Positive Output Luo Converter Research Articles

Implementation of fuzzy logic controller for positive output LUO converter

This paper describes the fuzzy logic controller (FLC) for a positive output LUO converter (POLC), which uses a voltage controller to achieve the output voltage regulation. The fourth-order POLC DC–DC converter produces positive output voltage utilizing the voltage lift technique. Due to the converter’s switching functions and its inherently time-varying nature, it exhibits a highly nonlinear dynamic response. To enhance the dynamic performance of the converter, controllers are designed using small signal model and frequency response analysis. The closed loop is used to evaluate converter performance in the presence of variations in reference voltage, source voltage and load disturbances. The power loss analysis of the converter is performed. The comparative results show that FLC gives good dynamic response for wide range of variations than the proportional–integral (PI) controller. The prototype model is built using dsPIC (30F4011) microcontroller, and the experimental results are presented to validate the simulation results.

SSD-Based PSPWM Inverter Control for Grid-Integrated PV/Wind System with EPO-Based MPPT Using High Gain Converter

In this proposed work, Social Ski Driver (SSD)-based Phase Shift Pulse Width Modulation (PSPWM) controller for grid-connected solar photovoltaic (PV) and wind turbine with Emperor Penguin Optimization (EPO)-based Maximum Power Point Tracking (MPPT) is proposed. The PV panel and wind turbine generate the power, which is tracked by an EPO-based MPPT controller for maximum power. SSD-based PSPWM controller is used in the Voltage Source Inverter (VSI) for effective DC link utilization with less harmonic content. Multiple Input Single Output (MISO) super lift positive output LUO converter is a high-gain converter used for DC-DC conversion, which boosts the voltage of PV and wind. According to the switching signal, the converter provides improved voltage to the DC link. The wind system uses the Doubly Fed Induction Generator (DFIG) to convert mechanical energy into electrical energy. The gate pulse of VSI is tuned with SSD-based PSPWMs, thus will control the DC link voltage and provides a better voltage and current waveform with less harmonic content. This proposed system is implemented in MATLAB/Simulink software. The voltage and current values of an inverter, PV panel, wind turbine, DC link and grid are analyzed, and harmonic reduction for different frequencies are compared. The proposed system provides a better voltage and current waveform with less harmonic content.

Bridgeless Isolated Positive Output Luo Converter Based High Power Factor Single Stage Charging Solution for Light Electric Vehicles

In this article, a high-power factor ac–dc conversion system based on bridgeless isolated positive output Luo converter is demonstrated for light electric vehicles charging. Unlike conventional bridgeless Luo converters, the presented topology ensures positive voltage polarity at its output and incorporates a minimum component count over the universal supply voltage range of 85 <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">V</i> <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">RMS</sub> to 265 <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">V</i> <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">RMS</sub> . Meanwhile, the volume of magnetic components and the charger's cost are reduced by considering a discontinuous inductor current mode (DICM) design. To accomplish desired charging profile of the battery, a simple control incorporating few sensing devices and single gate drive circuitry, is utilized. It is noteworthy that, the single stage bridgeless structure of the presented topology with DICM design considerably reduces conduction and switching losses of the charger. Finally, the presented topology is designed and modeled through MATLAB environment, and its efficacy is tested through a prototype in the laboratory environment. The critical test results at various operating conditions are demonstrated to verify design and control objectives of the charger. A brief comparative analysis with existing solutions, is presented to justify the effectiveness of the presented solution.

An efficient scheme for battery assisted solar energized uninterrupted water supply utilizing switched reluctance motor drive

This work deals with a high gain (HG) DC-DC converter integrated scheme for solar power-fed water pump with battery energy storage (BES). The developed scheme confirms a reliable solution for non-interruptible water streaming under all environmental situations. The battery integrated with the system performs the functionality of a secondary energy source. The controller developed for the bidirectional converter at the battery side is incorporated the solar parameters. Hence, it enhances the dynamic performance of the charging-discharging of BES under varying environmental situations. The performance of solar panel output is optimized using an HG positive output Luo (POL) converter using the maximum power point tracking (MPPT) algorithm. The simulation is carried out to confirm the effectiveness of the present scheme. The captured performances are authenticated through experimental results on a present system.

