A Novel Extended Pole Bus Protection for LCC～MMC Hybrid HVDC System

作者：Wang, Jian; Zhang, Yanxia^*

来源：Journal of Electrical Engineering & Technology, 2022, 17(6): 3195-3205.

DOI：10.1007/s42835-022-01132-0

• LCC similar to MMC HVDC
• Extended pole bus protection
• DC current direction
• DC bus
• Smoothing reactor
• DC filter

Aiming at the present situation that the existing pole bus protection for the LCC similar to MMC hybrid HVDC system is simple in principle and cannot protect DC filter, this paper proposes a novel extended pole bus protection principle. Firstly, it constructed the equivalent circuits of LCC similar to MMC hybrid HVDC system in the normal operation state, fault on the elements within the protection zone, and DC transmission line fault, respectively, analyzed the direction of DC current on each measurement point in each case. On these bases, this paper proposed a DC current direction-based extended pole bus protection principle, and theoretically proved that the fault on DC transmission line and the AC system will not cause the maloperation. Compared with the existing pole bus protection, the proposed protection not only cover its protection zone, but also can reflect the fault on the DC filter branch. The simulation results verified that the proposed protection has clear selectivity for the internal fault and external fault.

• 单位
  天津大学