic flows was introduced; and a computation mode is established for calculating energy losses, including harmonic energy losses.In part four, based on the above researches, a calculation method was proposed with consideration of the losses caused by corona and harmonic in 500KV network. The computed results shows that under bad weather condition (such as rainy days), if neglecting corona losses the errors are greater, while the effectiveness from harmonic is relatively small in 500KV network.更多还原