Zhongchen Pei, Dehao Kong, Chao Liu, Chuang Liu, Dongbo Guo, Di Zhu, Yuanxiang Sun, Marcelo Lobo Heldwein,
... structure and applying various types of isolated submodule (ISM), the proposed SST can function as a step-down rectifier, where U MVDC < U MVAC(p-p) . In this case, the power electronics converters used to connect downstream medium-voltage direct current (MVdc) link and ... topology and modulation strategy of two types of ISMs are discussed. In addition, this article provides a detailed analysis of operation principles, power flow, grid-tied control, and system reliability. Moreover, the proposed converter is compared with other SST topologies in terms of key performance indicators, such as peak efficiency, system volume, and number of active semiconductor devices. Finally, a 300-V/20-kW scaled-down prototype is developed, ...
Tópico(s): Multilevel Inverters and Converters
2023 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Power Electronics
Jeffrey D. P. Kenney, Vera Rubin, P. Planesas, Judith S. Young,
... the origin for most features of the disturbed ISM in the system is a high-velocity ISM-ISM collision between the massive gas-rich galaxy NGC ... ultimately fall back into the galaxy. The disturbed ISM in NGC 4438 is similar in many ways ...
Tópico(s): Stellar, planetary, and galactic studies
1995 - IOP Publishing | The Astrophysical Journal