Modified Single-Phase Single-Stage Grid-Tied Flying Inductor Inverter With MPPT and Suppressed Leakage Current

Azary, Mehdi Tofigh; Sabahi, Mehran; Babaei, Ebrahim; Meinagh, Farhad Abbasi Aghdam

doi:10.1109/tie.2017.2719610

Cited by 89 publications

(49 citation statements)

References 18 publications

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“…The efficiency and the losses were studied for all these iterative results. The achievable efficiency, 98.73% found as a result of ZVS operated H-bridge inverter, is well above the inverter topologies used and reported in some papers [23,24,26,27]. This is possible only due to the fact that, the reactive current is controlled and made sufficient for the loss-less switching of all the switches used in this topology.…”

Section: Resultssupporting

confidence: 60%

Analysis and Design of Solar Power System Interface Utility Using ZVS Converter

Deshbhratar¹

2018

Tr Ren Energy

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The solar power generation system with minimal losses, high simplicity and easy control is attempted in this work, by developing a grid-tied zerovoltage switching (ZVS) inverter with a less number of power conversion stages and the least count of passive components, for single-phase applications that are suitable for conversion from low-voltage DC (40-60 V) to line voltage AC (230 VAC; RMS) at average power levels of 175 W and below. The ZVS full-bridge inverter fed from a PV panel is working on higher frequency with an asymmetric auxiliary circuit, which guarantees ZVS at the switching instants of the metal-oxidesemiconductor field-effect transistors (MOSFETs) by supplying the reactive current to these full-bridge semiconductor switches and reducing the switching losses. Checking of the constructional workability and analytical feasibility of the proposed topology with the highest efficiency and the simplest control was the target of this work, which was set on the basis of the results obtained in the MATLAB Simulink environment. The control strategies were planned for the optimum value of the reactive current injected by the auxiliary circuit to guarantee ZVS and use of phase shifted pulsewidth modulation (PWM) with varying frequencies for the full-bridge inverter and half-bridge cyclo-converter. The hybrid maximum power point tracking (MPPT) was part of this plan used to set the power at its maximum value against the environmental changes.

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Section: Resultssupporting

confidence: 60%

Analysis and Design of Solar Power System Interface Utility Using ZVS Converter

Deshbhratar¹

2018

Tr Ren Energy

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“…In Reference [57] a comparative table is presented, which also highlights the maximum average current of the switches and the overall efficiency of the system. The research [108] also shows a comparative study with structures similar to transformerless single-phase single-stage grid-tied flying inductor inverters.…”

Section: Comparative Studymentioning

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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“…The single-stage topologies are commonly comprised of an inverting section which interfaces solar arrays and generates ac output while the two-stage topologies are improved with a dc/dc converter at the first stage and inverter section in the second stage. Figure 2 represents the most widely known topologies of novel solar inverters as single or two-stage configurations [9,11,15,[17][18][19][20][21]. Figure 2a shows a transformerless solar inverter in single-stage configuration with a dc link capacitor (C link ) acting as the input source of the MPPT controller [19].…”

Section: Single-phase Transformerless Pv Invertersmentioning

confidence: 99%

Design and Implementation of a Dual-Input Single-Output Photovoltaic Converter

Kabalcı

Guerrero

2020

Energies

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In many solar inverters, a dc/dc converter is mainly located between the solar arrays and the inverter. This study presents an enhanced maximum power point tracking (MPPT) algorithm for photovoltaic (PV) systems that drives solar array voltages to track a reference value and decreases fluctuations and oscillations in PV voltage. Different from the previously presented methods, a novel MPPT method is proposed that ensures tracking accuracy by considering output voltage in addition to input voltage and currents. The proposed method detects d I / d V variations, compares the output voltage with the desired reference to shift operation mode and refreshes step size. The digital filtering, enhanced PI, and perturb-and-observe (P&O) tracking features of the proposed MPPT method make it robust to mitigate source fluctuations and sensitivity to partial shading based oscillations. In order to validate the success of the proposed method, a test rig has been installed with dual boost converters. The performance improvements have been verified by both simulation and experimental results that are compared to InCon and P&O MPPT methods. It is also confirmed by experimental results that the proposed MPPT method provides robust control capability in terms of tracking the reference voltage and rejecting the effects of various shading situations on solar arrays.

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Modified Single-Phase Single-Stage Grid-Tied Flying Inductor Inverter With MPPT and Suppressed Leakage Current

Cited by 89 publications

References 18 publications

Analysis and Design of Solar Power System Interface Utility Using ZVS Converter

Analysis and Design of Solar Power System Interface Utility Using ZVS Converter

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

Design and Implementation of a Dual-Input Single-Output Photovoltaic Converter

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