A Distributed Control Strategy for Parallel DC-DC Converters

Abstract

This letter addresses the problem of voltage regulation and balanced current sharing in a parallel connection of heterogeneous DC-DC converters sharing a common ZIP (constant impedance, constant current, and constant power) load. To this end, a distributed dynamic control approach is developed. The proposed control approach does not rely on the load profile and the number of active converters. The paper describes theoretical aspects in rigorous Lyapunov-based stability analysis, loadindependent characteristic, scalability, and plug-and-play feature of the control design, and verifies the performance of the proposed control mechanism via simulation case studies in MATLAB/Simscape Electrical environment.

Optimal control allocation for the parallel interconnection of buck converters

“…Non-linearities would be induced in the model and make the problem challenging. Furthermore, for the other control methods, recent results focus on distributed architecture (see [2,37] concerning the droop-control method and [10] for current sharing). The extension of the control strategy of this paper to a distributed architecture is an appealing perspective.…”

“…At the beginning, the system is operating with a load value R = 6 Ω and with the optimal current distribution with respect to J. At t = 5 ms, the first row in the cost function in the optimization problem (10) is replaced by i 2 − σ r so that i 1 is driven to zero. As a matter of fact, this modification implies that all the power required by the load is fed by the second converter.…”

“…Instead of compromising between voltage regulation and current distribution, the so-called balanced current sharing method gives priority to the voltage regulation and ensures an effective control of the output voltage. To this end, this well-known strategy imposes that every converter shares the same fraction of the total current (see [5,6,9,10] for instance). If this strategy seems to be justified when the converters are identical, it is not expected to be optimal when the converters have different characteristics (in particular, in terms of rate of response and efficiency).…”

Optimal Size of a Smart Ultra-Fast Charging Station

“…Since the considered system consists of several modules, the control structure is generally classified as either a centralized control structure or as a distributed control structure. The decentralized structure has the advantage of being more flexible and provides a higher scalability; indeed, it doesn't require a central controller or communications between the modules [19]. Nevertheless, the most suitable control structure depends also on the chosen communication topology.…”

Two-layer nonlinear control of DC-DC buck converters with meshed network topology

“…Although these methods ensure the voltage regulation and guarantee the stability of overall DC networks, they do not consider current regulation/sharing in the network of buck converters. Distributed control approaches for average voltage regulation and proportional current sharing in DC microgrids with DC-DC buck converters have been proposed in Cucuzzella et al (July 2019); ; Sadabadi (Oct. 2021); Trip et al (Jan. 2019); Tucci et al (Sept. 2018). In Guo et al (July 2019,J), overcurrent protection approaches for a single DC-DC buck converter have been proposed.…”