Enhanced Optimal Power Flow Based Droop Control in MMC-MTDC Systems

TL;DR

This paper introduces an enhanced optimal power flow model with an adaptive droop control for MMC-MTDC systems, improving efficiency, stability, and reliability in multi-terminal DC grids.

Contribution

It develops a novel adaptive droop control integrated into an OPF model for MMC-MTDC systems, demonstrating improved operational performance.

Findings

Reduced generation costs

Minimized DC voltage deviations

Enhanced system stability

Abstract

Optimizing operational set points for modular multilevel converters (MMCs) in Multi-Terminal Direct Current (MTDC) transmission systems is crucial for ensuring efficient power distribution and control. This paper presents an enhanced Optimal Power Flow (OPF) model for MMC-MTDC systems, integrating a novel adaptive voltage droop control strategy. The strategy aims to minimize generation costs and DC voltage deviations while ensuring the stable operation of the MTDC grid by dynamically adjusting the system operation points. The modified Nordic 32 test system with an embedded 4-terminal DC grid is modeled in Julia and the proposed control strategy is applied to the power model. The results demonstrate the feasibility and effectiveness of the proposed droop control strategy, affirming its potential value in enhancing the performance and reliability of hybrid AC-DC power systems.