The sizing and siting of Distributed Generation for mitigating voltage sags

Voltage sags have a major concern in the distribution systems. With the large number of distributed generations connected to the distribution networks, the complexity of distribution networks increases gradually. Thus, how to ensure the minimum damage caused by voltage sags has been the focus of research. In order to effectively mitigate voltage sags and satisfy the grid-connection control requirements of distributed generations, the sizing and siting optimization model of distributed generations is proposed in this paper. The investment and operation cost of distributed generations and mitigating voltage sags on sensitive load are comprehensively considered in this model. To reasonably evaluate economic losses of sensitive load caused by voltage sags in a grid, a novel voltage sags frequency indicator is proposed and the line faults are considered in this indicator. The proposed method is validated by IEEE 33 system and its correctness and reliability are also proved.