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This paper presents an average-value model of a line commutated converter-based HVDC system using dynamic phasors. The model represents the low-frequency dynamics of the converter and its ac and dc systems, and has lower computational requirements than a conventional electromagnetic transient (EMT) switching model. The developed dynamic-phasor model is verified against an EMT model of the CIGRE HVDC...
This paper analyzes mathematical approximations of the ac current of a line-commutated converter (LCC), which is the building block of conventional HVDC systems. The paper derives analytical expressions for the ac current of an LCC during the commutation and non-commutation periods and continues with calculating the percentage error of both the fundamental frequency component of the ac current and...
The Sigma delta modulation advantage is its special power spectrum density which is better from other modulation techniques from EMC point of view. The disadvantage of this modulation technique is its low dynamic response in the case of using conventional control methods. The proposed digital control method of this paper improves the dynamic response of boost power factor correction pre-regulator...
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