A Novel Method for Calculating Demand Not Served for Transmission Expansion Planning

TL;DR

This paper introduces a load flow based method for accurately calculating demand not served in transmission expansion planning, addressing limitations of previous graph theory approaches by incorporating electrical laws and losses.

Contribution

It presents a generalized load flow methodology that calculates DNS, GNS, and WL simultaneously, including I2R losses, improving accuracy over existing MCMF-based methods.

Findings

The proposed method effectively calculates DNS, GNS, and WL.

It incorporates I2R losses, enhancing accuracy.

Case study demonstrates superiority over existing approaches.

Abstract

Restructuring of the power market introduced demand uncertainty in transmission expansion planning (TEP), which in turn also requires an accurate estimation of demand not served (DNS). Unfortunately, the graph theory based minimum-cut maximum-flow (MCMF) approach does not ensure that electrical laws are followed. Nor can it be used for calculating DNS at individual buses. In this letter, we propose a generalized load flow based methodology for calculating DNS. This procedure is able to calculate simultaneously generation not served (GNS) and wheeling loss (WL). Importantly, the procedure is able to incorporate the effect of I2R losses, excluded in MCMF approach. Case study on a 5-bus IEEE system shows the effectiveness of the proposed approach over existing method.