A Family of Neutral Point Clamped Full-Bridge Topologies for Transformerless Photovoltaic Grid-Tied Inverters

Zhang, Li; Sun, Kai; Feng, Li; Wu, Hongfei; Xing, Yan

doi:10.1109/tpel.2012.2205406

Cited by 324 publications

(127 citation statements)

References 25 publications

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“…Often these renewable energy sources have low-voltage output and must pass through a set of high boost converter circuits to increase the voltage, and then through a DC-AC inverter to convert AC voltage from the main supply in parallel. Therefore, a DC-DC high boost ratio circuit affects the overall efficiency of the system [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

A Novel High Step-Up DC-DC Converter with Coupled Inductor and Switched Clamp Capacitor Techniques for Photovoltaic Systems

et al. 2017

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Abstract:In this study, a novel high step-up DC-DC converter was successfully integrated using coupled inductor and switched capacitor techniques. High step-up DC-DC gain was achieved using a coupled inductor when capacitors charged and discharged energy, respectively. In addition, energy was recovered from the leakage inductance of the coupled inductor by using a passive clamp circuit. Therefore, the voltage stress of the main power switch was almost reduced to 1/7 V o (output voltage). Moreover, the coupled inductor alleviated the reverse-recovery problem of the diode. The proposed circuit efficiency can be further improved and high voltage gain can be achieved. The operation principle and steady-state analysis of the proposed converter were discussed. Finally, a hardware prototype circuit with input voltage of 24 V, output voltage of up to 400 V, and maximum power of 150 W was constructed in a laboratory; the maximum efficiency was almost 96.2%.

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Section: Introductionmentioning

confidence: 99%

A Novel High Step-Up DC-DC Converter with Coupled Inductor and Switched Clamp Capacitor Techniques for Photovoltaic Systems

et al. 2017

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“…The behavior of H5, HERIC and H6 topologies is analyzed and compared in terms of power losses in [16], where the proposed H6 topology shows a lower efficiency than HERIC but higher than H5 (the measured European Efficiencies in 1 kW prototypes for H5, HERIC and H6 are 96.78 %, 97 % and 97.09 %, respectively) and the minimum leakage current corresponds to H5 (6 mA). Neutral Point Clamped converters are analyzed in [17], where it is shown that the European Efficiency reaches 96.4 %, 96.9 %, and 97.2 % for FB-DCBP, oH5 and PN-NPC topologies, respectively. NPC 1φ PV inverters are also analyzed in [18], where a generalized design principle for NPC circuits is discussed.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Robustness of Transformerless PV Inverter Topologies to the Choice of Power Devices

Jedtberg

Pigazo

Liserre

et al. 2017

IEEE Trans. Power Electron.

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“…Thus, improvement of the bridge structure for a full-bridge inverter is necessary; and a few new topologies have been proposed. The new techniques used in [3]- [11] can be summarized as follows. By adding active devices or a circuit as auxiliary switches to modify the structure in a full-bridge inverter where the main switches still operate under bipolar modulating condition, the solar panel in an inverter system can be separated from the grid.…”

Section: Introductionmentioning

confidence: 99%

“…Other topologies have similar issues. Large capacitors in a capacitive voltage divider at the input were employed in the half-bridge topologies in [5], [8], [11], and [13]; however, the control method for voltage balancing was not stated therein. Therefore, further study on non-isolated photovoltaic grid-connected inverters without leakage current is required.…”

Section: Introductionmentioning

confidence: 99%

A Dual Buck Three-Level PV Grid-Connected Inverter

Ji¹,

Hong²,

Wang³

et al. 2015

Journal of Power Electronics

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The use of a PV grid-connected inverter with non-isolated topology and without a transformer is good for improving conversion efficiency; however, this inverter has become increasingly complicated for eliminating leakage current. To simplify the complicated architecture of traditional three-level dual buck inverters, a new dual Buck three-level PV grid-connected inverter topology is proposed. In the proposed topology, the voltage on the grounding stray capacitor is clamped by large input capacitors and is equal to half of the bus voltage; thus, leakage current can be eliminated. Unlike in the traditional topology, the current in the proposed topology passes through few elements and does not flow through the body diodes of MOSFET switches, resulting in increased efficiency. Additionally, a multi-loop control method that includes voltage-balancing control is proposed and analyzed. Both simulation and experimental results are demonstrated to verify the proposed structure and control method.

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A Family of Neutral Point Clamped Full-Bridge Topologies for Transformerless Photovoltaic Grid-Tied Inverters

Cited by 324 publications

References 25 publications

A Novel High Step-Up DC-DC Converter with Coupled Inductor and Switched Clamp Capacitor Techniques for Photovoltaic Systems

A Novel High Step-Up DC-DC Converter with Coupled Inductor and Switched Clamp Capacitor Techniques for Photovoltaic Systems

Analysis of the Robustness of Transformerless PV Inverter Topologies to the Choice of Power Devices

A Dual Buck Three-Level PV Grid-Connected Inverter

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