基于源荷节点对供电效率的分布式电站并网选址研究

Study on Grid Access of Distributed Power Stations Based on Power Supply Efficiency of Source-load Node Pair

结合网络的拓扑和电气特性研究了加权网络上分布式电站最佳入网选址问题。首先,采用二阶类Kuramoto相振子模型进行电网建模,采用等耦合强度下的网络潮流值对电网线路进行加权,构建电网加权网络模型;通过计算每个负荷节点到各发电机节点的传输效率和每个负荷节点从各发电机节点吸收功率大小,定义源荷节点对供电效率指标。然后根据每个负荷节点的源荷节点对供电效率值大小定义三种入网方式,研究在耦合加权网络上分布式电站以三种不同入网方式并网对电网同步性能的影响。研究表明:在耦合加权网络上,分布式电站按供电效率值从小到大排列的接入方式为最优,其次是随机选择负荷节点的方式,供电效率值从大到小排列的方式最差。因此,分布式电站以源荷节点对供电效率指标较小的负荷节点开始接入电网,电网的同步性能最好。

The optimal site selection of distributed power stations on a weighted network is studied by combining the topology and electrical characteristics of the network.Firstly,the second-order Kuramoto-like phase oscillator model is used to model the power grid,and the network power flow value under equal coupling strength is used to weight the power grid lines to construct a weighted network model of the power grid;by calculating the transmission efficiency from each load node to each generator node and the power absorbed by each load node from each generator node,which defines the power supply efficiency index of source-load node pair.Then,according to the power supply efficiency value of the source-load nodes of each load node,three grid access methods are defined.The influence of three different grid access methods of distributed power stations on the synchronizability of the grid is studied on the coupling weighted network.Study shows that the access mode of distributed power stations is the best in order to arrange the power supply efficiency value from small to large,followed by the way of randomly selects load nodes,and the way in which the power supply efficiency value is arranged in descending order is the worst.Therefore,the power grid can achieve better synchronizability when the distributed power stations connect to the power grid on the load node with the lower power supply efficiency index of the source-load node pair.