Modeling and Analysis of Positive Output Luo Converter in Voltage Control Mode

Modeling and Analysis of Positive Output Luo Converter in Voltage Control Mode

Performance Analysis of Positive Output Luo Converter (Polc) for Pv Applications

The POLC (Positive Output LUO Converter) is a broadly useful DC to DC converter with buck and boost highlights. The geography of the POLC is unobtrusive, and it has the additional advantage that the extremity of the yield voltage doesn't get reversed with regard to the polarity of input voltage. Since the primary force control switch is arranged in series manner with the input switch and DC source, at whenever the exit point yields from the POLC isn't fundamental, it may be wholly stopped down or swapped by possession the other control switch which is to control the force is present in the OFF state. To the extent the topology of the POLC is concerned, it comprises of four stockpiling components such as two inductors and two capacitors, the force control switch and the force bearing managing diode. The appearance of four energy stockpiling components expands the request for the exchange capacity of the converter. The attribute of the converter gets nonlinear. The utilization of a PI regulator is checked for the voltage guideline of the yield DC voltage of the POLC. Utilizing the Kp and Ki esteems as provided by the Zeigler Nicholas strategy to change the exhibition of the POLC with a PI regulator, under source and burden aggravations just as following execution under adjusting rules are saved. Intellectual regulators which use a Fuzzy Logic to regulate and Artificial Neural Network (ANN) are at steady state, in recent times they include intelligence in their work. These regulators do not need perfect dimensional model, and similarly it can be utilized for schemes which are nonlinear is architecture and simulated in MATLAB platform for expanding the performance of the POLC converter. From this examination it is observed that there is an enhancement in the rise time and settling time with decrease in overshoot.

Study on Performance Analysis of Luo Converter with Fuzzy Controller

DC/DC converter occupies a major parte in generation of electric power from Renewable Energy Resources (RES). However, because of varying weather nature, the conventional converter exhibits poor conversion efficiency. Thus, this work proposed a Positive Output Luo Converter to have increased conversion efficiency. To extract maximised power from a PV system, P and O tracking system has been implemented. Thus, the performance of this proposed converter with FLC is examined using MATLAB. The results clearly stated that this proposed topology has higher ability to extract maximum power from a PV and thus reveals higher efficiency.

Performance evaluation of PI controller for positive output Luo converter

The aim of this work is to design and analyze a Proportional Integral (PI) controller for Positive Output Luo Converter applications. Positive Output Luo Converter is a developed DC-DC converter. It is respected as a right choice for most industrial application where the rate of the output load voltage must be varying between the low and high values of the input value of voltage, output voltage rise and fall is smaller. This converter involve Power electronics switches (Diodes and MOSFET) since these elements are non-linear. The detailed model includes high-frequency switching that is introducing discontinuities into the model. PI controller coefficients (kp, ki) are calculated by particle swarm optimization (PSO) to provide optimal PI as hybrid PI by PSO controller with simple design procedure .Transient and steady state responses requirement of the system are considered in designing the proposed PI controller. The consequences show that the time of performing characteristics of PSO-PI controller established on integral squared error (ISE) performance index has the best time performing characteristics, line disturbance, load disturbance and set point variation.

Stability Analysis of Luo Converter Using State Space Modeling

In this paper, stability of the Luo converter and the effect of circuit elements on the stability and damping fluctuation frequency is investigated. Along with this, the mathematical modeling of positive output (P/O) Luo converter in continuous conduction mode (CCM) is done by using an average state-space method. By using the obtained mathematical model, the transfer function of the Luo converter is extracted, and by using the location of the roots the mentioned transfer function, stability, and effect of circuit elements on converter behavior are studied. Also, its situations are compared with other converters. The analyses are performed through MATLAB based on simulations, which includes both roots location and bodes diagram.

