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Dual-mode flyback inverters in grid-connected photovoltaic systems

机译：并网光伏系统中的双模反激式逆变器

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摘要

A dual-mode flyback inverter is proposed for photovoltaic power applications. The proposed dual-mode flyback inverter makes use of both discontinuous conduction mode (DCM) and continuous conduction mode (CCM) operations for more than 200 W power applications. However, it suffers from output current control problems such as low system gain during DCM and right-half-plain zero problem during CCM. To achieve accurate reference tracking, the authors propose to adopt the repetitive control scheme that increases the system gain at the fundamental and its harmonic frequencies of the grid. To reduce the burden from the conventional proportional-integral controller, the authors use the dual-mode nominal duty that helps the dual-mode flyback inverter generate the target output current while attenuating the effect of disturbances. To make the dual-mode flyback inverter operate at the maximum power point (MPP), the authors use the incremental conductance method that offers smooth transition to the MPP. The experimental results show that the proposed flyback system implemented for 200 W dual-mode flyback inverter prototype achieves high MPP tracking efficiency, low total harmonic distortion, high power conversion efficiency, and high power capacity.
机译：提出了一种双模式反激式逆变器，用于光伏发电应用。拟议的双模式反激式逆变器在200 W以上的功率应用中同时使用了不连续传导模式（DCM）和连续传导模式（CCM）。但是，它会遭受输出电流控制问题，例如DCM期间系统增益低和CCM时右半平面零问题。为了实现精确的参考跟踪，作者建议采用重复控制方案，该方案可在电网的基频及其谐波频率上增加系统增益。为了减轻传统比例积分控制器的负担，作者使用了双模式标称占空比，该占空比有助于双模式反激式逆变器生成目标输出电流，同时减弱干扰的影响。为了使双模反激式逆变器在最大功率点（MPP）下工作，作者使用了增量电导方法，该方法可平稳地过渡到MPP。实验结果表明，所提出的针对200 W双模反激逆变器原型实施的反激系统具有较高的MPP跟踪效率，较低的总谐波失真，较高的功率转换效率和较高的功率容量。

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