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Power Conditioning System with Cascaded H-Bridge Multilevel Converter – DC-link Voltage Balancing Method
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| Author(s) |
Marcin ZYGMANOWSKI, Boguslaw GRZESIK, Jaroslaw MICHALAK |
| Abstract |
Multilevel converters have become an attractive choice for high voltage and high power applications. One of the most popular multilevel converter topologies is the cascaded H-bridge converter. Besides its simplicity this topology requires separate DC sources. In electric drive applications these DC sources are normally performed by multi-winding transformers with diode rectifiers. In STATCOM or PWM rectifiers there is no need to utilize multi-winding transformers but the DC-link is distributed. This feature can be exploited in the power conditioning system (PCS) with distri¬buted energy storage e.g. supercapacitors. The paper focuses on the DC-link voltage balancing method in the multilevel cascaded H-bridge converter. This method is based on additional voltage components generated at the output of the cascaded H-bridge converter. It is assumed that the proposed method does not affect the AC-side currents of the PCS. Inserting the voltage components of fundamental frequency, together with AC-side currents, allows exchanging active power between the H-bridge converters and results in balancing the DC-link voltages. In the paper, balancing voltage components are distinguished into two types. The first components can balance DC-link voltages in each phase of the cascaded H-bridge converter separately and the second components allow exchanging the energy between the phases |
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| Filename: | 0921-epe2011-full-18233508.pdf |
| Filesize: | 779.8 KB |
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| Type |
Members Only |
| Date |
Last modified 2012-01-26 by System |
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