Novel grid connection interface for utility-scale PV power plants based on MMC

The Journal of Engineering

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[1] Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai, People's Republic of China;

关键词: DC-DC power convertors;    photovoltaic power systems;    power grids;    reactive power;    control system synthesis;    voltage-source convertors;    power supply quality;    power generation control;    utility-scale PV power plant;    novel grid connection interface;    DC boost interface;    DC-DC boost converters;    photovoltaic energy integration;    modular multilevel converter;    multistring topology;    centralised MMC;    two-level control system design;    reactive power transmission;    harmonic resonance;    synchronous stabilisation;    power quality;    PV generation integration capacity;    PSCAD-EMTDC;    solar irradiance;    energy storage system;   

DOI  :  10.1049/joe.2018.8911

来源: publisher

【 摘 要 】

The ever-increasing integration of photovoltaic (PV) energy has led to the fast development of utility-scale PV power plants worldwide. A novel grid connection interface for utility-scale PV power plants based on the modular multi-level converter (MMC) is explored. The grid connection interface is a DC boost interface by nature. It adopts the multistring topology, employs DC/DC boost converters, utilises a centralised MMC, and integrates an energy storage system. Meanwhile, the two-level control system for the DC boost interface is also designed. Compared with the conventional AC boost interfaces, the proposed DC boost interface avoids problems regarding reactive power transmission, harmonic resonance, and synchronous stabilisation. It also improves the power quality, efficiency, and the integration capacity of the PV generation. A case study of a utility-scale PV power plant with the DC boost interface is carried out in PSCAD/EMTDC. The simulation results validate the effectiveness and the merits of the DC boost interface under different operation conditions. The proposed DC boost interface proves more suitable for utility-scale PV power plants in areas with high solar irradiance. It also lays a solid foundation for the future research regarding the control and protection of utility-scale PV power plants.

【 授权许可】

CC BY