Abstract
This paper presents small-signal modeling, stability analysis, and controller design of a non-isolated bidirectional hybrid-modular DC-DC Converter for DC grid applications. The DC-DC converter can be used to interconnect two different DC voltage levels in a medium-/high-voltage DC grid. Half-bridge Sub-Modules (SMs) and a high-voltage valve are the main components of the converter. The high-voltage valve can be implemented via employing series-connected Insulated-Gate Bipolar Transistors (IGBTs). Operation with zero voltage switching of the involved high-voltage valve is feasible, i.e., there is no concern pertinent to dynamic voltage sharing among the series-connected IGBTs. The power is transferred from one side to another through the involved SMs, where their capacitors are connected in series across the high-voltage side, while they are connected sequentially across the low-voltage side. In this paper, the state-space averaging technique is employed to derive the small-signal model of the presented converter for controller design. Closed-form expression of the duty cycle-to-inductor current transfer function is extracted. Comparison between simulation results of the small-signal model and the detailed circuit model is presented to authenticate the accuracy of the derived small-signal model. Finally, a scaled-down prototype is used to verify the accuracy of the small-signal model.
Highlights
The DC-DC converters or DC transformers are widely used to transfer the DC-power between two different DC voltage levels in high-power conversion applications [1]
In [6], several architectures of switched-capacitor/switchedinductor Pulse Width Modulation (PWM) DC-DC converters have been examined for trasnformerless operation
This paper presents a linear state-space model for the non-linear non-isolated hybrid-modular DC-DC converter in [23], which can be utilized for small-signal modeling, dynamic studies, and controller design
Summary
AHMED ELSEROUGI 1, (Senior Member, IEEE), IBRAHIM ABDELSALAM 2, AHMED MASSOUD 3, (Senior Member, IEEE), AND SHEHAB AHMED 4, (Senior Member, IEEE). The statements made are solely the responsibility of the authors
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