DC Decoupling-Based Three-Phase Three-Level Transformerless PV Inverter Topology for Minimization of Leakage Current

Sonti, Venu; Jain, Sachin

doi:10.1109/tie.2018.2869364

Cited by 16 publications

(8 citation statements)

References 11 publications

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“…Note that the input capacitor is excluded in the number of capacitors. Number of capacitors in the proposed inverter, inverters in References 10,12,14,19,29 is less than that in the inverters in References 16,20–22,28. The inverter in Reference 16 has damping resistors, but there are no damping resistors in the other inverters in Table 2.…”

Section: Resultsmentioning

confidence: 96%

“…Number of inductors in the proposed inverter and the inverter in Reference 19 is four, while it is six in the inverters in References 15,16,20–22, which is the most among the inverters in Table 2. Number of inductors in the inverters in References 8,10,12,14,17,18,28 is three, while it is two in the inverter in Reference 29, which is the least among the inverters in Table 2. There is no capacitor in the inverters in References 8,15,17,18 because of no output capacitors in the grid‐connected inverters.…”

Section: Resultsmentioning

confidence: 99%

“…The PV inverter can operate at off‐grid and grid‐tied modes. The proposed inverter and inverters in References 14,28,29 operate at off‐grid mode, while the other inverters operate at grid‐tied mode.…”

Section: Resultsmentioning

confidence: 99%

“…The H7, H8, H9, H10, and H12 TPT PV inverters were proposed by adding switches into the traditional TPT PV inverters 8–13 . A three‐level TPT PV inverter was presented to limit the CMLC by adding a decoupling circuit 14 . In addition, three switches can be added into the three‐phase cascaded H4 inverter to reduce the CMLC 15 .…”

Section: Introductionmentioning

confidence: 99%

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Three‐phase transformerless photovoltaic inverter without common mode leakage current

Yao

Gan

et al. 2022

Engineering Reports

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Since three-phase transformerless (TPT) PV inverters have large common mode leakage current (CMLC), a TPT PV inverter without CMLC is proposed. The proposed inverter is derived from three single-phase half-bridge inverters and a boost converter. Grounds of the PV array and three-phase loads are connected directly, so no CMLC exists in the TPT solar inverter. Operating principle, stability analysis, and loss calculation and example of the proposed three-phase inverter are illustrated in detail. The pulse-width modulation (PWM) and sinusoidal PWM control methods are used in the boost converter and three-phase inverter, respectively. The proposed inverter is a stable system. Finally, simulation and experimental results of a 900-W TPT PV inverter confirm the theoretical analysis. The CMLC in the proposed inverter is only about 0.8 mA, which is mainly caused by the ground line inductance and oscilloscope probe noise.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Three‐phase transformerless photovoltaic inverter without common mode leakage current

Yao

Gan

et al. 2022

Engineering Reports

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show abstract

“…The stray capacitance is affected by several factors, such as PV panel and chassis structure, the PV cell surface, the distance between cells, weather conditions, and type of common-mode filter [15], [16]. Contributions have been conducted on development of new topologies or solutions to lower the leakage current through modifying the CMV amplitude [20]. Especially, when utilizing SiC power devices with high switching frequency, it becomes critical to suppress leakage current by low or constant CMV amplitudes, which helps to mitigate the system high-frequency emission source [22].…”

Section: Introductionmentioning

confidence: 99%

Common Mode Voltage Reduction of Single-Phase Quasi-Z-Source Inverter-Based Photovoltaic System

Liu

Xiao

et al. 2019

IEEE Access

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A common mode voltage (CMV) reduction method is proposed for the active power filter (APF) integrated single-phase quasi-Z-source inverter (qZSI) based photovoltaic (PV) power system. The APF integrated qZSI completely compensates the dc-side double-line-frequency (2ω) ripple through the APF capacitor, while maintaining low qZS inductance and capacitance. The proposed method reduces the CMV amplitude to half of that using the traditional sinusoidal pulse width modulation (SPWM). The switching and conduction power losses are analyzed. Simulation and experimental results demonstrate the proposed method reduces CMV without comprising performance and efficiency of the APF integrated single-phase qZSI. INDEX TERMS Common mode voltage, single-phase inverter, quasi-Z-source inverter, pulsewidth modulation.

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Three‐phase common‐ground‐type photovoltaic inverter without shoot‐through problem

Yao,

2024

Circuit Theory & Apps

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SummarySince there are common mode leakage current (CMLC) and shoot‐through problems in the conventional three‐phase transformerless photovoltaic (PV) inverters, the three‐phase common‐ground‐type transformerless dual‐buck inverters (DBIs) are derived. By shorting the neutral point of the three‐phase load and the negative terminal of the PV panel, the CMLC is eliminated. The DBIs has no shoot‐through problem and there is no current flowing through the body diode of the SiC metal oxide semiconductor field‐effect transistor (MOSFET). The three‐phase DBI combined with a buck‐boost converter is taken as an example to illustrate the operating principle of the derived inverters. The control strategy of the inverter is given. A prototype is built to validate the proposed inverter. Finally, comparison among the proposed inverter and other three‐phase inverters is given.

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DC Decoupling-Based Three-Phase Three-Level Transformerless PV Inverter Topology for Minimization of Leakage Current

Cited by 16 publications

References 11 publications

Three‐phase transformerless photovoltaic inverter without common mode leakage current

Three‐phase transformerless photovoltaic inverter without common mode leakage current

Common Mode Voltage Reduction of Single-Phase Quasi-Z-Source Inverter-Based Photovoltaic System

Three‐phase common‐ground‐type photovoltaic inverter without shoot‐through problem

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