PROJECT TITLE :
DC-Link Voltage Coordinated-Proportional Control for Cascaded Converter With Zero Steady-State Error and Reduced System Type
Cascaded converter is made by connecting two subconverters together, sharing a typical intermediate dc-link voltage. Regulation of this dc-link voltage is often realized with a proportional-integral (PI) controller, whose high gain at dc helps to force a zero steady-state tracking error. Such precise tracking is, however, at the expense of skyrocketing the system sort, caused by the additional pole at the origin introduced by the PI controller. The system might, hence, be harder to regulate. To scale back the system sort whereas preserving precise dc-link voltage tracking, this paper proposes a coordinated management scheme for the cascaded converter, that uses solely a proportional dc-link voltage regulator. The ensuing converter is so dynamically faster, and when compared with the standard PI-controlled converter, it is less tormented by impedance interaction between its two subconverters. The proposed theme can be used with either unidirectional or bidirectional power flow, and has been verified by simulation and experimental results presented in this paper.
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