Power Factor Improvement by Harmonic Reduction in Power System

The load with a poor power factor speeds up the flow of electrons when compared to the load with high power factor in the electrical power systems. The current extracted from the system is distorted by non-linear loads. In this paper, to achieve active power factor correction Boost converter topology is utilized. The boost converter topology must meet two concurrent conditions:1) the boost converter’s input value must be set lesser than the output voltage value and 2) the voltage at any point of time must be set in such a way that it is always proportional to the current. This scheme utilizes a positive output luo converter which is connected to rectifier circuit to offset the harmonic current from the rectifier. This paper presents a new control scheme to accomplish a power factor closer to unity.

Design and development of single phase AC–DC discontinuous conduction mode modified bridgeless positive output Luo converter for power quality improvement

Power factor corrected AC–DC converter topologies have been of research interest for DC power supplies. The main goal of this work is to improve power quality at the supply side and maintain constant DC voltage at the output side by designing a Modified Bridge Less Positive Output Luo (MBLPOL) power factor correction (PFC) converter. Discontinuous conduction mode is also possible for input PFC with a small filter at the source side. In order to regulate the DC load voltage for various loads and supply voltage conditions, a feedback control circuit with a single voltage sensor is proposed for the PFC converter. A prototype of 100 W, 48 V, AC–DC MBLPOL converter is designed and tested. Proper design of controller for the converter guarantees the excellent performance and the same is validated with the help of simulation and hardware results. The proposed MBLPOL converter is tested for DC load voltage regulation for various load power and supply voltage variations. The experimental study shows supply current total harmonic distortion of 1.24% at rated load while maintaining unity power factor.

ANN-based Maximum Power Point Tracking for a Large Photovoltaic Farm Through Wireless Sensor Networks

Background: A novel system for the usage of Maximum Power Point Tracking of an expansive Solar Photo Voltaic (SPV) farm subjected to conceivable incomplete shading is displayed in this paper. The SPV farm being spread over an expansive territory a remote sensor organize is utilized for checking the sun based protection in the region of each board. The motivation behind the remote sensor organize is to screen the sunlight based protection at various areas near each of the PV board from the tremendous region of the photograph voltaic homestead comprising of countless voltaic boards. The observed protection information is utilized by a prepared. Artificial Neural Network to locate the ideal DC terminal voltage to be kept up over the general DC terminals of the photograph voltaic ranch. All the PV boards are associated in arrangement association with the fundamental bye pass diodes. The DC control accessible at the yield terminals of the SPV cultivate is first DC to DC changed over with a Positive Output Luo Converter (POLC) and bolstered to a heap. A MATLAB Simulink based reproduction was created to approve the proposed system. Methods: Maximum Power Point Tracking based on Artificial Neural Network through wireless sensor networks. Results: As the result of the proposed idea and its implementation in MATLAB we have two sets of results. In either case the input is a vector of 40 elements and the output of the first segment of the work is the estimation of the threshold PV terminal voltage that will guarantees maximum power point operation. In the first case we have the MATLAB SIMULINK implementation of the basic configuration of the forty PV panels arranged in series connection and we have provided a facility to edit the solar insulation levels pertaining to the individual PV panels. In this first configuration we have set a continuously variable PV current for all the panels and the PV current for all the panel are the same. Using this setup, for any combination of solar insulation pattern of the forty panels the overall PV curve and the overall VI curve can be drawn in MATLAB. As the simulation runs the PV current is changed from 0 to the maximum or the short circuit current level in a slowly rising manner implemented using a ramp signal. &lt;/P&gt;&lt;P&gt; During this period the total power output and the terminal voltage of the PV farm are sent to the work space and the data is thus collected in the workspace of MATLAB. Using basic MATLAB commands the maximum power output and the PV terminal voltage corresponding to the maximum power output are obtained. The PV current at maximum power output condition, the corresponding PV farm terminal voltage, the maximum power output recorded at this condition all correspond to the present insulation vector condition. This way, by changing the elements of the insulation for all the forty panels in a random manner we obtain for each case the Ipmax[i], Pmax[i], Vpmax[i] and this corresponds to insulation[n,i]. Where n is the number of panels, in this case 40 and i the ith experiment. In each experiment the solar insulation level of all the forty panels can be changed and the parameters Vpmax[i], Ipmax[i] and Pmax[i] can be obtained. The value of the harvested power as found from the characteristics for any given set of insulation is denoted as the estimated power. The value of power as obtained from the proposed ANN SMC POLC combination is denoted as the Actual Power. Conclusion: A wireless network based insulation monitoring has been done. An ANN based MPPT algorithm has been developed that gives the reference MPP voltage. The sliding mode control scheme uses the reference voltage and produces the switching pulses for the POLC. The ANN had been trained with a number of combinations of different insulation values falling on each of the forty panels and the ANN gives the correct reference voltage for any combination of insulation levels that were not used while training. The sliding mode controller uses this reference voltage and gives the switching pulses to the POLC that harvests the maximum power output to the RL load. The proposed system has been implemented in the MATLAB SIMULINK environment and has thus been validated. The obtained results have been compared against the maximum power output values that could be derived from the characteristic curves obtained for the given combination of insulation levels. The proposed system gives results very close to the values obtained from the characteristics. As a future work the proposed idea can be validated using hardware based experimental setup.

