scholarly journals A Modified Boost-Boost High Gain DC-DC Converter for Photovoltaic (PV) Based Off- Grid Applications

2020 ◽  
Vol 27 (2) ◽  
pp. 70-75
Author(s):  
H. Isah ◽  
Y.M. Sagagi ◽  
A. Bako
Keyword(s):  
Duty Cycle ◽  
Individual Component ◽  
Low Cost ◽  
Input Voltage ◽  
High Gain ◽  
Boost Converters ◽  
Low Duty Cycle ◽  
High Voltage Gain ◽  
Grid Applications ◽  
Conduction Mode

This study presents a single switch non-isolated DC-DC converter good for photovoltaic (PV) applications. The proposed topology was constructed using two classical DC-DC boost converters by arranging them in cascade for providing high voltage gain, low duty-cycle, less stress across the semiconductor devices, less size, and low cost. The operating principle and steady-state analysis of an individual component of the proposed topology in continuous conduction mode (CCM) are discussed and the results obtained improved the ones in literatures. The prototype of 120 V DC output voltage with 9 V DC input voltage is implemented and the result obtained validate the simulated result of the proposed converter. Keywords: DC-DC converter, Photovoltaic (PV), Single switch, High gain, Duty-cycle.

scholarly journals Performance and Stability Analysis of Series-Cascaded, High-Gain, Interleaved Boost Converter for Photovoltaic Applications

2018 ◽  
Vol 3 (1) ◽  
pp. 85-97 ◽  
Author(s):  
C. Prasanna Kumar ◽  
N. Venugopal
Keyword(s):  
Duty Cycle ◽  
Input Voltage ◽  
High Gain ◽  
Boost Converter ◽  
Boost Converters ◽  
Novel Approach ◽  
Photovoltaic Applications ◽  
Interleaved Boost Converter ◽  
In Series ◽  
Source Voltage

Abstract Interleaved boost converters (IBCs) are cascaded in parallel in most of the applications. This novel approach connects IBC in series cascade. The IBC has an optimal operating duty cycle of 0.5. Normally, photovoltaic source voltage is low because of space constraints. In order to boost the source voltage, a conventional boost converter is replaced with series-cascaded IBC in this paper. The single-stage IBC also boosts the voltage to twice the input voltage. In the proposed converter, output voltage is about four times the input voltage with the same 0.5 duty cycle. A mathematical model is developed and simulated for the proposed work in MATLAB/Simulink platform. The output of the proposed circuit is analysed through fast Fourier transform to know the harmonic content due to the switching. The system is tested for stability with signal-flow graph modelling. The proposed work is realised using hardware and tested to validate the model.

scholarly journals Two-Switch High Gain Non-Isolated Cuk Converter

2020 ◽  
Vol 10 (5) ◽  
pp. 6362-6367
Author(s):  
Y. Almalaq ◽  
M. Matin
Keyword(s):  
Duty Cycle ◽  
Output Voltage ◽  
Input Voltage ◽  
High Gain ◽  
Switching Frequency ◽  
Voltage Gain ◽  
Cuk Converter ◽  
Voltage Stress ◽  
Key Aspects ◽  
Conduction Mode

This paper introduces a two-switch high gain non-isolated Cuk converter which can be used as a high gain DC-DC converter in renewable energy, such as photovoltaic and fuel cell, applications because their output is low. As the conventional, the proposed Cuk converter provides negative output voltage but with a higher voltage in magnitude. The main advantage of the proposed converter is having lower voltage stress with the ability to maintain a higher voltage gain. By combining a switched-inductor and a switched-capacitor into the conventional Cuk converter, the proposed Cuk converter has the ability to reach 13 times the input voltage for a duty cycle D of 0.75. Also, by attaching more switched-inductors to the proposed Cuk converter, more voltage gain can be achieved. A complete theoretical analysis of the Continuous Conduction Mode (CCM) of the proposed Cuk converter is presented and the key aspects of the circuit design have been derived. Also, a comparison in terms of voltage gain and voltage stress between the proposed Cuk converter and Cuk converters using other techniques is presented. The proposed Cuk converter has been designed for 100W rated power, -152V output voltage, 50kHz switching frequency, and 75% duty cycle. The presented converter is simulated in Matlab/Simulink and the results are discussed.

scholarly journals High gain boost converter with modified voltage multiplier for stand alone PV system

