Resonant LCL Converter with Frequency-Pulse-Width Control

Abstract

The paper considers the features of frequency-pulse-width control in a resonant LCL converter with an active rectifier in the mode of parametric stabilization of the output current. The analysis of the properties of the LCL converter during regulation by the rectifier is carried out, the phase frequency characteristic and the coefficient of parametric stabilization are obtained. It is shown that the rectifier introduces a reactive component into the impedance of the resonant circuit. It is illustrated that the introduction of the control angle leads to the loss of roots by the equation on a part of the load range. The estimation of the frequency adjustment in the converter is carried out, the control characteristic is obtained, the energy advantages of frequency-pulse-width control are demonstrated, which consists in the zero phase of the inverter current and minimization of the recuperation interval