Super Lift Luo Converter Research Articles

Improving the design of super-lift Luo converter using hybrid switching capacitor-inductor cell for PV system

<p>In this article, an improvement to the positive output super-lift Luo converter (POSLC) has been proposed to get high gain at a low duty cycle. Also, reduce the stress on the switch and diodes, reduce the current through the inductors to reduce loss, and increase efficiency. Using a hybrid switch unit composed of four inductors and two capacitors it is replaced by the main inductor in the elementary circuit. It’s charged in parallel with the same input voltage and discharged in series. The output voltage is increased according to the number of components. The gain equation is modeled. The boundary condition between Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM) has been derived. Passive components are designed to get high output voltage (8 times at D=0.5) and low ripple about (0.004). The circuit is simulated and analyzed using MATLAB/Simulink. Maximum power point tracker (MPPT) controls the converter to provide the most interest from solar energy.</p>

Control and Automation of Hybrid Renewable Energy Harvesting System

The hybrid renewable energy harvesting and grid integration system has been proposed and validated in this work. The proposed system uses a Wind Energy Conversion System (WECS) and a Solar Photo Voltaic Energy Conversion System (SPVECS). The WECS uses Permanent Magnet Synchronous Generator (PMSG) driven by a wind turbine. The variable frequency and variable voltage output of PMSG is rectified by Diode Bridge Rectifier (DBR) and stepped up by Super Lift Luo Converter (SLLC 1), and finally, the harvested wind energy is delivered to the Direct Current (DC) link of a Distributed Static Synchronous Compensator (DSTATCOM). Further, SPV energy is harvested by using PV modules and voltage is stepped up by another SLLC (SSLC 2), and the harvested PV energy is brought to the DC link of DSTATCOM. The DSTATCOM extends real and reactive power support to the load. The various subsystems of the proposed system have been modelled in Matrix Laboratory (MATLAB) Simulink environment and analyzed their performance.

A Power Converter Based on the Combination of Cuk and Positive Output Super Lift Lou Converters: Circuit Analysis, Simulation and Experimental Validation

This paper has proposed a novel transformerless high gain DC-DC converter. The combination of the Cuk and positive output super lift Luo converter (POSLL converter) has formed the topology of the recommended topology. The continuous input current, the low normalized value of the current/voltage stresses of the semiconductors, the low dimension of the topology due to less stored energy, the common ground point of the input/output terminals, and the high efficiency besides the high voltage gain are the bold features of the proposed topology that makes it suitable for applying in renewable applications and High-intensity discharge lamps (HID). Such a topology has been designed for a continuous conduction mode. However, the function of the converter has been explained in both continuous/discontinuous conduction modes (CCM/DCM). The governing equations of both ideal/non-ideal states have been reported. Moreover, the recommended topology with the recently suggested high gain topologies has been compared in both the ideal/non-ideal modes. The simulation and experimental outcomes have been reported at the end of this study. The simulation in PLECS and experiments on a 120 W prototype have led to substantial results that confirm the validity and applicability of the theoretical analysis on the proposed converter.

Step-Up DC-DC Switching Converter With Single Switch and Multi-Outputs Based on Luo Topology

In this paper, a step-up DC-DC multi-output converter is introduced by integrating a super-lift Luo converter, flyback topology, and coupled inductor concept. The proposed multi-output converter has positive output super-lift structure while simultaneously generating step-up voltages in its outputs. The proposed step-up converter has two non-isolated and one isolated output with a simple structure using one switch and one magnetic core. There is no voltage spike by the leakage inductance of the coupled inductor across the switch in the proposed converter. Therefore, the switch has low-stress voltage. The energy in the leakage inductor is recycled leading to higher efficiency in comparison to similar converters with the coupled inductor. The operating principles and the characteristics of the proposed converter are analyzed and discussed. The experimental results of 110W prototype verify the theoretical analysis and the benefits of the proposed converter in comparison to similar multi-output converters. The conducted electromagnetic interference evaluation of the proposed converter is presented and it is reduced using a common-mode choke.