Performance evaluation of conventional and fuzzy control systems for speed control of a DC motor using positive output Luo converter

Precise speed control of DC motors is an important requirement for efficient industrial automation and diverse applications fields. In this paper, a speed control of a DC motor for a photovoltaic system is proposed using fuzzy logic technique as a controller with a DC-DC converter type positive output Luo converter (POLC). POLC, one of a new generation of DC-DC converters which presents multiples advantages, is used as an intermediary between the photovoltaic source and the DC motor, in order to control the transmitted power with low power losses. Multiple classical control techniques could be used to control DC motor speed. However, in this work, a PI fuzzy logic controller (FLC) is proposed to get better pursuit, response and speed accuracy which represents important parameters to control on some industrial applications. Different system blocks are developed on MATLAB/Simulink as environment. Simulation results, using comparison between a conventional PID controller and the PI-fuzzy logic controller, demonstrate the good behaviour of the proposed system.

Performance evaluation of conventional and fuzzy control systems for speed control of a DC motor using positive output Luo converter

Precise speed control of DC motors is an important requirement for efficient industrial automation and diverse applications fields. In this paper, a speed control of a DC motor for a photovoltaic system is proposed using fuzzy logic technique as a controller with a DC-DC converter type positive output Luo converter (POLC). POLC, one of a new generation of DC-DC converters which presents multiples advantages, is used as an intermediary between the photovoltaic source and the DC motor, in order to control the transmitted power with low power losses. Multiple classical control techniques could be used to control DC motor speed. However, in this work, a PI fuzzy logic controller (FLC) is proposed to get better pursuit, response and speed accuracy which represents important parameters to control on some industrial applications. Different system blocks are developed on MATLAB/Simulink as environment. Simulation results, using comparison between a conventional PID controller and the PI-fuzzy logic controller, demonstrate the good behaviour of the proposed system.

