Comparison of High Power DC-DC Converters for Photovoltaic Generation Integrated into Medium Voltage DC Grids

Lu, Shilei; Sun, Kai; Shi, Haixu; Jiang, Siyue; Li, Yunwei

doi:10.1109/peac.2018.8590591

Cited by 4 publications

(1 citation statement)

References 9 publications

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“…Meanwhile, the DC/DC converter must have high reliability and efficiency as the traditional grid-connected inverter and transformers. Traditional low voltage two-level DC/DC converter topologies cannot directly meet the HV application technical requirements due to the limitations of voltage and current capacity of semiconductor power devices, and the insulated gate bipolar translator (IGBT) series scheme suffers from the dynamic voltage and current sharing problem [12].…”

Section: Introductionmentioning

confidence: 99%

Photovoltaic Power Plant Collection and Connection to HVDC Grid with High Voltage DC/DC Converter

Huang

Wang

et al. 2021

Electronics

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Photovoltaic (PV) power plant collection and connection to a high voltage direct current (HVDC) grid has many advantages. Compared with the traditional AC collection and grid-connection scheme, it can reduce the power conversion links and improve the system efficiency. As one of the most important devices in the application of a PV HVDC collection and grid-connection system, a high voltage, large capacity, high step-up ratio DC/DC converter is the critical technology. A DC/DC converter scheme based on a boost full bridge isolated power module cascaded in input parallel output series (IPOS) structure is proposed to meet the technical requirements of PV power conversion with high voltage, large capacity, and high step-up ratio. The operation mode of the power module is analyzed, the soft switching method is proposed, and the constraint to realize the soft switching of the power module is deduced. Aiming to resolve the problem of multi-module voltage and current equalization in a cascaded DC/DC converter, a distributed module equalization control strategy is proposed to realize the reliable operation of a power module and converter. A 5 kV/80 kW standard power module is developed, the DC/DC converter experimental platform is built, and the proposed system scheme and control strategy are verified by experiments. Based on a 14-power module input parallel output series connection, a ±30 kV/1 MW PV DC/DC converter is developed, a ±30 kV PV HVDC collection and grid-connection demonstration system is established, and the experimental test is completed to realize the stable operation of the system.

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Section: Introductionmentioning

confidence: 99%