# Optimal Investment on Series FACTS Devices Considering Contingencies

## TL;DR

This paper presents a planning model for optimally allocating TCSC devices in power systems, considering contingencies and load variations, using linearization techniques and IEEE case studies.

## Contribution

It introduces a novel linearized optimization model for TCSC placement that accounts for contingencies and load patterns in power system planning.

## Key findings

- The model effectively reduces congestion and costs.
- Numerical results show high performance on IEEE 118-bus system.
- Contingency considerations improve planning robustness.

## Abstract

Series FACTS devices are capable of relieving congestion and reducing generation costs in the power system. This paper proposes a planning model to optimally allocate TCSCs in the transmission network considering the base case and $N-1$ contingencies. We consider a single target year and select three distinct load patterns to accommodate the yearly load profile. A reformulation technique is utilized to linearize the nonlinear power flow constraint introduced by a TCSC. Numerical case studies based on the IEEE 118-bus system demonstrate the high performance of the proposed planning model.