A Virtual Direct Current Control Method of LCL-DAB DC-DC Converters for Fast Transient Response and No Backflow Power

The LCL-type dual active bridge (LCL-DAB) DC-DC converter is a promising part for DC micro-grids due to its high voltage gain and low current, but the issues of backflow power elimination transient response optimization deserve attention in operation. In this article, virtual direct current control (VDCC) method LCL-DAB fast no proposed, which can eliminate improve against input load disturbances. With dual-phase-shift (DPS) modulation scheme, voltage-current characteristics are first analyzed using phasor method. small-signal mathematic model then established. characteristic derived so design regions be graphed. On basis, an appropriate outer phase shift ratio estimated ensure wide range Moreover, generated compensate loop, thus disturbances improved under power. Simulation prototype experimental results presented verify feasibility proposed VDCC