A Unified Multimode Control of a DC–DC Interlinking Converter Integrated into a Hybrid Microgrid

López-Santos, Oswaldo; Aldana-Rodríguez, Yeison Alejandro; García, Germain; Martínez-Salamero, L.

doi:10.3390/electronics8111314

Cited by 5 publications

(3 citation statements)

References 36 publications

(49 reference statements)

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“…As a matter of fact, the electrical architecture of all those systems is composed by DC-buses with different voltage levels and degrees of regulation, in which DC-DC converters are the key elements for the required power processing. The latter usually involves specifications regarding high-quality power performance, high conversion range, fast dynamic response and robustness [9]. In this context, DC-DC switching converters with high conversion ratio have been recently used in efficient lighting and micro-inverter design [10]- [12].…”

Section: Introductionmentioning

confidence: 99%

Sliding-Mode Control of a Quadratic Buck Converter With Constant Power Load

et al. 2022

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This paper analyzes for the first time a two-loop sliding-mode control (SMC) of a high-order converter supplying a constant power load (CPL). The converter is a single-switch quadratic buck structure (QBC) interfacing a domestic 380 V DC bus to a CPL requiring a regulated voltage of 48 V DC. The converter is unstable in the absence of control and even after the insertion of an inner loop based on SMC of the input inductor current. The addition of an appropriate linear outer loop establishing the reference to the inner loop stabilizes the system and provides output voltage regulation. The regulated QBC shows a fast recovery of the output voltage with negligible overshoot in response to step-type changes of the output power or the input voltage. It is also shown that the implemented regulator for CPL supply can be used directly in the case of a constant current load (CCL) or a constant resistance load (CRL) resulting in similar performance to the CPL case. PSIM simulations and experimental results in a 400 W prototype are in good agreement with theoretical predictions.INDEX TERMS High-order converters with constant power load, buck quadratic converter, sliding-mode control.

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Section: Introductionmentioning

confidence: 99%

Sliding-Mode Control of a Quadratic Buck Converter With Constant Power Load

et al. 2022

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“…Although other double-series unidirectional capacitor topologies were presented in [12], the configuration used in this paper requires only two switches, can be expanded for bidirectional usage (adding two more switches), and provides significant voltage gain from moderate duty cycles, thus reducing conduction losses. Related topologies and their characteristics were also presented in a review [13] and in the literary works of [14][15][16][17]; however, none of the above include the dynamic analysis of the topology used in this paper, and, nowadays, knowing power converters' properties-such as their controllability and stability in closed-and open-loop conditions-is indispensable.…”

Section: Introductionmentioning

confidence: 99%

Polytopic Robust Stability for a Dual-Capacitor Boost Converter in Symmetric and Non-Symmetric Configurations

Licea

2022

Symmetry

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The step-up power electronic converter, which is easily implemented with two symmetric parallel-boost stages, has recently been proposed in the literature, showing considerable voltage gains with no excessive duty cycle, thus minimizing heat and other adverse effects. Its other advantages are floating-output voltage and increased power density because of the diminution of the capacitors’ voltage rating. In this paper, the Lyapunov-based robust stability of a converter operating in both closed- and open-loop is proved, showing its versatility even during the variation of parameters, which nullifies the symmetry of the converter. Simulation and experimental data allow the corroboration of the analysis.

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“…However, DC microgrids have some advantages when facing DC output sources, such as photovoltaic or energy storage elements [1]. The connection of energy storage elements or interlinking between DC buses [2] is accomplished by DC-DC bidirectional topologies, such as the half-bridge converter (or bidirectional buck-boost converter) [3], which is the simplest topology to fulfill the requirements. In order to ensure stable and well-performing control of microgrids, these converters usually regulate the DC bus voltage with droop strategies [4], [5].…”

Section: Introductionmentioning

confidence: 99%

Output Capacitance Minimization for Converters in DC Microgrids via Multi-Objective Tuning of Droop-Based Controllers

et al. 2020

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This paper proposes a controller tuning methodology for voltage-current droop-based DC-DC converters in DC microgrids to reduce the output capacitance. This minimization is cost saving and implies lower fault currents. However, it leads to higher DC voltage variability during load transients, which requires an output impedance shaping by control means to reduce over or undershoot. The proposed control structure and problem definition simultaneously takes into account that the solution must achieve the impedance shaping, performance and stand-alone stability objectives. This comprises a multi-objective problem which is effectively formulated here and, then, solved by a non-smooth H ∞ optimization technique that tunes all free parameters. For comparison purposes, this tuning methodology is applied to several droop proposals, and the proposed droop is able to reduce the output capacitance of bidirectional buck-type and boost-type half-bridge converters by 37.5% and 23.08%, respectively, with respect to previous proposals. The designs are validated in time and frequency domains by means of theoretical analysis and experimental results on DC microgrid prototypes with bidirectional buck-type or boost-type half-bridge converters.INDEX TERMS DC-DC power conversion, DC microgrids, Multi-objective tuning, H-infinity control, Impedance shaping.

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A Unified Multimode Control of a DC–DC Interlinking Converter Integrated into a Hybrid Microgrid

Cited by 5 publications

References 36 publications

Sliding-Mode Control of a Quadratic Buck Converter With Constant Power Load

Sliding-Mode Control of a Quadratic Buck Converter With Constant Power Load

Polytopic Robust Stability for a Dual-Capacitor Boost Converter in Symmetric and Non-Symmetric Configurations

Output Capacitance Minimization for Converters in DC Microgrids via Multi-Objective Tuning of Droop-Based Controllers

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