Abstract
Contemporary distributions are now going to underground their overhead distribution lines due to techno-social reasons. Reliability and loss reduction are the two prime objectives for distribution system operation. Since failure rates of ungrounded cables are the function of Joules heating besides their physical lengths, the reliability evaluation of undergrounded distribution systems needs to be reviewed. This paper suggested a suitable modification in existing reliability indices in order to make them more appropriate for underground distribution systems. A multi-objective network reconfiguration problem is formulated to enhance the reliability and performance of distribution systems while duly addressing the variability and uncertainty in load demand and power generation from renewables. The application results on a standard test bench shift the paradigm of the well-known conflicting nature of reliability and network performance indices defined for overhead distribution systems.
Highlights
Contemporary distributions are going to underground their overhead distribution lines due to techno-social reasons
This paper addresses a new methodology for the reliability evaluation of underground distribution systems by proposing dynamic failure rates of feeders and suggests network reconfiguration to enhance the reliability and performance of distribution systems
The proposed failure rates depend upon the feeder length as well as distribution flows and become dynamic
Summary
Contemporary distributions are going to underground their overhead distribution lines due to techno-social reasons. The objective of improving the reliability of distribution systems stands for the reduction in the frequency and the duration of power interruptions that affect the customers [3]. Network performance of distribution systems can be enhanced by minimizing feeder power losses and node voltage deviations. This is accomplished by optimally varying the radial topology of the network via exchanging the status of sectionalizing and tie switches, and the process is known as network. Reliability and network performance objectives can be enhanced simultaneously, which otherwise are well-known for their conflicting nature In this context, existing reliability indices need modification and the effectiveness of NR to enhance both the reliability and performance of distribution systems needs investigation
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