A current-source DC-AC converter and control strategy for grid-connected PV applications

被引：5
作者：
Buzzio, Christian [1 ]
Poloni, Yamil S. [1 ]
Oggier, German G. [1 ]
Garcia, Guillermo O. [1 ]
机构：
[1] Univ Nacl Rio Cuarto, Inst Invest Tecnol Energet & Mat Avanzados IITEMA, CONICET, Rio Cuarto, Cordoba, Argentina
来源：
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS | 2023年 / 154卷
关键词：
PV power conversion system; Boost-buck converter; Grid-tie inverter; Pulse-width modulation; PR Controller; BOOST-BUCK CONVERTER; RESONANT CONTROLLERS; INVERTER; TRANSFORMER;
D O I：
10.1016/j.ijepes.2023.109399
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
This paper presents a two-stage current-source DC-AC converter for grid-connected PV applications which is composed of an input step-up stage, followed by a step-down stage and an unfolding inverter. A decentralized control strategy of the DC-DC stage allows maximizing the renewable energy harvest using an Incremental Conductance MPPT algorithm and synthesizing an output current to be injected into the grid with low harmonic distortion. Double-loop PI controllers are used for the boost stage. The DC bus voltage of the buck stage is regulated using a PI controller, and an inner Proportional-Resonant (PR) controller tracks a sinusoidal reference. The PR controller proposed in this paper, includes a reduced number of resonant stages meeting the energy quality required by standards, which results in good stability margins. Finally, a SOGI-FLL algorithm synchronizes the inverter operation with the grid. Experimental results show an excellent dynamic response of the system, and the injected current complies with the IEEE Std. 1547-2018 specifications regarding harmonic content using a control law with a low computational burden.
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页数：10
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