Examinando por Materia "Sliding-mode control"
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- PublicaciónSólo datosComparison of quadratic boost topologies operating under sliding-mode control(2013 Brazilian Power Electronics Conference, 2013-10-31) Lopez-Santos, Oswaldo; Martínez-Salamero, Luis; García, Germain; Valderrama-Blavi, Hugo; Sierra-Polanco, TomásThe recent development of dual-stage photovoltaic micro-inverters motivates the study of DC-DC converter topologies with high-gain capabilities. Following this idea, a comparison of both static and dynamic performances of the known quadratic boost converter topologies is tackled in this paper. To achieve an accurate comparison, we use the same electronic components and the same control scheme. Considering its advantages, a sliding-mode control law has been proposed to reach a stable equilibrium point in the switching converters. The sliding surface uses only the input current following a constant reference. This current reference is adjusted to obtain an output voltage of 400 V for an input voltage between 15 and 25 V and an output power between 20 and 120 W. The local stability of the proposed control law is tested by using the Routh-Hurwitz criteria. The comparison is accomplished using simulation results to disclose the best configuration in terms of efficiency, dynamic response and applicability in photovoltaic generation.
- PublicaciónSólo datosControl of a Bidirectional Cûk Converter Providing Charge/Discharge of a Battery Array Integrated in DC Buses of Microgrids(Applied Computer Sciences in Engineering, 2017-10-01) López-Santos, Oswaldo; Zambrano-Prada, David; Aldana-Rodríguez, Yeison A.; Esquivel-Cabeza, Harold A.This paper presents a proposal to charge and discharge valve-regulated lead-acid (VRLA) battery arrays integrated into microgrids by using the bidirectional Cûk converter with a multi-mode multi-loop control scheme based on sliding-mode control. The proposed control integrates the constant current - constant voltage - constant voltage charge method (CC-CV-CV) which is implemented using an inner current loop based on the sliding mode control of the input current of the converter and two nested outer loops based on the voltage and current of the battery. Conversely, the discharge is studied using two operational modes, one using a current reference given by a high level on a hierarchical structure and other using a current reference given by an outer Proportional-Integral (PI) controller regulating the voltage of the DC bus. The modelling of the bidirectional Cûk converter in these applications and its operational modes besides the analysis of the inner loop and the design criteria used in the synthesis of the outer loops are addressed. Simulation results are presented validating the control proposal.
- PublicaciónSólo datosDigitally implemented sliding-mode control of a single-phase dual-boost PFC rectifier(2013 Workshop on Power Electronics and Power Quality Applications (PEPQA), 2013-09-30) Lopez-Santos, Oswaldo; Barrero, Jhon M.The digital implementation of a sliding-mode based control for a dual-boost rectifier with power factor correction (PFC) is presented in this paper. The proposed scheme has a current controller tracking a pure sine-wave reference, whose amplitude is a function of the output voltage error affected by proportional and integral terms. Thus, both power factor correction and output voltage regulation are simultaneously achieved. The performance of the overall converter was verified using MATLAB-based simulations and experimental results in a 120 W prototype, obtaining an unitary power factor and a total harmonic distortion (THD) below 3%.
- PublicaciónSólo datosSliding Mode Control of the Isolated Bridgeless SEPIC High Power Factor Rectifier Interfacing an AC Source with a LVDC Distribution Bus(Energies, 2019-09-07) López-Santos, Oswaldo; Cabeza-Cabeza, Alejandro J.; García, Germain; Martinez-Salamero, LuisThis paper deals with the analysis and design of a sliding mode-based controller to obtain high power factor (HPF) in the bridgeless isolated version of the single ended primary inductor converter (SEPIC) operating as a single-phase rectifier. In the work reported here, the converter is used as a unidirectional isolated interface between an AC source and a low voltage direct current (LVDC) distribution bus. The sliding-mode control is used to ensure the tracking of a high quality current reference at the input side, which is obtained from a sine waveform generator synchronized with the grid. The feasibility of the proposal is validated using simulation and experimental results, both of them confirming a reliable operation and showing good static and dynamic performances.
- PublicaciónSólo datosSliding-mode control of a transformer-less dual-stage grid-connected photovoltaic micro-inverter(10th International Multi-Conferences on Systems, Signals & Devices 2013 (SSD13), 2013-09-02) Lopez-Santos, Oswaldo; Martínez-Salamero, Luis; García, Germain; Valderrama-Blavi, HugoA transformer-less topology of a grid-connected photovoltaic micro-inverter applying sliding-mode control is discussed in this paper. The proposed structure is a dual-stage topology with a quadratic boost converter in the DC-DC stage and a full-bridge inverter in the DC-AC stage. The quadratic boost uses a multi-loop scheme with a sliding-mode current controller and a proportional-integral (PI) compensator regulating the output voltage. The full-bridge inverter injects real power to the grid by means of a sinusoidal reference sliding-mode tracking-loop whose amplitude is defined by a maximum power point tracker (MPPT). This preliminary work involves an analytical discussion and several simulation results of each converter and of the overall system.
- PublicaciónSólo datosSliding-mode indirect control of the quadratic boost converter operating in continuous conduction mode or discontinuous conduction mode(2012 IEEE 4th Colombian Workshop on Circuits and Systems (CWCAS), 2013-01-11) Lopez-Santos, Oswaldo; García, Germain; Martínez-Salamero, Luis; Valderrama-Blavi, HugoThis paper presents the analysis of the quadratic boost converter operating in sliding-mode control in order to obtain high DC-gain. This approach uses a indirect control of the output voltage based on the use of a sliding surface defined with the input inductor current. The control law is argued through a stability test. The proposed control was implemented in MATLAB simulations with a quadratic boost operating in continuous conduction mode (CCM), and another one in discontinuous conduction mode (DCM). The results validate the theoretical approach and illustrate the advantages and drawbacks of two operational modes.