Effect of System Grounding, AC-DC Converter Topology and Inverter Modulation on Motor Insulation Voltage Stress

2020 ◽  
Author(s):  
G. Y. Sizov ◽  
Z. Vrankovic ◽  
M. J. Melfi ◽  
G. L. Skibinski ◽  
Zhijun Liu
Keyword(s):  
Voltage Stress ◽  
Converter Topology

scholarly journals Design and implementation of multilevel non-isolated DC-DC converter for variable DC voltage source

2021 ◽  
Vol 12 (2) ◽  
pp. 994
Author(s):  
Ali Ahmed Adam Ismail ◽  
A. Elnady
Keyword(s):  
Power Converter ◽  
Buck Converter ◽  
Voltage Source ◽  
Stable Operation ◽  
Multilevel Converter ◽  
Medium Voltage ◽  
Voltage Stress ◽  
Filter Size ◽  
Converter Topology ◽  
Lc Filter

<span lang="EN-US">In this paper, a non-isolated multi-level DC-DC (MLDC-DC) smooth buck converter with the LC filter is designed and analyzed. The presented topology can be used in low or medium voltage levels in several applications that use DC storage elements. The use of the proposed multilevel converter topology reduces the voltage stress across the power converter switching elements and facilitates the voltage rating of the switches. The designed LC filter for the multilevel converter is characterized by a small inductor size, which reduces the traditional bulky inductor used in the output of the traditional DC-DC converter. The reduction in the filter size is proportional to the number of the connected voltage sources, it works effectively to reduce ripple in the load currents, and it increases the voltage gain. The intensive analysis of the converter system and the experimental results show a stable operation of the proposed converter with precise output voltage.</span>

scholarly journals Three-Phase Three-Level Isolated DC-DC Soft Switching Converter For Solar Applications

2021 ◽  
Vol 9 (2) ◽  
pp. 443-451
Author(s):  
K.Girinath Babu, Et. al.
Keyword(s):  
Input Voltage ◽  
Soft Switching ◽  
Leakage Inductance ◽  
Switching Converter ◽  
Three Phase ◽  
Voltage Stress ◽  
Converter Topologies ◽  
Total Leakage ◽  
Converter Topology ◽  
Output Filter

Three-level isolated DC-DC converter is an attractive topology in high input voltage applications, which can provide the voltage stress of the power devices to only a half of the dc voltage and also reduce the size of dc filter requirement. But major limitations in the existing three level ZVS converter topologies are brought out with an increased inductance in the primary side and it required to provide complete ZVS of all primary devices down to light loads. By employing an external inductance in the primary of the transformer, total leakage inductance of the transformer increases which is required for realization of soft switching of the converter switches but there are some disadvantages of connecting external inductance in the primary of the transformer. To overcome all these drawbacks, the     three-phase three-level isolated DC-DC soft switching converter has been proposed in order to reduce voltage and current stresses. This converter topology requires less number of control switches and operates with an asymmetrical duty cycle control. The proposed three level DC-DC converters provide two- level voltage waveform before dc output filter, which significantly reduce the size of dc output filter. The proposed work has been implemented using MATLAB/SIMULINK and the performance of the proposed converter is verified through simulation results.  

A Voltage Multiplier Based High Voltage Gain Transformerless Buck–Boost DC–DC Converter

2018 ◽  
Vol 27 (12) ◽  
pp. 1850188 ◽  
Author(s):  
Hossein Ajdar Faeghi Bonab ◽  
Mohamad Reza Banaei ◽  
Navid Taghizadegan Kalantari
Keyword(s):  
High Voltage ◽  
Boost Converter ◽  
Voltage Gain ◽  
Power Switch ◽  
High Voltage Gain ◽  
Voltage Stress ◽  
Converter Topology ◽  
Mathematical Analyses ◽  
State Resistance ◽  
Switch Voltage

In this paper, a new transformerless buck–boost converter is introduced. The proposed converter voltage gain is higher that of the conventional buck–boost converter. In the presented converter, only one power switch is used. The switch voltage stress is low, therefore, the low on-state resistance of the power switch can be selected to decrease losses of the switch. The presented converter topology is simple, hence the control of the converter will be simple. The mathematical analyses and principle of the proposed converter are explained. The validity of the proposed converter is confirmed by the experimental results.

scholarly journals High Gain and Reduced Switch Stress DC-DC Converter Topology for PV System

2018 ◽  
Vol 7 (04) ◽  
pp. 23808-23816
Author(s):  
C. Srideepa ◽  
S.Sathish Kumar ◽  
R. Nagarajan
Keyword(s):  
High Gain ◽  
Photovoltaic System ◽  
Voltage Gain ◽  
Pv System ◽  
Power Switch ◽  
High Voltage Gain ◽  
Voltage Stress ◽  
Converter Topology ◽  
State Resistance ◽  
Two Hybrid

This paper presents a new high step-up isolated DC-DC converter topology for photovoltaic system. The suggested configuration provides a converter with high voltage gain and reduced switch stress by using three coupled inductor with two hybrid voltage multiplier cell. The operation of the proposed converter is based on a charging capacitor with a single switch in its structure. A passive clamp circuit composed of capacitors and diodes is employed in the converter structure for lowering the voltage stress on the power switch as well as increasing the voltage gain of the converter. Since the voltage stress is low in the provided topology, a switch with a small ON-state resistance can be used. As a result, the losses are decreased and the efficiency is increased. The design of DC-DC boost converter is also discussed in detail. Simulation of DC-DC converter is performed in MATLAB/Simulink and the result are verified

