Power Flow Control using multiple Phase-Shifting Transformers

When multiple phase-shifting transformers (PSTs) are installed in a meshed electrical grid, careful coordination of these devices is crucial. Poor coordination can result in inefficient infrastructure use and may even compromise the security of supply. This paper aims to explore how PSTs can be controlled to achieve an optimal or near-optimal configuration for a given network. The Croatian transmission network is used as a case study. Expert knowledge is applied alongside an iterative algorithm based on power flow sensitivity analysis. The objective is to determine the PST phase angles and voltage ratios to prevent transmission network overloads under both normal and N-1 contingency conditions during the planning phase.