2019 ◽  
Vol 14 (1) ◽  
pp. 185
Author(s):  
Getzial Anbu Mani ◽  
A. K. Parvathy
Keyword(s):  
High Efficiency ◽  
Input Voltage ◽  
High Gain ◽  
Boost Converter ◽  
Pv System ◽  
Boost Converters ◽  
Low Input ◽  
Voltage Multiplier ◽  
Photo Voltaic ◽  
Current Ripple

<p>Boost converters of high gain are used for photo voltaic systems to obtain high efficiency. These high gain Boost converters gives increased output voltage for a low input produces high outputs for low input voltage. The High gain boost converters have the following merits. Conduction losses input current ripple and stress across the switches is reduced while the efficiency is increases. The high gain of the converters with the above said merits is obtained by changing the duty cycle of switches accordingly .In this paper a boost converter working with interleaved concept along with a additional Nstage voltage Multiplier has been carried out by simulation using MATLAB/ simulink and the mathematical modeling of various parameters is also done.</p>

scholarly journals Modeling, Design Procedure and Control of a Low-Cost High-Gain Multi-Input Step-Up Converter

Electronics ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 1424
Author(s):  
Edgardo Netzahuatl ◽  
Domingo Cortes ◽  
Marco A. Ramirez-Salinas ◽  
Jorge Resa ◽  
Leobardo Hernandez ◽  
...  
Keyword(s):  
Nonlinear Model ◽  
Low Cost ◽  
Renewable Energy Sources ◽  
Design Procedure ◽  
Input Voltage ◽  
High Gain ◽  
Grid Systems ◽  
Real Behavior ◽  
Different Characteristics ◽  
And Control

The use of several different sources to feed a load jointly is convenient in many applications, in particular those where two or more renewable energy sources are employed. These applications include energy harvesting, hybrid vehicles, and off-grid systems. A multi-input converter able to admit sources of different characteristics and select the output power of each source is necessary in such applications. Several topologies of multi-input converters have been proposed to this aim; however, most of them are controlled by simple strategies based on a small signal model of multi-input converters. In this work, a low cost high gain step-up multi-input converter is analyzed. A nonlinear model is derived. Using this model, a detailed design procedure is proposed. A 500 W converter prototype was constructed to confirm that the model predicted the real behavior of the converter. Using the nonlinear model, indirect voltage control of basic converters was extended to the multi-input converter. The obtained controller had a fast performance, and it was robust under load and input voltage variations. With the obtained model, the proposed design procedure, and the controller, a converter that was initially proposed for photovoltaic applications was enabled to be used in a broader range of applications. The herein exposed ideas for modeling, the design procedure, and control could be also applied to other multi-input converters.

A New Transformer-Less Structure for a Boost DC-DC Converter with Suitable Voltage Stress

Automation ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 220-237
Author(s):  
Farzad Mohammadzadeh Shahir ◽  
Meysam Gheisarnejad ◽  
Mohammad-Hassan Khooban
Keyword(s):  
Operating Mode ◽  
Input Current ◽  
Voltage Gain ◽  
Passive Components ◽  
Theoretical Concepts ◽  
Boost Converters ◽  
High Voltage Gain ◽  
Voltage Stress ◽  
Output Capacitance ◽  
Conduction Mode

In this paper, a new structure is proposed for a boost dc–dc converter based on the voltage-lift (VL) technique. The main advantages of the proposed converter are its lack of transformer, simple structure, free and low input current ripple, high voltage gain capability by using an input source, suitable voltage stress on semiconductors and lower output capacitance. Herein, the analysis of the proposed converter operating and its elements voltage and current relations in continuous conduction mode (CCM) and discontinuous conduction mode (DCM) are presented, and the voltage gain of each operating mode is individually calculated. Additionally, the critical inductance, current stress of switches, calculation of passive components’ values and efficiency are analyzed. In addition, the proposed converter is compared with other studied boost converters in terms of ideal voltage gain in the CCM and the number of active and passive components, maximum voltage stress on semiconductors, and situation of input current ripples. The correctness of the theoretical concepts is examined from the experimental results using the laboratory prototype.

scholarly journals High-Gain High-Efficiency DC–DC Converter with Single-Core Parallel Operation Switched Inductors and Rectifier Voltage Multiplier Cell

