Abstract
A modular multilevel converter based high-voltage DC (MMC-HVDC) system has been the most promising topology for HVDC. A reclosing scheme is usually configured because temporary faults often occur on transmission lines especially when overhead lines are used, which often brings about an overcurrent problem. In this paper, a new fault current limiter (FCL) based on reclosing current limiting resistance (RCLR) is proposed to solve the overcurrent problem during the reclosing process. Firstly, a mesh current method (MCM) based short-circuit current calculation method is newly proposed to solve the fault current calculation of a loop MMC-HVDC grid. Then the method to calculate the RCLR is proposed based on the arm current to limit the arm currents to a specified value during the reclosing process. Finally, a three-terminal loop MMC-HVDC test grid is constructed in the widely used electromagnetic transient simulation software PSCAD/EMTDC and the simulations prove the effectiveness of the proposed strategy.
Highlights
The modular multilevel converter (MMC), a new type of voltage source converter (VSC), has many advantages over the traditional two or three level topology, such as better harmonic performance, low switching frequency, etc
This paper focuses on the suppression of overcurrent for overhead lines based MMC-HVDC grid
A novel fault current limiter (FCL), which consists of a current limiting inductor (CLI), a reclosing calculation is introduced to a loop MMC-HVDC grid
Summary
The modular multilevel converter (MMC), a new type of voltage source converter (VSC), has many advantages over the traditional two or three level topology, such as better harmonic performance, low switching frequency, etc. This paper focuses on the suppression of overcurrent for overhead lines based MMC-HVDC during the reclosing process. Mesh current method (MCM) based short-circuit current calculation grid during the reclosing process. A novel FCL, which consists of a CLI, a reclosing calculation is introduced to a loop MMC-HVDC grid. A novel FCL, which consists of a CLI, a current limiting resistance (RCLR) and a bypass switch, is proposed. Compared with traditional FCL, reclosing current limiting resistance (RCLR) and a bypass switch, is proposed. Compared with the proposed circuit can limit the maximum arm currents to a specified value during the reclosing traditional FCL, the proposed circuit can limit the maximum arm currents to a specified value process, and the calculation method of RCLR is given in details. During the reclosing process, and the calculation method of RCLR is given in details
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