Impact and Mitigation of High-Frequency Side-Channel Noise Intrusion on the Low-Frequency Performance of an Inverter

This letter investigates and demonstrates, experimentally, the impact of a high-frequency side-channel noise intrusion (SNI) on an output-voltage feedback signal on the low-frequency performance of a three-phase inverter. The high-frequency SNI originates at frequencies that are in the vicinity of the sampling frequency (and its multiples) of the inverter. The resultant noise-injected output-voltage feedback signal is fed to a controlling digital signal processor that experiences feedback aliasing effect due sub-Nyquist-frequency sampling. The impacts of these aliasing effects are observed at sub- or super-60-Hz frequencies of the output voltages of the inverter. Subsequently, a Kalman-filter-estimation-based control approach is pursued to mitigate this detrimental effect and its efficacy demonstrated experimentally.