Abstract
AC (alternating current) system backup protection setting calculation is an important basis for ensuring the safe operation of power grids. With the increasing integration of modular multilevel converter based high voltage direct current (MMC-HVDC) into power grids, it has been a big challenge for the AC system backup protection setting calculation, as the MMC-HVDC lacks the fault self-clearance capability under pole-to-pole faults. This paper focused on the pole-to-pole faults analysis for the AC system backup protection setting calculation. The principles of pole-to-pole faults analysis were discussed first according to the standard of the AC system protection setting calculation. Then, the influence of fault resistance on the fault process was investigated. A simplified analytic approach of pole-to-pole faults in MMC-HVDC for the AC system backup protection setting calculation was proposed. In the proposed approach, the derived expressions of fundamental frequency current are applicable under arbitrary fault resistance. The accuracy of the proposed approach was demonstrated by PSCAD/EMTDC (Power Systems Computer-Aided Design/Electromagnetic Transients including DC) simulations.
Highlights
AC system protection setting calculation is an important basis for ensuring the safe operation of power grids
Has influenced the AC system backup protection setting calculation, to the extent that the impact cannot be ignored, as more multi-level modular converter (MMC)-HVDCs with higher capacity and voltage level are being integrated into power grids
This paper proposed a simplified analytic approach of pole-to-pole faults in MMC-HVDC for the AC system backup protection setting calculation
Summary
AC (alternating current) system protection setting calculation is an important basis for ensuring the safe operation of power grids. If a AC circuit breaker malfunctions, the fault needs to be detected and cleared by the upstream protection devices This kind of fault clearing method in MMC-HVDC has influenced the AC system backup protection setting calculation, to the extent that the impact cannot be ignored, as more MMC-HVDCs with higher capacity and voltage level are being integrated into power grids. It is essential to develop a simplified analytic approach of pole-to-pole faults in MMC-HVDC for the AC system backup protection setting calculation. C.Y. et al [23] presented a pole-to-pole fault current calculation method for DC grids on the premise that the MMC was not blocked He et al [24] investigated the distance protection of AC gird with. A simplified analytic approach of the pole-to-pole faults in MMC-HVDC for the AC system backup protection setting calculation is proposed.
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