New non-linear control strategy for non-isolated DC/DC converter with high voltage ratio

Electric vehicle technology has been adopting fuel cells (FCs) for hybrid applications over the past few years. Therefore, the development of advanced power electronic systems for the integration of fuel cells with on-board energy management is fundamental for achieving high-performance systems. An FC for vehicular applications is usually a low-voltage current-source like device that produces electricity and heat directly from input hydrogen and oxygen. Most often, it is required that the FCs be stacked for high-voltage dc-link in order to supply the input power for the drivetrain and electric motor drive system. The FC has a nonlinear nature, and it must be controlled to operate in the highefficiency operating range. Hybrid electric vehicles have physical constraints such as volume and weight under limited cost and expected lifetime. There is a need for high-voltage input/output ratio of dc-dc boost converters to be connected between the FC to the motor drive dc-link. In addition, it is necessary to have low input ripple at the dc-dc boost converter in order to maximize the FC lifetime, and the traditional dc-dc boost converter topologies have poor performance on these specifications. This paper proposes a new dc-dc converter family of topologies aimed at improving the application to electric vehicle power control. This family is defined as floating-interleaving boost converters (FIBCs). The paper will thoroughly show analysis and experimental verification of FIBC's, and they will be compared with conventional boost converter characteristics. The paper supports how performance figures related to the passive components, i.e., the inductor and capacitor, will have better volume and weight, extremely low input current ripple, and improved efficiency and transfer ratio. The analysis presented in this paper shows how to choose the most suitable topology in order to achieve the desired specifications. The selected topology is fully validated experimentally using advanced nonlinear sliding mode control, which has the additional feature of operating even in faulty conditions. Index Terms-Boost converter, dc-dc converter, fuel cell (FC) hybrid vehicle, sliding mode control. Manuscript

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“…A nonlinear sliding-mode controller is used to generate the required control input for each switch of the four-phase FIBC [25]- [27]. …”

Section: Experimental Validation Of Four-phase Floating Interleamentioning

confidence: 99%

Experimental Validation of High-Voltage-Ratio Low-Input-Current-Ripple Converters for Hybrid Fuel Cell Supercapacitor Systems

Kabalo

Paire

Blunier

et al. 2012

IEEE Trans. Veh. Technol.

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“…Recent approaches to robust control of power converters can be found in [3]- [12]. Nonlinear control concepts such as passivity or flatness are exploited in [3], [7], while [4] present fuzzy controllers which deal with the nonlinearities of the converter. Model predictive methods are shown in [5] while synthesis methods based on optimization algorithms and LMIs are shown in [6], [8]- [12].…”

Section: Introductionmentioning

confidence: 99%

Robust gain-scheduled control of dc-dc converters: An LMI approach

Olalla

Queinnec

Leyva

2011

2011 IEEE International Conference on Control Applications (CCA)

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This paper deals with the modeling of nonlinear and time-varying dc-dc converters in linear parameter variant (LPV) form. Such LPV models are employed to derive synthesis conditions in order to obtain robust gain-scheduled controllers in a systematic form, thanks to a linear convex formulation. The proposed synthesis algorithm allows taking into account uncertainties of the system and common specifications of power converters, such as settling time, overshoot and disturbance rejection. The LPV formulation allows to obtain improved robustness and performance properties, as compared to previous time-invariant synthesis approaches. The results are verified by boost dc-dc converter simulations.

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“…If galvanic isolation is not required, the cascade connection of two boost converters can be a good alternative to obtain high voltage step-up ratios. Some previous works have presented a studies of cascaded converters, such as combination of an interleaved converter and inverter three levels [2], and a comparison between static and dynamic performances of a Z-source converter and dual stage boost converter [3].…”

Section: Introductionmentioning

confidence: 99%

Modeling and control design of a boost converter used with a fuel cell

Moutabir

Abdelmounim

Mohamed

et al. 2014

2014 Second World Conference on Complex Systems (WCCS)

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This paper deals with the synthesis of a cascade of two BOOST converters used with a fuel cell. First, a fuel cell model is presented. Then, a nonlinear model of the whole controlled system is developed and a robust nonlinear controller of currents is synthesized using a backstepping design technique. A formal analysis based on Lyapunov stability and average theory is developed to describe the control currents loops performances. A classical PI controller is used for the voltages loops. The study of the stability of the system will also be discussed. Simulated results are displayed to validate the feasibility and the effectiveness of the proposed strategy.

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New non-linear control strategy for non-isolated DC/DC converter with high voltage ratio

Cited by 37 publications

References 8 publications

Experimental Validation of High-Voltage-Ratio Low-Input-Current-Ripple Converters for Hybrid Fuel Cell Supercapacitor Systems

Experimental Validation of High-Voltage-Ratio Low-Input-Current-Ripple Converters for Hybrid Fuel Cell Supercapacitor Systems

Robust gain-scheduled control of dc-dc converters: An LMI approach

Modeling and control design of a boost converter used with a fuel cell

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