Application of Current-transferring Submodule in Modular Multilevel Converter

In order to solve the problem that the traditional half-bridge module cannot clear the DC fault, a current-transferring submodule based on the parallel thyristor and the reverse-blocking IGBT is proposed. The topology and operating principle of the current-transferring submodule are introduced in detail, and its steady state control strategy is the same as the half-bridge submodule. Then, according to its current limiting principle, the DC fault control protection strategy of MMC based on the current-transferring submodule is proposed. At last, the simulation model is built in PSCAD/EMTDC, and the effectiveness of the proposed submodule topology and the control and protection strategy in DC fault clearing has been verified by the simulation results.

[1]  Chengyong Zhao,et al.  The Research of SM Topology With DC Fault Tolerance in MMC-HVDC , 2015, IEEE Transactions on Power Delivery.

[2]  吴婧,et al.  The Study of MMC Topologies and Their DC Fault Current Blocking Capacities in DC Grid , 2015 .

[3]  T. Leibfried,et al.  Effects of DC fault clearance methods on transients in a full-bridge monopolar MMC-HVDC link , 2016, 2016 IEEE Innovative Smart Grid Technologies - Asia (ISGT-Asia).

[4]  Trillion Q. Zheng,et al.  Reverse blocking sub-module based modular multilevel converter with DC fault ride-through capability , 2016, 2016 IEEE Energy Conversion Congress and Exposition (ECCE).

[5]  P. Bauer,et al.  Providing dc fault ride-through capability to H-bridge MMC-based HVDC networks , 2015, 2015 9th International Conference on Power Electronics and ECCE Asia (ICPE-ECCE Asia).

[6]  V.G. Agelidis,et al.  VSC-Based HVDC Power Transmission Systems: An Overview , 2009, IEEE Transactions on Power Electronics.

[7]  Yu Bo.  New HVDC power transmission technology:MMC-HVDC , 2012 .

[8]  Rong Zeng,et al.  Precharging and DC Fault Ride-Through of Hybrid MMC-Based HVDC Systems , 2015, IEEE Transactions on Power Delivery.

[9]  I. A. Gowaid.  A Low-Loss Hybrid Bypass for DC Fault Protection of Modular Multilevel Converters , 2017, IEEE Transactions on Power Delivery.

[10]  Wu Jin,et al.  The Study of MMC Topologies and Their DC Fault Current Blocking Capacities in DC Grid , 2015 .

[11]  Wenhua Liu,et al.  Protection of Nonpermanent Faults on DC Overhead Lines in MMC-Based HVDC Systems , 2013, IEEE Transactions on Power Delivery.