High‐voltage gain dc–dc boost converter with coupled inductors for photovoltaic systems

This paper introduces three topologies of a non-isolated high gain step-up Cuk converter based on a switched-inductor (SL) and switched-capacitor (SC) techniques for renewable energy applications, such as photovoltaic and fuel cells. These kinds of Cuk converters provide a negative-to-positive step-up dc-dc voltage conversion. The proposed three topologies SLSC Cuk converters increase the voltage boost ability significantly using the switched-inductor and switched-capacitor techniques compared with the classical Cuk and boost converters. The proposed Cuk converters are derived from the classical Cuk converter by replacing the single inductor at the input and output sides with a SL and the transferring energy capacitor by a SC. The main advantages of the proposed SLSC Cuk converters are achieving a high voltage conversion ratio and reducing the voltage stress across the main switch. Therefore, a switch with low voltage rating and thus, of low R DS−ON can be used, and that leads to a higher efficiency. For example, the third topology have the ability to boost the input voltage up to 13 times when D = 0.75, D is the duty cycle. The voltage gain and the voltage stress across the main switch in the three topologies have been compared with the classical Cuk and boost converter. The proposed three topologies avoid using a transformer, coupled inductors, or extreme duty cycles leading to less volume, loss, and cost. The proposed SLSC Cuk converters are analyzed in continuous conduction mode (CCM), and they have been designed for 12 V input supply voltage, 100 W rated power, 50 kHz switching frequency, and 75% duty cycle. A detailed theoretical analysis of the CCM is represented and all the equations have been derived and matched with the results. The proposed three topologies SLSC Cuk converters have been simulated in MATLAB/SIMULINK and results are discussed.

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“…The reverse voltage across D 4 and D 5 of the SC applied when they are blocked (ON-mode) is expressed in (15).…”

Section: Circuit Analysismentioning

confidence: 99%

“…Converters with coupled inductors topology can accomplish high voltage gain [12][13][14][15][16][17]. However, using coupled inductors topology will reduce the efficiency due to the losses associated with the leakage inductors.…”

Section: Introductionmentioning

confidence: 99%

Three Topologies of a Non-Isolated High Gain Switched-Inductor Switched-Capacitor Step-Up Cuk Converter for Renewable Energy Applications

Almalaq

Matin

2018

Electronics

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“…This helps us to choose MOSFETs of low R DS(ON ) and thus improves the efficiency by reducing the conduction loss. Moreover in the proposed converter, voltage stress on the semiconductor devices depends on the turns ratio of the coupled inductor and independent of the input voltage variations as given by (20)- (21). Hence the turns ratio of the coupled inductor can be selected properly to reduce the voltage stress.…”

Section: Performance Comparison Of Proposed Convertermentioning

confidence: 99%

“…Natural voltage balancing of the output capacitor and lower device stress are the advantage of this voltage multiplier. In nonisolated coupled inductor converters, to reduce the voltage stress on the output diode and also to improve the voltage gain, voltage multipliers which are used in the isolated converters are introduced at the secondary side of the coupled inductor [3], [5], [14]- [21]. These converters achieve higher voltage gain without extreme duty ratio operation.…”

Section: Introductionmentioning

confidence: 99%

ZVS–ZCS High Voltage Gain Integrated Boost Converter for DC Microgrid

Sathyan

Suryawanshi

Singh

et al. 2016

IEEE Trans. Ind. Electron.

109

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A non-isolated soft switched integrated boost converter having high voltage gain is proposed for the module integrated PV systems, fuel cells and other low voltage energy sources. Here a bidirectional boost converter is integrated with a resonant voltage quadrupler cell to obtain higher voltage gain. The auxiliary switch of the converter, which is connected to the output port acts as an active clamp circuit. Hence ZVS (zero voltage switching) turn on of the MOSFET switches are achieved. Coupled inductor's leakage energy is recycled to the output port through this auxiliary switch. In the proposed converter, all the diodes of the quadrupler cell are turned off with ZCS (zero current switching). This considerably reduces the high frequency turn off losses and reverse recovery losses of the diodes. ZCS turn off of the diodes also remove the diode voltage ringing caused due to the interaction of the parasitic capacitance of the diodes and the leakage inductance of the coupled inductor. Hence to protect the diodes from the voltage spikes, snubbers are not required. The voltage stress on all the MOSFETs and diodes are lower. This helps to choose switches of low voltage rating (low RDS(ON )) and thus improve the efficiency. Design and mathematical analysis of the proposed converter are made. A 250W prototype of the converter is built to verify the performance.

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“…[42][43][44] Nonisolated converters with appropriate gain extension techniques are preferred over isolated converters (which use transformers) mainly due to their merits like higher efficiency, reduced volume, and size. Some of the commonly used gain extension methods are coupled inductor (CI) with and without IBC, 45,46 switched capacitor cells, voltage doublers, 47 voltage multiplier cells (VMCs), 48 and charge pump technique. Though modular multilevel converters can cater to the high-gain requirements, higher component count reduces their efficiency.…”

mentioning

confidence: 99%

High-gain-high-power (HGHP) DC-DC converter for DC microgrid applications: Design and testing

Revathi

Prabhakar

González-Longatt

2017

Int Trans Electr Energ Syst

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Summary The use of green energy sources to feed direct current (DC) microgrids is gaining prominence over traditional centralised alternating current (AC) systems. Direct current microgrids are characterised by the use of intermediate DC‐DC converter, which acts as power conditioning units. Hence, the choice of an appropriate DC‐DC converter becomes significant as the overall system efficiency is strongly dependent on the converter's performance. This paper proposes a novel high‐gain–high‐power DC‐DC converter for DC microgrid, which is one of the significant steps forward in the development of DC microgrids. The suitability of the proposed high‐gain–high‐power DC‐DC converter is demonstrated by experimental tests of the 60 V/1.1 kV, 3 kW converter; test results validate the converter's suitability for DC distribution. A significant number of performance parameters of the proposed converter are compared with state‐of‐the‐art converter topologies demonstrating the superior capabilities of the proposed converter. This paper also portrays the potential benefits that could be reaped by trending towards DC instead of existing alternating current system. The advantages and challenges to be confronted in the foreseeable future while implementing sustainable DC microgrids are also highlighted. Finally, this paper encapsulates renewable energy fed DC microgrid system as an appropriate, technically feasible, economically viable, and competent solution for efficiently utilising the sustainable energy sources.

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High‐voltage gain dc–dc boost converter with coupled inductors for photovoltaic systems

Cited by 109 publications

References 38 publications

Three Topologies of a Non-Isolated High Gain Switched-Inductor Switched-Capacitor Step-Up Cuk Converter for Renewable Energy Applications

Three Topologies of a Non-Isolated High Gain Switched-Inductor Switched-Capacitor Step-Up Cuk Converter for Renewable Energy Applications

ZVS–ZCS High Voltage Gain Integrated Boost Converter for DC Microgrid

High-gain-high-power (HGHP) DC-DC converter for DC microgrid applications: Design and testing

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