Elementary Super Lift Luo Converter Research Articles

Design of type‐2 fuzzy logic controller optimized with firefly algorithm for maximum power point tracking of photovoltaic system based on super lift Luo converter

AbstractThe efficiency is a very important parameter for photovoltaic systems. Positive output elementary super lift Luo converter classified as high gain DC‐DC converter are used in photovoltaic systems because of their advantages such as high efficiency, reduced ripples, and low switching loss. The drawback of the photovoltaic system based on this converter is its sensitivity to small changes on the control signal. Both maximum power point tracking and control signal stability require a powerful control system as this is a challenging task for the photovoltaic system. Interval type‐2 fuzzy logic systems have recently been utilized in many control processes due to their ability to model uncertainties better than type‐1 fuzzy logic systems. In this work, interval type‐2 Takagi–Sugeno–Kang fuzzy logic controller was first designed as a controller. Then, the controller, which was proposed for this paper, was optimized with the Firefly Algorithm to improve the control performance. Performance of controllers is evaluated via comparative simulation studies under the most demanding environmental conditions. It has been observed that the proposed controller reduces the settling time by more than 50% and increases the efficiency up to 10% according to the simulation situations.

WITHDRAWN: Double Integral controller parameters for simulation analysis of the POESLLC in superlift LUO converter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

An Adaptive Estimator-Based Sliding Mode Control Scheme for Uncertain POESLL Converter

The positive output elementary super lift Luo (POESLL) converter is a dc–dc converter with a simple structure, which can increase input voltage with low ripples and high voltage gain. This study proposes an adaptive estimator-based sliding mode control scheme for the POSELL converter considering a reduced-order model of the converter with an unknown load and unknown input voltage. The proposed controller is composed of two parts: 1) an adaptive estimator, and 2) the sliding mode controller. At first, it is assumed that the state variables of the converter are available and adaptive estimator is proposed to facilitate the design of adaptive laws for estimating unknown parameters. Then, the sliding mode control input is designed based on the estimation of unknown parameters. Stability analysis of the proposed scheme is provided and σ-modification type robust adaptive laws for estimating the uncertain parameters are derived based on the Lyapunov direct method. Furthermore, one modification term is proposed to satisfy the sliding condition. Finally, the proposed scheme is experimentally implemented in real time using STM32F407VG discrete signal processor board interfaced with MATLAB. In addition, in order to compare and highlight the effective performance of the proposed scheme, the proportional-integral (PI) controller is designed and implemented. Experimental results are presented for both of the proposed approach and the PI one. The results verify the ability of the proposed scheme for voltage regulation as well as its robustness against parameter uncertainties. Additionally, comparison results demonstrate that the proposed controller has superior performance than the PI controller.

Positive Output Elementary Super Lift Luo Converter Using Pi Controller

An Electron device and circuits that converts an origin of direct current from one particular level of voltage to another is represent a boost converter. To achieve high step up voltage gain, it uses coupled inductor and the voltage lift technique. However, there is a reduced stress on the animated switch as it is attached and the energy deposited in the leakage conductor is reused, hence increasing its conversion efficiency. In this paper, a Proportional-Integral control has been designed for the positive output of the Elementary Super Lift LUO Converter using a bidirectional Capacitor , Super Lift LUO converter which uses the voltage lift capability to donate a less ripple, very high power density, higher efficiency, voltage gain and a less complicated structure. A comprehensive analysis and modeling was also implemented.

Reduced-Order Backstepping Controller for POESLL DC–DC Converter Based on Pulse Width Modulation

In this paper, a new technique is discussed to control a DC–DC power converter with non-minimum phase structure. DC–DC converters have physically nonlinear structure and need a nonlinear controller for better performance. Positive output elementary super lift Luo converter (POESLLc) is a new DC–DC converter with low losses, high efficiency, and high voltage gain. A backstepping controller is suggested for POESLLc. It regulates the output voltage based on pulse width modulation. The closed-loop control system is not necessarily robust against working point variations. Considering uncertainty in load, an adaptive scheme is adopted to achieve an excellent performance. Global stability of backstepping controllers is demonstrated by using Lyapunov theory. Some main features of the proposed controller are: robustness against uncertainty, fixed switching frequency, fast response, and elimination of the chattering compared with sliding mode control. Simulation results are demonstrated to verify the performance of the proposed controllers in different operating points.

Performance Measures of Positive Output Superlift Luo Converter Using Multitudinous Controller

In order to meet the increase in energy demand globally it is necessary to harness renewable energy at its maximum potential for the purpose of electric power generation. For the achievement of high output voltage and efficiency DC-DC converters plays a vital role in low voltage PV array and fuel cells. LUO converters are gaining importance because of geometric progression output. . LUO converters find its application because of high transient performance of the system, high power transfer gain, efficiency and reduced ripple .Because of load and line disturbances the output voltage of DC-DC converter must be operated in closed loop mode. This paper interpolates multitudinous controller for positive output elementary super lift LUO converter (POESLL). The pursuance of the converter under manifold such as variation in input, load are developed and compared for current mode controller and SMC.

Analysis-intelligent design and simulation of improved state–space modelling for control of Luo converter

DC–DC converters are commonly used in industrial drives. A positive-output elementary super lift Luo converter (POESLLC) provides efficient output compared to the conventional DC–DC converter. The control strategy is developed by considering the effects of source resistance and variation in the non-linearity of the inductor and capacitor during charging and discharging periods by performing state–space average modelling for POESLLC. The developed transfer function for POESLLC is analysed by various duty cycles, inductor values, and capacitor values. The pole–zero map indicates that the system is unstable. A compensator and a proportional integral derivative (PID) controller are designed for the stable operation of the system. It is found that the use of a compensator provides better settling time as compared to the PID controller.

