Journal
IEEE TRANSACTIONS ON POWER SYSTEMS
Volume 37, Issue 5, Pages 3913-3922Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPWRS.2021.3140061
Keywords
Circuit faults; Short-circuit currents; Limiting; Voltage; Power control; HVDC transmission; Frequency measurement; MMC-based MTDC transmission system; MMC's input-output characteristics; initial-stage DC short-circuit current; system inherent characteristics
Categories
Funding
- National Natural Science Foundation of China [52177112]
- National Key R&D Program of China [2018YFB0904600]
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This paper studies the impact of inherent characteristics on the initial short-circuit current of MMC-based MTDC transmission systems and proposes a calculation method and quantitative indices to measure this impact. Through verification, it is found that the proposed method and indices can effectively evaluate the short-circuit current of the system and provide guidance for the planning, operation, and parameter selection of DC systems.
This paper studies the impact of the inherent characteristics on the initial-stage short-circuit current of modular multilevel converter based multi-terminal direct current (MMC-based MTDC) transmission system. A short-circuit current calculation method based on input-output characteristics is proposed. The MMC's input-output characteristics are factorized into a series combination of a linear and a nonlinear part through the operator approach. The inherent characteristics of the system represent the inherent properties of the MMC-based MTDC system, which are unrelated to the short-circuit fault. Therefore, short-circuit currents are decoupled and quantitative indices are proposed to measure the impact of the system inherent characteristics on the initial-stage short-circuit current. The proposed decoupled short-circuit current calculation method and the quantitative indices are verified in a typical MMC-based MTDC transmission system under different system parameters and structures. The proposed quantitative indices can effectively evaluate the short-circuit current of the MMC-based MTDC system without calculating the short-circuit current, which indicates that they can provide guidance for the planning of DC system structure, determination of operational modes, and selection of system parameters from the perspective of short-circuit current.
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