An Improved Hybrid MMC with Thyristor-Switched Supercapacitors for Fault Ride-Through Support

被引：1

作者：

Wang, Zhen ^{[1
]}

Peng, Li ^{[1
]}

Xiao, Yuntao ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, Sch Elect & Elect Engn, State Key Lab Adv Electromagnet Engn & Technol, Wuhan, Peoples R China

来源：

2021 IEEE 12TH ENERGY CONVERSION CONGRESS AND EXPOSITION - ASIA (ECCE ASIA) | 2021年

基金：

中国国家自然科学基金;

关键词：

hybrid modular multilevel converter; dc fault ride-through; thyristor; supercapacitor; MODULAR MULTILEVEL CONVERTERS; CELLS;

D O I：

10.1109/ECCE-Asia49820.2021.9479086

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The hybrid MMC (HMMC) based on half fullbridge submodules (FBSMs) and half half-bridge submodules (HBSMs) has become a promising topology in HVDC for its dc fault ride-through capability. However, without extra energy storage units (ESUs), a huge power shortage of ac-side during dc fault will inevitably occur. The sudden power loss may cause a significant frequency drop and load shedding, which reduces the stabilty and economy of ac grid. Therefore, an improved HMMC with thyristor-switched supercapacitors (SCs) is discussed in this paper. Compared with the general HMMC, no extra IGBTs are required and FBSMs are ultilized not only to generate the MMC output, but also to transfer the energy between SM capacitors and SCs. By appropriate control, voltage deviation of SM capacitors can be avoided in various conditions, which is proved by quantitative analysis. Simulation results validate the effectiveness of the proposed scheme.

引用

页码：1105 / 1109

页数：5