PI and PWM Sliding Mode Control of POESLL Converter

The positive output elementary superlift-Luo converter (POESLLC) is a type of dc/dc converter. This dc/dc converter has an attractive advantage of a high voltage transfer gain as compared with other conventional dc/dc converters. Because of the voltage and load variations and also switching operation, the dynamic and static performances of the POESLLC are nonlinear and time varying. In order to achieve an excellent performance, a nonlinear controller is required. In this paper, a robust and fast response controller for voltage regulation of a POESLLC is presented. A proportional integral and pulse width modulation sliding mode controller are combined to control a third-order POESLLC. The proposed controller can be applied in the continuous conduction mode. Some simulations and experimental results are presented to show the effectiveness of the developed controller in different operating conditions. Furthermore, it will be shown that the developed controller is successful in suppressing the steady-state error of the output voltage of the POESLLC as well as the number of reduction of sensors.

Improved DC Model and Transfer Functions for the Negative Output Elementary Super Lift Luo Converter

Improved DC Model and Transfer Functions for the Negative Output Elementary Super Lift Luo Converter

Design and Implementation of Sliding Mode Controller Plus Fuzzy Logic Controller for Discontinuous Conduction Mode Operation of Negative Output Elementary Super Lift Luo Converter

Design and Implementation of Sliding Mode Controller Plus Fuzzy Logic Controller for Discontinuous Conduction Mode Operation of Negative Output Elementary Super Lift Luo Converter

Indirect Output Voltage Control in Negative Output Elementary Super Lift Luo Converter Using PIC plus FLC in Discontinuous Conduction Mode

In this paper, the design of a proportional integral controller (PIC) plus fuzzy logic controller (FLC) for the negative output elementary super lift Luo converter (NOESLLC) operated in discontinuous conduction mode (DCM) is presented. In spite of the many benefits viz. the high voltage transfer gain, the high efficiency, and the reduced inductor current and the capacitor voltage ripples, it natured with non-minimum phase. This characteristic makes the control of NOESLLC cumbersome. Any attempt of direct controlling the output voltage may erupt to instability. To overcome this problem, indirect regulation of the output voltage based on the two-loop controller is devised. The savvy in the inductor current control improves the dynamic response of the output voltage. The FLC is designed for the outer (voltage) loop while the inner (current) loop is controlled by the PIC. For the developed ?19.6 V NOESLLC, the dynamic performances for different perturbations (line, load and component variations) are obtained for PIC plus FLC and compared with PIC plus PIC. The study of two cases is performed at various operating regions by developing the MATLAB/Simulink model.

Adaptive sliding mode control method for DC–DC converters

This study presents an adaptive sliding mode control method for DC–DC converters. In the state space model of DC–DC converters, there are always some unknown coordinate components of the desired equilibrium point (static working point), which are necessary to obtain the error vector and then build the sliding surface. To obtain the unknown coordinate components of the equilibrium point, an adaptive law is proposed. The adaptive law and the error response are formulated in a single equation, which determines the system performance. A systematic sliding mode control design procedure of a class of DC–DC converters is hence carried out. To verify the usefulness and effectiveness of the proposed adaptive sliding mode control method, the negative output elementary super lift Luo converter is used as a design example. Simulation and experimental results are reported to confirm the proposed approach.

Design and implementation of reduced‐order sliding mode controller plus proportional double integral controller for negative output elementary super‐lift Luo‐converter

This study presents a simple sliding surface design of variable frequency-based reduced-order sliding mode controller (ROSMC) plus proportional double-integral controller (PDIC) for the negative output elementary super-lift Luo-converter (NOESLLC) operated in continuous conduction mode (CCM). Owing to the time-varying switched mode operation, the dynamic characteristics of the NOESLLC is non-linear and the developed ROSMC plus PDIC aims at improving the dynamic performance along with the inductor current and the output voltage regulation of the NOESLLC. The developed ROSMC is well suitable to the inherently variable-structured NOESLLC when represented in the reduced-order state-space average-based model. The designed PDIC eliminates the steady-state error and also excellent start-up response of NOESLLC despite of line and load variations. The performance of the developed controller is verified for its robustness to perform over a wide range of operating conditions through both in MATLAB/Simulink models as well as in the laboratory prototype with the comparative study of a typical ROSMC plus proportional-integral-controller. Simulation and experimental results are showed that ROSMC plus PDIC can achieve proficient output voltage and inductor current regulation at various working conditions.

Modelling and implementation of fixed switching frequency sliding mode controller for negative output elementary super lift Luo-converter

This study presents a reduced-order state-space average model and a fixed switching frequency (FSF) sliding mode controller (SMC) for the negative output elementary super lift Luo-converter (NOESLLC) operated in continuous conduction mode for application fields requiring the constant power source such as medical, telecommunication, industrial, military etc. The NOESLLC is an attractive dc-dc converter that can provide high-voltage transfer gain. Owing to the time-varying switched mode operation, the dynamic performance of the NOESLLC becomes highly non-linear. In order to enhance the dynamics performance and output voltage regulation of the NOESLLC, the FSFSMC is developed. The proposed FSFSMC is more appropriate to the inherently variable-structured NOESLLC when represented in the reduced-order state-space average-based mathematical model. The three conditions of FSMSMC applicable to the NOESLLC, namely, existence, reaching and stability conditions are analysed. The performance of the developed controller is validated for its robustness to perform over a wide range of working conditions through both in MATLAB/Simulink models and as well as in the laboratory prototype with the comparative study of a typical proportional-integral-controller. Theoretical analysis, simulation and experimental results are presented to demonstrate the feasibility of the designed FSFSMC along with the complete systematic design procedure.