Journal ArticleDOI
A Single-Phase Transformer-Less Grid-Tied Inverter Based on Switched Capacitor for PV Application
TLDR
A transformer-less grid-tied single-phase inverter is proposed which is directly connected to the grid, without any output filter, leading to elimination of the losses caused by the filter and increased efficiency.Abstract:
In this paper, a transformer-less grid-tied single-phase inverter is proposed which is directly connected to the topology. The voltage across the leakage capacitor has the base frequency, which decreases the leakage current under the defined value in the standards. This inverter’s active switches are high- and low-frequency types. High-frequency switches control the inductor’s current. In addition, the low-frequency switches are synchronous with the grid and operate in the base frequency. Since no power electrolytic decoupled capacitor is utilized between the high- and low-frequency switches, the system’s total efficiency and lifespan are improved. The proposed inverter has the capability of stepping up/down the output voltage, making it suitable for operating in a wide range of voltages and also providing large range of powers to the grid. This topology is directly connected to the grid, without any output filter, leading to elimination of the losses caused by the filter and increased efficiency. In the proposed inverter, a digital current controller is employed to control the injected current to the grid. Furthermore, P&O algorithm is adapted to extract the maximum power from the input source. For proving the proposed converter’s performance, a 770-W prototype has been implemented and comprehensive experimental results are presented.read more
Citations
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Journal ArticleDOI
Computer-aided diagnosis of skin cancer based on soft computing techniques
TL;DR: An automatic computer-aided method for the early diagnosis of skin cancer using the convolutional neural network optimized by satin bowerbird optimization (SBO) has been presented and its efficiency has been indicated by the confusion matrix.
Journal ArticleDOI
Optimal parameter identification of PEMFC stacks using Adaptive Sparrow Search Algorithm
Yanlong Zhu,Nasser Yousefi +1 more
TL;DR: The proposed ASSA is utilized for minimizing the sum of squared error (SSE) between the empirical stack voltage and the calculated stack voltage by optimal selection of the mentioned parameters in the PEMFC stack.
Journal ArticleDOI
A new technique for optimal estimation of the circuit-based PEMFCs using developed Sunflower Optimization Algorithm
TL;DR: A newly developed model of the Sunflower Optimization Algorithm (DSFO) is proposed for minimizing the sum of squared error (SSE) value between the estimated and the actual output voltage of the PEMFC stack.
Journal ArticleDOI
A multi-objective home energy management system based on internet of things and optimization algorithms
TL;DR: A new optimal method for home energy management system based on the internet of things based on ZigBee, based on a new improved version of the butterfly algorithm for increasing the convergence speed and user satisfaction is presented.
Journal ArticleDOI
Model parameter estimation of the PEMFCs using improved Barnacles Mating Optimization algorithm
TL;DR: In this article, a new optimal method is proposed to select unknown parameters of the proton exchange membrane fuel cell (PEMFC) models based on minimizing the sum of squared error (SSE) value between the experimental output voltage and the estimated output voltage for the PEMFC stack.
References
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Journal ArticleDOI
A review of single-phase grid-connected inverters for photovoltaic modules
TL;DR: In this article, the authors focus on inverter technologies for connecting photovoltaic (PV) modules to a single-phase grid and categorize the inverters into four classifications: 1) the number of power processing stages in cascade; 2) the type of power decoupling between the PV module(s) and the single phase grid; 3) whether they utilizes a transformer (either line or high frequency) or not; and 4) the kind of grid-connected power stage.
Journal ArticleDOI
A New High-Efficiency Single-Phase Transformerless PV Inverter Topology
TL;DR: This paper proposes a new topology, based on the H-bridge with a new ac bypass circuit consisting of a diode rectifier and a switch with clamping to the dc midpoint, which achieves high conversion efficiency and low leakage current.
Journal ArticleDOI
The active NPC converter and its loss-balancing control
T. Bruckner,S. Bernet,H. Guldner +2 more
TL;DR: A loss-balancing scheme is introduced, enabling a substantially increased output power and an improved performance at zero speed, compared to the conventional NPC VSC.
Journal ArticleDOI
Transformerless Single-Phase Multilevel-Based Photovoltaic Inverter
TL;DR: A new high-efficiency topology for transformerless systems is proposed, which does not generate common-mode currents and topologically guarantees that no dc is injected into the grid and has been verified in a 5-kW prototype with satisfactory results.
Journal ArticleDOI
Improved Transformerless Inverter With Common-Mode Leakage Current Elimination for a Photovoltaic Grid-Connected Power System
TL;DR: In this article, an improved single-phase inverter topology is presented to eliminate the common-mode leakage current in the transformerless photovoltaic grid-connected system, and the high efficiency and convenient thermal design are achieved thanks to the decoupling of two additional switches connected to the dc side.