Analysis of the Modulation Strategy for the Minimization of the Leakage Current in the PV Grid-Connected Cascaded Multilevel Inverter

Sonti, Venu; Jain, Sachin; Bhattacharya, Subhashish

doi:10.1109/tpel.2016.2550206

Cited by 141 publications

(43 citation statements)

References 31 publications

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“…The power loss is the addition of switching losses and conduction losses. The switching losses and conduction losses can be calculated using the following formulas [18][19]…”

Section: Resultsmentioning

confidence: 99%

“…In Refs. [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], the configurations require bidirectional switches for achieving the desired output voltage level. Utilizing of bidirectional switches increases, the total count of switches in those configurations, because the combination of two unipolar switches makes one bidirectional switch using the concept of emitter coupled to both switches.…”

Section: Introductionmentioning

confidence: 99%

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A Reduced Switch Asymmetric Multilevel Inverter Topology Using Unipolar Pulse Width Modulation Strategies for Photovoltaic Application

Prabaharan¹,

Saravanan²,

Jerin³

et al. 2017

Recent Developments on Power Inverters

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A new design of multilevel inverter configuration is proposed for reducing the component count and improving the quality of waveform in a photovoltaic system. The proposed configuration operates at the binary asymmetric condition for generating the large amount output voltage level with small amount harmonic distortion. Unipolar trapezoidal reference with triangular carriers is used for generating the desired switching pulses to generate the required output voltage level. The proposed configuration requires eight unipolar switches for generating the 31-level output voltage level with total harmonic distortion of 3.18% without using any filters. The value of %total harmonic distortion (THD) satisfies the IEEE 519 harmonic standard. Separate DC sources of proposed configuration are replaced by the array of photovoltaic panels for testing the configuration with the renewable energy source. The proposed configuration is tested with an experimental setup for proving the operation of it. Selected simulation and experimental results are shown for the verification of proposed configuration ability.

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“…The power loss is the addition of switching losses and conduction losses. The switching losses and conduction losses can be calculated using the following formulas [18][19]…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Reduced Switch Asymmetric Multilevel Inverter Topology Using Unipolar Pulse Width Modulation Strategies for Photovoltaic Application

Prabaharan¹,

Saravanan²,

Jerin³

et al. 2017

Recent Developments on Power Inverters

View full text Add to dashboard Cite

show abstract

“…These stem from the high frequency common mode voltages introduced at the DC side of many inverter topologies (e.g. H-bridge), which cause leakage currents to flow through the significant panel-toground parasitic capacitances inherent in PV systems [10,11], as shown in Fig. 1a.…”

Section: B Photovoltaic System Configurationsmentioning

confidence: 99%

A New DC–DC Converter for Photovoltaic Systems: Coupled-Inductors Combined Cuk-SEPIC Converter

Nathan

Ghosh

Siwakoti

et al. 2019

IEEE Trans. Energy Convers.

157

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An enhanced DC-DC converter is proposed in this paper, based on the combination of the Cuk and SEPIC converters, which is well-suited for solar photovoltaic (PV) applications. The converter uses only one switch (which is ground-referenced, so simple gate drive circuitry may be used), yet provides dual outputs in the form of a bipolar DC bus. The bipolar output from the DC-DC converter is able to send power to the grid via any inverter with a unipolar or bipolar DC input, and leakage currents can be eliminated if the latter type is used without using lossy DC capacitors in the load current loop. The proposed converter uses integrated magnetics cores to couple the input and output inductors, which significantly reduces the input current ripple and hence greatly improves the power extracted from the solar PV system. The design methodology along with simulation, experimental waveforms, and efficiency measurements of a 4 kW DC-DC converter are presented to prove the concept of the proposed converter. Further, a 1 kW inverter is also developed to demonstrate the converter's grid-connection potential.

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“…To reduce the common-mode voltage (CMV), the novel modulation methods have been proposed [7][8][9][10][11][12][13][14]. An improved modulation with modified reference was proposed in [7]. Another modified modulation for reducing the CMV with specified vectors was proposed in [8].…”

Section: Introductionmentioning

confidence: 99%

A New Single-Phase Transformerless Current Source Inverter for Leakage Current Reduction

et al. 2018

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A new single-phase transformerless current source inverter is proposed in this paper. The proposed inverter can achieve leakage current reduction, which is crucial for the conventional current source inverter. The basic concept of the proposed solution is to develop the new inverter by the duality principle from the voltage source inverter. The theoretical analysis is carried out to determine the switching states of the proposed inverter for the leakage current reduction. Also, a new modulation strategy is presented to achieve the optimized switching states. Finally, the experimental results are presented. Comparing with conventional single-phase current source inverter, the leakage current can be significantly reduced by the proposed inverter, which verifies the effectiveness of the proposed solution.

show abstract

Analysis of the Modulation Strategy for the Minimization of the Leakage Current in the PV Grid-Connected Cascaded Multilevel Inverter

Cited by 141 publications

References 31 publications

A Reduced Switch Asymmetric Multilevel Inverter Topology Using Unipolar Pulse Width Modulation Strategies for Photovoltaic Application

A Reduced Switch Asymmetric Multilevel Inverter Topology Using Unipolar Pulse Width Modulation Strategies for Photovoltaic Application

A New DC–DC Converter for Photovoltaic Systems: Coupled-Inductors Combined Cuk-SEPIC Converter

A New Single-Phase Transformerless Current Source Inverter for Leakage Current Reduction

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