Study on MVDC Grid-connected Scheme Based on Modular LLC Resonant Converters for Photovoltaic Energy

CHEN Jiaxi; JIANG Daozhuo; ZHANG Chong; HU Liexiang; LU Li

doi:10.3969/j.issn.1000-7229.2018.10.006

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Electric Power Construction ›› 2018, Vol. 39 ›› Issue (10) : 44-53. DOI: 10.3969/j.issn.1000-7229.2018.10.006

Study on MVDC Grid-connected Scheme Based on Modular LLC Resonant Converters for Photovoltaic Energy

CHEN Jiaxi1，JIANG Daozhuo1，ZHANG Chong1，HU Liexiang2，LU Li2

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Abstract

Different from traditional forms large-scale photovoltaic energy integrates into AC network or low-voltage DC grid, photovoltaic power generation connected to MVDC distribution system has some advantages, such as large capacity, higher efficiency, voltage stability and power quality. It is an energy pooling technology needed for the development of DC distribution network in the future. Firstly, a scheme for medium or large capacity photovoltaic power generation system to access DC distribution network is proposed and a topology of the system is designed. Through analysis on the characteristics of photovoltaic cells and the operating characteristics of sub-modules, a new control strategy for modular LLC converter is designed as well as the parameters of generating units and sub-modules. The control system achieves voltage and current sharing and realizes the maximum power tracking of the photovoltaic unit. Finally, the feasibility of the proposed scheme and control system are verified by simulation.

Key words

DC distribution network / LLC resonant converter / DC grid-connected photovoltaic power system / control system

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CHEN Jiaxi，JIANG Daozhuo，ZHANG Chong，HU Liexiang，LU Li. Study on MVDC Grid-connected Scheme Based on Modular LLC Resonant Converters for Photovoltaic Energy[J]. Electric Power Construction. 2018, 39(10): 44-53 https://doi.org/10.3969/j.issn.1000-7229.2018.10.006

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