scholarly journals Design and Analysis of a High-Gain Step-Up/Down Modular DC–DC Converter with Continuous Input Current and Decreased Voltage Stress on Power Switches and Switched-Capacitors

2021 ◽  
Vol 13 (9) ◽  
pp. 5243
Author(s):  
Maysam Abbasi ◽  
Ehsan Abbasi ◽  
Li Li ◽  
Behrouz Tousi
Keyword(s):  
High Voltage ◽  
Output Voltage ◽  
Renewable Energy Sources ◽  
High Gain ◽  
Voltage Regulation ◽  
Input Current ◽  
Switched Capacitors ◽  
Voltage Stress ◽  
Power Switches ◽  
Continuous Input

Due to concerns, such as global warming and depletion of fossil fuels, countries are forced to integrate energy storage devices (ESSs) and renewable energy sources (RESs), such as photovoltaic (PV) systems, wind turbines and fuel cells, into their power networks. Here, a new high gain DC–DC converter with step-up/down ability is proposed for modern applications. Since this converter provides high variable voltage gain, it can be employed for output voltage regulation purposes in RESs such as solar panels. Additionally, this converter provides a remarkable reduction in voltage stress on the switched capacitors and power switches. Due to its modular structure obtained by employing switched-capacitors (SCs), it is possible for this topology to gain a very high voltage conversion ratio using low duty-cycles produced by a simple and straightforward control system. To be specific, the more the number of SC cells increase, the more the output voltage increases. The proposed converter has a continuous input current allowing to extract the maximum power from RESs like PV panels. It should be noted that the application of this converter is not limited to the aforementioned ones since it can be used in various applications needing high voltage gains such as generating the desired voltage level in high voltage direct current (HVDC) systems especially their transmission lines. For validating the performance of the proposed structure, comprehensive comparisons and experimental results are presented.

scholarly journals A Switched Quasi-Z-Source Inverter with Continuous Input Currents

Energies ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1390 ◽  
Author(s):  
Jing Yuan ◽  
Yongheng Yang ◽  
Frede Blaabjerg
Keyword(s):  
Lower Cost ◽  
Renewable Energy Sources ◽  
Power Conversion ◽  
Experimental Tests ◽  
Superior Performance ◽  
Passive Components ◽  
Prior Art ◽  
Voltage Stress ◽  
Power Switches ◽  
Continuous Input

Impedance source converters as single-stage power conversion alternatives can boost and regulate the output voltages of renewable energy sources. Nevertheless, they, also known as Z-source inverters (ZSIs), still suffer from limited voltage gains and higher stresses across the components. To tackle such issues, extra diodes, passive components, and active switches can be utilized in the basic ZSIs. In this paper, a modified switched-quasi-Z-source inverter (S-qZSI) is proposed, which features continuous input currents and high boosting capability to boost output voltage by minor modifications of a prior-art topology. Furthermore, the voltage stress of the active switches is reduced, which contributes to a lower cost. The operation principles are discussed comprehensively. The performance of the proposed ZSI in terms of conversion ratio, voltage gain, and stresses on the power switches and capacitors is benchmarked with selected ZSIs. Finally, simulations and experimental tests substantiate the theoretical analysis and superior performance.

scholarly journals Novel High-Efficiency High Step-Up DC–DC Converter with Soft Switching and Low Component Voltage Stress for Photovoltaic System

Processes ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 1112
Author(s):  
Yu-En Wu ◽  
Jyun-Wei Wang
Keyword(s):  
High Voltage ◽  
Output Voltage ◽  
High Efficiency ◽  
Low Voltage ◽  
Leakage Inductance ◽  
Power Switch ◽  
Half Wave Voltage ◽  
Half Wave ◽  
Voltage Stress ◽  
Voltage Doubler

