面向山区农村电网电压质量提升的低压交直流改造示范工程及成效分析

Low-Voltage AC/DC Transformation Demonstration Project for Improving Voltage Quality of Rural Power Grid in Mountainous Areas and Its Eeffectiveness Analysis

山区农村的产业和生活用电需求正在快速增长,受到季节性负荷和人口迁移的影响,特别是在某些特定时间段,低电压问题变得尤为突出,传统的交流台区改造方式在投入与效益之间难以取得平衡。为了解决这一问题,本文考虑采用交直流串联和并联两种电网改造方式,以改善远距离供电台区的低电压问题。首先,详细介绍了台区改造前的基本情况,并梳理了传统改造方案存在的问题。然后,从示范涉及的建设方案、变流设备以及设备现场安装情况三个方面,对两种交直流示范工程方案进行了详细阐述。此外,该文还分析了实验室测试数据以及现场应用情况,以验证两种交直流示范工程方案的有效性。最后,文章对示范区改造的效果和未来发展方向进行了总结。

With the rapid growth of industrial and residential electricity consumption in rural and mountainous areas,under-voltage issues are becoming significant and particularly prominent in some periods due to seasonal load and population migration.It is extremely difficult to achieve a balance between input and benefit when considering adopting traditional transformation measures to solve the above problems.Therefore,two types of grid transformation measures,AC-DC series/parallel connection,are proposed to solve under-voltage issues owing to excessive power supply distance.Firstly,this paper introduces basic situations of two low-voltage distribution networks(LVDNs)before the two-type transformations,and analyzes the problems of the traditional transformation measures.Secondly,the two-type transformations of AC-DC series/parallel connection are introduced in detail from three aspects:construction scheme,converter equipment and equipment installation.Moreover,the effectiveness of the AC-DC series/parallel connection schemes is verified by analyzing the laboratory test data and applications,and the advantages and disadvantages of the two types of transformations are analyzed.Finally,the effects of the the two types of transformations and the future development direction are summarized.