Multilevel Converters for Industrial Applications by Sergio Alberto Gonzalez

By Sergio Alberto Gonzalez

Sleek semiconductor units have reached excessive present and voltage degrees, and their power-handling limits should be prolonged in the event that they are utilized in multilevel converter configurations. To create high-performance and trustworthy keep watch over designs, despite the fact that, engineers desire in-depth knowing of the features and operation of those topologies. Multilevel Converters for commercial functions offers an intensive and complete research of multilevel converters with a typical DC voltage resource. The e-book deals a singular standpoint to aid readers comprehend the foundations of the operation of voltage-source multilevel converters as energy processors, and their functions and boundaries. The booklet starts off with an summary of medium-voltage energy converters and their purposes. It then analyzes the topological features of the diode-clamped multilevel converter, the flying capacitor multilevel converter, and the uneven cascaded multilevel converter. for every topology, the authors spotlight specific keep watch over concerns and layout trade-offs. in addition they boost suitable modulation and keep watch over ideas. various graphical representations reduction within the research of the topologies and are invaluable for starting the research of latest multilevel converter topologies. The final chapters of the booklet discover case reports that study the habit of the cascade uneven multilevel converter as a distribution static compensator and shunt energetic energy clear out, and the habit of the diode-clamped topology configured as a back-to-back converter. those case reviews show find out how to deal with the linked keep watch over issues of complex keep an eye on and modulation schemes. analyzing contemporary advances, this publication offers deep perception at the layout of high-power multilevel converters and their purposes. it's a helpful reference for a person attracted to medium-voltage strength conversion, that's more and more getting used in and in renewable strength and allotted new release platforms to enhance potency and operation flexibility.

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For state 01 the current flows through the switches S1 , S2, and the capacitor C2. So, the capacitor loses charge and its voltage decreases. On the other hand, for state 10 the current flows through the DC link, S1, S2 , and C2. Now, the current changes the flowing direction across C2, so the electric charge of the capacitor increases and its voltage increases. Hence, both states have a complementary action, provided that they are applied for the same amount of time in each switching cycle. So, this condition is required to maintain the voltage level on C2.

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21 Asymmetric topology or HMC. it is possible to increase the number of voltage levels by adopting different DC voltage sources, which follow certain relationships among them. For example, a two-stage CCMC in which the DC voltage source of one stage doubles the voltage source of the other [13] generates a seven-level HMC (7L-HMC) instead of the 5L-CCMC obtained with equal voltage sources. In a two-stage CCMC with equal DC voltage sources there exist some states in which the voltage generated by one stage cancels the voltage generated by the other.

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