摘要
配电网重构是指:通过改变开关状态来调整网络的拓扑结构,优化功率传输,是配电系统维持稳定的重要方法。传统的固定时间断面静态重构方法,无法适应新能源接入配电网后,快速变化的拓扑需求,配电网络节点的功率高时变性也给传统静态重构方法带来困难。为此提出了基于动态时间规整的配电网分时段动态重构方法。通过马氏距离测量电网在动态时间内,拓扑结构中节点的规整时序局部距离,划分负荷波动范围,得到电网拓扑中动态最佳分段个数与分段点。利用线性加权法把电网重构单目标转换成多目标优化,计算配电网分时段动态重构多目标优化方程。利用该方法控制开关状态,实现电网重构。实验证明:这种方法对配电网络重构后,网损值为539.2 kW,最低点电压数为0.994,重构后节点电压与实际值拟合度较好,配电网的频率偏差及谐波含量明显下降,说明所提方法的配电网重构可靠性较好。
Distribution network reconstruction refers to adjusting the topology of the network and optimizing power transmission by changing the switch state,which is an important method for maintaining stability in the distribution system.The traditional fixed time cross-sectional static reconstruction method cannot adapt to the rapidly changing topology requirements after new energy is connected to the distribution network,and the high time-varying power of distribution network nodes also brings difficulties to the traditional static reconstruction method.A distribution network dynamic reconstruction method based on dynamic time warping is proposed for this purpose.By measuring the local distance of the regular time series of nodes in the topology structure of the power grid during dynamic time using Markov distance,the range of load fluctuations is divided,and the optimal number of dynamic segments and segmentation points in the power grid topology are obtained.By using the linear weighting method,the single objective of power grid reconstruction is transformed into multi-objective optimization,and the multi-objective optimization equation for dynamic reconstruction of distribution networks in different time periods is calculated.Use this method to control the switch state and achieve power grid reconstruction.Experimental results show that after the reconstruction of the distribution network,the network loss value of this method is 539.2 kW,and the lowest point voltage is 0.994.The reconstructed node voltage has a good fit with the actual value,and the frequency deviation and harmonic content of the distribution network have significantly decreased.This indicates that the reliability of the proposed method for distribution network reconstruction is good.
作者
毛德拥
周章斌
曹涛
MAO De-yong;ZHOU Zhang-bin;CAO Tao(State Grid Anhui Electric Power Company Hefei Power Supply Company,Hefei 230000)
出处
《环境技术》
2024年第6期36-42,共7页
Environmental Technology
基金
国网安徽省电力有限公司科技项目,项目编号:5212A0220002。
关键词
动态时间规整算法
配电网
分时段动态重构
可靠性分析
负荷曲线
dynamic time warping algorithm
distribution network
dynamic reconstruction in different time periods
reliability analysis
load curve
