Performance Analysis of Single Loop Current Controller at Grid Side Inverter Regarding LCL Filter Parameters and System Delay.

In the grid-connected systems, LCL filters are widely used for eliminating the generated switching current ripples due to better attenuation in comparison with L or LC filter. However, it is known that stability of digital controlled LCL filter can present a challenge due to induced delay. This paper presents conditions of system stability in dependence of filter characteristics such as resonant frequency, inductors and capacitor parameter variations. Stability analysis and system performance are observed and compared. Derived results are tested and confirmed on Hardware-in-the-loop HIL402 device. Obtained results are discussed and suggestions are provided in terms of the practical implementation of the control system. [ABSTRACT FROM AUTHOR]