Smart transformer Modelling in Optimal Power Flow Analysis

TL;DR

This paper introduces a model for smart transformers in optimal power flow analysis, demonstrating how their flexible voltage and reactive power control can optimize system costs in power grids.

Contribution

The paper develops a novel smart transformer model tailored for OPF analysis and evaluates its impact on generation costs with multiple transformers in a test system.

Findings

Multiple smart transformers reduce daily generation costs.

Smart transformers improve voltage regulation and reactive power management.

Cost savings increase with higher transformer penetration.

Abstract

The smart transformer (ST) implemented using power electronics converters, has the capability of independent voltage control and reactive power isolation between its primary and secondary terminals. This capability provides a flexibility in the power system to support the voltage at the primary side and control the demand at the secondary side. Using this flexibility, the system power flow could, for example, be optimized for lower costs. This paper proposes an ST model suitable for OPF analysis. The effects of using multiple STs at different penetration levels, on the daily generation costs in an IEEE 39 bus test system are presented.