Mitigation of Ground Leakage Current of Single-Phase PV Inverter Using Hybrid PWM With Soft Voltage Transition and Nonlinear Output Inductor

Shen, Ruihua; Chung, Henry Shu-Hung

doi:10.1109/tpel.2020.3016867

Cited by 22 publications

(3 citation statements)

References 21 publications

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“…Notably, a hybrid method with multiple modulation schemes in distinct quadrants of operation is presented by Tang et al [29]. A hybrid scheme is formulated with the inclusion of soft voltage transition modulation (SVTM) at zero crossings along conventional unipolar PWM by Shen et al [30]. A hybrid technique consolidating the advantages of carrier phase shift and carrier phase disposition PWM is proposed by Ye et al [4].…”

Section: Proposed Hybrid Control Schemementioning

confidence: 99%

A Hybrid Nearest Level Combined With PWM Control Strategy: Analysis and Implementation on Cascaded H-Bridge Multilevel Inverter and its Fault Tolerant Topology

Sarwar

Farooqui

et al. 2021

IEEE Access

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This paper presents a hybrid control strategy which combines the nearest level control technique with PWM control technique on a cascaded H-Bridge Multilevel Inverters (MLI). MLIs have become very popular due to its several adavantages in the application areas like industrial drives and gridconnected renewable energy generation systems. With the reduced number of switches, driver circuits, conduction losses, switching losses, voltage stresses, size, and cost of the system, MLI has outperformed its two-level counterpart in terms of power quality issues. Reduction in the Harmonics and consequently the Total Harmonic Distortion (THD) in the output voltage has added to the benefits of MLI. Topological advancements in MLI require a satisfactory output voltage control strategy. In this work, a hybrid control strategy for a smooth and wider range of control of output voltage is proposed. The hybridized scheme enhances the control range of the voltage considerably. Moreover, the THD is also reduced compared to the conventional sinusoidal PWM scheme. A thorough analysis of the scheme has also been presented in the paper. SIMULINK/ MATLAB environment is used for testing the simulation model of the proposed control scheme. This hybridized controlling technique is also simulated for thermal modelling on PLECS software and power loss analysis is performed. The mathematical and simulation analyses are validated on an experimental prototype using a TMS320F28335 DSP controller card. The hybrid scheme has also been tested for a fault tolerant model of the cascaded H-bridge inverter. The performance of the hybrid scheme under different fault condition has also been shown to work satisfactorily.

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Section: Proposed Hybrid Control Schemementioning

confidence: 99%

A Hybrid Nearest Level Combined With PWM Control Strategy: Analysis and Implementation on Cascaded H-Bridge Multilevel Inverter and its Fault Tolerant Topology

Sarwar

Farooqui

et al. 2021

IEEE Access

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“…The isolated inverters have no common mode leakage current, but the power density and the efficiency of them are low and cost of them is high. The power density and the efficiency of the transformer-less inverters are high and the cost of them is low, while there is common mode leakage current in them, which may induce problems of personal safety, severe electromagnetic interference, and extra loss [3]. Therefore, the PV transformer-less single-phase inverters are preferable when the common mode leakage current satisfies the standard German DIN VDE 0126-1-1 [4].…”

Section: Introductionmentioning

confidence: 99%

Topology review of doubly grounded transformer‐less single‐phase inverters

Yao

2022

IET Power Electronics

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Photovoltaic (PV) transformer-less single-phase inverters are widely used in the solar generation systems because of low cost, high power density, and high efficiency. However, there is a common mode leakage current in the transformer-less inverters, which may endanger personal safety. In order to reduce the common mode leakage current, extra semiconductors should be added into the PV inverters to decouple the dc side from the ac side. However, the common mode leakage current is affected by the environmental condition and parameters of power devices. Since grounds of the PV array and the output terminal of the inverter are shorted, the common mode leakage current in the doubly grounded inverters can be eliminated thoroughly. Topologies of the doubly grounded inverters are reviewed in this paper, which can be divided into two categories, that is, hybrid topologies and topologies using energy storage elements. Derivation of the reviewed topologies is given. Different topologies of doubly grounded transformer-less single-phase inverters are compared.

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“…Mitigation of ground leakage current of single-phase PV inverter using hybrid PWM with soft voltage transition and nonlinear output inductor is proposed in [9]. Since it doesn't require a massive, pricey and low isolation transformer, transformerless full-bridge voltage source inverter is favoured in mitigation of ground leakage current of single-phase inverter using hybrid PWM.…”

Section: Introductionmentioning

confidence: 99%

H5-ZVR Single-Phase Grid-Tied Inverters for Photovoltaic Application

Geetha

Sreenivasappa

2021

IJRER

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The majority of companies are shifting to renewable energy sources as non-renewable fuels are increasingly depleting. Solar energy is a dependable form of green energy. The solar energy after converting to AC through an inverter it is possible to inject into the grid to support distributed power generation system. Transformerless grid-tied inverters have become popular due to their lightweight and reduced cost. The leakage current does exist in this kind of inverter that deteriorate the performance of the inverter. This paper presents a novel H5-ZVR, H5-ZVRD and H5-ZVRS topologies to address the leakage current issue. These inverters take the benefit of hybrid technology, where H5 inverters are integrated with HB-ZVR topologies. To operate the inverter at its highest performance an appropriate hybrid pulse width modulation is also presented. The inverters are simulated in MATLAB to verify the operation and it is found that the leakage current of the inverters is considerably reduced as compared to HB-ZVR topologies. The leakage current of H5-ZVR, H5-ZVRD and H5-ZVRS are found to be 10 mA, 7.3 mA and 7.3 mA respectively and THD of these modules are 1.03%, 0.91% and 0.91% respectively. Also, the topologies present good common mode and differential mode characteristics.

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Mitigation of Ground Leakage Current of Single-Phase PV Inverter Using Hybrid PWM With Soft Voltage Transition and Nonlinear Output Inductor

Cited by 22 publications

References 21 publications

A Hybrid Nearest Level Combined With PWM Control Strategy: Analysis and Implementation on Cascaded H-Bridge Multilevel Inverter and its Fault Tolerant Topology

A Hybrid Nearest Level Combined With PWM Control Strategy: Analysis and Implementation on Cascaded H-Bridge Multilevel Inverter and its Fault Tolerant Topology

Topology review of doubly grounded transformer‐less single‐phase inverters

H5-ZVR Single-Phase Grid-Tied Inverters for Photovoltaic Application

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