Design, analysis, and implementation of an integral terminal reduced‐order sliding mode controller for a self‐lift positive output Luo converter via Filippov's technique considering the effects of parametric resistances

Design, analysis, and implementation of an integral terminal reduced‐order sliding mode controller for a self‐lift positive output Luo converter via Filippov's technique considering the effects of parametric resistances

Solar Powered Luo Converter for Wiper Motor Application

Objectives: This paper is to design a positive output elementary luo converter whose output can be used to power the wiper motor. Method/Statistical Analysis: The perturb and observe algorithm is used to obtain the maximum power from the solar panel. The positive output luo converter is simulated using MATLAB/Simulink software. Findings: In conventional converters the output voltage increases in arithmetic progression. But, in luo converter the output voltage increases in geometric progression, thus the voltage gain of the converter is enhanced than conventional converters. The output of the luo converter is validated with r-load and motor load. With the help of luo converter, the ripple content in the output can be highly reduced in the output. Applications: Wiper motors are used for applications such as to operate wiper blades in car, automatic parking system, wheel movement in robots etc.

Performance Analysis of Positive Output Super-Lift Re-Lift Luo Converter With PI and Neuro Controllers

DC-DC converters are widely used in computer peripheral equipments and industrial applications. Luo converter is a recently developed DC-DC converter. Positive output Luo converter performs the conversion from positive source voltage of one level to positive load voltage of another required level This paper presents simulation of PI and neuro controllers for a positive output super-lift re-lift DC-DC converter. Super lift converters make the output voltage increasing in geometric progression. They are different from any other existing DC-DC converters and possess many advantages including very high output voltage with small ripples. Therefore these converters will be widely used in industrial applications especially for very high voltage projects. Control algorithm is developed in this work to ensure tracking of the reference voltage and rejection of system disturbances by successive measurements of the converter output voltage at certain time instants within a conduction period. The main objective is simulation of PI and neuro controllers using MATLAB (version 7.1) software and evaluate the controller’s performances. The simulation results show that neuro controller provides quicker settling of output whereas PI controller creates less over shoot.

Control of chaos in positive output Luo converter using slope compensation method

This paper illustrates the control of chaotic behaviour in positive output Luo converter by slope compensation method. Bifurcation analysis is carried out in the discrete domain for a current controlled Luo converter operating in the continuous conduction mode. As the reference current is varied, periodic 1 orbit undergoes a flip bifurcation, periodic doubling and finally enters into chaotic regime. Variable ramp compensation technique is proposed to dynamically adjust the slope of the inductor current such that the upper bound of Iref is increased thereby widening the operating range. An iterative function that describes the dynamics of the inductor current with and without variable ramp compensation and the equivalent criteria for bifurcation-free operation is derived. A computer simulation using MATLAB/Simulink confirms the predicted bifurcations. The simulated results are validated through hardware implementation.

Design and implementation of zero-voltage-switching quasi-resonant positive-output Luo converter using analog resonant controller UC3861

This study presents the analysis, design and voltage regulation of a zero-voltage-switching quasi-resonant positive-output Luo converter with low switching losses for applications requiring constant power supply such as telemetry, computer and communication systems. To increase the power packing density, a simple control method using an analog resonant controller UC3861 is used to regulate the output voltage against load variation and supply disturbance. The performance of the controller is verified by developing a prototype model of the converter and experimental results are presented. The results reveal the superiority of using a single dedicated IC for voltage regulation. The efficiency of the converter is found to be 91%.

Positive output Luo converters: voltage lift technique

The voltage lift technique is a popular method that is widely applied in electronic circuit design. Because of the effect of parasitic elements, the output voltage and power transfer efficiency of DC-DC power converters are limited. The voltage lift technique opens a good way to improve circuit characteristics. After long-term research, this technique has been successfully applied for DC-DC power converters. Positive output Luo converters are a series of new DC-DC step-up (boost) converters, which were developed from prototypes using the voltage lift technique. These converters perform positive to positive DC-DC voltage increasing conversion with high power density, high efficiency and cheap topology in simple structure. They are different from other existing DC-DC step-up power converters and possess many advantages including a high output voltage with small ripples. Therefore, these converters will be widely used in computer peripheral equipment and industrial applications, especially for high output voltage projects.