Improved static and dynamic performances of a two‐cell DC–DC buck converter using a digital dynamic time‐delayed control

Abstract

SUMMARYMulti-cell converters have been developed to overcome shortcomings in usual switching devices. The control system in these circuits is twofold: first, to balance voltages of the switches and second to regulate the load current to a desired value. However, with a purely proportional controller, the system presents a static error. With a PI controller the static error is annihilated, but at the expense of shortening the stability region and increasing settling time. In this work, a zero static error dynamic controller for a two-cell DC-DC buck converter is designed. To achieve zero current error, we propose a generalized scheme of a dynamic controller. Then, using nonlinear analysis and Lyapunov stability theory and bifurcation prediction tools, we prove that zero static error is achieved. The proposed controller outperforms the PI controller in terms of settling time in the presence of saturating effect during the start-up transients. Numerical simulations in the form of time domain waveforms and bifurcation diagrams from switched circuit-based model are presented to confirm our theoretical results.

Optimal control of a single‐phase H‐bridge DC–AC inverter

“…To overcome these limitations, some improvements of the linear techniques have been suggested. The time-delayed feedback controller is another method that has been widely used in conjunction with the proportional controller in order to improve the DC-DC converter behavior [18][19][20] as well as the H-bridge inverter [21][22][23]. The time-delayed feedback controller is another method that has been widely used in conjunction with the proportional controller in order to improve the DC-DC converter behavior [18][19][20] as well as the H-bridge inverter [21][22][23].…”

Quasi-Periodicity, Chaos and Coexistence in the Time Delay Controlled Two-Cell DC–DC Buck Converter

“…In [Robert & El Aroudi, 2006], authors have shown that the proportional controller based PWM control signal leads to chaotic behavior in the multicell converter when the gain is raised beyond a critical value. To improve its performance, some new controller schemes have been proposed to control the two-cell buck converter Hamza et al, 2011;Kaoubaâ et al, 2012]. Nevertheless, a chaotic behavior still exists outside a stability region.…”

A module‐integrated isolated solar micro‐inverter without electrolytic capacitors

“…PV energy systems are being extensively studied because of its benefits of environmental friendly and renewable characteristics [1][2][3][4]. Green energy offering the promise of clean and abundant energy gathered from self-renewing sources such as solar energy, geothermal energy and wind source are broadly developed.…”