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Evaluation of High Step-up Power Conversion Systems for Large-capacity Photovoltaic Generation Integrated into medium voltage dc grids

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Chinese Journal of Electrical Engineering 2021年第4期7卷 3-14页

作者： Shilei Lu Kai Sun Haixu Shi Yunwei Li Guoen Cao Department of Electrical Engineering Tsinghua UniversityBeijing 100084China Department of Electrical and Computer Engineering University of AlbertaEdmonton AB T6G2R3Canada Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China

With the increase of dc based renewable energy generation and dc loads,the medium voltage dc(MVdc)distribution network is becoming a promising option for more efficient system integration.In particular,large-capacity photovoltaic(PV)-based power generation is growing rapidly,and a corresponding power conversion system is critical to integrate these large PV systems into MVdc power grid.Different from traditional ac grid-connected converters,the converter system for dc grid interfaced PV system requires large-capacity dc conversion over a wide range of ultra-high voltage step-up ratios.This is an important issue,yet received limited research so far.In this paper,a thorough study of dc-dc conversion system for a medium-voltage dc grid-connected PV system is conducted.The required structural features for such a conversion system are first discussed.Based on these features,the conversion system is classified into four categories by series-parallel connection scheme of power modules.Then two existing conversion system configurations as well as a proposed solution are compared in terms of input/output performance,conversion efficiency,modulation method,control complexity,power density,reliability,and hardware cost.In-depth analysis is carried out to select the most suitable conversion systems in various application scenarios.

关键词： Photovoltaic generation dc-dc conversion medium voltage dc grid large-capacity ultra-high voltage transfer ratio

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