Analysis and Evaluation of Performance Parameters of Modified Single Ended Primary Inductance Converter

2017 ◽  
Vol 8 (4) ◽  
pp. 1585
Author(s):  
Hemalatha J N ◽  
Hariprasad S A ◽  
Anitha G S
Keyword(s):  
Performance Parameters ◽  
Zero Voltage Switching ◽  
Analysis And Evaluation ◽  
Evaluation Of Performance ◽  
Zero Current Switching ◽  
Zero Current ◽  
Voltage Stress ◽  
Input Source ◽  
Converter Topology ◽  
Zero Voltage

<p><span>The objective of this paper is to propose a modified Single Ended Primary Inductance converter topology with passive lossless snubber cell to achieve Zero Voltage Switching (ZVS) of the device near turn off and Zero Current Switching (ZCS) near turn on. By using the snubber cell effectively with the converter reduces the switching stress by restricting the large variations in voltage and current. The detailed analysis of the circuit with relevant waveforms of the circuit is described. The circuit is designed for a load of 100W at 12V output from an input source ranging between 20-30V. The circuit is modelled in MATLAB Simulink platform and the parameters are compared with conventional circuit. From the results it is shown that the proposed circuit operates at a lesser voltage stress and at higher efficiency than conventional one.</span></p>

Non-Isolated High Step Up in Voltage DC–DC Converter Topology for Renewable Applications

2020 ◽  
pp. 2150093
Author(s):  
Pavan Prakash Gupta ◽  
G. Indira Kishore ◽  
Ramesh Kumar Tripathi
Keyword(s):  
High Voltage ◽  
Switching Frequency ◽  
Resistive Load ◽  
Voltage Gain ◽  
Boost Converters ◽  
High Voltage Gain ◽  
Voltage Stress ◽  
Power Switches ◽  
Converter Topologies ◽  
Converter Topology

In the class of the boost converters, the conventional DC–DC boost converters are in common practice but their limited boost capabilities at higher duty ratios are one of the concerns. The isolated and non-isolated step-up DC–DC converters are one of the remedies of the above issue. The presence of switched inductor and switched capacitors in the circuit of non-isolated configuration can provide considerable step-up in voltage at the output, and also facilitate lower voltage stress on components. In this paper, work has been done to propose three non-isolated high-voltage gain DC–DC boost converter topologies. Along with the high voltage gain, the topologies also have lesser voltage stress across the active power switches and diodes used in topologies. The proposed topologies are suitable for low dc input levels like renewable sources, microgrid and grid-connected applications. A Matlab/Simulink 2017a environment is utilized to derive, design and simulate the proposed topologies for a 100-W load operation. The basic topology is also realized in hardware as a prototype circuit with 100-W resistive load, operated at 50[Formula: see text]kHz switching frequency.

scholarly journals Design of New High Step-Up DC-DC Converter Topology for Solar PV Applications

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Shanthi Thangavelu ◽  
Prabha Umapathy
Keyword(s):  
Low Voltage ◽  
High Gain ◽  
Performance Comparison ◽  
Duty Ratio ◽  
Voltage Gain ◽  
Solar Pv ◽  
High Voltage Gain ◽  
Voltage Stress ◽  
Converter Topologies ◽  
Converter Topology

A new topology for high step-up nonisolated DC-DC converter for solar PV applications is presented in this paper. The proposed high-voltage gain converter topology has many advantages like low-voltage stress on the switches, high gain with low duty ratio, and a continuous input current. The analytical waveforms of the proposed converter are presented in continuous and discontinuous modes of operation. Voltage stress analysis is conducted. The voltage gain and efficiency of the converter in presence of parasitic elements are also derived. Performance comparison of the proposed high-gain converter topology with the recently reported high-gain converter topologies is presented. Validation of theoretical analysis is done through the test results obtained from the simulation of the proposed converter. For the maximum duty ratio of 80%, the output voltage of 670 V is observed, and the voltage gain obtained is 14. Comparison of theoretical and simulation results is presented which validates the performance of the proposed converter.

scholarly journals A new asymmetric cascaded multilevel converter topology with reduced voltage stress and number of switches

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Rahim Samanbaksh ◽  
Federico M. Ibanez ◽  
Peyman Koohi ◽  
Fernando Martin
Keyword(s):  
Multilevel Converter ◽  
Voltage Stress ◽  
Converter Topology

scholarly journals Non-isolated Modified Quadratic Boost Converter with Midpoint Output for Solar Photovoltaic Applications

2019 ◽  
Vol 87 ◽  
pp. 01025
Author(s):  
Shanmugasundaram Ravivarman ◽  
Karuppiah Natarajan ◽  
Reddy B Raja Gopal
Keyword(s):  
High Gain ◽  
Boost Converter ◽  
Solar Photovoltaic ◽  
Photovoltaic Panels ◽  
Operating Modes ◽  
Voltage Stress ◽  
Photovoltaic Applications ◽  
Current Conduction ◽  
Continuous Current ◽  
Converter Topology

This paper presents a boost DC-DC converter topology with non - isolated high gain and output midpoint, to boost the voltage obtained from solar photovoltaic panels. The three-level boost converter is coupled to the output port of the single-switch quadratic boost converter to derive the proposed converter topology. The voltage gain of the proposed converter is greater than that of the classical boost converter. The voltage stress on the switches of the proposed converter is equal to half of the converter output voltage. Static analysis, operating modes, experimental waveforms in continuous current conduction and discontinuous current conduction modes are shown. A 520 W prototype converter was implemented in the laboratory and its results are presented.

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