scholarly journals A Novel Fundamental Frequency Switching Operation for Conventional VSI to Enable Single-Stage High-Gain Boost Inversion with ANN Tuned QWS Controller

Electronics ◽  
2021 ◽  
Vol 10 (20) ◽  
pp. 2499
Author(s):  
Prabhat R. Tripathi ◽  
V. Laxmi ◽  
Ritesh K. Keshri ◽  
Bhargav Appasani ◽  
Taha Selim Ustun
Keyword(s):  
Fundamental Frequency ◽  
High Frequency ◽  
Low Voltage ◽  
High Gain ◽  
Single Stage ◽  
Voltage Source ◽  
Passive Component ◽  
Resistive Load ◽  
Switching Operation ◽  
Dc Voltage

Single-stage high-gain inverters have recently gained much research focus as interfaces for inherent low voltage DC sources such as fuel cells, storage batteries, and solar panels. Many impedance-assisted inverters with different input stage configurations have been presented. To decrease passive component sizes, these inverters operate at high-frequency switching. The high-frequency switching optimizes the passive component sizes but introduces many challenges in the form of high-frequency inductor design, control complexity, high-frequency gate driver requirements, high semiconductor losses, and electromagnetic interferences. This article proposes a novel fundamental frequency switching operation for the conventional voltage source inverters (VSI) to operate as a single-stage high-gain inverter. As the novel operational strategy changes the behavior of conventional VSI from buck inverter to a boost inverter, it is hereafter termed as a novel inverter. By virtue of the operation strategy, switches withstand peak inverse voltage (PIV) equal to DC link voltage, unlike other impedance assisted boost inverters where PIV across switches is the amplified DC voltage. The proposed inverter can invert low-level DC voltage to high voltage AC with low total harmonic distortion (THD) in a single stage without the help of any external filter. A novel quarter-wave symmetric phase-shift controller is proposed for variable voltage and frequency control of proposed inverters tuned by a back-propagation thin-plate-spline neural network (BPTPSNN). Mathematical analysis with experimental validation is presented. Experimentation is carried out on a prototype of 2 kW for single-phase resistive load, induction motor, and non-linear loads.

scholarly journals Enhanced Performance Modified Discontinuous PWM Technique for Three-Phase Z-Source Inverter

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 578 ◽  
Author(s):  
Hossameldin ◽  
Abdelsalam ◽  
Ibrahim ◽  
Williams
Keyword(s):  
Current Source ◽  
Operating Conditions ◽  
Single Stage ◽  
Superior Performance ◽  
Voltage Source ◽  
Passive Component ◽  
Operating Range ◽  
Three Phase ◽  
Voltage Stress ◽  
Conversion Stage

Various industrial applications require a voltage conversion stage from DC to AC. Among them, commercial renewable energy systems (RES) need a voltage buck and/or boost stage for islanded/grid connected operation. Despite the excellent performance offered by conventional two-stage converter systems (dc–dc followed by dc–ac stages), the need for a single-stage conversion stage is attracting more interest for cost and size reduction reasons. Although voltage source inverters (VSIs) are voltage buck-only converters, single stage current source inverters (CSIs) can offer voltage boost features, although at the penalty of using a large DC-link inductor. Boost inverters are a good candidate with the demerit of complicated control strategies. The impedance source (Z-source) inverter is a high-performance competitor as it offers voltage buck/boost in addition to a reduced passive component size. Several pulse width modulation (PWM) techniques have been presented in the literature for three-phase Z-source inverters. Various common drawbacks are annotated, especially the non-linear behavior at low modulation indices and the famous trade-off between the operating range and the converter switches’ voltage stress. In this paper, a modified discontinuous PWM technique is proposed for a three-phase z-source inverter offering: (i) smooth voltage gain variation, (ii) a wide operating range, (iii) reduced voltage stress, and (iv) improved total harmonic distortion (THD). Simulation, in addition to experimental results at various operating conditions, validated the proposed PWM technique’s superior performance compared to the conventional PWM techniques.

A Regulated DC-DC Voltage Source Converter Using a High Frequency Link

1982 ◽  
Vol IA-18 (3) ◽  
pp. 279-287 ◽  
Author(s):  
V. T. Ranganathan ◽  
Phoivos D. Ziogas ◽  
Victor R. Stefanovic
Keyword(s):  
High Frequency ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Dc Voltage

A Single-Stage Square Wave Buck-Boost Inverter

2015 ◽  
Vol 793 ◽  
pp. 280-285
Author(s):  
J.A. Soo ◽  
N.A. Rahman ◽  
J.H. Leong
Keyword(s):  
Duty Cycle ◽  
Output Voltage ◽  
Boost Converter ◽  
Single Stage ◽  
Experimental Results ◽  
Voltage Source ◽  
Voltage Waveform ◽  
Boost Converters ◽  
Dc Voltage ◽  
Square Wave

