Battery‐integrated multi‐input step‐up converter for sustainable hybrid energy supply

This study proposes a charging/discharging system of energy storage devices (ESDs) to regulate the voltage of a dc bus. The proposed charging/discharging system is formed by a zeta/sepic converter and a sliding mode controller (SMC). The SMC uses a single sliding surface to regulate the dc bus voltage for the three operating modes of the charger/discharger converter (charging, discharging, and stand-by) and for ESD voltages lower, equal, or higher than the dc bus voltage. This study includes the stability analysis of the SMC and a design procedure of the SMC parameters. The charging/discharging system is simulated in PSIM, where the results confirm that the proposed SMC regulates the bus voltage in charging, discharging, and stand-by modes for different operating points of the system. Finally, the proposed charging/discharging system was constructed for demonstrating the feasibility of the solution for real applications. Moreover, the experimental results obtained in such a platform put into evidence the accuracy of the proposed SMC in regulating the bus voltage in all the possible conditions: bus voltage lower, equal or higher than ESD voltage, and during charge, discharge, and stand-by modes of the ESD.

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“…Replacing (24) into (42), and assuming the same dynamic conditions after transients defined in the previous section…”

Section: Equivalent Control Conditionmentioning

confidence: 99%

Charging/discharging system based on zeta/sepic converter and a sliding mode controller for dc bus voltage regulation

Henao‐Bravo¹,

Saavedra‐Montes

Ramos‐Paja

et al. 2020

IET Power Electronics

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“…Averaging (16) over a switching period and employing the average inductor currents given in (7) and taking the current ripples into account, produces, respectively…”

Section: Continuous Conduction Modementioning

confidence: 99%

“…The voltage‐range of operation might be wide because renewable sources usually generate power at low and variable DC voltage; in the case of PV panels, issues concerned with the voltage gain can be alleviated if configurations of series‐connected panels are employed [4, 7]. This approach can increase the voltage, nevertheless, the MPPT algorithms can be affected under partial shading conditions.…”

Section: Introductionmentioning

confidence: 99%

“…In this case, a power electronics converter is suited for obtaining the required voltage level, therefore some power processors have been already proposed, such as those reported in [1, 2]. In [7] a scheme, suited for renewable energy applications, incorporating battery‐integrated DC–DC converters and derived from the basic power converters, has been proposed. Out of several studies, it can be observed that the concept of multi‐input is taking significant relevance for schemes with more than one renewable power source; this kind of configurations gives the possibility of hybrid microgrids [8].…”

Section: Introductionmentioning

confidence: 99%

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Quadratic buck–boost converter with reduced input current ripple and wide conversion range

García–Vite

Rosas-Caro

Martínez-Salazar

et al. 2019

IET Power Electronics

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This study introduces an advanced DC-DC power converter with two main objectives, (i) to achieve a wide range of voltage gain, which means the converter may work over a wide range of input voltage for a fixed desired output voltage and (ii) to achieve a reduced input current ripple. Those features are highly desired in renewable energy applications, for example with photovoltaic panels and fuel cells. The proposed converter was designed in a structure in which the input voltage is composed by the difference of two inductor currents, the currents through inductors are driven with transistors that may have different duty cycle, this allows the current ripple cancellation. In addition, the structure of the converter provides a quadratic type voltage gain, which leads to a wide range of operation voltage. The converter achieves both the wire range of voltage gain and current ripple cancellation, nonetheless, the buck-boost capability is also provided. The input current ripple reduction helps preserve the renewable energy sources since they suffer deterioration when current with considerable ripple is drawn from them. Dynamic and steady-state analysis are performed along with the components sizing. Simulation and experimental results are provided to demonstrate the principle of the proposition. 2 voltage gain of the QBC G B voltage gain of the conventional boost converter Q j transistor jth with j = 1, 2 D j diode jth with j = 1, p, n C j capacitor jth with j = 1, p, n, o L j inductor jth with j = 1, 2, o v C j instantaneous voltage of the capacitor C j i L j instantaneous current of the inductor L j

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“…On the controller part, most published works are based on small signals, that is linear models of multi-input converters, and consequently, most proposed controllers are linear [43][44][45][46]. A nonlinear control scheme for a two input boost converter was presented in [47]; the controller prevents currents from entering discontinuous conduction mode (DCM).…”

Section: Introductionmentioning

confidence: 99%

Modeling, Design Procedure and Control of a Low-Cost High-Gain Multi-Input Step-Up Converter

et al. 2019

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The use of several different sources to feed a load jointly is convenient in many applications, in particular those where two or more renewable energy sources are employed. These applications include energy harvesting, hybrid vehicles, and off-grid systems. A multi-input converter able to admit sources of different characteristics and select the output power of each source is necessary in such applications. Several topologies of multi-input converters have been proposed to this aim; however, most of them are controlled by simple strategies based on a small signal model of multi-input converters. In this work, a low cost high gain step-up multi-input converter is analyzed. A nonlinear model is derived. Using this model, a detailed design procedure is proposed. A 500 W converter prototype was constructed to confirm that the model predicted the real behavior of the converter. Using the nonlinear model, indirect voltage control of basic converters was extended to the multi-input converter. The obtained controller had a fast performance, and it was robust under load and input voltage variations. With the obtained model, the proposed design procedure, and the controller, a converter that was initially proposed for photovoltaic applications was enabled to be used in a broader range of applications. The herein exposed ideas for modeling, the design procedure, and control could be also applied to other multi-input converters.

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Battery‐integrated multi‐input step‐up converter for sustainable hybrid energy supply

Cited by 14 publications

References 33 publications

Charging/discharging system based on zeta/sepic converter and a sliding mode controller for dc bus voltage regulation

Charging/discharging system based on zeta/sepic converter and a sliding mode controller for dc bus voltage regulation

Quadratic buck–boost converter with reduced input current ripple and wide conversion range

Modeling, Design Procedure and Control of a Low-Cost High-Gain Multi-Input Step-Up Converter

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