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This paper presents a dc capacitor voltage balancing control method for the star-connected cascaded H-bridge pulsewidth modulation converter in the static synchronous compensator applications. With the zero-sequence voltage injection as a basis for dc capacitors voltage balancing, this paper investigates the detailed power flow of the converter as a whole and within individual modules under unbalanced...
Multi-port isolated H-bridge converter has the features of high voltage conversion ratio, bidirectional power flow and high-power capacity, which is suitable to be integrated into DC microgrids. This paper uses three-port isolated H-bridge converters as the interfacing converters in power generation units which comprise distributed generation (DG) and energy storage (ES) in DC microgrid. The topology...
The electric arc furnaces (EAFs) are the major disturbances in the medium-voltage level of power system for the low frequency voltage variations, which lead to incandescent lamp flickering. In order to alleviate these voltage variations, the modular multilevel cascaded converter with the topology of single-delta bridge-cell (MMCC-SDBC) is used to the medium-voltage level flicker compensator application...
In this paper, according to the characteristic of AC-excited variable speed constant frequency wind turbine generation, stator voltage orientation vector control strategy is adopted in double-fed induction generator (DFIG). Firstly, the paper studies the running characters of DFIG, and the principle of DFIG under no-load cutting-in condition. Then according to the mathematical model of DFIG under...
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