考虑负荷损失的电网网架结构评价体系研究  

An evaluation system of power grid structure considering load loss

作　　者：王冠 张青蕾 张思远 何楷文 秦博宇 杜正春[2] WANG Guan;ZHANG Qinglei;ZHANG Siyuan;HE Kaiwen;QIN Boyu;DU Zhengchun(State Grid Shaanxi Electric Power Company Limited,Xi’an 710048,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]国网陕西省电力有限公司,陕西西安710048 [2]西安交通大学电气工程学院,陕西西安710049

出　　处：《电工电能新技术》2023年第1期40-47,共8页Advanced Technology of Electrical Engineering and Energy

基　　金：国网陕西省电力公司科技项目(5226SX20004P)。

摘　　要：电力用户为了保护生产设备的用电安全,配置了大量的低压脱扣装置,在电网发生电压暂降时,低压脱扣装置可能发生动作,导致电网大量负荷损失,严重威胁供电可靠性。针对此问题,本文提出了考虑负荷损失的电网网架结构评价体系。首先,根据电网内母线和线路发生的4种短路故障建立各类型电压暂降矩阵;其次,依据低压脱扣装置的整定值,变换电压暂降矩阵的元素,得到能反映电压暂降范围和程度的凹陷域矩阵和反映电压暂降对电网负荷影响程度的负荷矩阵;然后,通过对凹陷域矩阵和负荷矩阵内行列信息的处理得到暂降频次等指标,建立电网网架结构评价体系;最后,结合实际案例验证了所提评价体系能够从供电端和受电端两个角度评价电网的网架结构并准确描述电网中发生短路故障后的电压暂降水平和负荷损失情况,并通过对比网架结构调整前后电网网架结构评价体系指标,能够验证网架结构调整方案的有效性。Power users are equipped with a large number of low voltage releases to protect the production equipment.When the voltage sag is occurring in the power grid,the low voltage releases may act,resulting in large load loss of the power grid and seriously threatening the reliability of power system.To solve this problem,an evaluation system of power grid structure considering load loss is proposed.Firstly,according to the four types of short circuit faults of buses and lines in the power grid,voltage sag matrices are established.Secondly,according to the setting value of low voltage releases,the elements of voltage sag matrices are transformed to obtain the vulnerability area matrices reflecting the range and degree of voltage sag and the load matrices reflecting the influence of voltage sag on power grid load.Then,by processing the row and column information in the vulnerability area matrices and load matrices,the indexes such as sag frequency are obtained,and the evaluation system of power grid structure is established.Finally,a practical case is given to verify that the proposed evaluation system can evaluate the power grid structure from the perspectives of power supply and power receiving,and accurately describes the voltage sag and load loss.The effectiveness of the grid structure adjustment can be verified by comparing the indexes of the evaluation system of power grid structure before and after the adjustment.

关 键 词：电压暂降 低压脱扣装置 负荷损失 电网结构 

分 类 号：TM714.2[电气工程—电力系统及自动化]