A transformerless high gain dc–dc boost converter with reduced voltage stress

High gain DC-DC converters are increasingly being used in solar PV and other renewable generation systems. Satisfactory steady-state and dynamic performance, along with higher efficiency, is a pre-requirement for selecting the converter for these applications. In this paper, a non-inverting high gain DC-DC boost converter has been proposed. The proposed converter has only one switch with continuous input current and reduced voltage stress across switching devices. The operating range of the duty cycle is wider, and it obtains a higher gain at a lower value of the duty cycle. Moreover, the converter has higher efficiency at a lower duty cycle while drawing a continuous input current. The continuous input current is a desirable feature of the dc-dc converter making it suitable for solar photovoltaic applications. The converter’s operation has been discussed in detail and extended to include the real circuit parameters for a practical performance evaluation. The proposed converter has been compared with other similar recently proposed converters on various performance parameters. The loss analysis for the proposed converter has also been carried out. Finally, the simulation has been validated with results from the experimental prototype.

/pdf/a-non-inverting-high-gain-dc-dc-converter-with-continuous-1e6jjqrefv.pdf

A Non-Inverting High Gain DC-DC Converter With Continuous Input Current

High gain dc-dc converters are used in several applications which include solar photovoltaic system, switch-mode power supplies and fuel cells. In this paper, an ultra-high gain dc-dc boost converter is proposed and analyzed in detail. The converter has a gain of six times as compared with the boost converter. The high gain is achieved by utilizing switched inductors and switched capacitors. A modified voltage multiplier cell (VMC) with switched inductors is proposed. The converter has a single switch which makes its operation easy. Moreover, the voltage across the switch, diodes and capacitors are less than the output voltage which increases the overall efficiency of the converter. The converter performance in steady-state is analyzed in detail and it is compared with other latest high gain converters. The working of the converter in non-ideal conditions is also discussed in detail. The loss analysis is done using PLECS software by incorporating the real models of switches and diodes from the datasheet. To confirm and validate the working of the proposed converter a hardware prototype of 200 W is developed in the laboratory. The converter achieves high gain at low duty ratios and its performance is found to be good in open and closed loop conditions.

/pdf/a-new-transformerless-ultra-high-gain-dc-dc-converter-for-dc-2jl5r0g00c.pdf

A New Transformerless Ultra High Gain DC–DC Converter for DC Microgrid Application

This paper presents a novel topology for the single-phase 31-level asymmetrical multilevel inverter accomplished with reduced components count. The proposed topology generates maximum 31-level output voltage with asymmetric DC sources with an H-bridge. The fundamental 13-level multilevel inverter (MLI) topology is realized, and further, the topology is developed for 31-level can be used for renewable energy applications. This reduces the overall components count, cost and size of the system. Rather than the many advantages of MLIs, reliability issues play a significant role due to higher components count to reduce THD. This is a vital challenge for the researchers to increase the reliability with less THD. Several parameters are analyzed for both fundamental 13-level and developed 31-level MLIs such as total standing voltage (TSV), cost function (CF) and power loss. The inverter is tested experimentally with various combinational loads and under dynamic load variations with sudden load disturbances. Total standing voltage with the cost function for the proposed MLI is compared with various topologies published recently and is cost-effective. A detailed comparison of several parameters with graphical representation is made. Less TSV and components requirement is observed for the proposed MLI. The obtained total harmonic distortion (THD) is under IEEE standards. The topology is simulated in MATLAB/Simulink and verified experimentally with a hardware prototype under various conditions.

/pdf/design-and-implementation-of-31-level-asymmetrical-inverter-3j7b3b889r.pdf

Design and Implementation of 31-Level Asymmetrical Inverter With Reduced Components

The growth of renewable energy in the last two decades has led to the development of new power electronic converters. The DC microgrid can operate in standalone mode, or it can be grid-connected. A DC microgrid consists of various distributed generation (DG) units like solar PV arrays, fuel cells, ultracapacitors, and microturbines. The DC-DC converter plays an important role in boosting the output voltage in DC microgrids. DC-DC converters are needed to boost the output voltage so that a common voltage from different sources is available at the DC link. A conventional boost converter (CBC) suffers from the problem of limited voltage gain, and the stress across the switch is usually equal to the output voltage. The output from DG sources is low and requires high-gain boost converters to enhance the output voltage. In this paper, a new high-gain DC-DC converter with quadratic voltage gain and reduced voltage stress across switching devices was proposed. The proposed converter was an improvement over the CBC and quadratic boost converter (QBC). The converter utilized only two switched inductors, two capacitors, and two switches to achieve the gain. The converter was compared with other recently developed topologies in terms of stress, the number of passive components, and voltage stress across switching devices. The loss analysis also was done using the Piecewise Linear Electrical Circuit Simulation (PLCES). The experimental and theoretical analyses closely agreed with each other.

https://www.mdpi.com/1996-1073/14/9/2629/pdf

A New High-Gain DC-DC Converter with Continuous Input Current for DC Microgrid Applications

This paper presents a new single-stage, nonisolated dc to dc boost converter with quadratic voltage gain for low and medium power applications. The attractive features of the topology are that it i...

A New Transformerless Quadratic Boost Converter with High Voltage Gain

DC Microgrid has got attention due to wide use of DC energy sources. For this purpose, high gain boost converter is proposed. Modified switched inductor is used to boost the output voltage at the load. Compared with the traditional boost converter the converter has high voltage gain. The converter has two switches and is operated using single control reducing the complexity of the circuit. The steady state analysis in continuous conduction mode (CCM) and discontinuous conduction mode (DCM) is elaborated. Further, the comparison is made with similar topologies. Loss analysis and effect on the efficiency of the converter by considering the non-idealities is detailed in the paper theoretically. Simulation is carried on PLECs software. Theoretical results and simulation study are in agreement with each other.

Mohammad Zaid

Papers

A transformerless high gain dc–dc boost converter with reduced voltage stress

A Non-Inverting High Gain DC-DC Converter With Continuous Input Current

A New High-Gain DC-DC Converter with Continuous Input Current for DC Microgrid Applications

A New Transformerless Quadratic Boost Converter with High Voltage Gain

Improved Dual Switch Non-Isolated High Gain Boost Converter for DC microgrid Application