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This paper deals with the voltage regulation of DC micro grid system using photovoltaic and battery coupled single-ended primary-inductor converter (SEPIC) converter. SEPIC converter is a DC-to-DC boost converter, it can produce non pulsating DC current with less ripples when compared to buck and buck boost converters. Non pulsating DC current is the demanding condition required in maximum power point tracking (MPPT) applications and battery charging. This paper presents the simulation of the converters for both open and closed loop systems. Firstly, the proposed PV coupled SEPIC converter and the battery coupled buck boost converters are integrated to regulate the voltage in micro grid, and it is compared with the conventional methods in terms of output voltage, ripple voltage and power. The ripple voltage has been reduced to 0.1 V from 0.3 V in the proposed method. Secondly, PI and PID controllers are employed individually to SEPIC and buck boost converter for the voltage regulation of the DC micro grid system. The performance of the closed loop analysis is done in terms of time domain specifications, and it reveals that PID controller has the better response. The proposed system is simulated using MATLAB/Simulink and the prototype has been developed to verify the simulated results.

This paper discusses the efficiency of two power electronic converters connected in cascade in aim to generate the maximum power from the fuel cell and regulate the load voltage under different working conditions and load variations. The first converter is an interleaved boost proposed to minimize the fuel cell voltage ripples and determine the optimum duty cycle to generate the maximum of power. Thereafter, the control of this converter is performed through a Maximum Power Point Tracking approach. To meet the load requirements in terms of voltage regulation, a buck boost converter controlled with a Proportional Integral controller is proposed. This configuration allows generating the optimal power and regulating the load voltage at the same time. The both converters are simulated under Matlab-Simulink to validate the robustness and the efficiency of this new design. Obtained results show the robustness of the new design approach and efficiency improvement of the system.

Virtual instrumentation is defined as the combination of measurement and control the hardware and software with industry-standard computer technology to create user-defined instrumentation systems. In this paper, the two-input fuzzy logic controller (FLC) for buck boost converter output-voltage regulation is proposed by using LabVIEW. Here the output voltage has been used as a closed loop feedback to determine the output error (e) and the change in error (Δe) as two inputs to the controller. The elements of the buck boost converter as inductance and capacitor have been selected to insure continuous operating mode (CCM) and low output voltage ripple. The experimental results show that the FLC has a good output voltage response compared with PID controller response. This research has successfully showed that LabVIEW and Fuzzy Logic controller can be applied to develop a system for selecting the modes of controller.

To optimize the performance of energy storage system triple input converter is proposed, the topology is simulated in MATLAB/ Simulink environment. The simulation work is performed with three different input sources, one is solar photo voltaic source and another is battery storage system and yet another is UC bank. The converter is operated with continuous conduction first in buck mode, then in boost mode and finally in buck-boost mode and entire results are analyzed under steady state conditions. Independent switching scheme is used for the generation of the gate pulses to the converter switches. The simulation results of switching pulses, voltage appearing across inductor, current through inductor, voltage appearing across load, and current through load for converter operation in buck mode, then in boost mode and finally, buck- boost mode of operations with converter are presented.

Recently, the circuitry of Multilevel Buck-Boost Converter (here, called MBBC1) is suggested in the literature to attain high inverting voltage by increasing the output levels of the classical buck-boost converter. However, the only circuitry is suggested and detail investigations are not provided. The major drawbacks of MBBC1 are the voltages across the load capacitors side are unequal and the input current is not continuous. Therefore, the MBBC1 is not well suited to feed multilevel inverter where a stack of capacitors is required with equal voltage across each capacitor. A new modified MBBC called MBBC2 is proposed to achieve continuous input current and equal voltage across each capacitor. The circuitry of MBBC1 and MBBC2 configurations are analysed with non-idealities to investigate its effects on the voltage conversion ratio. The Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM) boundary conditions and modes of operation for MBBC1 and MBBC2 configurations are presented. The procedure for basics design and components selection is elaborated. Additionally, comparison of MBBC1, MBBC2 and recently proposed a non-isolated DC-DC configuration is provided. The performances of MBBC1 and MBBC2 configurations are tested with simulation and experimental work, and obtained results consistently show a good agreement with the theoretical approach. - The Institution of Engineering and Technology 2019. This publication was made possible by NPRP grant no. [X-033-2-007] from the Qatar National Research Fund (a member of Qatar Foundation). The statements made herein are solely the responsibility of the authors. Scopus

A novel buck-boost dc-dc converter with high voltage step-up and step-down ability has been introduced in this paper. There are two switches in this converter, of which the sources are connected together and also connected to the ground of the input voltage source. Hence, there is no need for floating gate driver. In addition, the voltage stress of one of the switches is lower than the existing quadratic buck-boost converters. Performance of the analytical results is validated using both simulation in MATLAB/SIMULINK and experimental tests where the proposed converter is evaluated in both buck and boost modes.