Solar power based positive output super-lift Luo converter using fuzzy logic controller

Photovoltaic (PV) power generation is employed to meet the increasing demand for energy and of cleaner form. Though renewable and high energy using PV can be produced, they have certain disadvantages. PV cells have a low voltage (approx. 0.5V) rating and they have to be connected in series when higher voltage is required. These cells when connected in series should have identical electrical characteristics to avoid ripples in the output voltage and current, but it is not possible practically. To avoid this miss-match, converter circuits are employed. The major drawbacks in most power converters are reduced voltage gain and their tendency to generate harmonics in the supply system and the load circuit. To overcome these limitations, a positive output super-lift Luo converter is designed. A Positive Output Super Lift Luo converter (POSLC) is a powerful DC-DC converter where the voltage is converted from positive source voltage to positive load voltage as it produces positive voltages of comparatively higher ranges than those of conventional types. The super-lift technique also overcomes the effect of parasitic elements and thus minimizing the ripples in the output voltage and current. In addition to this, the voltage build-up can be achieved by implementing the super-lift technique where the output voltage rises in geometric progression with increased voltage transfer gain and high power density. In this paper fuzzy control is used to produce better-controlled voltage and a more refined output. The performance of POSLC with and without implementation of fuzzy control has been successfully simulated and verified using MATLAB/SIMULINK as well simulation model also developed and analyzed with Proteus package.

WITHDRAWN: Double Integral controller parameters for simulation analysis of the POESLLC in superlift LUO converter

Abstract In this research paper the output voltage, analysis, design, and inductor current regulations ripples in enhancing the model of super lift Luo-Converter working under continuous conduction mode using linear quadratic regulator plus proportional double integral controller is proposed. Here the time variations switching performance super lift Luo- Converter and its dynamic characteristics becomes highly complex. In order to enhance the dynamic characteristics, this converter has offered parameters variation, in output voltage and inductor regulations. This super lift Luo-Converter is analyzed for PV system based on the energy sources. The controller parameters of Linear Quadratic Regulator are designed using the reduced order model of positive output elementary super lift Luo-Converter and its Proportional Double Integral Controller parameters are derived by Ziegler-Nichols tuning method. The performance of the Linear Quadratic Regulator plus Proportional Double Integral Controller is verified at different operating conditions for both developing the MATAB/Simulink model in comparisons with Linear Quadratic Regulator plus proportional integral controller. In the simulation results it shows that output voltage in the designed controller and inductor current regulations are produced under various operating regions.

Implementation of Double Loop Controller Tuned Super Lift Luo Converter and Unipolar Inverter for Solar Fed Grid Application

The main objective of this article gives detail about the solar power conditioning system to make the PV power generation with high power quality before it is connected to the grid. The PV side DC-DC conversion is done by Positive Output Elementary Super Lift Luo converter (POESLLC) with high voltage conversion ratio for better performance. The grid side AC conversion is done by simply double loop controller is introduced in this system to keep less variation and to maintain the grid voltage constant for line and load variations. DC power received from the solar panel is stabilized in the POESLLC converter with double loop controller which consists of PI controller on the outer loop and hysteresis current controller inner loop. Open-loop Pulse Width Modulation (PWM) based unipolar full-bridge inverter is used to maintain the grid parameters to meet the power quality issues. This system avoids the closed-loop controller for inverter and also omits the Maximum Power Point Tracking (MPPT) algorithm in DC to DC conversion. It has some advantages such as fewer components, less weight and avoids complexity in controllers which inject steady current to the utility line. The effectiveness of the converters is verified through MATLAB Simulink.

