Single phase transformerless inverter topologies for grid-tied photovoltaic system: A review

Islam, Monirul; Mekhilef, Saad; Hasan, Mahamudul

doi:10.1016/j.rser.2015.01.009

Cited by 219 publications

(89 citation statements)

References 71 publications

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“…The leakage current is completely eliminated through some topologies by fixing the CMV to half of the DC-link using clamping method. Figure 2 presents a categorization of transformerless inverter topologies [10,[25][26][27][28][30][31][32][33][34][35][36][37][38][39][40][41][42].…”

Section: Classification Of Transformerless Inverter Topologiesmentioning

confidence: 99%

“…Half Bridge Based Full Bridge Based Active NPC Topology [31] Conergy NPC Topology [34] Flying Capacitor Topology [33] Diode Clamped Topology [32] OH5 topology [35] Passive Clamped H6 Topology [36] HBZVR Topology [37] HBZVR-D Topology [38] HERIC Clamped Topology [39] DC Side Decoupling AC Side Decoupling H5 Topology [40] H6 Topology [26,41] Improved H6 Topology [27,42] HERIC Topology [25] H6-I Topology [26] H6-II Topology [27] H6-III Topology [28] H6-IV Topology [10] Figure 2. Transformerless inverter topologies: A classification overview.…”

Section: Classification Of Transformerless Inverter Topologiesmentioning

confidence: 99%

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A Review on Recent Advances and Future Trends of Transformerless Inverter Structures for Single-Phase Grid-Connected Photovoltaic Systems

et al. 2018

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Abstract:The research significance of various scientific aspects of photovoltaic (PV) systems has increased over the past decade. Grid-tied inverters the vital elements for the effective interface of Renewable Energy Resources (RER) and utility in the distributed generation system. Currently, Single-Phase Transformerless Grid-Connected Photovoltaic (SPTG-CPV) inverters (1-10 kW) are undergoing further developments, with new designs, and interest of the solar market. In comparison to the transformer (TR) Galvanic Isolation (GI)-based inverters, its advantageous features are lower cost, lighter weight, smaller volume, higher efficiency, and less complexity. In this paper, a review of SPTG-CPV inverters has been carried out. The basic operational principles of all SPTG-CPV inverters are presented in details for positive, negative, and zero cycles. A comprehensive analysis of each topology has been deliberated. A comparative assessment is also performed based on weaknesses, strengths, component ratings, efficiency, total harmonic distortion (THD), semiconductor device losses, and leakage current of various SPTG-CPV inverters schemes. Typical PV inverter structures and control schemes for grid connected three-phase system and single-phase systems are also discussed, described, and reviewed. Comparison of various industrial grids-connected PV inverters is also performed. Loss analysis is also performed for various topologies at 1 kW. Selection of appropriate topologies for their particular application is thoroughly presented. Then, discussion and forthcoming progress are emphasized. Lastly, the conclusions are presented. More than 100 research publications on the topic of SPTG-CPV inverter topologies, configurations, and control schematics along with the recent developments are thoroughly reviewed and classified for quick reference.

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Section: Classification Of Transformerless Inverter Topologiesmentioning

confidence: 99%

Section: Classification Of Transformerless Inverter Topologiesmentioning

confidence: 99%

A Review on Recent Advances and Future Trends of Transformerless Inverter Structures for Single-Phase Grid-Connected Photovoltaic Systems

et al. 2018

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“…These standard deal with matters like total harmonic distortion (THD) and individual harmonic current levels, injected DC current level and leakage current, the range of voltage and frequency for regular operation, power factor (PF) …etc. [7]. The main requirements for the inverter to be connected to the grid are [7]- [9]: www.ijacsa.thesai.org  The inverter output frequency must match the grid frequency.…”

Section: Introductionmentioning

confidence: 99%

Design and Simulation of Adaptive Controller for Single Phase Grid Connected Photovoltaic Inverter under Distorted Grid Conditions

Alswidi¹,

Al-Dobhani²,

Assad³

2017

ijacsa

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Abstract-This paper presents an adaptive controller for single-phase grid-connected photovoltaic inverter under abnormal grid conditions. The main problem associated with the controllers of the grid-connected inverter is that they are tuned for some assumed values of the electrical grid parameters. However, when the parameters, such as voltage and frequency are changed or the grid is subjected to uncertain distortion, these controllers unable to track those variations of the grid parameters and handle the output power within the allowable limit. To overcome such problem, a suitable control strategy is proposed, which is based on frequency adaptive current control and an accurate grid detection. For validity confirmation, a controlled 3KW system, with specific features was designed and simulated. The simulation results confirmed that the strategy is an effective way of control.

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“…The transformer-less, grid-connected, full-bridge inverters have advantages over the transformer-based inverters in their efficiency, size, weight, and cost [1]- [4]. Compared with bipolar sinusoidal pulse-width modulation (SPWM), unipolar SPWM has received more attention due to its smaller current ripple in the filter inductor and higher operation efficiency [5].…”

Section: Introductionmentioning

confidence: 99%

Optimized Hybrid Modulation Strategy for AC Bypass Transformerless Single-Phase Photovoltaic Inverters

Deng¹,

Sun²,

Yang³

et al. 2016

Journal of Power Electronics

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The full-bridge inverter, widely used for single-phase photovoltaic grid-connected applications, presents a leakage current issue. Therefore, an AC bypass branch is introduced to overcome this challenge. Nevertheless, existing modulation strategies entail drawbacks that should be addressed. One is the zero-crossing distortion (ZCD) of the AC current caused by neglecting the AC filter inductor voltage. Another is that the system cannot deliver reactive power because the AC bypass branch switches at the power frequency. To address these problems, this work proposes an optimized hybrid modulation strategy. To reduce ZCD, the phase angle of the inverter output voltage reference is shifted, thereby compensating for the neglected leading angle. To generate the reactive power, the interval of the negative power output is calculated using the power factor. In addition, the freewheeling switch is kept on when power is flowing into the grid and commutates at a high frequency when power is fed back to the DC side. In this manner, the dead-time insertion in the high-frequency switching area is minimized. Finally, the performances of the proposed modulation strategy and traditional strategies are compared on a universal prototype inverter. Experimental results validate the theoretical analysis.

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Single phase transformerless inverter topologies for grid-tied photovoltaic system: A review

Cited by 219 publications

References 71 publications

A Review on Recent Advances and Future Trends of Transformerless Inverter Structures for Single-Phase Grid-Connected Photovoltaic Systems

A Review on Recent Advances and Future Trends of Transformerless Inverter Structures for Single-Phase Grid-Connected Photovoltaic Systems

Design and Simulation of Adaptive Controller for Single Phase Grid Connected Photovoltaic Inverter under Distorted Grid Conditions

Optimized Hybrid Modulation Strategy for AC Bypass Transformerless Single-Phase Photovoltaic Inverters

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