Magnetic integrated <i>LLCL</i> filter with resonant frequency above Nyquist frequency

This paper presents a design technique of magnetic integrated LLCL filters for grid-tied inverters. With the proposed technique, filter's resonant frequency can be higher than Nyquist frequency. Furthermore, concept was only reported LCL filter in previous research works. In addition, modulation process will produce dominant switching harmonics unipolar PWM H-bridge inverters at double Thus, putting beyond increase stability zone. The methods maximize inductors' utilization and resist grid impedance variations under weak conditions, depending on improved Comparative simulation HIL experimental results are presented to confirm effectiveness design. agree well with each other.