A Low Delay Anti-Aliasing Method of Multisampling for Grid-tied Inverter with LCL Filter

When the high-power LCL-typed grid-tied inverters reduce the power loss by limiting switching frequency, it would increase control delay and limit bandwidth of control system. Multisampling is an attractive method to reduce delay, which can increase the system bandwidth and stability margin, but it is inevitable to sample switching harmonics. Therefore, a low delay anti-aliasing multisampling method is proposed to eliminate switching harmonics and reduce the influence of filter delay at the same time. It only brings T
sw
/8 delay, which can increase bandwidth and improve dynamic response ability. The effectiveness of this method is verified by simulation analysis under the inherent damping single loop control of inverter-side current feedback.