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Analysis and Validation for an Inverter-side Current Controller in LCL Grid-connected Power Systems
Journal of Modern Power Systems and Clean Energy ( IF 6.3 ) Pub Date : 2020-02-28 , DOI: 10.35833/mpce.2018.000505
Jose M. Sosa , Panfilo R. Martinez-Rodriguez , Gerardo Escobar , Gerardo Vazquez , Andres A. Valdez-Fernandez , Juan F. Martinez-Garcia

Transformerless grid-connected inverters offer greater efficiencies when transferring power from renewable energy sources to the electrical grid. If the grid-inverter connection is done with an LCL filter, high attenuation of switching harmonics is achieved while preserving a small-size output filter. However, damping must be included in the controller to assure closed-loop stability. This paper proposes a reference computation methodology for the inverter-side current feedback in a photovoltaic (PV) generation system connected to the grid through an LCL filter. Theoretical analysis of the closed-loop system stability and of the steady-state performance are presented as well as experimental validation of the closed-loop performance. The feedback controller includes active damping and relies on a resonant control structure which improves the ability of dealing with grid harmonic distortion. The controller uses a reduced set of measurements, which requires the inverter-side current and grid voltage only, and assures a power factor close to unity.

中文翻译:

LCL并网电力系统中逆变器侧电流控制器的分析与验证

从可再生能源向电网传输功率时,无变压器并网逆变器可提供更高的效率。如果使用LCL滤波器进行电网-逆变器连接,则可以在保持小型输出滤波器的同时,实现开关谐波的高衰减。但是,控制器中必须包含阻尼以确保闭环稳定性。本文提出了一种通过LCL滤波器连接到电网的光伏发电系统中逆变器侧电流反馈的参考计算方法。提出了闭环系统稳定性和稳态性能的理论分析,以及闭环性能的实验验证。反馈控制器包括有源阻尼,并依赖于谐振控制结构,该结构提高了处理电网谐波失真的能力。控制器使用减少的一组测量,这些测量仅需要逆变器侧的电流和电网电压,并确保功率因数接近于1。
更新日期:2020-04-22
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