U ovom radu razrađen je matematički model silazno uzlaznog istosmjernog istosmjernog pretvarača za kontinuirani režim rada. Izveden je nelinearni model pretvarača s trenutačnim vrijednostima struja i napona, koji je poslužio kao osnova za simulacijski model za Matlab/Simulink programski paket. Iz matematičkog modela s trenutačnim vrijednostima izveden je usrednjeni model za kontinuirani režim rada, a linearizacijom je određen linearni model i upravljačka prijenosna funkcija. U nastavku rada određen je PI regulator izlaznog napona, Z-N metodom, čiji su parametri korigirani temeljem analize simulacijskih odziva kako bi se dobilo željeno ponašanje u odabranoj radnoj točci i stabilno ponašanje u cijelom radnom području. Djelovanje pretvarača i regulatora provjereno je simulacijom u Matlab/Simulink programskom okruženju. Mathematical model for a buck-boost DC-DC converter for continuous operation is developed in this paper. Nonlinear converter model with instant values of electricity and voltage is realised and served as a base for simulation model used within Matlab/Simulink software. Average model for continuous operation is derived from mathematical model with instant values. Linear model and control transmission function are defined using linearization. Within this paper, PI regulator of output voltage was defined using Z-N method. Its parameters were corrected based on analysis of simulation responses so wanted behavior in defined work point and stabil behavior in the whole work field was obtained. Converter and regulator were tested using Matlab/Simulink simulation.

This paper proposes a Fuzzy Sliding Mode Control (FSMC) as a control strategy for Buck-Boost DC-DC converter. The proposed fuzzy controller specifies changes in the control signal based on the knowledge of the surface and the surface change to satisfy the sliding mode stability and attraction conditions. The performances of the proposed fuzzy sliding controller are compared to those obtained by a classical sliding mode controller. The satisfactory simulation results show the efficiency of the proposed control law which reduces the chattering phenomenon. Moreover, the obtained results prove the robustness of the proposed control law against variation of the load resistance and the input voltage of the studied converter., {"references":["M. H. Rashid, Power electronics handbook, 2nd ed. Academic Press,\n1998.","R.D. Middlebrook and S. Cuk, A General Unified Approach to Modelling\nSwitching Power Stages, IEEE Power Electronics Specialists Conference\nRec., pp. 18-34, 1976.","M. Ahmed, M. Kuisma, K. Tolsa and P. Silventoinen, Standard procedure\nfor modelling the basic three converters (Buck, Boost, and Buck-boost)\nwith PID algorithm applied, Proceedings of the 13th International Symposium\non Electrical Apparatus and Technologies (SIELA), Plovdive, May\n2003.","H. ElFadil, F. Giri and H. Ouadi, Reducing Chattering Phenomenon in\nSliding Mode Control of Buck-Boost Power Converters, IEEE International\nSymposium on Industrial Electronics, 2008.","S.C. Tan, Y.M. Lai and C.K. Tse, A fixed frequency pulse width modulation\nbased quasi sliding mode controller for buck converter, IEEE\nTransactions on Power Electronics, Vol. 20, No. 6, pp. 1379-1392,\nNovember 2005.","S.C. Tan, Y.M. Lai and C.K. Tse, A unified approach to the design of\nPWM based sliding mode voltage controllers for basic DC-DC converters\nin continuous conduction mode, IEEE Transactions on Circuits and\nSystems I, Vol. 53, No. 8, pp.1816-1827, August 2006.","C.K. Tse and K.M. Adams, Quasi-linear analysis and control of DC-DC\nconverters, IEEE Transactions on Power Electronics, Vol. 7 No. 2, pp.\n315-323, April 1992.","X.F. Zhong, G.J. Ye, N.H. Chen and J.L. Jiang, Study on sliding-mode\ncontrol in three-level converters, The 4th International Power Electronics\nand Motion Control Conference, 2004. IPEMC 2004, Vol 3, Issue 2, pp.\n1105 - 1110, August 2004.","V.M. Nguyen and C.Q. Lee, Indirect implementations of sliding-mode\ncontrol law in buck-type converters, Proceedings of the IEEE Applied\nPower Electronics Conference and Exposition (APEC), Vol.1, pp.111-\n115, March 1996.\n[10] A. Kandel and L. Gideon, Fuzzy control systems, CRC Press. New York,\n2000.\n[11] M.K. Passino, Fuzzy control, Addison-Wesley. London, 2000."]}