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Arm Voltage Estimation Method for Compensated Modulation of Modular Multilevel Converters

Taffese, Abel Assegid; Tedeschi, Elisabetta; de Jong, Erik
Chapter, Conference object
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URI
http://hdl.handle.net/11250/2476520
Date
2017
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  • Publikasjoner fra CRIStin - NTNU [21809]
Original version
2017 IEEE Manchester PowerTech   10.1109/PTC.2017.7980879
Abstract
The Modular Multilevel Converter (MMC), being a complex system, requires a number of controllers to function properly. These range from low level switching pattern generation to high level control loops. Among these controllers are modulation techniques that calculate the insertion indices, control inputs that decide the number of sub-modules inserted in a given arm. One such technique is compensated modulation which divides the reference voltages, generated by high level controllers, by the respective arm voltages (sum of capacitor voltages) when calculating the insertion indices. This prevents the arm voltage ripple from affecting the generated output voltage. For this purpose, the arm voltages can be measured (closed-loop approach) or estimated (open-loop approach). This paper presents an arm voltage estimation technique for compensated modulation of MMCs. The proposed technique combines the benefits of the open-loop approach with that of the closed loop one.
Publisher
IEEE

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