Analysis, identification and design of robust control techniques for ultra-lift Luo DC-DC converter powered by fuel cell

In recent years the development of alternative energy source is getting more importance because of high quality characteristics in power generation system with low cost. The proliferation of DC-DC converter is widely used for high power and low voltage applications. In such cases, the ultra-lift Luo converter is the suitable one compared to voltage lift VL Luo-converter and super-lift (SL) Luo-converters because of their limitations in voltage transfer gain and more voltage ripples. This paper proposes the proportional integral (PI) and fuzzy logic (FL) controllers for the fast and efficient operation of ultra-lift (UL) Luo-converter. An air breathing fuel cell (ABFC) stack is developed and which is taken as an input power source to the ultra-lift Luo-converter. This paper will give focus on design, mathematical analysis and operation of fuel cell powered DC-DC converter is incorporated with PI and FL controllers which are simulated using MATLAB/Simulink software. Furthermore, simulation results of ABFC are also presented to review the effects of temperature from 30°C-70°C in fuel cell voltage. The dynamic response of PI and FL controllers are sifted for line as well as load voltage regulations and the simulation results are presented using MATLAB/Simulink.

Minimization of Cross-Regulation in PV and Battery Connected Multi-Input Multi-Output DC to DC Converter

This paper proposes a digital model predictive controller (DMPC) for a multi-input multi-output (MIMO) DC-DC converter interfaced with renewable energy resources in a hybrid system. Such MIMO systems generally suffer from cross-regulation, which seriously impacts the stability and speed of response of the system. To solve the contemporary issues in a MIMO system, a controller is required to attenuate the cross-regulation. Therefore, this paper proposes a controller, which increases speed of response and maintains stable output by regulating the load voltage independently. The inductor current and the capacitor voltage of the proposed converter are considered as the controlling parameters. With the aid of Forward Euler’s procedure, the future values are computed for the instantaneous values of controlling parameters. Cost function defines the control action by the predicted values that describe the system performance and establish optimal condition at which the output of the system is required. This allows proper switching of the system, thereby helping to regulate the output voltages. Thus, for any variation in load, the DMPC ensures steady switching operation and minimization of cross-regulation. To prove the efficacy of proposed DMPC controller, simulations followed by the experimental results are executed on a hybrid system consisting of dual-input dual-output (DIDO) positive Super-Lift Luo converter (PSLLC) interfaced with photovoltaic renewable energy resource. The results thus obtained are compared with the conventional PID (proportional integrative derivative) controller for validation and prove that the DMPC controller is able to control the cross-regulation effectively.

Analysis, identification and design of robust control techniques for ultra-lift Luo DC-DC converter powered by fuel cell

In recent years the development of alternative energy source is getting more importance because of high quality characteristics in power generation system with low cost. The proliferation of DC-DC converter is widely used for high power and low voltage applications. In such cases, the ultra-lift Luo converter is the suitable one compared to voltage lift VL Luo-converter and super-lift (SL) Luo-converters because of their limitations in voltage transfer gain and more voltage ripples. This paper proposes the proportional integral (PI) and fuzzy logic (FL) controllers for the fast and efficient operation of ultra-lift (UL) Luo-converter. An air breathing fuel cell (ABFC) stack is developed and which is taken as an input power source to the ultra-lift Luo-converter. This paper will give focus on design, mathematical analysis and operation of fuel cell powered DC-DC converter is incorporated with PI and FL controllers which are simulated using MATLAB/Simulink software. Furthermore, simulation results of ABFC are also presented to review the effects of temperature from 30°C-70°C in fuel cell voltage. The dynamic response of PI and FL controllers are sifted for line as well as load voltage regulations and the simulation results are presented using MATLAB/Simulink.

Performance Analysis and Comparative Study of Different Types of DC-DC Converters

This paper presents the design, analysis and comparison of different types of dc-dc converters. Now days due to lack of conventional energy sources like coal, petrol, diesel etc., demand of electricity is rising day to day. To fulfill this demand of electrical energy alternative methods are very much important now. The researchers stand motivating in solar energy generation, dc-dc converters etc. In this paper Performance analysis of different dc/dc converters and comparative study of them is focused. All converters will work in Continuous conduction mode. The performance analysis of different converters (Buck, Boost, Buck Boost, CUK, SEPIC, Positive Output Super-Lift Luo Converter) and comparison of those converter’s simulation results discussed using MULTISIM 14.0.

