A high efficiency transformerless PV grid-connected inverter with leakage current suppression

Khan, Shakil Ahamed; Guo, Youguang; Zhu, Jun

doi:10.1109/icece.2016.7853888

Cited by 13 publications

(6 citation statements)

References 12 publications

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“…Many studies have focused on photovoltaic (PV) energy as one of the most important renewable energy sources. PV has many advantages such as low operating and maintenance cost, no noise, pollution free and it is inexhaustible [2]. PV can be used in two systems to supply with electrical power; off-grid system and on-grid system.…”

Section: Introductionmentioning

confidence: 99%

A proposed five level inverter for transformerless photovoltaic grid-connected applications

El-Menofy

Osheba

El-Kholy

et al. 2022

Preprint

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The transformerless inverter for grid-connected photovoltaic (PV) system has been an increasing interest from researchers because of the benefits of smaller size, lower cost and higher efficiency compared with the ones which have transformer. However, the leakage current which resulting in transformerless inverter because of the absence of galvanic isolation must be eliminated. In this study, a novel single-phase transformerless multilevel inverter for grid-tied PV systems is proposed. The proposed inverter can reduce the leakage current. A suitable sinusoidal pulse width modulation (PWM) is modified to utilize with the proposed inverter to produce five-level output voltage. The structure of the new circuit and its principle of operation with the modified modulation strategy are illustrated in this paper. A simulation of the proposed inverter included in grid-tied PV system with a convenient control system have been built in MATLAB/Simulink software to verify the theoretical explanations. Finally, a prototype is tested to verify the theoretical analysis and main contributions of the study.

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Section: Introductionmentioning

confidence: 99%

A proposed five level inverter for transformerless photovoltaic grid-connected applications

El-Menofy

Osheba

El-Kholy

et al. 2022

Preprint

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“…Photovoltaic inverters are the main device to utilise photovoltaic energy [6][7][8]. The isolated inverters are equipped with low or high frequency transformer for electrical isolation, which leads to the disadvantages of bulk and inefficiency [9][10][11][12][13]. Non-isolated inverters do not have these problems [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of leakage current suppression capability of forward‐clamped and reverse‐clamped H10 three‐phase inverters

Shao

Lan

2021

IET Power Electronics

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Non‐isolated inverters have the disadvantage of large leakage current, which will damage the equipment and personal safety. In order to solve this problem, this paper proposes two H10 three‐phase inverter topologies named forward‐clamped and reverse‐clamped H10 inverters. Each of the topologies is composed of two DC bus switches, a clamping circuit and a traditional three‐phase inverter, but the clamping method of these two topologies is different. A general control strategy combining carrier modulation and logic operation for these two topologies are proposed. The control strategy allows the common‐mode voltage of these two topologies to vary between one third and two thirds of the DC bus voltage, but the frequency of the common‐mode voltage of the reverse‐clamped inverter is three times that of the forward‐clamped inverter. The loop impedance of the reverse‐clamped inverter increases significantly at high frequency, so the leakage current suppression capability is better. Simulation and experiment platforms of the inverter systems are built. The obtained results verify the correctness of the theoretical analysis.

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“…Although the high-frequency transformer reduces the size of PV system, it is installed on the dc side, which increases the complexity of main circuits, reduces the system stability, and affects the system efficiency. To overcome these shortcomings and improve the efficiency of PV system, the transformerless inverters are widely used in the residential PV system with small capacities [1]. Although the volumes have been greatly reduced in the transformerless inverter, the efficiency has been improved, and the costs has been decreased.…”

Section: Introductionmentioning

confidence: 99%

Novel Common-Mode Current Suppression Method in Transformerless PV Grid-Connected System

2018

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The existence of high-frequency components in common-mode (CM) current would reduce the stability of a non-isolated PV grid-connected system. It has great impacts on the output power quality when the generated power from PV is low. The method of single CM inner loop in suppressing the high-frequency components has poor effect. Based on the CM equivalent circuit model and the cause analysis of the CM current, a novel dual CM inner loops method is proposed to restrain the high-frequency components in CM current. This method not only meets the grid connection demand of CM current, but also overcomes the high frequency resonant problem. Furthermore, the high-frequency components in CM current from the outer parasitic circuit are substantially reduced. Finally, the proposed method is verified by simulation and experimental results.

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A high efficiency transformerless PV grid-connected inverter with leakage current suppression

Cited by 13 publications

References 12 publications

A proposed five level inverter for transformerless photovoltaic grid-connected applications

A proposed five level inverter for transformerless photovoltaic grid-connected applications

Comparative analysis of leakage current suppression capability of forward‐clamped and reverse‐clamped H10 three‐phase inverters

Novel Common-Mode Current Suppression Method in Transformerless PV Grid-Connected System

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