Evaluation of dc-links on dense-load urban distribution networks.

摘要

This thesis presents for the first time, an investigation of utilizing dc-links to merge heavily-meshed urban distribution networks in dense load areas to increase reliability and expand operational flexibility. It provides a cost-benefit evaluation of utilizing dc-link technology to interconnect three segments of New York City (NYC) electric distribution networks with complex grid configurations and utilizes a unique means of connecting the dc-link at the low voltage level to optimize voltage support. The outcome of this work highlights the advantages provided by dc-links such as increased reliability and power quality, improved voltage support, and demand relief for feeders at or above capacity limitations. Furthermore, the study shows that dc-links may provide a better alternative to transformer installations, feeder upgrades and/or capacitor additions, and offers the opportunity to postpone large capital investments for system upgrades (such as building a new substation) due to demand increase. The research was carried out with power flow simulations using field validated power flow data.