Study on sliding-mode control in three-level converters
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Sliding-mode control has such advantages as robustness, simple algorithm and good dynamic performance, so sliding-mode control was introduced into three-level (TL) converters in this paper. The design of sliding-mode control buck TL converter, including sliding-mode control surface design, equivalent control, stability and existence proof, was given as an example. Experiments of sliding-mode control buck TL converter and traditional PWM buck TL converter were carried out in order to analyze and compare. Analysis results verify that dynamic performance and robustness are improved greatly in the sliding-mode control buck TL converter compare with traditional PWM buck TL converter.Keywords:
Robustness
Buck converter
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The modelling and adaptive sliding-mode control of a high-order buck-boost converter is presented. The converter gives a high voltage gain and presents low current stress on its circuit components. The full-order model of the converter is derived by using a combination of the averaged state-space modeling approach and a duty ratio constraint deriving method. An adaptive sliding-mode controller for this converter is then proposed in which the adaptive law calculates the estimated load conductance to generate the required sliding surface. The stability analysis of the adaptive sliding-mode controlled system is performed. In addition, experimental results comparing the performance of the proposed adaptive sliding-mode controller with that of an existing robust sliding-mode controller are provided to present the advantages.
Buck converter
Duty cycle
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The primary goal of research in this Ph.D. dissertation is to investigate the possibilities of
application of modern control methods in controlling the output voltage of the DC-DC
converters (buck, boost) in order to ensure the system robustness to the input voltage and load
variations. This dissertation deals with the analysis and application of sliding mode control
algorithms in the synthesis of these converters in order to improve the properties of existing
converters and to modify them, as well as to adjust and tune the digital sliding mode controls
based on the input-output plant model to be applicable in these converters.
The design procedure is based on the converter models given in the form of discrete transfer
functions. The proposed control for converters is a combination of the digital sliding mode
control and (generalized) minimum variance control techniques. The problem caused by an
unstable zero of the boost converter, which prevents the direct control of the output voltage of
this converter, has been overcome by introducing the generalized minimum variance control.
Also, only the output voltage of converter must be measured for the realization of the proposed
control, so there is no need for an additional current sensor. This dissertation includes the
modification of the developed algorithms with the aim of applying them to low-cost, standard 8-
bit microcontrollers.
Finally, the efficiency of the proposed solutions is verified by digital simulation and a series
of experiments on the laboratory developed prototypes of both converters, as well as by their
comparative analysis. The satisfactory experimental results are obtained regarding the typical
characteristics of the converters.
Robustness
Digital Control
Buck converter
Realization (probability)
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In this paper, a novel adaptive delta modulation (ADM) control scheme is proposed as a driver for an interleaved DC/DC power converter, analysis of the converter is carried out in order to achieve the required system stability and to improve the dynamic performance. The output response characteristics obtained by this method is very much improved compared to the conventional methods. The proposed adaptive control scheme is verified on a 42V/14V interleaved DC/DC synchronous buck converter system. Simulation results are presented to illustrate the advantages of the proposed method. The performance of the DC/DC converter system with ADM control loop provides a number of features that do not exist in today's electrical systems like very vast response. the simulation results are presented to fully demonstrate the theoretical analysis and the performance comparison of response between PWM with PID controller, simplified sigma delta modulation (SDM) control loop and the proposed ADM control loop.
Buck converter
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This paper deals with the switching design for two cells converter. With a systematic manner and a geometric analysis, we developed a novel switching surfaces using the sliding mode control theory. The limit cycle of the converter is taken in consideration in the control design phase. The proposed control scheme combines the performances of PWM control techniques (optimal steady state) and the advantages of the direct control strategies (control of the transitory state). This is validated through simulation under fast variations of the input voltage.