This study developed a novel, high-efficiency, high step-up DC–DC converter for photovoltaic (PV) systems. The converter can step-up the low output voltage of PV modules to the voltage level of the inverter and is used to feed into the grid. The converter can achieve a high step-up voltage through its architecture consisting of a three-winding coupled inductor common iron core on the low-voltage side and a half-wave voltage doubler circuit on the high-voltage side. The leakage inductance energy generated by the coupling inductor during the conversion process can be recovered by the capacitor on the low-voltage side to reduce the voltage surge on the power switch, which gives the power switch of the circuit a soft-switching effect. In addition, the half-wave voltage doubler circuit on the high-voltage side can recover the leakage inductance energy of the tertiary side and increase the output voltage. The advantages of the circuit are low loss, high efficiency, high conversion ratio, and low component voltage stress. Finally, a 500-W high step-up converter was experimentally tested to verify the feasibility and practicability of the proposed architecture. The results revealed that the highest efficiency of the circuit is 98%.

scholarly journals Modified Cascaded Z-Source High Step-Up Boost Converter

Electronics ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 1932
Author(s):  
Navid Salehi ◽  
Herminio Martínez-García ◽  
Guillermo Velasco-Quesada
Keyword(s):  
High Voltage ◽  
Boost Converter ◽  
Experimental Results ◽  
Input Current ◽  
Voltage Gain ◽  
Low Input ◽  
High Voltage Gain ◽  
Voltage Stress ◽  
Photovoltaic Applications ◽  
Current Ripple

To improve the voltage gain of step-up converters, the cascaded technique is considered as a possible solution in this paper. By considering the concept of cascading two Z-source networks in a conventional boost converter, the proposed topology takes the advantages of both impedance source and cascaded converters. By applying some modifications, the proposed converter provides high voltage gain while the voltage stress of the switch and diodes is still low. Moreover, the low input current ripple of the converter makes it absolutely appropriate for photovoltaic applications in expanding the lifetime of PV panels. After analyzing the operation principles of the proposed converter, we present the simulation and experimental results of a 100 W prototype to verify the proposed converter performance.

Maximum Boost Control for 7-level Z-source Cascaded H-Bridge Inverter

2017 ◽  
Vol 8 (2) ◽  
pp. 739
Author(s):  
R. Palanisamy ◽  
K. Vijayakumar
Keyword(s):  
Output Voltage ◽  
Single Phase ◽  
Boost Converter ◽  
Voltage Source ◽  
Constant Voltage ◽  
Harmonic Content ◽  
Duty Cycles ◽  
Voltage Stress ◽  
Power Switches ◽  
Boost Control

This paper proposes maximum boost control for 7-level z-source cascaded h-bridge inverter and their affiliation between voltage boost gain and modulation index. Z-source network avoids the usage of external dc-dc boost converter and improves output voltage with minimised harmonic content. Z-source network utilises distinctive LC impedance combination with 7-level cascaded inverter and it conquers the conventional voltage source inverter. The maximum boost controller furnishes voltage boost and maintain constant voltage stress across power switches, which provides better output voltage with variation of duty cycles. Single phase 7-level z-source cascaded inverter simulated using matlab/simulink.

scholarly journals Mathematical Modelling of High Voltage Gain Converter Using P and O for PV Based Application

2018 ◽  
Vol 225 ◽  
pp. 04002
Author(s):  
Arunkumari Thiyagu ◽  
V. Indragandhi ◽  
Ramani Kannan
Keyword(s):  
Mathematical Modelling ◽  
High Voltage ◽  
Output Voltage ◽  
High Efficiency ◽  
Load Condition ◽  
High Gain ◽  
Voltage Gain ◽  
Voltage Ripple ◽  
High Voltage Gain ◽  
Input Source

This manuscript proposes a novel single switch converter which attains high voltage gain using P and O algorithm. The proposed converter is multilevel with voltage tripler technique. Here the output voltage gain attained is 11 times than the input source. The voltage ripple attained is less compared to other models. The main advantage of the converter is high efficiency, reduced switch loss, high gain and reduction in ripple. The converter attains efficiency of 97.3% at full load condition. The proposed converter is analysed by both Simulink MATALAB and Hardware prototype.

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