A Modified Phase Disposition Pulse Width Modulation to Suppress the Leakage Current for the Transformerless Cascaded H-Bridge Inverters

Wang, Fusheng; Zhen, Li; Thành, Hiếu Nguyễn; De-hui, Zhang

doi:10.1109/tie.2017.2733488

Cited by 37 publications

(15 citation statements)

References 27 publications

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“…Huang and Huang [36] presented a PWM technique based on feedforward proportional carrier to control a single phase cascaded H-bridge MLI, which was also tested in hardware. Wang et al [37], presented a modified version of phase disposition PWM technique for driving a symmetric MLI, which achieved a THD of 4.88%. Biswas and Khan [38] presented a phase shifted carrier PWM for switching a grid-connected MLI.…”

Section: Acmentioning

confidence: 99%

Design and Hardware Implementation Considerations of Modified Multilevel Cascaded H-Bridge Inverter for Photovoltaic System

et al. 2019

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Inverters are an essential part in many applications including photovoltaic generation. With the increasing penetration of renewable energy sources, the drive for efficient inverters is gaining more and more momentum. In this paper, output power quality, power loss, implementation complexity, cost, and relative advantages of the popular cascaded multilevel H-bridge inverter and a modified version of it are explored. An optimal number of levels and the optimal switching frequency for such inverters are investigated, and a five-level architecture is chosen considering the trade-offs. This inverter is driven by level shifted in-phase disposition pulse width modulation technique to reduce harmonics, which is chosen through deliberate testing of other advanced disposition pulse width modulation techniques. To reduce the harmonics further, the application of filters is investigated, and an LC filter is applied which provided appreciable results. This system is tested in MATLAB/Simulink and then implemented in hardware after design and testing in Proteus ISIS. The general cascaded multilevel H-bridge inverter design is also implemented in hardware to demonstrate a novel low-cost MOSFET driver build for this study. The hardware setups use MOSFETs as switching devices and low-cost ATmega microcontrollers for generating the switching pulses via level shifted in-phase disposition pulse width modulation. This implementation substantiated the effectiveness of the proposed design.

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Section: Acmentioning

confidence: 99%

Design and Hardware Implementation Considerations of Modified Multilevel Cascaded H-Bridge Inverter for Photovoltaic System

et al. 2019

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“…The German standard VDE-0126-1-1 obligates to disconnect PV systems from the grid within 0.3s when the rms value of the leakage current or its peak value increases beyond 30mA and 300mA respectively [10]. Methods for suppressing leakage current are categorized by: 1) decoupling or clamping the parasitic capacitance [11]- [20]; 2) inclusion of common-mode chokes or filters to provide attenuation [21]- [24]; 3) applying appropriate modulation strategies to ameliorate the issue [25]- [28]. In addition, decoupling the parasitic PV capacitances from the AC side of the circuit during the freewheeling period may suppress the leakage current such as in HERIC [12] and H5 [19] topologies.…”

Section: Introductionmentioning

confidence: 99%

Suppressing Leakage Current for Cascaded H-Bridge Inverters in Renewable Energy and Storage Systems

Gunsal

Stone

Foster

2021

IEEE Trans. Ind. Electron.

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“…However, when these Z source inverters are used in the field of PV power generation, the defect of the ground leakage current still exists. For the sake of eliminating the leakage current, an effective method is to make the common-mode voltage constant [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. In [16,17], single-phase H5 and H6 inverters without isolation transformers are proposed, which have lowleakage current characteristics.…”

Section: Introductionmentioning

confidence: 99%

Integrated step‐up non‐isolated inverter with leakage current elimination for grid‐tied photovoltaic system

Liang

Gao

et al. 2019

IET Power Electronics

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This study presents a non-isolated step-up inverter without leakage current for low-voltage renewable energy generation such as photovoltaic (PV) cells grid connection. From the structure of the proposed inverter, the negative terminal of the PV array is directly linked with the grid neutral, so the common mode voltage of the parasitic capacitance can be kept constant and the leakage current will not be generated in theory. Moreover, this transformerless inverter can produce an AC output voltage higher than the input DC voltage, which will reduce the sizes of the generation system. A switching modulation strategy carrier-based is analysed in detail when the input inductor current is operated in discontinuous conduction mode. The operation modes of the proposed inverter are also discussed, respectively, in positive and negative half line cycles. Finally, a digital experimental prototype is tested in the laboratory, and the experimental results are consistent with the theoretical analysis.

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A Modified Phase Disposition Pulse Width Modulation to Suppress the Leakage Current for the Transformerless Cascaded H-Bridge Inverters

Cited by 37 publications

References 27 publications

Design and Hardware Implementation Considerations of Modified Multilevel Cascaded H-Bridge Inverter for Photovoltaic System

Design and Hardware Implementation Considerations of Modified Multilevel Cascaded H-Bridge Inverter for Photovoltaic System

Suppressing Leakage Current for Cascaded H-Bridge Inverters in Renewable Energy and Storage Systems

Integrated step‐up non‐isolated inverter with leakage current elimination for grid‐tied photovoltaic system

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