10kV线路首端负荷安全域边界的估算方法
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作者单位:

1.长沙理工大学 电气与信息工程学院;2.国网湖南省电力公司株洲供电公司

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TM712

基金项目:

国家自然科学基金(52077009);湖南省教育厅重点项目(20A013);湖南省株洲市供电公司科技项目(SGHNZZ00YYJS1901552)


Estimation method of security region boundary of 10 kV line head end load
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1.School of Electrical and Information Engineering,Changsha University of Science & Technology;2.State Grid Hunan Electric Power Company Zhuzhou Power Supply Company

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    摘要:

    10kV线路的主线具有单端注入的母线功能,其末端容易出现低电压问题。将主线压降约束转变为出线负荷约束,可为安全运行与规划提供极大便利,故本文研究首端负荷安全域边界的估算方法。针对沿线众多的台区负荷,基于分段压降特征,提出了主线压降快速估算的力矩法;将实际台区负荷分布,等效为沿线均衡分布附加若干重载点的特征形式,更加符合实际情况;基于力矩法得到线路首端负荷与压降的关系,进而得到首端负荷安全域边界的线性化方程。算例结果表明,力矩法的压降分析和安全域边界分析都能满足工程精度要求。基于首端负荷安全域边界可得到10kV线路的承载裕度,便于负荷控制和配网滚动规划,具有较好的工程应用价值。

    Abstract:

    The main line of the 10kV line has a single-ended injection bus function, and the end is prone to low voltage problems. The main line pressure drop constraint can be transformed into the outgoing load constraint, which can provide great convenience for safe operation and planning. Therefore, this paper studies the estimation method of the first-end load security region boundary. Aiming at the numerous station loads along the line, based on the segmented pressure drop characteristics, a torque method for rapid estimation of the pressure drop across the main line is proposed; the actual station load distribution is equivalent to the characteristic form of balanced distribution along the line with several heavy load points, which is more consistent The actual situation: Based on the moment method, the relationship between the load at the head end of the line and the pressure drop is obtained, and then the linearized equation of the safety zone boundary of the head load is obtained. The results of the calculation examples show that the pressure drop analysis and safety zone boundary analysis of the moment method can meet the engineering accuracy requirements. Based on the boundary of the first-end load safety zone, the load margin of the 10kV line can be obtained, which is convenient for load control and rolling distribution network planning, and has good engineering application value.

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  • 收稿日期:2021-03-11
  • 最后修改日期:2021-04-30
  • 录用日期:2021-05-19
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