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4634
Author(s):  
Eduardo Augusto Oliveira Barbosa ◽  
Márcio Rodrigo Santos de Carvalho ◽  
Leonardo Rodrigues Limongi ◽  
Marcelo Cabral Cavalcanti ◽  
Eduardo José Barbosa ◽  
...  
Keyword(s):  
High Voltage ◽  
Duty Cycle ◽  
High Efficiency ◽  
High Gain ◽  
Voltage Gain ◽  
Parallel Operation ◽  
Voltage Multiplier ◽  
Coupled Inductors ◽  
High Voltage Gain

This paper proposes a high step-up high-efficiency converter, comprised of an active switched coupled-inductor cell. The secondary windings are integrated into a rectifier voltage multiplier cell in a boost-flyback configuration, allowing the operation with high voltage gain with low switches duty cycle and low turn-ratios on the coupled-inductors. Both coupled-inductors are integrated into a single core due to the parallel operation of the switches. The leakage inductances of the coupled-inductors are used to mitigate the reverse recovery currents of the diodes, while regenerative clamp circuits are used to protect the switches from the voltage spikes caused by the leakage inductances. The operation of the converter is analyzed both quantitatively and qualitatively, and the achieved results are validated through experimentation of a 400 W prototype. A 97.1% CEC efficiency is also reported.

scholarly journals Study on Multiple Input Asymmetric Boost Converters with Simultaneous and Sequential Triggering

Electronics ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1421
Author(s):  
Juan-Gerardo Parada-Salado ◽  
Martín-Antonio Rodríguez-Licea ◽  
Allan-Giovanni Soriano-Sanchez ◽  
Omar-Fernando Ruíz-Martínez ◽  
Alejandro Espinosa-Calderon ◽  
...  
Keyword(s):  
Low Cost ◽  
Green Energy ◽  
Control Algorithms ◽  
Stable Operation ◽  
Voltage Step ◽  
Boost Converters ◽  
Multiple Input ◽  
And Control ◽  
Conduction Mode ◽  
Circulating Currents

Paralleled boost asymmetric configurations operating in discontinuous conduction mode (DCM) are suitable for integrating dissimilar green energy generating sources and control algorithms in versatile scenarios where voltage step-up, low cost, stable operation, low output ripple, uncomplicated design, and acceptable efficiency are needed. Unfortunately, research has mainly been conducted on the buck, sepic, switched-capacitor, among other asymmetric configurations operating in continuous conduction mode (CCM), to the authors’ knowledge. For asymmetric boost type topologies, achieving simultaneous CCM is not a trivial task, and other problems such as circulating currents arise. Research for interleaved converters cannot be easily extended to asymmetric boost topologies due to the dissimilarity of control algorithms and types of sources and parallel stages. This paper analytically establishes properties of stability, output ripple, output voltage, and design for asymmetrical paralleled boost converters operating in DCM with simultaneous or phase delayed (sequential) triggering. A 300 W experimental design and the respective tests allow validation of such properties, resulting in an easy-to-implement configuration with acceptable efficiency.

scholarly journals High Gain Non Isolated DC-DC Step-up Converters Integrated with Active and Passive Switched Inductor Networks

2018 ◽  
Vol 9 (2) ◽  
pp. 679
Author(s):  
M. Al Mamun ◽  
Golam Sarowar ◽  
Md. Ashraful Hoque ◽  
Mehedi Azad Shawon
Keyword(s):  
Duty Cycle ◽  
Electromagnetic Interference ◽  
High Gain ◽  
Boost Converter ◽  
Conduction Loss ◽  
High Voltage Gain ◽  
Power Switches ◽  
Converter Topologies ◽  
Bus Voltage ◽  
High Level

High gain dc-dc step up converters have been used in renewable energy systems, for example, photovoltaic grid connected system and fuel cell power plant to step up the low level dc voltage to a high level dc bus voltage. If the conventional boost converter is to meet this demand, it should be operated at an extreme duty cycle (duty cycle closes to unity), which will cause electromagnetic interference, reverse recovery problem and conduction loss at the power switches. This paper proposes a class of non-isolated dc-dc step up converters which provide very high voltage gain at a small duty cycle (duty cycle &lt; 0.5). Firstly, the converter topologies are derived based on active switched inductor network and combination of active and passive switched inductor networks; secondly, the modes of operation of proposed active switched inductor converter and combined active and passive switched inductor converter are illustrated; thirdly, the performance of the proposed converters are analyzed mathematically in details and compared with conventional boost converter. Finally, the analysis is verified by simulation results.

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