Work

Dynamic phasor state-space solver for hybrid AC/DC systems

Year: 2026

Type: article

Abstract: This paper presents a dynamic phasor-based state-space modelling framework for modular multilevel converters (MMCs) using multiple dq reference frames ( DQsym ). The main contribution is the development of a numerically stable state-space solver tailored to multi- dq dynamic phasor models. The solver employs integration and a systematic matrix update mechanism to consistently incorporate switching events within the unified state-space formulation, allowing harmonic interactions and topology changes to be captured without manual reconfiguration. The proposed framework is implemented as a standalone MATLAB/Simulink library to facilitate time-domain simulation and to provide a structured basis for future eigenvalue-based small-signal stability studies. The approach is validated on a point-to-point HVDC system and benchmarked against an EMT model. Results demonstrate that the DQsym -based implementation achieves EMT-level fidelity while maintaining state-space structure suitable for scalable, system-level analysis of converter-dominated grids.

Source: Electric Power Systems Research

DOI: 10.1016/j.epsr.2026.113547

Authors: Saif Alsarayreh, Robert Dimitrovski, Aleksandra Lekić

Institution: Delft University of Technology

Language: English

Topic: HVDC Systems and Fault Protection

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: hybrid

Estimated APC paid: $2,810