A novel single-phase five-level transformer-less photovoltaic (PV) inverter

Zhu, Xiaonan; Wang, Hongliang; Zhang, Wenyuan; Wang, Hanzhe; Deng, Xiaojun; Yue, Xiumei

doi:10.30941/cestems.2020.00040

Cited by 23 publications

(10 citation statements)

References 34 publications

(37 reference statements)

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“…Both the German standard VDE 0126-1-1 and Section 690. 35 of the 2014 National Electrical Code (NEC) USA standards contain specifics about these requirements [16]- [17]. The family of transformer-less topologies depicted in Fig.…”

Section: Introductionmentioning

confidence: 99%

Coupled Inductor Based Boost Microinverter With Dual Mode Time Sharing Operation for Renewable Energy Applications

Alhuwaishel,

Ahmed

2024

IEEE Access

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Section: Introductionmentioning

confidence: 99%

Coupled Inductor Based Boost Microinverter With Dual Mode Time Sharing Operation for Renewable Energy Applications

Alhuwaishel,

Ahmed

2024

IEEE Access

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“…Callegaro et al (2022) proposed a feedback linearization-based controller that eliminates the instability of photovoltaic voltage. In order to reduce the leakage current of a PV inverter, a five-level transformer-less inverter and a three-phase Z-source three-level four-leg inverter were developed (Zhu et al, 2020;Guo et al, 2018), respectively.…”

Section: Introductionmentioning

confidence: 99%

Small-signal oscillatory stability of a grid-connected PV power generation farm affected by the increasing number of inverters in daisy-chain connection

Zhou¹,

Cao²,

Zhao³

2023

Front. Energy Res.

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The daisy-chain connection of inverters is one of the basic configurations of the power collecting network in a grid-connected photovoltaic (PV) power generation farm. In this study, the total impact of a cluster of M similar inverters in daisy-chain connection in the PV farm is examined in the following two aspects: 1) aggregated representation of the cluster of inverters is derived for stability study based on the dynamic equivalence. The derivation confirms the rationality of representing the cluster of inverters by an aggregated inverter connected to the external system via an equivalent reactance, which is the maximum eigenvalue of the matrix of daisy-chain connection defined in the article. 2) Analysis is conducted to indicate that the risk of oscillatory instability may be collectively induced by all the inverters in the daisy-chain connection in the cluster. This explains why the increasing number of inverters may imply the possible instability risk of a PV farm. An example of a power system with a grid-connected PV power generation farm is presented in the article to demonstrate and evaluate the analytical conclusion obtained.

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“…Hence, the modulation effect is reflected in the ripple content of the inverter output current and can thereby affect the grid-interfaced filter losses. Thanks to this concept, the five-level (5L)-inverters proposed in [26], [27] have used 12 power switches to attain all the possible output voltage levels with a constant HF-CMV. A combination of T-type and half-bridge leg introduces another 5L inverter in [28] in which its HF-CMV is not constant but varied within half and one-quarter of the main dc-link voltage.…”

Section: Introductionmentioning

confidence: 99%

HERIC-Clamped and PN-NPC Inverters With Five-Level Output Voltage and Reduced Grid-Interfaced Filter Size

Syasegov

Farhangi

Barzegarkhoo

et al. 2023

IEEE Open J. Power Electron.

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Transformerless grid-connected inverters with highly efficient and reliable inverter concept (HERIC) and positive-negative neutral point-clamped (PN-NPC) circuit configurations exhibit excellent performance in terms of overall efficiency, common-mode voltage, and alleviated leakage current concern. These inverters are designed to generate only a three-level (3L) output voltage waveform, thereby reducing the power density of a conversion system. On the other hand, it is well-known that increasing the inverter output voltage levels entails the reduction of the output filter size. In this regard, this article aims to develop a five-level (5L) inverter output voltage for the improved versions of HERIC-clamped and original PN-NPC inverters. This is achieved with either phase-shifted or level-shifted pulse width modulation technique leading to further quality improvement of ac voltage and current waveforms through increasing the number of output voltage levels. Therefore, a much smaller output filter size can be utilized, while the overall efficiency of the entire system is enhanced. Two laboratory-built SiC-based prototypes for both the proposed HERIC-clamped (1.8 kW) and PN-NPC-5L (2 kW) inverters have been fabricated to show the feasibility and effectiveness of the proposed solution via experiments.

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A novel single-phase five-level transformer-less photovoltaic (PV) inverter

Cited by 23 publications

References 34 publications

Coupled Inductor Based Boost Microinverter With Dual Mode Time Sharing Operation for Renewable Energy Applications

Coupled Inductor Based Boost Microinverter With Dual Mode Time Sharing Operation for Renewable Energy Applications

Small-signal oscillatory stability of a grid-connected PV power generation farm affected by the increasing number of inverters in daisy-chain connection

HERIC-Clamped and PN-NPC Inverters With Five-Level Output Voltage and Reduced Grid-Interfaced Filter Size

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