Interactions between indirect DC-voltage estimation and circulating current controllers of MMC-based HVDC transmission systems

• Main Authors: Wickramasinghe, Harith R., Konstantinou, Georgios, Pou, Josep, Agelidis, Vassilios G.
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2020
• Subjects: Engineering::Electrical and electronic engineering; DC-voltage Estimation; DC-voltage Control
• Online Access: https://hdl.handle.net/10356/141521
• Institution: Nanyang Technological University

Estimation-based indirect dc-voltage control in MMCs interacts with circulating current control methods. This paper proposes an estimation-based indirect dc-voltage control method for MMC-HVDC systems and analyzes its performance compared to alternative estimations. The interactions between estimation-based indirect dc-voltage control and circulating current control methods, active/reactive power regulation are also investigated. The proposed method delivers similar performance to measurement-based direct dc-voltage control, regardless of the circulating current control method. Steady-state and transient performance is demonstrated using a benchmark MMC-HVDC transmission system, implemented in a real-time digital simulator. The results verify the theoretical evaluations and illustrate the operation and performance of the proposed indirect dc-voltage control method.