An Optimization Method for DC Side Voltage Balance Control of HC-SVG based on Delay Signal Cancellation

Xiaofan Zhao; Shaotong Du

doi:10.6919/ICJE.202510_11(10).0013

Authors

Xiaofan Zhao
Shaotong Du

DOI:

https://doi.org/10.6919/ICJE.202510_11(10).0013

Keywords:

Hybrid Cascaded SVG; Harmonics; Fast Delay Signal Cancellation; Vector Triangle; Filter.

Abstract

Abstract: The integration of NPC high-voltage power units into HC-SVG systems introduces high harmonics in the DC capacitor voltage of the CHB unit and NPC DC bus side capacitor voltage, impacting device compensation performance. This study presents a comprehensive analysis of the DC side capacitor voltages of the CHB and NPC units, identifying and assessing their harmonic components. Subsequently, a filter scheme is devised utilizing the delay-cancellation method based on the triangle vector principle to optimize the DC voltage control of the CHB and NPC units. A simulation platform is constructed to validate the proposed theoretical framework. Results demonstrate that the optimized control strategy markedly enhances the compensation capabilities of HC-SVG systems, leading to a notable reduction in total harmonic distortion in both output voltage and compensation current under identical operational conditions, thereby enhancing the compensation performance of HC-SVG systems.

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References

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