Analysis and Suppression of Leakage Current in Cascaded-Multilevel-Inverter-Based PV Systems

Zhou, Yan; Li, Hui

doi:10.1109/tpel.2013.2289939

Cited by 131 publications

(54 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Referring to the modeling methods and equivalent circuits in [13,22,23], a simplified three-phase equivalent circuit for the high-voltage side of the EPT illustrated in Figure 1b is exhibited in Figure 4. Note that the grid is converted equivalently to a star-connected voltage source for the analysis and calculation of CMV.…”

Section: The CMV At Neutral Pointmentioning

confidence: 99%

“…The literature [13] analyses systematically the CMV in the MV-ASD and establishes a common mode equivalent circuit, then suppresses the CMV by means of an improved modulation scheme. In the literature [22], the characteristics and paths of common mode current (CMI) in cascaded-multilevel-inverter-based photovoltaic system are analyzed, and suppression filters are designed. As for EPTs, related analysis of the CMV in the previously mentioned literature cannot be applied to them directly, due to their different topologies and control strategies.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Modeling and Analysis of the Common Mode Voltage in a Cascaded H-Bridge Electronic Power Transformer

Yang¹,

Mao²,

Wang³

et al. 2017

Energies

View full text Add to dashboard Cite

Electronic power transformers (EPTs) have been identified as emerging intelligent electronic devices in the future smart grid, e.g., the Energy Internet, especially in the application of renewable energy conversion and management. Considering that the EPT is directly connected to the medium-voltage grid, e.g., a10 kV distribution system, and its cascaded H-bridges structure, the common mode voltage (CMV) issue will be more complex and severe. The CMV will threaten the insulation of the entire EPT device and even produce common mode current. This paper investigates the generated mechanism and characteristics of the CMV in a cascaded H-bridge EPT (CHB-EPT) under both balanced and fault grid conditions. First, the CHB-EPT system is introduced. Then, a three-phase simplified circuit model of the high-voltage side of the EPT system is presented. Combined with a unipolar modulation strategy and carrier phase shifting technology by rigorous mathematical analysis and derivation, the EPT internal CMV and its characteristics are obtained. Moreover, the influence of the sinusoidal pulse width modulation dead time is considered and discussed based on analytical calculation. Finally, the simulation results are provided to verify the validity of the aforementioned model and the analysis results. The proposed theoretical analysis method is also suitable for other similar cascaded converters and can provide a useful theoretical guide for structural design and power density optimization.

show abstract

Section: The CMV At Neutral Pointmentioning

confidence: 99%

mentioning

confidence: 99%

Modeling and Analysis of the Common Mode Voltage in a Cascaded H-Bridge Electronic Power Transformer

Yang¹,

Mao²,

Wang³

et al. 2017

Energies

View full text Add to dashboard Cite

show abstract

“…Several multi-level inverter topologies designed for PV systems with reduction in leakage current and increase in number of the output-voltage levels have been proposed [4,5,6,7]. A modified H-bridge inverter in Fig.…”

Section: Introductionmentioning

confidence: 99%

Cost-effective 97%-efficiency charge-pump voltage balancer for multi-level PWM photovoltaic micro-inverter

Sundar

Park

et al. 2017

IEICE Electron. Express

View full text Add to dashboard Cite

In this paper, cost-effective high-efficiency photovoltaic (PV) power conditioning system (PCS) applicable for small-scale grid tied micro inverters usually under 400 W is proposed. The two-stage PCS consists of a modified H-bridge topology producing 5-level output and a boost converter magnetically-coupled with a secondary charge-pump circuit to provide charge balancing with isolation. Compared to the previous multi-level microinverter systems, the inverter circuit has reduced the part count, the DC-DC stage enables Maximum Power Point Tracking (MPPT) without powerconversion efficiency compromise during the voltage balancing operation at the neutral point of the DC-link capacitor for a low-cost 5-level photovoltaic inverter. Also, the voltage ratios are automatically maintained by the coupled-inductor turns ratio, thereby eliminating the additional control circuit for maintaining voltage balancing. Proposed micro-inverter topology is proved by the simulation and hardware prototype experiments.

show abstract

“…However, few papers have been reported regarding eliminating the leakage current for the singlephase cascaded multilevel inverters. A significant contribution by Zhou and Li is the filter-based leakage current suppression solution for the single-phase cascaded multilevel PV inverter [12]. But the topology-based solution is rarely discussed in literature, and needs further investigation.…”

Section: Introductionmentioning

confidence: 99%

Single phase cascaded H5 inverter with leakage current elimination for transformerless photovoltaic system

Guo

Jia

et al. 2016

2016 IEEE Applied Power Electronics Conference and Exposition (APEC)

View full text Add to dashboard Cite

Abstract-Leakage current reduction is one of the important issues for the transformelress PV systems. In this paper, the transformerless single-phase cascaded H-bridge PV inverter is investigated. The common mode model for the cascaded H4 inverter is analyzed. And the reason why the conventional cascade H4 inverter fails to reduce the leakage current is clarified. In order to solve the problem, a new cascaded H5 inverter is proposed to solve the leakage current issue. Finally, the experimental results are presented to verify the effectiveness of the proposed topology with the leakage current reduction for the singlephase transformerless PV systems.

show abstract

Analysis and Suppression of Leakage Current in Cascaded-Multilevel-Inverter-Based PV Systems

Cited by 131 publications

References 34 publications

Modeling and Analysis of the Common Mode Voltage in a Cascaded H-Bridge Electronic Power Transformer

Modeling and Analysis of the Common Mode Voltage in a Cascaded H-Bridge Electronic Power Transformer

Cost-effective 97%-efficiency charge-pump voltage balancer for multi-level PWM photovoltaic micro-inverter

Single phase cascaded H5 inverter with leakage current elimination for transformerless photovoltaic system

Contact Info

Product

Resources

About