Performance improvement of Photo-Voltaic panels by Super-Lift Luo converter in standalone application

DC-DC converters play a vital role in the conditioning of power in the Renewable energy integrated standalone system. The DC-DC converters are of different topologies among them one of the efficient topologies in terms of power conversion is the Luo converters. The Luo converter with Super-Lift improves power efficiency by boosting the voltage in geometric progression. A Positive Output (P/O) Super-Lift Luo converter is compared with the performance of the conventional Boost converter wherein the converter minimizes the current ripples. The output of the standalone system can be improved by backing the Photo-Voltaic system with a Maximum Power Point Controller. The MPPT controller makes use of the traditional Perturb and Observe algorithm for harnessing maximum power from the PV panels.

Uçaklarda Kullanım Amaçlı Interleaved Süper Lift Luo Dönüştürücü Tasarımı

The main purpose of this study is to adapt a 28V battery powered super Lift Luo converter topology to the aircraft systems by adding the interleaving feature. It is aimed to have better efficiency compared to conventional designs. F-22 military aircraft and civil aircraft such as Boeing 787 use 270V DC for battery systems. New standards for the avionics using 270V DC may not apply to older avionics. Therefore, conversion from 28V to 270V can be an advantageous application for both new and old systems. As a result, an interleaved super lift Luo converter has been designed to increase the voltage from 28V to 270V with a quite high conversion ratio so existing old systems stay up-to-date due to developments. Analysis of this new interleaved super lift Luo converter was carried out with a double loop PI controller. The topology uses silicon carbide MOSFETs as high-frequency switches. This paper shows the design philosophy of the converter and proves the system with simulations.

MATLAB/SIMULINK STUDY OF EFFECTIVE CONTROLLER FOR DISCRETE SPEED PFC SUPER LIFT CONVERTER FED BLDC MOTOR DRIVE

This article deals about the MATLAB/Simulink study of Proportional Integral (PI) controller Plus Hysteresis Current Controller (HCC) for variable speed Power Factor Correction (PFC) Super Lift Luo Converter (SLLC) fed sensor less BLDC motor drive. In this study, a PFC SLLC functioned in continuous conduction mode (DCM) to provide proficient PFC at supply A.C mains. The major benefits of the proposed model have purging of front-side diode bridge rectifier that can help to minimize the switching losses connected with it, speed regulation is done without sensing speed feed-back of BLDC motor and achieve excellent PFC. In this article PI controller and HCC are designed for SLLC fed motor drive for regulating the output voltage of SLLC and controlling current of SLLC which results in improving PFC at supply mains. The recital of the designed model is verified at various working conditions by building of simulation software models. The responses are addressed to confirm the worth of the developed model.

Design and Implementation of Photovoltaic System Based on Super-Lift LUO Converter

The battery’s DC voltage has a high voltage ripple, and therefore does not apply to most devices. DC converters are used in the voltage to relieve ripples regardless of the change in load voltage. In this paper, a design and implementation of positive output super lift POSL LUO converter using maximum power point tracking (MPPT) Algorithm in photovoltaic (PV) system. In LUO converter is highly efficient with low ripple in current and voltage. The super lift converter is a developer converter that comes from the buck boost converter, it is considered of the best converters. Used for low voltage irregular in photovoltaic to a higher voltage without ripples or voltage step down according to the design of the converter, it therefore applies to most devices, such as electric vehicles, dc-chargers, etc. The efficiency of the panels can be improved using maximum power point tracking algorithm, among the many accessible MPPT methods, perturb and observe method. The proposed P&O method based on the PI controller gives the best duty cycle, to eliminate the oscillations in the converter output value, and extracts the highest energy from the PV system. The values of the PI controller are adapted by trial and error method. The results were confirmed using MATLAB / Simulink in DC-DC converter design with MPPT.

