What is it about?
In this article, a new and generalized SC-PWM scheme for multilevel converters is proposed. Compared with the prior SC-PWM approaches, the proposed one enables easier digital implementation while producing identical switching patterns as the MC-PD-PWM method at any operating point. The proposed switching strategy relies on a simple decoding function of the voltage levels generated by the SC-PWM modulator. As per switching cycle, the proposed strategy imposes the appropriate SSs of H-bridge cells such that only the needed commutations are executed. Therefore, this approach produces a minimum number of power device commutations, leading to a quarter symmetrical output voltage at the H-bridge cell level, which subsequently improves the converter harmonic performance and reduces the overall inverter switching losses.
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Why is it important?
In this article, a new and generalized SC-PWM scheme for multilevel converters is proposed. Compared with the prior SC-PWM approaches, the proposed one enables easier digital implementation while producing identical switching patterns as the MC-PD-PWM method at any operating point. The proposed switching strategy relies on a simple decoding function of the voltage levels generated by the SC-PWM modulator. As per switching cycle, the proposed strategy imposes the appropriate SSs of H-bridge cells such that only the needed commutations are executed. Therefore, this approach produces a minimum number of power device commutations, leading to a quarter symmetrical output voltage at the H-bridge cell level, which subsequently improves the converter harmonic performance and reduces the overall inverter switching losses.
Perspectives
The proposed optimized switching method, which reduces the overall converter switching losses, might create thermal discrepancies among the modules, potentially wearing out that module, which will then have an impact on the overall lifespan of that H-bridge. This result is a drawback of the proposed method, which can be addressed by adding a thermal surveillance function in the protective functionalities of the system.
Dr Fils Pascal Mpomboum Lingom
Baylor University
Read the Original
This page is a summary of: A Generalized Single-Carrier PWM Scheme for Multilevel Converters, IEEE Transactions on Power Electronics, October 2021, Institute of Electrical & Electronics Engineers (IEEE),
DOI: 10.1109/tpel.2021.3073748.
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