Title :
The Research of SM Topology With DC Fault Tolerance in MMC-HVDC
Author :
Jianpo Zhang ; Chengyong Zhao
Author_Institution :
State Key Lab. of Alternate Electr. Power Syst. with Renewable Energy Sources, North China Electr. Power Univ., Beijing, China
Abstract :
The high voltage direct current transmission system based on modular multilevel converter (MMC-HVDC) technology is now studied and used widely. But traditional half bridge topology of sub module (HBSM) of MMC can´t block dc link fault current because of the freewheeling effect of diodes. In order to solve this problem, firstly, this paper improves HBSM topology, a series connected double sub module (SDSM) is designed and dc link fault current blocking capability is realized without tripping ac circuit breaker, so MMC-HVDC with this improved topology can immediately rebuild dc link voltage and resume power transmission. Secondly, the self starting and fault disposing procedure are also designed. At last, simulations in the software PSCAD/EMTDC are carried out to verify its effectiveness and feasibility.
Keywords :
HVDC power convertors; fault currents; fault diagnosis; starting; HBSM; MMC-HVDC technology; SDSM; dc link fault current blocking capability; dc link voltage; fault disposing procedure; freewheeling effect; half bridge topology of sub module; high voltage direct current transmission system; modular multilevel converter technology; self starting; series connected double sub module; Capacitors; Circuit faults; Insulated gate bipolar transistors; Rectifiers; Switches; Topology; Voltage control; DC current blocking; modular multilevel converter (MMC); self startup; series-connected double submodule;
Journal_Title :
Power Delivery, IEEE Transactions on
DOI :
10.1109/TPWRD.2015.2399412