Analysis of super lift Luo converter with discrete time controller

An observer based analysis is carried out to improve the dynamic responses of the super lift Luo converter with positive output voltage along with a digital controller. The dynamics of the closed-loop system is investigated using discrete time modeling technique which includes the dynamic compensation in the form of prediction observer controller for obtaining output voltage regulation. The implementation which includes the digital state feedback and a load estimator is very simple and well-suited for the digitally controlled PWM converters. A suitable feedback matrix and a load estimator are selected to eliminate the error and to estimate the unmeasurable state variables. Thus we can obtain zero output voltage error, stability, robustness and stiff voltage regulation at the output. The feasibility and functionality of the discrete system are verified using simulation and experimental prototype of digitally controlled PWM superlift Luo converter.

Switched-mode Luo converter with power factor correction and fast regulation under transient conditions

New advancements in light-emitting diode (LED) have attracted many to use LEDs in commercial and industrial applications. In the recent years, new family of DC-to-DC converters, namely super-lift Luo converters, has evolved in the power electronics terrain which have high gain than the conventional boost converter. In this paper, AC–DC converter with super-lift Luo converter as PFC topology for high-brightness light-emitting diode applications is proposed. When subjected to load and line variations, power quality parameters of PFC AC–DC converter will have a change. The indices continue to change till the output voltage gets stabilized. For fast regulation under transient conditions, particle swarm optimization tuned proportional–integral (PI) controller is used. MATLAB/Simulink environment is used to carry out extensive simulation on the work proposed. The laboratory model is constructed and tested to verify simulation results. Total harmonic distortion at the input side of an AC–DC converter is validated as per the standards of IEC 61000-3-2 of class c equipment’s.

Comparison of Fractional Order Proportional Integral and Proportional Integral Controllers for super-lift Luo converter

Today, as a result of the immense applications which are used the ac-dc then step down voltage by using dc-dc converter such as the charger of mobile as well as for using the power produced from wind and solar power plants. The present work recommends the hypothesis and utilization of the fractional order proportional integral (FOPI) controller to manage and control the suggested super-lift Luo converter. Super-lift Luo converter is considered as modern technology converter which has numerous points of interest over different converters which are introduced in the literature. Fractional order proportional integral is contrasted with traditional proportional integral (PI) to demonstrate the capability of this controller to improve the rendering of the super-lift Luo converter. Various determinations for the response have been likewise estimated in this paper. At last, the FOPI is examined with different estimations of λ and the better worth is chosen. Matlab/Simulink R2017a has been utilized as a simulation software for all the results.

Nonlinear Control for Positive Output Super Lift Luo Converter in Stand Alone Photovoltaic System

This paper proposes a stand-alone photovoltaic (PV) system based on a DC-DC positive output super lift Luo (POSLL) converter. A conventional sliding mode control, a sliding mode controller using a simple sign function and a linear controller using proportional integrator (PI) are used for the control of the PV panel voltage and POSLL converter inductor current and these methods are compared together. The POSLL converter is a DC-DC converter with higher voltage gain compared to other conventional DC-DC converters, and has a good voltage regulation with a simple structure. The stability and accessibility of the proposed nonlinear controls are investigated widely. The internal dynamics of the proposed closed-loop control systems are also investiged. A practical implementation of the system on a hardware setup is performed using a low cost Discovery real time digital control platform. The experimental and simulation results demonstrate the validity of the proposed control schemes over a stand-alone real photovoltaic system.

Design and analysis of discrete PID controller for Luo converter

A thorough and effective analysis of the positive output super lift Luo converter along with the discrete PID controller has been carried out. The converter is designed to operate under continuous conduction mode and modelled using state space averaging method. The closed loop control is based on time domain approach and current mode discrete PID controller thus, designed tunes the system in such a way that the converter specifications are satisfied. The Luo converter along with the controller thus designed is robust, shows stiff output voltage regulation without any overshoots or undershoots and highly efficient. The steady state error is almost zero. Extensive simulation is carried out and the results are illustrated. The controller platform is verified using LabVIEW.