Hybrid converter topologies for dc transmission systems.
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| Title: | Hybrid converter topologies for dc transmission systems. |
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| Authors: | Adam, Grain Philip1 grain.adam@strath.ac.uk, Alsokhiry, Fahad2, Abdelsalam, Ibrahim3, Fletcher, John4, Lie Xu1, Al-Turki, Yusuf2 |
| Source: | IET Power Electronics (Wiley-Blackwell). 2019, Vol. 12 Issue 3, p607-619. 13p. 6 Diagrams, 3 Charts, 13 Graphs. |
| Subjects: | Direct currents, Converters (Electronics), Independent system operators, Hybrid systems, Electric circuits |
| Abstract: | This study presents types 1 and 2 hybrid converters with reduced power circuit complexity compared with the mixed cell modular multilevel converter (MC-MMC). The type 1 converter is formed by replacing the director switches of the alternate arm converter by high-voltage (HV) half-bridge (HB) cells rated for half of the dc-link voltage. Also, it resembles special case of MC-MMC, where the entire HB cells of each arm are lumped into a single HV HB cell, with both capacitors of the half- and fullbridge cells are exposed to fundamental current as in the conventional MMC. The upper and lower arms of the type 2 converter resemble a front-to-front connection of two three-phase hybrid cascaded two-level converters, where the cell capacitors of the three-phase two-level converters that act as director switches do not experience fundamental currents. Therefore, the type 2 converter offers compact design compared with type 1 converter and the MC-MMC. The technical viabilities of the proposed hybrid converters are assessed using simulations, with both converters modelled in MATLAB-Simulink using electromagnetic transient simulation approach, considering normal and transient conditions. Experimental results obtained from single-phase type 1 converter confirm the practical viability of the proposed converters. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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