Research on the Filters for Dual-Inverter Fed Open-End Winding Transformer Topology in Photovoltaic Grid-Tied Applications

Wang, Baoji; Zhang, Xing; Song, Chao; Cao, Renxian

doi:10.3390/en12122338

Cited by 6 publications

(3 citation statements)

References 29 publications

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“…Hence, it is considered as more appropriate for medium-voltage PV systems [52]. One of the proposed topologies that has been extensively studied uses two three-phase, two-level VSIs [53][54][55][56]. In this topology, the PV panels are divided by the two inverters.…”

Section: Introductionmentioning

confidence: 99%

Compensation of Unbalanced Low-Voltage Grids Using a Photovoltaic Generation System with a Dual Four-Leg, Two-Level Inverter

et al. 2022

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In this paper, a grid-connected photovoltaic (PV) generation system is proposed with the purpose of providing support to low-voltage grids, namely through the elimination or attenuation of the grid imbalances. This compensation must consider the load types, which can be either linear or non-linear, and whether the reactive power and current harmonics generated by the non-linear loads need to be compensated in addition to the unbalanced active power. This must be well considered, since the compensation of all aspects requires oversized PV inverters. Thus, the different unbalanced compensation schemes are addressed. Several schemes for the generation of the inverter current references taking into consideration the compensation and load type are presented. For this PV generation system, a dual four-leg, two-level inverter is proposed. It provides full unbalanced compensation owing to the fourth leg of the inverter and also extends the AC voltage, which is important when this compensation is required. To control this inverter, a control scheme for the inverter that considers several compensation factors is proposed. A vector voltage modulator associated with the controller is another aspect that is addressed in the paper. This modulator considers the balance between the DC voltages of the inverters. Several compensation schemes are verified through computational tests. The results validate the effectiveness of the proposed PV generation system.

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Section: Introductionmentioning

confidence: 99%

Compensation of Unbalanced Low-Voltage Grids Using a Photovoltaic Generation System with a Dual Four-Leg, Two-Level Inverter

et al. 2022

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“…From these, the ones that have received more attention are the dual three-phase H-bridge voltage source multilevel inverters. Among the several topologies the designated dual inverter is the most studied [22][23][24]. This topology consists into two Hbridges voltage source inverters supplied by two independent voltage source inverters.…”

Section: Introductionmentioning

confidence: 99%

A Vector Voltage Modulator for a Dual Inverter with a Floating Bridge to Operate in Normal and Fault Tolerant Mode

Pires

Foito

Cordeiro

et al. 2021

2021 10th International Conference on Renewable Energy Research and Application (ICRERA)

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“…In [11], the higher harmonics filters of on-grid inverters and their possible design were studied in order to optimize the operation parameters. The design of the passive higher harmonics filter of the on-grid inverter current allows reducing the level of output signal distortion only within the rated or close to the rated parameters, where an important factor is the load factor of the converter.…”

mentioning

confidence: 99%

Increasing the energy efficiency of modes of distribution networks with photovoltaic stations

Lutsenko¹,

Rukhlova²,

Kyrychenko³

et al. 2023

Nauk. visn. nat. hirn. univ.

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Purpose. Establishing the regularities of changes in influence of power quality indicators caused by the operating modes of photovoltaic (PV) station inverters on the operating modes of distribution networks’ equipment to improve their energy efficiency by reducing power losses. Methodology. To solve the scientific problems, the following methods are used such as: the method of harmonic analysis (Fourier integral); decomposition of the current spectrum by amplitude-frequency component using Mdaq-14 hardware and software platforms and LabVIEW software; the method of data correlation analysis to determine the higher harmonic current dependence on the load of an on-grid inverter; mathematical and physical modeling in the development of a way to improve the energy efficiency of on-grid inverters of PV stations. Findings. The conducted studies on electromagnetic compatibility indicators of grid photovoltaic station inverters in stationary and dynamic operation modes made it possible to establish the characteristic regularities of changes in the spectrum and amplitudes of higher harmonic components depending on the level of inverter loading. Hyperbolic dependences of the change in the sinusoidal signal distortion coefficients of the harmonic component on the level of inverter loading were experimentally established. A method has been developed for reducing the electromagnetic interference levels caused by photovoltaic station converters by implementing a circuit solution and algorithm for loading on-grid inverters in non-stationary modes in order to improve their electromagnetic compatibility and increase the energy efficiency of distribution networks with appropriate decentralized sources. Originality. The regularities are established of influence of the operating mode’s parameters of photovoltaic station inverters on the indicators of electromagnetic compatibility in their power supply system, including taking into account special circuit solutions, which allows increasing the energy efficiency of distribution network modes. Practical value. The method for reducing the electromagnetic interference levels generated by photovoltaic station inverters by implementing the proposed circuit solution and algorithm for loading the on-grid inverters in non-stationary modes is universal and can be applied to any photovoltaic station. This will help to reduce the power losses and electromagnetic damage to equipment from the action of higher harmonic components. Granting the established regularities of higher harmonics influence will allow one to take into account the impact of the relevant indicators on the additional insulation heating of power supply system elements and to assess the corresponding electromagnetic damage, to provide recommendations for consideration of the modes in calculating methods and PV equipment selection.

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Research on the Filters for Dual-Inverter Fed Open-End Winding Transformer Topology in Photovoltaic Grid-Tied Applications

Cited by 6 publications

References 29 publications

Compensation of Unbalanced Low-Voltage Grids Using a Photovoltaic Generation System with a Dual Four-Leg, Two-Level Inverter

Compensation of Unbalanced Low-Voltage Grids Using a Photovoltaic Generation System with a Dual Four-Leg, Two-Level Inverter

A Vector Voltage Modulator for a Dual Inverter with a Floating Bridge to Operate in Normal and Fault Tolerant Mode

Increasing the energy efficiency of modes of distribution networks with photovoltaic stations

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