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Estimation of sub-module capacitor voltages in Modular Multilevel Converters
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| Author(s) |
Salvatore D'ARCO, Jon Are SUUL |
| Abstract |
This paper presents a method for estimating the voltages at the individual sub-module capacitors ofModular Multilevel Converters (MMCs). The estimation method is designed according to a predictor-corrector scheme with a model-based prediction stage utilizing the arm current measurements and theinternal modulation signals of the control system. The corrector stage is based on measurement of thetotal output voltage from each arm of the MMC. Thus, only two voltage measurements for each phaseof the MMC must be continuously processed by the control system instead of individual voltagemeasurements for each sub-module. This can significantly reduce the communication requirements forthe MMC control system and by that simplify the implementation. The principles of the proposedestimation method are described in detail in the paper, and the operation is demonstrated by simulationresults. Estimation accuracy and settling time of the proposed method have been investigated withrespect to the number of sub-modules in each arm of the MMC. Quantization effects due to limitedresolution of the arm voltage sensors and the influence of parameter deviations have also beenconsidered. The presented results illustrate the response of the proposed algorithm and indicate itspotential for limiting the communication requirements and increasing system reliability by reducingthe control system dependency on individual sub-module capacitor voltage measurements. |
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| Filename: | 0299-epe2013-full-11533982.pdf |
| Filesize: | 362.5 KB |
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| Type |
Members Only |
| Date |
Last modified 2014-02-09 by System |
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