Modeling and Design of Split-Pi Converter

Abstract

High-power bidirectional dc–dc converters are being widely employed in renewable energy interfacing, energy storage, electric vehicle charging, military, aerospace, and marine applications. Among various bidirectional topologies documented in the literature for dc–dc power conversion, the split-pi converter invites special attention with regard to applications involving multi-phase systems requiring high-power density. This paper endeavors to present the small-signal modeling of the split-pi converter in its various operating modes. Subsequently, the dynamic characteristics of the converter are studied, and appropriate control design is presented for stable operation of the converter. Frequency response plots are illustrated, and a hardware prototype model of the converter is designed and implemented.

Modeling and Experimental Validation of a Voltage-Controlled Split-Pi Converter Interfacing a High-Voltage ESS with a DC Microgrid

“…On the other hand, only six papers studied the performance of the Split-pi under a closed-loop control [19][20][21][22][23][24]. In particular, ref.…”

“…In particular, ref. [19] focused on the regulation of the internal bulk capacitor's voltage and [20,21] regulated the output voltage of the converter connected to a passive load, whereas [22] controlled the power flow in a Split-pi connected to a microgrid with stiff voltage regulation.…”

“…It can work in four operating modes, which depend on the relationship between the voltage at the input and output ports and the power flow direction, according to Table 1. As a matter of fact, there are not many papers on the Split-pi available in the literature [11][12][13][14][15][16][17][18][19][20][21][22][23][24]. In particular, refs.…”