Design of a univariate dual-loop voltage system based on the multisampling method

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.