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Aliasing Effect in Real-Time Sampling for Grid-Connected LCL-LC-Filtered Inverter with Capacitor Current Feedback

For grid-connected inverter with LCL-LC filter, the filter resonance can usually lead to the system instability. Capacitor-Current-Feedback active damping can be adopted following the concept of adding a virtual resistor in parallel with the capacitor, in order to suppress the resonance. Note that the control delay in the digital control can result in the bandwidth limitation or even affect the stability of active damping. In view of this, the real-time sampling can be used to reduce the delay and improve the robustness. However, the real-time sampling in the digital signal processor causes the frequency aliasing and deteriorates the output current quality so that the application in the LCL inverter is quite limited. For now, the application of real-time sampling in the LCL-LC-filtered inverter is unclear. Therefore, this study deeply analyzes the aliasing phenomenon in the LCL-LC filter. Results show that the aliasing of capacitor current sampling in the LCL-LC filter is much lighter than that in the LCL filter, and the real-time sampling method can be directly adopted to reduce the influence of delay on the system while hardly compromising the current quality.