Common Mode Current Reduction of Three-phase Cascaded Multilevel Transformerless Inverter for PV System

Wang, Wenjie; Chen, Ke; Hang, Lijun; Tong, Anping; Gan, Yiliang

doi:10.23919/ipec.2018.8507776

Cited by 5 publications

(5 citation statements)

References 7 publications

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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%

“…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][21][22]28. The inverter in Reference 16 has damping resistors, but there are no damping resistors in the other inverters in Table 2. Since switching frequency in the proposed inverter is the highest among all the inverters in Table 2, efficiency of the proposed inverter is lower than that in the inverters in References 16,17,20,22.…”

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

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: Resultsmentioning

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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“…The H5 and H6 inverters are two well-known topologies that suppress the leakage currents in grid-tied PV applications [19], [20]. Accordingly, in order to eliminate the inter-module leakage currents in the CMI, the H-bridge cells were replaced with H5 and H6 cells in [21] and [22], respectively. Additionally, dc-side and ac-side filters were designed to limit the leakage currents in [18].…”

Section:  mentioning

confidence: 99%

A Multilevel Inverter With Minimized Components Featuring Self-Balancing and Boosting Capabilities for PV Applications

Jahan

Abapour

Zare

et al. 2023

IEEE J. Emerg. Sel. Topics Power Electron.

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Cascaded H-bridge Multilevel Inverter (CMI) attracts much attention as a versatile converter in photovoltaic (PV) applications. Requiring several isolated dc sources and many switches are the main demerits of the CMI. In PV applications with the CMI, PV modules can be used as the isolated dc sources, which, however, may contribute to intermodule and grid leakage currents due to the module stray capacitors. In this context, a switched-capacitor-based cascaded half-bridge multilevel inverter is proposed in this paper to address the above issues. The proposed topology only requires one dc source, and it achieves the minimum number of switches, spontaneous capacitor charging, voltage boosting, and continuous input current. The inter-module leakage currents can also be eliminated in the proposed topology. The feasibility and effectiveness of the proposed topology are validated through simulations and experimental tests.

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An improved modulation method for low common-mode current non-isolated series simultaneous power supply dual-input inverters for new energy generation applications

Sun,

Jiang

2024

Electr Eng

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Multi-input power supply systems are mostly used in the field of combined power supply of multiple new energy sources, and multi-input inverters play an important role in multi-input power supply systems, but multi-input inverters have the problem of common mode currents. This paper proposes an improved modulation method for a non-isolated series simultaneous power supply type dual-input inverter with low common-mode current for new energy generation applications. The design of a simulation circuit based on the corresponding dual-input inverter shows that this type of inverter can suppress the commonmode current below 30mA and has the advantage of low switching stress, providing an effective single-stage inverter solution for the combined power supply of multiple new energy sources.

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Common Mode Current Reduction of Three-phase Cascaded Multilevel Transformerless Inverter for PV System

Cited by 5 publications

References 7 publications

Three‐phase transformerless photovoltaic inverter without common mode leakage current

Three‐phase transformerless photovoltaic inverter without common mode leakage current

A Multilevel Inverter With Minimized Components Featuring Self-Balancing and Boosting Capabilities for PV Applications

An improved modulation method for low common-mode current non-isolated series simultaneous power supply dual-input inverters for new energy generation applications

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