Analysis and control design of paralleled DC/DC converters with current sharing

Abstract

This paper presents a general small-signal stability analysis of paralleled converter systems. The framework specializes to include both the "democratic" and "master-slave" currentsharing schemes. Design examples illustrate how to obtain stable current sharing. We show how paralleled converters can become unstable (even when active current sharing is absent) and discuss the influence of the number of converters paralleled.

Study of cable resistance and remote-sensing scheme in parallel DC/DC converter system via primary droop current-sharing control

“…The first is the suitable cable resistance can improve the stability of the parallel DC/DC converter system [18,19], but it might be harmful to the system efficiency. This is a common mode stability problem because of the interconnection and system impedances, which is different from differential mode stability by current-sharing loop [3]. Another practical design scheme to compensate output cable voltage drop is to use remote feedback sensing method.…”

“…The most prevailing current-sharing control scheme is the active current-sharing control scheme, especially, the master-slave and average current-sharing controls [1 -7]. The literatures [2,3] provide the key theoretical study in the master -slave and average currentsharing controls. The other scheme is droop current-sharing control.…”

An enhanced control approach for dc–dc converters

“…With regard to the literature, linear control techniques are the most common tools for control design of dc-dc converters (for more details, see [1,2], and references therein). However, since dc-dc converters are nonlinear systems with a highly variable parameter (in particular the load), the performance of linear technique is limited and may result in system instability [3][4][5][6]. In order to overcome these limitations, several nonlinear control strategies have been proposed for dc-dc converters [7][8][9][10].…”

Paralleled DC-DC Power Converters Sliding Mode Control with Dual Stages Design

“…The nonlinearities of the DC-DC converters are due to interaction among the converter components and the switching nonlinearity behaviors. However, linearized average model is commonly used for converter analysis [3][4][5][6][7][8][9]. A drawback of the linearized model is that it cannot predict the dynamics of the converter in a saturation region [2].…”