基于分区分压的配电网供电能力计算实用方法  

A Practical Method for Calculating Power Supply Capacity of Distribution Network Based on Power Supply Subareas and Sub-networks of Different Voltages

作　　者：孙东雪 王主丁[1,2] 田园 GUI ZIAO[4] SUN Dongxue;WANG Zhuding;TIAN Yuan;GUI ZIAO(State Key Laboratory of Power Transmission Equipment&System Security and New Technology(Chongqing University),Shapingba District,Chongqing400044,China;Chongqing Star Electrical Company,Jiulongpo District,Chongqing 400039,China;Yunnan State Grid Information Center,Kunming 650217,Yunnan Province,China;Northern Arizona University,Flagstaff86001,State of Arizona,USA)

机构地区：[1]输配电装备系统安全与新技术国家重点实验室(重庆大学),重庆市沙坪坝区400044 [2]重庆星能电气有限公司,重庆市九龙坡区400039 [3]云南电网公司信息中心,云南省昆明市650217 [4]北亚利桑那大学,美国亚利桑那州弗拉格斯塔夫市86001

出　　处：《电网技术》2020年第8期3081-3089,共9页Power System Technology

摘　　要：从实际规划应用的目的出发,基于采用简单方法解决大规模复杂问题的思路,给出了2种供电能力的明确定义,提出了一种基于分区分压的配电网整体供电能力计算模型和方法。基于电气上相对独立划分的供电分区,相同电压等级配电网的供电能力采用其分区供电能力直接累加求得;基于不同电压等级配电网间供电能力的相互制约,多电压等级配电网整体供电能力取相关电压等级配电网供电能力中的最小值获得。其中,推导了将线路允许电压损耗转化为相应容量约束的近似估算公式,较为简捷地考虑了电压质量对供电能力计算的影响;推导了高压和中压分区供电能力的近似估算公式,便于人工计算或干预;针对通过中压线路相互联络的高中压供电分区,根据馈线现状负荷及其变化趋势预测计算相应的供电能力,使结果更符合实际。基于上述分区分压的计算过程可以直观方便地识别配电网的薄弱环节,并据此制定提升供电能力的措施或方案。算例结果表明,与现有供电能力计算方法相比,该模型和方法直观、简捷、稳定和有效,便于在实际工程中推广运用。Starting from the application purpose of real distribution network planning and the idea of solving large-scale and complex problems using simple methods, two kinds of definitions for power supply capacity of a distribution network is given in this paper, and a practical method is proposed for calculating the power supply capacity of a distribution network based on power supply subareas and sub-networks with different voltages. Based on relatively independent power supply subareas, the power supply capacity of the distribution network with the same voltage is obtained by direct accumulation of its subareas’ power supply capacities. Based on the mutual restriction of power supply capacities among the related sub-networks with different voltages, the overall power supply capacity of a multi-voltage distribution network is obtained by taking the minimum values of the power supply capacities of related sub-networks. An approximate estimation formula is deduced, converting line allowable voltage loss into corresponding capacity constraints with the influence of voltage quality on power supply capacity concisely considered. The approximate formulas for estimating the power supply capacities of HV and MV subareas(or typical wiring modes) are deduced for manual calculation or intervention. For the HV and MV power supply subareas connected with MV lines, the power supply capacity of a HV substation is predicted according to current feeder loads and their change trends, so that the results are more realistic. Based on above calculation process of power supply subareas and sub-networks with different voltages, the weakness of a distribution network can be identified intuitively and conveniently, which can be used as the basis for formulating measures or schemes to improve power supply capacities. Numerical examples show that the proposed model and method are intuitive, simple, stable and effective compared with existing methods calculating power supply capacities, and convenient for popularization and application in pract

关 键 词：多电压等级配电网 供电分区 典型接线模式 负荷分布约束 电压约束 

分 类 号：TM721[电气工程—电力系统及自动化]