An Improved PWM Technique to Achieve Continuous Input Current in Common-Ground Transformerless Boost Inverter

Lee, Sze Sing; Siwakoti, Yam P.; Lim, Chee Shen; Lee, Kyo‐Beum

doi:10.1109/tcsii.2020.2967899

Cited by 20 publications

(33 citation statements)

References 12 publications

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“…This can significantly increase the cost and reduce efficiency. [57], (e) converter presented in the work of [58], the work of [59], (f) converter presented in the work of [60], (g) converter presented in the work of [61], (h) converter presented in the work of [62], (i) converter presented in the work of [63].…”

Section: Boosting Vscgmentioning

confidence: 99%

“…The boost CG inverter is presented in [58,59] and shown in Figure 5e. This inverter can offer continuous input current along with high boosting gain.…”

mentioning

confidence: 99%

“…Voltage-source common-grounded (CSCG) converters (boosting type). (a) Converter presented in the work of [54], (b) converter presented in the work of[55], (c) converter presented in the work of[56], (d) converter presented in the work of[57], (e) converter presented in the work of[58], the work of[59], (f) converter presented in the work of[60], (g) converter presented in the work of[61], (h) converter presented in the work of[62], (i) converter presented in the work of[63].…”

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confidence: 99%

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Common-Ground Photovoltaic Inverters for Leakage Current Mitigation: Comparative Review

et al. 2021

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In photovoltaic systems, parasitic capacitance is often formed between PV panels and the ground. Because of the switching nature of PV converters, a high-frequency voltage is usually generated over these parasitic capacitances; this, in turn, can result in a common-mode current known as leakage current. This current can badly reach a high value if a resonance circuit is excited through the PV’s parasitic capacitance and the converter’s inductive components. Transformers are usually used for leakage current mitigation. However, this decreases the efficiency and increases the cost, size, and weight of the PV systems. Number of strategies have been introduced to mitigate the leakage current in transformer-less converters. Among these strategies, using common-ground converters is considered the most effective solution as it offers a solid connection between the negative terminal of PV modules and the neutral of the grid side; thus, complete mitigation of the leakage current is achieved. Number of common-ground inverters have been recently presented. These inverters are different in their size, cost, boosting capability, the possibility of producing DC currents, and their capability to offer multilevel shaping of output voltage. This work introduces a comprehensive review and classification for various common-ground PV inverters. Therefore, a clear picture of the advantages and disadvantages of these inverters is clarified. This provides a useful indication for a trade-off between gaining some of the advantages and losing others in PV systems. In addition, the potentials for optimization based on different performance indicators are identified.

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Section: Boosting Vscgmentioning

confidence: 99%

“…The boost CG inverter is presented in [58,59] and shown in Figure 5e. This inverter can offer continuous input current along with high boosting gain.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

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Common-Ground Photovoltaic Inverters for Leakage Current Mitigation: Comparative Review

et al. 2021

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“…However, removing the transformer is a new challenge, as the leakage current arises in the system. The leakage current is mainly affected by the variation of the voltage in common mode over time [53]. Taking as an example an inverter without transformer with complete bridge topology for a residential PV system connected to the single-phase grid, the equivalent CM circuit of Figure 5 is considered.…”

Section: Common-mode Voltage Analysismentioning

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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“…Hence, the resulting common mode voltages equal to zero and leakage currents are eliminated in accordance [6]. The split source CG topology has been proposed in [7] for achieving high boosting factors, and its enhanced modulation method has been presented in [8]. Several control methods have been presented for CG PV topologies using classical control systems [9].…”

Section: Introductionmentioning

confidence: 99%

Model Predictive Control-Based Three-Port Common Ground Photovoltaic-Battery Grid-Connected Inverter

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Abdeen

Kouro

et al. 2021

IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society

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An Improved PWM Technique to Achieve Continuous Input Current in Common-Ground Transformerless Boost Inverter

Cited by 20 publications

References 12 publications

Common-Ground Photovoltaic Inverters for Leakage Current Mitigation: Comparative Review

Common-Ground Photovoltaic Inverters for Leakage Current Mitigation: Comparative Review

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

Model Predictive Control-Based Three-Port Common Ground Photovoltaic-Battery Grid-Connected Inverter

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