Abstract
The modular multilevel converter (MMC) has been widely adopted in high voltage direct current (HVDC) transmission systems due to its significant advantages. MMC-HVDC is developing towards multi-terminal direct current (MTDC) power grid for reliability enhancement. However, there exist a huge amplitude and a steep rise in fault current due to the low impedances of DC lines and MMCs, which threaten the security and reliability of the DC power grids. It is necessary to restrain the DC short circuit current in order to ensure the safe and stable operation of DC power grids. This paper gives a comprehensive review and evaluation of the proposed DC short-circuit current analysis and suppression techniques used in MMC-based MTDC power girds, in terms of MMC modeling, short circuit calculation, and suppression method. In addition, future trends of countermeasures to short circuit current in MMC-based MTDC power grids are also discussed.
Highlights
With the development of global power interconnection, the requirements of long-distance power transmission and asynchronous power grids’ interconnection are increasing
The main contributions of this paper are: first, this paper offers an up-to-date review of the state of modular multilevel converter (MMC)-high-voltage direct current (HVDC) modelling; second, the existing
This paper is organized, as follows: Section 2 makes a brief introduction of MMC-HVDC; Section 3 presents the classification of MMC-HVDC modeling methods; Section 4 introduces several short circuit current calculation methods, and classifies the existing short-circuit current suppression methods for MMC-based multi-terminal direct current (MTDC) power grids; and, Section 5 concludes this paper and discusses future research trends that are based on this work
Summary
With the development of global power interconnection, the requirements of long-distance power transmission and asynchronous power grids’ interconnection are increasing. Short-circuit current calculation methods, and suppression methods are essential in the investigation of countermeasures to the DC short-circuit current in MMC-based MTDC power grids. This paper gives a comprehensive review and evaluation of short-circuit current analysis and countermeasures in MMC-based MTDC power grids. MMC-based MTDC power grid short-circuit current calculation method is introduced; and third, this paper classifies the existing short-circuit current suppression methods, especially the latest achievements in this area. This paper is organized, as follows: Section 2 makes a brief introduction of MMC-HVDC; Section 3 presents the classification of MMC-HVDC modeling methods; Section 4 introduces several short circuit current calculation methods, and classifies the existing short-circuit current suppression methods for MMC-based MTDC power grids; and, Section 5 concludes this paper and discusses future research trends that are based on this work
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