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Accelerated Life Test Study on Thyristors of HVDC Converter Valve
Cuicui Liu,Ning Liang,Yating Gou,Jiachen Tian,Fang Zhuo,Feng Wang 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
As the key component of HVDC converter valve system, thyristors have vital impact on the reliability of the entire HVDC transmission project. In order to effectively obtain the life model of thyristor, this paper uses the existing accelerated life test theory, combined with the operating conditions of the converter valve and the relevant characteristics of the thyristors, to deeply analyse the several stress levels that have the most serious impact on the life of the thyristors. An accelerated life test scheme that can effectively guide the life model of the thyristor, according to the test data collected by this test method, the thyristor junction temperature life model under the short-circuit current stress is established, and compared with the thyristor failure rate in the practical engineering, the results show the feasibility of the test scheme and the correctness of the life model.
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Novel asymmetric duty modulation for DAB converters to improve light load efficiency
Feng Wang,Xinyu Cui,Fang Zhuo,Jiachen Tian,Zhi Zheng,Ruixin Xu 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.4
In a DC distribution network, the solid-state transformer (SST) and energy storage systems require an isolated bidirectionalDC–DC converter (IBDC). Among the many IBDCs, the dual active bridge (DAB) converter has been widely studied dueto its advantages in terms of high power density and high efficiency. The traditional control strategy for DAB is phase shiftcontrol. However, when the primary and secondary side voltages do not match, the soft-switching characteristic and increasingcurrent in the phase shift control affect the application of DAB in scenarios involving input and output voltage changes. To improve the above-mentioned defects, a novel asymmetric duty modulation (ADM) control is proposed in this paper. Among the various multi-variable ADM controls, the two-variable ADM control is simple, but its current is higher under light loads. To improve this defect, this paper introduces trapezoidal modulation (TZM) control proposed for phase shift control into ADM to form a similar TZM (STZM) control corresponding to TZM control. This paper first expounds the basic principle of STZM control. On this basis, its basic characteristics are researched. With current stress as the optimization goal, an optimal STZM (OSTZM) control scheme with minimum current stress is proposed, and the effectiveness of the theoretical analysis is verified on the experimental bench. The result shows that STZM control can improve efficiency under light loads by reducing the current and ensuring full ZVS.
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