Journal
CSEE JOURNAL OF POWER AND ENERGY SYSTEMS
Volume 3, Issue 4, Pages 340-352Publisher
CHINA ELECTRIC POWER RESEARCH INST
DOI: 10.17775/CSEEJPES.2017.00440
Keywords
DC circuit breaker (CB); DC-fault blocking; DC voltage droop control; detailed switching model; embedded HVDC; equivalent circuit model; high-voltage direct current (HVDC); meshed DC grids; modeling of MMC-MTDC; modular multilevel converter (MMC); multi-terminal direct current (MTDC); power oscillation damping
Funding
- SGCC Science and Technology Program under project Research on Electromagnetic Transient Simulation Technology for Large-scale MMC-HVDC Systems
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Multi-terminal direct current (MTDC) grids provide the possibility of meshed interconnections between regional power systems and various renewable energy resources to boost supply reliability and economy. The modular multilevel converter (MMC) has become the basic building block for MTDC and DC grids due to its salient features, i.e., modularity and scalability. Therefore, the MMC-based MTDC systems should be pervasively embedded into the present power system to improve system performance. However, several technical challenges hamper their practical applications and deployment, including modeling, control, and protection of the MMC-MTDC grids. This paper presents a comprehensive investigation and reference in modeling, control, and protection of the MMC-MTDC grids. A general overview of state-of-the-art modeling techniques of the MMC along with their performance in simulation analysis for MTDC applications is provided. A review of control strategies of the MMC-MTDC grids which provide AC system support is presented. State-of-the art protection techniques of the MMC-MTDC systems are also investigated. Finally, the associated research challenges and trends are highlighted.
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