This paper proposed a novel single-stage square wave buck-boost inverter (SWBBI). The proposed inverter is designed by using dual buck-boost converters. The input DC voltage of the proposed inverter can be either stepped-down or stepped-up in square output voltage waveform depending on the duty-cycle applied for each buck-boost converter. This characteristic is not found in conventional voltage source inverter where the output voltage is always lower than the input DC voltage. The proposed inverter is analyzed by a series of simulations using MATLAB/Simulink as well as experiments by using different values of duty-cycle. A conclusion about the feasibility of the proposed inverter is given by comparing the simulation and experimental results.

scholarly journals An Isolated High Voltage Boost Current-Fed DC–DC Converter Based on 1:1 Transformer Multiplier Cells and ZVS Operation

Electronics ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 102
Author(s):  
Abdulhakeem Alsaleem ◽  
Faleh Alsakran ◽  
Marcelo Godoy Simões
Keyword(s):  
High Frequency ◽  
Output Voltage ◽  
Low Voltage ◽  
Voltage Source ◽  
Design Guideline ◽  
Zero Voltage Switching ◽  
Voltage Stress ◽  
Zero Voltage ◽  
Laboratory Prototype ◽  
Voltage Switching

This paper presents a high step up, current fed, interleaved, isolated DC–DC converter with voltage multipliers and ZVS (zero voltage switching). The converter provides zero voltage switching for all active switches and provides a high step up voltage gain that is suitable for very low voltage source applications, such as PV and other renewable sources. In addition, this converter allows the utilization of very low voltage stress switches and diodes. It reduces the current stress by interleaving the input current, and reduces the voltage stress by utilizing a half bridge based multiplier cell integrated configuration at the output voltage while providing high frequency galvanic isolation. The isolation is achieved through the use of 1:1 transformers which are easier to design, and the need for a high turns ratio is absent in this converter. The main theory of operation and the design guideline are presented, as is a laboratory prototype, all to validate the concept.

scholarly journals Analysis of Symmetric Dual Switch Converter under High Switching Frequency Conditions

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 2183
Author(s):  
Yu Tang ◽  
Dekai Kong ◽  
Haisheng Tong
Keyword(s):  
High Frequency ◽  
Low Voltage ◽  
Low Frequency ◽  
High Gain ◽  
Operating Conditions ◽  
Switching Frequency ◽  
Operating Characteristics ◽  
Frequency Condition ◽  
High Switching Frequency ◽  
Parasitic Parameters

Electric vehicle batteries have the problem of low output voltage, so the application of a high-gain converter is a research hotspot. The symmetrical dual-switch high gain converter has the merits of simple structure, low voltage and current stress, and low EMI. Due to the deterioration of circuit performance caused by circuit parasitic parameters under high frequency operating conditions, the former analysis under low frequency condition cannot satisfy the requirements for performance evaluation. To clarify whether the symmetrical dual-switch high-gain converter can maintain its operating characteristics under high-frequency operating conditions, this paper establishes the converter model considering parasitic parameters, and deduces the sneak circuit modes at high frequency. The effects of parasitic parameters at high frequency on voltage gain, switch stress, and symmetrical operating are analyzed, which is beneficial for the selection and optimization of power devices. This paper believes that considering parasitic parameters may reduce the output gain of the symmetrical double-switch high-gain converter considering parasitic parameters under high frequency conditions, increase the switching stress, and affect the symmetry of the circuit operation when the parasitic parameter values are different. Finally, an experimental platform rated on 200 W with 200 kHz switching frequency is established, and experimental verification is given to verify the analysis.

scholarly journals A High Gain AC-DC Rectifier Based on Current-Fed Cockcroft-Walton Voltage Multiplier for Motor Drive Applications

2021 ◽  
Vol 13 (21) ◽  
pp. 12317
Author(s):  
Ahmad Zarepour ◽  
Amirhossein Rajaei ◽  
Hooman Mohammadi-Moghadam ◽  
Mahdi Shahparasti
Keyword(s):  
Power Factor ◽  
High Frequency ◽  
Low Voltage ◽  
Frequency Converter ◽  
Input Voltage ◽  
High Gain ◽  
Motor Drive ◽  
Voltage Multiplier ◽  
Drive Systems ◽  
Switching Method

This paper proposes a novel high-gain AC-DC converter based on the Cockcroft–Walton (CW) voltage multiplier which can be utilized in motor drive systems with low input voltage. In this topology, use of the voltage multiplier and boost circuit results in the increment of converter gain which has a significant impact on the cost and efficiency of the system. Moreover, in this converter, the AC voltage is directly changed to DC voltage using the switching method in high frequency and, as well, the power factor is corrected. Besides, this high-frequency converter contributes to the reduction of output ripple. On the other hand, cost efficiency, the low voltage stress on capacitors and diodes, compactness, and the high voltage ratio, are achieved from the Cockcroft–Walton circuit. Furthermore, the hysteresis method is presented for converter switching to correct the power factor. The converter is simulated in MATLAB software to demonstrate the effectiveness of the suggested method. Lastly, a laboratory prototype of the suggested converter is built, several tests are done in order to verify the theoretical analysis, and comprehensive comparison with the state-of-the-art converter is done.

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