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Three-phase
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Abstract — The Power Electronic Converters (PEC) system is used in the modeling of switching power converters that have various control methodologies including linear control and non-linear control. One of the PEC systems is the Buck Converter which has the main task of controlling the output voltage / load. Buck Converter has the main problem in switching control. Switch control on Buck Converter uses high frequency which can damage components and MOSFET switch on Buck Converter. The voltage regulation of a DC - DC switching converter based on Pulse Width Modulation (PWM) that uses frequency domain control techniques and uses a small average converter signal model. The switching process that uses high frequency produces chattering which results in instability in the system. This paper presents modified sliding mode controller by testing the Relay Feedback control system in the application of Sliding Mode Control (SMC) to improve the performance of the Buck Converter control response. An analysis and simulation by schematic diagram of relay feedback was performed in this work. The purpose is to find the best control parameter by design of relay feedback. Research results shown that proposed work has good performance according to the pre-determined control specifications. Keywords—buck converter; sliding mode control; pulse width modulation; relay feedback
Buck converter
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The DC-DC converters are well-known due to their nonlinear and time-variant nature. This paper addresses the investigation of a fixed frequency pulse width modulation (PWM) based sliding mode current controller applied to quadratic buck converter (QBC). The QBC is well-suited for very low voltage central processing unit (CPU) voltage regulator applications with high-step-down DC-DC conversion ratios. The sliding mode current control features the reference current profile generation, satisfaction of hitting, existence and stability conditions besides the selection of sliding surface parameters. The simulation of QBC is realised for 19 V~8 V/1V at 50 KHz using PSIM software. The experimental results are presented in order to validate the simulation results. The strength of this control strategy is analysed for both line and load regulations.
Buck converter
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The switched-mode power supplies are widely used in very low voltage and high-power applications where large conversion ratios are required. In such cases, the quadratic buck converter is the suitable one compared to buck, cascaded buck and multi-phase choppers, because of their limitations in switching frequency and losses. This paper presents mathematical analysis, design and simulation of a quadratic buck converter using fixed frequency Pulse-Width Modulation (PWM)-based Sliding-Mode (SM) controller in order to obtain fast dynamic performance. The design aspects include choice of sliding surface, deriving existing and stability conditions, control parameter selection and their analysis. The performance of the proposed converter is compared with the conventional Average Current-Mode (ACM) controller. In average current mode, the tuning of the PI controller for the inner current loop and outer voltage loop is done using bode plots. The simulation results for the two types of controllers are represented for analysing dynamic performance, as well as line and load regulations.
Buck converter
Bode plot
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The purpose of this paper is to comment on the reference voltage tracking ability of a recently proposed state observer based adaptive sliding mode control for boost converters. It is shown that the control in the cited paper cannot track the reference voltage. A modified control law that enables reference voltage tracking while preserving the other advantages of the commented paper is proposed and validated by simulation and experimentation on laboratory hardware.
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Control of Buck converter is a complex task due to the nonlinearity in the converter that are introduced by the external changes. This paper presents a systematic, simple and easy to follow design procedure for sliding mode voltage controlled buck converters operating in discontinuous conduction mode. The dynamic equations much essential in describing the buck converter are represented in a lucid manner. The modelled and simulated version of the sliding mode controller is presented here in this paper. Pulse width modulated (PWM) signal generated by sliding mode voltage controller (SMVC) using appropriate feedback has been successfully utilized to obtain improved performance of the converter. The paper focuses on modelling of a control circuit in Matlab/Simulink.
Buck converter
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This paper presents a novel dual mode control scheme to enhance the performance of the synchronous buck converter (SBC). The SBC with this novel control strategy is capable of operating satisfactorily in continuous and discontinuous mode under different loading conditions. The proposed control scheme employs a new switching technique termed quasi-resonant valley to turn on switches when operating in discontinuous mode. The proposed control scheme with the switching technique also ensures zero voltage switching without any auxiliary devices. It also improves the efficiency when compared with the conventional pulse width modulation control scheme. It is also promising with the view point of low cost and built-in integrated circuits. The MatLAb simulation results offer useful information to obtain the desired output under different modes of operation. Experimental results are also provided to validate the simulation results.
Buck converter
Mode (computer interface)
Dual mode
Modulation (music)
Operating point
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