Design of a univariate dual-loop voltage system based on the
multisampling method
Abstract
This study presents an innovative control framework designed for voltage
source inverters (VSIs) equipped with LC output filters. The primary
objective of this control structure is to reduce delay and suppress
aliasing by employing a voltage double-loop univariate active damping
strategy.The stability of the system is degraded because the control
delay limits the bandwidth of the system.It has been shown that although
the multisampling method can effectively reduce the delay,it also
suffers from the problems of pulse loss and multiple comparisons, which
leads to significant aliasing and ultimately affects the output power
quality.To solve this problem, a multiple notch filter with small phase
delay is adopted to suppress aliasing.The optimal parameters of the
system are determined by considering the filter parameters, filtering
effect, output voltage ripple content, and system performance in
combination with the actual filtering requirements and circuit size.Its
effectiveness and performance are carefully verified by experimental
results.