Short-circuit current calculation method for partial coupling transmission lines under different voltage levels

2016 ◽  
Vol 78 ◽  
pp. 647-654 ◽  
Author(s):  
Chunju Fan ◽  
Kan Xu ◽  
Qi Liu
Keyword(s):  
Transmission Lines ◽  
Calculation Method ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Current Calculation ◽  
Partial Coupling

scholarly journals A Novel Overcurrent Suppression Strategy during Reclosing Process of MMC-HVDC

2019 ◽  
Vol 9 (9) ◽  
pp. 1737 ◽  
Author(s):  
Bin Jiang ◽  
Yanfeng Gong
Keyword(s):  
Transmission Lines ◽  
Short Circuit ◽  
Current Method ◽  
Short Circuit Current ◽  
Simulation Software ◽  
Fault Current ◽  
Overhead Lines ◽  
Hvdc System ◽  
Electromagnetic Transient Simulation ◽  
Current Calculation

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.

scholarly journals Research on Short-Circuit Current Calculation Method of Doubly-Fed Wind Turbines Considering Rotor Dynamic Process

2021 ◽  
Vol 9 ◽  
Author(s):  
Jun Yin
Keyword(s):  
Power Systems ◽  
Dynamic Process ◽  
Calculation Method ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Induction Generators ◽  
Doubly Fed ◽  
Current Calculation ◽  
Rotor Dynamic ◽  
Operation Characteristics

With the enlarging scale of doubly-fed induction generators (DFIGs) connected to power systems, it is important to analyze the influence of a short-circuit current to system relay protection. Due to the correct evaluation of the protection operation characteristics, the DFIG short-circuit current needs to be calculated accurately. But the current research on the short-circuit current of DFIG is based on the following assumption: the rotor excitation current is zero after the rotor crowbar is put, and the influence of its dynamic process is ignored. This will bring errors to the calculation results. This paper takes into account the influence of rotor current dynamics by studying the mechanism of the potential transient change of DFIG. The stator rotor flux linkage of DFIG in the event of a three-phase short-circuit is accurately calculated, and an improved RMS calculation method of doubly-fed wind turbine short circuit current is proposed. A physical experiment platform with an actual controller of a doubly-fed fan is established, based on RTDS. It can be seen from the experiment that the short-circuit current calculation method proposed in this paper is more accurate than those methods that ignore the rotor dynamic process. This study lays a foundation for further study of the influence of DFIG on the protection operation characteristics.

scholarly journals A Practical Short-Circuit Current Calculation Method for DFIG-Based Wind Farm Considering Voltage Distribution

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 31774-31781 ◽  
Author(s):  
Wenxia Pan ◽  
Mingyang Liu ◽  
Kun Zhao ◽  
Yibo Zhang ◽  
Tongchui Liu
Keyword(s):  
Calculation Method ◽  
Wind Farm ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Voltage Distribution ◽  
Current Calculation
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