Active Distribution Networks Equivalencing for Dynamic Studies Using Measurements

Abstract

In order to analyze power system dynamics in presence of microgrids and active distribution networks, it is essential to use accurate models of them in software packages. Since microgrids and active distribution networks include different types of distributed generations with complex detailed models, this will lead to high computation burden for this kind of studies. Therefore, it has been proposed to use precise equivalent models instead of detailed models. In this paper, a new method is proposed to obtain the dynamic equivalent model of active distribution networks using measurement data of disturbances. These disturbances include three phase short circuit which may occurred in the upstream power system. The proposed method uses measurement data of point of common coupling to simultaneously estimate the parameters of the equivalent generation unit and its controller. To show the effectiveness of the proposed method, it is applied to IEEE 9-Bus and 33-Bus systems as upstream and distribution systems, respectively.