Frequency-based current-sharing techniques for paralleled power converters

Abstract

A new current-sharing technique for paralleled power converters, which is based on frequency encoding of the current-sharing information, is introduced. The approach has significant advantages over existing methods, including the ability to transformer isolate or eliminate current-sharing control connections. Operation of the current-sharing technique is analyzed, and the design and experimental evaluation of a three-cell prototype system are presented.

Review of hierarchical control in DC microgrids

“…To address the limitation of the varying voltage level due to line resistances, a small AC signal over the DC signal is injected in a method reported in [37,38]. The frequency of the AC signal acts as a means of communication.…”

Review of control techniques for inverters parallel operation

“…A method of current sharing for paralleled power converters is introduced and then explored in [31][32][33], in this approach, see Fig. 5.…”

Control of input-series and output-independent power converter building block system based on buck converter topology

“…More than ensuring the input voltage sharing of the series connection structures in [14][15][16][17][18][19][20][21] as a stability concern, ISOI configuration has to deliver different amount of power to different modules, which keeps the balanced operation of the battery modules. The lower voltage cell will be charged at higher power while the higher voltage cell will be charged at lower power.…”

“…The control of ISOS connection has been discussed in [19,20,21]. The active sharing of input and output voltage method is proposed in [20] and a natural balancing mechanism is investigated in [21].…”