Abstract
The power converters are widely used in several industrial applications where it is necessary to obtain from a fixed voltage another one higher or lower than the original. In this paper, we focus on the DC-DC (direct current) boost converters, where to guarantee the desired voltage, an internal current tracking loop is usually used. However, this tracking cannot be assured in the presence of unknown load changes and external perturbations when traditional controller strategies are implemented. In this paper, an advanced control strategy is proposed to ensure the current tracking using a saturated super-twisting controller on the power converter. The finite-time current tracking of a DC-DC boost converter is assured in the presence of bounded Lipschitz perturbations composed by unknown load changes and exogenous signals. The proposed approach generates a continuous bounded control signal applied to the converter by using a sigma-delta modulator Σ Δ M . The controller gains are tuned to obtain finite-time stabilization of the tracking error, while the control signal remains bounded. To illustrate the effectiveness of the proposed results, the controller is applied to a physical boost converter using the hardware implemented Σ Δ M and an STM32 Discovery development card. Besides, the controller is compared with a first-order sliding mode controller showing that for small sample times, the energy of the error signal is reduced.
Highlights
Introduction e DCDC power converters are used in contemporary applications and have been widely investigated in the last three decades. ey are the ideal candidates in several applications such as electric and hybrid vehicles, fuel cells, microgrids, and photovoltaic and renewable energy storage systems [1,2,3,4,5,6,7]. e natural operation of power converters requires that the control variable takes values from a discrete set
We focus on the DC-DC boost converters, where to guarantee the desired voltage, an internal current tracking loop is usually used
Introduction e DC-DC power converters are used in contemporary applications and have been widely investigated in the last three decades. ey are the ideal candidates in several applications such as electric and hybrid vehicles, fuel cells, microgrids, and photovoltaic and renewable energy storage systems [1,2,3,4,5,6,7]. e natural operation of power converters requires that the control variable takes values from a discrete set
Summary
Under Assumptions 1 and 2, the task is to ensure that the inductor current i tracks the desired inductor current i∗ exactly by using a SSTA controller after a finite transient, i.e., the problem resides on to stabilize in finite-time the current error (12), i(t) ⟶ i∗(t) for all t ≥ tr, where tr is the reaching time, by using a continuous control law u(t). E objective of this paper is the design of a controller that guarantees the finite-time tracking of a desired current in the presence of bounded Lipschitz uncertainties/perturbations An inner current control loop and an outer voltage control loop. e objective of this paper is the design of a controller that guarantees the finite-time tracking of a desired current in the presence of bounded Lipschitz uncertainties/perturbations
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
