An Integrated Step-Up Inverter Without Transformer and Leakage Current for Grid-Connected Photovoltaic System

Hu, Xuefeng; Ma, Penghui; Gao, Benbao; Zhang, Meng

doi:10.1109/tpel.2019.2895324

Cited by 117 publications

(61 citation statements)

References 30 publications

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“…As the minimum which is same as presented in [10]. This shows the voltage boosting capability of the converter is unaffected whilst achieving the continuous input current, which is very critical for PV applications.…”

Section: Proposed Pwm Techniquementioning

confidence: 51%

“…Low frequency input current ripple is induced in a single phase inverter due to its power pulsation at double fundamental frequency. The PWM technique presented in [10] further aggravates this issue since the boost inductor is operated in discontinuous current mode with extremely high peak current. To resolve this problem, the input inductor L should be operated (charging and discharging) with a constant duty-cycle.…”

Section: Proposed Pwm Techniquementioning

confidence: 99%

“…Being different from the existing transformerless inverters, an innovative common-ground topology which is capable of single-stage dc-ac power conversion was recently proposed in [10] and its circuit diagram is illustrated in Fig. 2.…”

Section: Introductionmentioning

confidence: 99%

“…While retaining the inherent leakage current suppression ability in a common-ground inverter configuration, the established topology is superior such that it gains added advantages of higher compactness and voltage boosting capability. However, the energy storage inductor is unable to operate in full continuous mode with the modulation technique discussed in [10]. As a result, the input current is discontinuous and its peak value is excessively high.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Lee

Siwakoti

Lim

et al. 2020

IEEE Trans. Circuits Syst. II

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A latest common-ground transformerless inverter for photovoltaic (PV) system has demonstrated its superiority over its existing counterpart due to its merits of single-stage structure and voltage boost capability. The exploited modulation scheme, however, led to discontinuous input current that draws high peak current from the source and causes high input power fluctuation in the converter. Such discontinuous and high peak current are detrimental to the PV source. Addressing this concern, this letter proposes a new modulation technique that achieves continuous input current with reduced peak magnitude while in the meantime ensures a good quality ac output voltage. Simulation and experimental results of a laboratory prototype are provided to verify the effectiveness of the proposed modulation technique.

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Section: Proposed Pwm Techniquementioning

confidence: 51%

Section: Proposed Pwm Techniquementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Lee

Siwakoti

Lim

et al. 2020

IEEE Trans. Circuits Syst. II

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show abstract

“…It is assumed that the threshold inductance is L C . According to (10) and (11), the following equation can be expressed as: (18) The formula between current and voltage is as follows: (19) According to (9), (18) and (19), the following equation can be derived as: (20) The critical inductance L C can be obtained as: (21) As we can see from (21), L C is related to input voltage, load and modulation ratio. In order to ensure the inductor current is always discontinuous throughout the entire range of U in .…”

Section: The Value Of Boost Inductormentioning

confidence: 99%

Analysis and Design of a Transformerless Boost Inverter for Stand-Alone Photovoltaic Generation Systems

Yu¹,

Hu²,

Yao³

et al. 2019

CPSS TPEA

Self Cite

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A novel transformerless boost inverter for standalone photovoltaic generation systems is proposed in this paper. The proposed inverter combines the boost converter with the traditional bridge inverter. The switch S 1 not only realizes the boost function but also participates in inverting process. The inverter has a higher voltage gain and good characteristics when the inductor L 1 is operated in discontinuous mode (DCM) and the nonpolarized capacitor can be chosen as bus capacitor, which makes the volume smaller and the service life of the inverter is increased. The inverter consists of five switches in which only two switches are operated at high frequency state and a monopole sinusoidal pulse width modulation (SPWM) strategy is used. Therefore, the modulation strategy of switches is very simple and the switching loss is reduced. The principle of inverter is described in detail and mathematical models are built by small-signal analysis. Finally, the correctness of the theoretical analysis is verified by simulation and experiment.Index Terms-Boost inverter, discontinuous mode (DCM), monopole sinusoidal pulse width modulation (SPWM), nonpolarized capacitor, photovoltaic generation systems, transformerless.

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Electrostatic‐Assembled MXene@NiAl‐LDHs Electrodes with 3D Interconnected Networks Architectures for High‐Performance Pseudocapacitor Storage

Zhao

2020

Adv Materials Inter

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of pseudocapacitance storage. According to previous studies, LDH is an inorganic anion conductor with a charged brucite-like metal hydroxide layer structure, which is composed of divalent (M 2+) and trivalent (M 3+) metal ioncentered octahedrons. In the accessible interlayer channel, replacing M 2+ with M 3+ can results in the insertion of positively charged and negatively charged counterions (A n−), and some anions and uncharged molecules are in the interlayer, which play a crucial role in ion conduction. [18-22] In particular, the combination of the anion exchange performance and 2D structure improves the electron/ ion transmission efficiency and kinetics during charge-discharge process. Therefore, while maintaining the 2D layered structure, LDHs can also adjust the transition metal charge, which can increase the pseudocapacitance of the electrode material. [23-29] Moreover, NiAl-LDHs have attracted considerable attention because of their higher theoretical specific capacitance, lower cost, easy to be synthesized and promising materials for advanced electrodes. Some studies had shown that Ni/Al ratio has a significant influence on its structure, morphology, ion transport mechanics, interlayer phenomena and performance, and the specific capacitance and charge-discharge cycling performances can be further increased by controlling the ratio of Al/Ni. [2] However, the interface contacts and poor electrical conductivity widely affects electron transport and ion migration. Although the NiAl-LDHs electrode material has high reactivity and high theoretical capacitance, its insulation and large interface contact area lead to high impedance, which affects the pseudocapacitance storage performance. [30] To solve the above issues, one of the strategies used to improve the conductivity of LDHs is the introduction of a conductor with cross-link nanoscale active ingredients (such as graphene or carbon nanotubes). [31-35] The MAX phase is a ternary ceramic material, where M, A, and X represent transition metal elements, elements of the third or fourth main group, and C or N, respectively. MXene is obtained by etching the MAX phase with HF. As a new potential 2D material, with the 2D structure, the electrical conductivity of metal and the hydrophilic surface, MXene shows excellent performance in the fields of Multifarious layered electrode materials are attracting increased attention in the field of energy storage because of their high specific surface and interlayer modifiability. However, the natural tendency to be re-superimposed and the inherent disadvantages of a single layered electrode significantly affect electronic transport and ion migration. Considering the poor electrochemical performance and low structural stability, a novel MXene@PDDA/NiAl-LDHs hybrids as supercapacitor electrode via an electrostatic-assembled approach is elaborately designed. The alternate MXene and PDDA/NiAl-LDHs layers with 3D interconnected networks architectures could ensure intimate contact to efficiently take advantage of high electron cond...

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An Integrated Step-Up Inverter Without Transformer and Leakage Current for Grid-Connected Photovoltaic System

Cited by 117 publications

References 30 publications

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

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

Analysis and Design of a Transformerless Boost Inverter for Stand-Alone Photovoltaic Generation Systems

Electrostatic‐Assembled MXene@NiAl‐LDHs Electrodes with 3D Interconnected Networks Architectures for High‐Performance Pseudocapacitor Storage

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