Single Phase Bidirectional H6 Rectifier/Inverter

Wang, Jianhua; Gao, Shang; Sun, Yifei; Ji, Zhendong; Cheng, Lexiang; Li, Lingyu; Gu, Wei; Zhao, Jianfeng

doi:10.1109/tpel.2019.2897318

Cited by 17 publications

(6 citation statements)

References 25 publications

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“…The projected method performance analysis is simulated, Various switches were employed and the pulses are evaluated in terms of ON and OFF state condition and the outcomes are illustrated in the graphical form as shown: Table 1 is the comparative analysis of the THD values in terms of both proposed and existing [15] techniques. The evaluation of the performance of total harmonic distortion is signified and represented in the output waveform shown above.…”

Section: Figure 4 Hardware Prototype Modelmentioning

confidence: 99%

Efficient flyback converter with h6 inverter using mathematical modelling of smfo for performance improvement in grid connected pv system

Saravanakumar¹,

Arulmozhiyal²

2021

DSA

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The proposed flyback inverter controlled by Stochastic Moth Flame Optimization-based maximum power point tracking (MPPT) converter for the small photovoltaic (PV) power system. The system of small PV could be connected easily in a parallel manner for yielding higher output power. Once a power system PV is being constructed with the small power system, the cost of entire system will enhance and this will be matter of concern. So as to overcome this issue, this approach presents a PV system which in turn employs no expensive DC sensor however employs the technique for the estimation of PV current from PV voltage source. The foremost intention of using mathematical formulation based stochastic moth flame optimization is to boost and optimize the PV input. The optimized source input may be helpful for varying the duty cycle based on maximum power point tracking, at which the optimal range of duty cycle is optimized at each iteration and the optimal range will be taken for pulse generation. Also, the fly back converter is one such DC-DC converter having high level of frequency and is employed in low power application. Due to this high-frequency function, losses and stresses of switching will be more. For reducing the losses and stresses of the interleaved flyback converter is presented. Therefore, the presented system is better for dynamic system application. In the grid-connected system, the leakage current is one of the major shortcomings and to evade this limitation, H6 inverter type is employed. By this H6 inverter advantage and fly back converter benefit, this approach mainly concentrates on the stresses over the switches and thus eradicating the leakage current and thereby reducing the Harmonics level.

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Section: Figure 4 Hardware Prototype Modelmentioning

confidence: 99%

Efficient flyback converter with h6 inverter using mathematical modelling of smfo for performance improvement in grid connected pv system

Saravanakumar¹,

Arulmozhiyal²

2021

DSA

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“…Some CSI topologies have been shown in recent research [72][73][74]. Nowadays, CSI topologies try to reduce the leakage current, such as H5 [75], H6 [76] and HERIC [77].…”

Section: H5 H6 and Heric Invertersmentioning

confidence: 99%

“…Despite the advantages mentioned in the previous topology, the H6 topology is the only one that has bidirectional capability [82]. In Reference [76], an unusual topology is shown whose challenge is to find an efficient solution to the bidirectionality of this type. As a result, the research uses a hybrid modulation strategy, both for the rectifier and the inverter.…”

Section: H5 H6 and Heric Invertersmentioning

confidence: 99%

Leakage Current Reduction in Single-Phase Grid-Connected Inverters—A Review

et al. 2020

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The rise in renewable energy has increased the use of DC/AC converters, which transform the direct current to alternating current. These devices, generally called inverters, are mainly used as an interface between clean energy and the grid. It is estimated that 21% of the global electricity generation capacity from renewable sources is supplied by photovoltaic systems. In these systems, a transformer to ensure grid isolation is used. Nevertheless, the transformer makes the system expensive, heavy, bulky and reduces its efficiency. Therefore, transformerless schemes are used to eliminate the mentioned disadvantages. One of the main drawbacks of transformerless topologies is the presence of a leakage current between the physical earth of the grid and the parasitic capacitances of the photovoltaic module terminals. The leakage current depends on the value of the parasitic capacitances of the panel and the common-mode voltage. At the same time, the common-mode voltage depends on the modulation strategy used. Therefore, by the manipulation of the modulation technique, is accomplished a decrease in the leakage current. However, the connection standards for photovoltaic inverters establish a maximum total harmonic distortion of 5%. In this paper an analysis of the common-mode voltage and its influence on the value of the leakage current is described. The main topologies and strategies used to reduce the leakage current in transformerless schemes are summarized, highlighting advantages and disadvantages and establishing points of comparison with similar topologies. A comparative table with the most important aspects of each converter is shown based on number of components, modes of operation, type of modulation strategy used, and the leakage current value obtained. It is important to mention that analyzed topologies present a variation of the leakage current between 0 to 180 mA. Finally, the trends, problems, and researches on transformerless grid-connected PV systems are discussed.

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“…High accuracy measurement and control, and high-speed performance are approved features of such devices [7]. Today, with the proposed new methods in digital control and protection areas, the capability of the power system is increased [8]. Now some questions may be raised, for instance, is a high speed multi task protection system with minimum components and cost feasible?…”

Section: Introductionmentioning

confidence: 99%

A New Multifunctional Protection System for Reducing Fault Current, Ferroresonance Overvoltage, and Voltage Fluctuations in Power Networks

Bashoo

Jazaeri

2022

International Transactions on Electrical Energy Systems

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This paper introduces a multifunctional protective system to mitigate more likely threats in power networks. The proposed device can cope with short circuit current, voltage sag, or swell and dangerous overvoltages due to ferroresonance by elaborate switching in its unified structure. The switching is in fact the main key for playing among the functions and altering the structure. Since the switches receive the control system’s commands based on what happens in the network, an intelligent controller has to be designed to interpret four operating modes and activate the correct function. Following the activation command, the structure is customized through switching action and the network is equipped with the corresponding protection function. The proposed scheme by employing minimum components and therefore achieving significant saving in costs can meet all expectations satisfactorily. Moreover, the control system’s performance is examined by a set of numerical simulations in a Matlab/Simulink environment. The obtained results show that the proposed device is feasible and successfully performs all three functions independently.

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Single Phase Bidirectional H6 Rectifier/Inverter

Cited by 17 publications

References 25 publications

Efficient flyback converter with h6 inverter using mathematical modelling of smfo for performance improvement in grid connected pv system

Efficient flyback converter with h6 inverter using mathematical modelling of smfo for performance improvement in grid connected pv system

Leakage Current Reduction in Single-Phase Grid-Connected Inverters—A Review

A New Multifunctional Protection System for Reducing Fault Current, Ferroresonance Overvoltage, and Voltage Fluctuations in Power Networks

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